public class RestDataSource extends DataSource
RestDataSource is named for the REST (REpresentational State Transfer) pattern, which in brief says that simple messages passed over HTTP is a sufficient protocol for many web applications, without the need for further protocols such as WSDL or SOAP.
A RestDataSource is used just like a normal DataSource. RestDataSources are pre-configured, using the general-purpose databinding facilities of DataSources, to expect a particular format for responses and to send requests in a specific format. These request and response formats represent Isomorphic's recommended best practices for binding Smart GWT to backends which do not already support a similar, pre-existing request and response format and where the Smart GWT Java Server cannot be used.
If you have a pre-existing REST or WSDL service which is difficult to change, consider
adapting Smart GWT to the existing service instead, by starting with a normal
DataSource and using the
client-side data integration facilities to create a
mapping between Smart GWT's DSRequest and DSResponse
objects and the message
formats of your existing services.
RestDataSource is typically used with PHP, Ruby, Python, Perl or custom server technologies,
and represents an alternative to installing the Smart GWT Server in a Java technology
stack, or using WSDL-based binding with .NET or other WSDL-capable
technologies. Note that Smart GWT Server also provides built-in support for the REST
protocol via its RESTHandler servlet; this is primarily to allow non-Smart GWT clients
to make use of DataSource operations. If you particularly wished to do so, you could use
RestDataSource to make a Smart GWT app talk to the Smart GWT Server using REST rather
than the proprietary wire format normally used when communicating with Smart GWT Server
(this is how we are able to write automated tests for the RESTHandler servlet). However,
doing this provides no benefit, imposes a number of inconveniences, and makes a handful
of server-based features less useful
(field-level declarative security,
for
example), so we strongly recommend that you do not do this; it is only mentioned
here for completeness while we are discussing REST.
The request and response formats used by the RestDataSource allow for many of the available
features of Smart GWT's databinding system to be used, including data paging, searching &
sorting, long transactions,
automatic cache sync, relogin and
queuing. However, advanced
features such as uploading / binary fields and
export aren't available with RestDataSource and need to be
re-implemented as needed. Most, though not all, server-based features
are still available when using RestDataSource, as long as you are also using the RESTHandler
servlet that is part of Smart GWT Server. However, as noted above, this approach is not
recommended; if you are using Isomorphic technology both client- and server-side, it makes
more sense to use the proprietary wire format.
RestDataSource and binary data
Binary data in a response provided to a RestDataSource must be delivered as valid XML or JSON Strings. Once delivered to the browser as Strings, there is no way to trigger the browser's "Save As" dialog to download the data, and in most cases no way to trigger other helper applications that might be launched to handle binary data (such as Excel or a PDF viewer). Hence for binary it usually makes sense to make a direct request via RPCManager.sendRequest() with downloadResult:true, separate from RestDataSource.
If you are using the Smart GWT Server included in Pro, Power end Enterprise to handle your
REST requests server-side, there is transparent support for conversion between Java
InputStreams representing binary data, and Strings containing that binary
data encoded using the Base64 algorithm.
Thus, on the server, the binary data is in its raw binary form, with transparent conversion
to or from Base64 for messages to or from the REST client.
Examples
XML formatted responses:
RestDataSource expects a response like the following in response to a "fetch" request:
<response>
<status>0</status>
<startRow>0</startRow>
<endRow>76</endRow>
<totalRows>546</totalRows>
<data>
<record>
<field1>value</field1>
<field2>value</field2>
</record>
<record>
<field1>value</field1>
<field2>value</field2>
</record>
... 76 total records ...
</data>
</response>
The <status> element indicates whether the fetch operation was successful
(see StatusCodes).
The <data> element contains a list of record nodes, each of which represents a record
returned by the server. The optional <startRow>, <endRow> and <totalRows>
elements are needed only if data paging is in use, and populate the
startRow, endRow and
totalRows properties of the DSResponse.
Note: for a more compact format, simple field values may be specified on record nodes directly as attributes - in this case a record element might be structured like this:
<record field1="value" field2="value" />
Note that a RestDataSource will bypass browser caching of all responses by default. See
preventHTTPCaching.
Successful "add" or "update" request responses are similar in format - in this case the data element would be expected to contain a single record object containing the details of the record, as saved on the server.
The response from a "remove" operation would again include status and data elements, but in this case, only the primary key field value(s) of the removed record would be expected to be present under the data element.
If a validation failure occurred on the server, the response would
have status set to STATUS_VALIDATION_ERROR
[-4],
and any validation errors could be included as per-field sub-elements of an "errors"
element. For a validation error, the response is not expected to contain any
<data> element.
A response showing a validation error might look like this:
<response>
<status>-4</status>
<errors>
<field1>
<errorMessage>A validation error occurred for this field</errorMessage>
</field1>
</errors>
</response>
An unrecoverable error, such as an unexpected server failure, can be flagged by setting
<status> to -1 and setting <data> to an error message. In this case the
<errors> element is not used (it's specific to validation errors). An unrecoverable
error causes all response processing to be skipped and RPCManager.handleError() to be
invoked, which by default will show the provided error message as an alert using
isc.warn().
JSON formatted responses:
JSON format responses are expected to contain the same data / meta-data as XMLresponses,
encapsulated in a simple object with a "response" attribute.
The response to a "fetch" request would therefore have this format:
{
"response": {
"status": 0,
"startRow": 0,
"endRow": 76,
"totalRows": 546,
"data": [
{"field1": "value", "field2": "value"},
{"field1": "value", "field2": "value"},
... 76 total records ...
]
}
}
The structure successful for "add", "update" and "remove" responses would be similar, though
the data array would be expected to contain only a single object, representing the values as
saved. This allows the server to return values such as an auto-generated sequence
primaryKey, a last modified timestamp, or similar server-generated field values.
For a remove, only the value for the primaryKey field[s] would be required.
For a validation error, the status attribute would be set to
STATUS_VALIDATION_ERROR [-4], and
errors would
be specified in the errors attribute of the response. For example:
{ "response":
{ "status": -4,
"errors":
{ "field1": {"errorMessage": "A validation error on field1"},
"field2": {"errorMessage": "A validation error on field2"}
}
}
}
An array of errors may also be returned for a single field, like this:
{ "response":
{ "status": -4,
"errors":
{ "field1": [
{"errorMessage": "First error on field1"},
{"errorMessage": "Second error on field1"}
]
}
}
}
As with the XML format above, an unrecoverable error is indicated by setting the
status attribute to -1 and the data property to the error message.
Server inbound data formats
The format of data sent to the server is determined by the dataProtocol
specified for the operation. Request data is sent as parameters if the format is
specified as "getParams" or "postParams".
In this case, the parameters sent to the server will consist of the DSRequest's data, and any
parameters explicitly specified on the DSRequest object (as params.
If sendMetaData is true, the DSRequest meta
data properties will also be present as parameters, prefixed with
metaDataPrefix.
Example URL constructed with the metaDataPrefix set to "_" (the default):
[dataURL]?field1=value1&_operationType=fetch&_startRow=0&_endRow=50&_sortBy=-field2&_dataSource=dsName
In this case the server would be able to separate the request's data from the meta data
via the "_" prefix.
If data is sent to the server via the "postMessage" dataProtocol, the data will
be serialized as an XML or JSON message according to the dataFormat setting.
Both XML and JSON messages will contain request metadata such as startRow and endRow, and
will appear exactly as though the subset of the DSRequest that is meaningful to the
server had been passed to DataSource.xmlSerialize() or JSON.encode()
respectively.
An example of an XML message might look like this:
<request>
<data>
<countryCode>US</countryCode>
<countryName>Edited Value</countryName>
<capital>Edited Value</capital>
<continent>Edited Value</continent>
</data>
<dataSource>countryDS</dataSource>
<operationType>update</operationType>
</request>
An example of an XML message for a fetch operation passing simple criteria:
<request>
<data>
<continent>North America</continent>
</data>
<dataSource>countryDS</dataSource>
<operationType>fetch</operationType>
<startRow>0</startRow>
<endRow>75</endRow>
<componentId>worldGrid</componentId>
<textMatchStyle>exact</textMatchStyle>
</request>
And an example of an XML message for a fetch operation passing AdvancedCriteria:
<request>
<data>
<_constructor>AdvancedCriteria</_constructor>
<operator>or</operator>
<criteria>
<criterion>
<fieldName>continent</fieldName>
<operator>equals</operator>
<value>North America</value>
</criterion>
<criterion>
<operator>and</operator>
<criteria>
<criterion>
<fieldName>continent</fieldName>
<operator>equals</operator>
<value>Europe</value>
</criterion>
<criterion>
<fieldName>population</fieldName>
<operator>greaterThan</operator>
<value>50000000</value>
</criterion>
</criteria>
</criterion>
</criteria>
</data>
<dataSource>countryDS</dataSource>
<operationType>fetch</operationType>
<startRow>0</startRow>
<endRow>75</endRow>
<componentId>worldGrid</componentId>
</request>
An example of an XML message for a fetch operation when using server-side summaries:
<request>
<data></data>
<dataSource>countryDS</dataSource>
<operationType>fetch</operationType>
<summaryFunctions>
<pk>count</pk>
</summaryFunctions>
<groupBy>member_g8</groupBy>
</request>
JSON messages are just the plain JSON form of the structures shown in the above XML
examples. The advanced criteria XML example above but in JSON form:
{
data: {
_constructor: "AdvancedCriteria",
operator: "or",
criteria: [
{
fieldName: "continent",
operator: "equals",
value: "North America
},
{
operator: "and", criteria: [
{
fieldName: "continent",
operator: "equals",
value: "Europe"
},
{
fieldName: "population",
operator: "greaterThan",
value: 50000000
}
]
}
]
}
dataSource: "countryDS",
operationType: "fetch",
startRow: 0,
endRow: 75,
componentId: "worldGrid"
}
The default OperationBindings for a RestDataSource
specify dataProtocol as "getParams" for the fetch operation, and "postParams" for update,
add and remove operations. Note that most webservers impose a limit on the maximum size
of GET requests (specifically, on the size of the request URL + HTTP headers). Using
dataProtocol:"getParams" for "fetch" operations that involve complex AdvancedCriteria
will result in a JSON serialization of the AdvancedCriteria in the request URL, and when
combined with large cookies this can easily overflow the default limits on certain
webservers (see
http://stackoverflow.com/questions/686217/maximum-on-http-header-values).
For this reason, we recommend that you use the "postMessage" protocol whenever you are
intending to use AdvancedCriteria with RestDataSource.
Date, time and datetime values
Date, time and datetime values must be communicated using XML Schema format, as in the following examples:
<dateField>2007-04-22</dateField> <timeField>11:07:13</timeField> <dateTimeField>2007-04-22T11:07:13</dateTimeField> <dateTimeField>2007-04-22T11:07:13.582</dateTimeField>
And the equivalent in JSON:
dateField: "2007-04-22" timeField: "11:07:13" dateTimeField: "2007-04-22T11:07:13" dateTimeField: "2007-04-22T11:07:13.582"
Both RestDataSource on the client-side and the RESTHandler servlet on the server side
automatically handle encoding and decoding temporal values using these formats. Both also
handle datetime formats including or excluding milliseconds automatically. When encoding,
both honot the trimMilliseconds setting on the
DataSource, falling back
to the server.properties setting rest.trimMilliseconds; when
decoding, both detect whether or not to try to parse milliseconds based on the string they
receive.
Fields of type "date" and "time" are considered to hold logical date and time values, as
discussed in the date and time handling article, and are
not affected by timezones. Fields of type "datetime" will be converted to UTC on the
client side by RestDataSource, and will be sent back down to the client as UTC by the
server-side RESTHandler. We recommend that your own REST client and/or server code do the
same thing (ie, transmit all datetime values in both directions as UTC). Note that the
examples given above give no timezone information, and will be treated by the Smart GWT
Server as UTC values. If you wish to work with datetime values in a particular timezone,
use a format like this:
<dateField>2007-04-22T11:07:13-0800</dateField> <dateField>2012-11-19T22:12:04+0100</dateField>
And the equivalent in JSON:
dateTimeField: "2007-04-22T11:07:13-0800"
dateTimeField: "2012-11-19T22:12:04+0100"
NOTE: Although we refer above to XML Schema format, the format used for specifying timezone offset is slightly different from XML Schema - as shown in the above examples, you specify "+HHMM" or "-HHMM", as opposed to the XML Schema format which requires a ":" character between the hours and minutes. The reason for this difference is simply that the Java SimpleDateFormat class imposes it.
RestDataSource queuing support
RestDataSource supports queuing of DSRequests. This allows
you to send multiple requests to the server in a single HTTP turnaround, thus minimizing
network traffic and allowing the server to treat multiple requests as a single transaction,
if the server is able to do so (in Power Edition and above, the Smart GWT Server
transparently supports grouping multiple REST requests in a queue into a single database
transaction when using one of the built-in DataSource types). Note that you can disable
queuing support with the disableQueuing flag.
If you want to use queuing with RestDataSource, you must use the "postMessage" dataProtocol with either XML or JSON dataFormat. Message format is similar to the non-queued examples shown earlier: it is simply extended to cope with the idea of multiple DSRequests encapsulated in the message.
An example of the XML message sent from RestDataSource to the server for two update requests combined into a queue, using XML dataFormat:
<transaction>
<operations>
<request>
<data>
<pk>1</pk>
<countryName>Edited Value</countryName>
<capital>Edited Value</capital>
<continent>Edited Value</continent>
</data>
<dataSource>countryDS</dataSource>
<operationType>update</operationType>
</request>
<request>
<data>
<pk>2</pk>
<capital>Edited Value</capital>
<population>123456</population>
</data>
<dataSource>countryDS</dataSource>
<operationType>update</operationType>
</request>
</operations>
<transaction>
And the same message in JSON format:
{
transaction: {
operations: [{
dataSource:"countryDS",
operationType:"update",
data: {
pk: 1
countryName: "Edited Value",
capital: "Edited Value",
continent: "Edited Value"
}
}, {
dataSource:"countryDS",
operationType:"update",
data: {
pk: 2,
capital: "Edited Value",
popuilation: 123456
}
}]
}
}
RestDataSource expects the response to a queue of requests to be a queue of responses in
the same order as the original requests. Again, the message format is very similar to the
unqueued REST format, it just has an outer container construct. Note also that the
individual DSResponses in a queued response have an extra property,
queueStatusstatus of 0, but a queueStatus of -1, while the second response
would have both properties set to -1.
The update queue example given above would expect a response like this (in XML):
<responses>
<response>
<status>0</status>
<queueStatus>0</queueStatus>
<data>
<record>
<countryName>Edited Value</countryName>
<gdp>1700.0</gdp>
<continent>Edited Value</continent>
<capital>Edited Value</capital>
<pk>1</pk>
</record>
</data>
</response>
<response>
<status>0</status>
<queueStatus>0</queueStatus>
<data>
<record>
<countryName>United States</countryName>
<gdp>7247700.0</gdp>
<continent>North America</continent>
<independence>1776-07-04</independence>
<capital>Washington DC</capital>
<pk>2</pk>
<population>123456</population>
</record>
</data>
</response>
</responses>
And in JSON:
[
{
"response": {
"queueStatus": 0,
"status": 0,
"data": [{
"countryName": "Edited Value",
"gdp": 1700.0,
"continent": "Edited Value",
"capital": "Edited Value",
"pk": 1
}]
}
},
{
"response": {
"queueStatus": 0,
"status": 0,
"data": [{
"countryName": "United States",
"gdp": 7247700.0,
"continent": "North America",
"independence": "1776-07-04",
"capital": "Washington DC",
"pk": 2,
"population": 123456
}]
}
}
]
Hierarchical (Tree) data:
To create a hierarchical DataSource, in the DataSource's fields array, a field
must be specified as the parent id field - the field which will contain a pointer to the
id of each node's parent.
This can be achieved by setting the foreignKey and the
rootValue attributes on the field definition. For example:
RestDataSource.create({
ID:"supplyItem",
fields : [
{name:"itemId", type:"sequence", primaryKey:true},
{name:"parentId", type:"integer", foreignKey:"supplyItem.itemId", rootValue:0},
...
]
});
Tree Data is then treated on the server as a flat list of records linked by parent id.
Tree data is typically displayed using a dataBound TreeGrid component.
TreeGrids
automatically create a ResultTree data object, which requests data directly
from the DataSource. ResultTrees load data on demand, only requesting currently visible
(open) nodes from the server. This is handled by including a specified value for the parent
id field in the request criteria.
To implement a standard load-on-demand tree RestDataSource back end, you should therefore
simply return the set of nodes that match the criteria passed in.
For example, if your DataSource was defined as the "supplyItem" code snippet above,
a fetch request for all children of a node with itemId set to 12
would have "parentId" set to 12 in the request criteria.
A valid response would then contain all the records that matched this criteria. For example:
<response>
<status>0</status>
<data>
<record>
<itemId>15</itemId>
<parentId>12</parentId>
</record>
<record>
<itemId>16</itemId>
<parentId>12</parentId>
</record>
</data>
</response>
The structure of responses for Add, Update and Delete type requests will be the
same regardless of whether the data is hierarchical. However you should be aware that
the underlying data storage may need to be managed slightly differently in some cases.
Specifically, Add and Update operations may change the structure of the tree by returning a new parent id field value for the modified node. Depending on how your data is stored you may need to include special back-end logic to handle this.
Also, if a user deletes a folder within a databound tree, any children of that folder will also be dropped from the tree, and can be removed from the back-end data storage.
Note: For a general overview of binding components to Tree structured data, see
Tree Databinding.
config, id, scClassName| Constructor and Description |
|---|
RestDataSource() |
RestDataSource(com.google.gwt.core.client.JavaScriptObject jsObj) |
| Modifier and Type | Method and Description |
|---|---|
com.google.gwt.core.client.JavaScriptObject |
create() |
java.lang.String |
getAddDataURL()
Custom dataURL for add type operations
|
DSDataFormat |
getDataFormat()
Expected format for server responses.
|
DSProtocol |
getDataProtocol()
Rather than setting
dataProtocol, to control the format in
which inputs are sent to the dataURL, you must specify a replacement OperationBinding
and specify dataProtocol on that
operationBinding. |
java.lang.String |
getDataURL()
Default URL to contact to fulfill all DSRequests.
|
java.lang.Boolean |
getDisableQueuing()
If set, disables
request queuing for this RestDataSource. |
java.lang.String |
getFetchDataURL()
Custom dataURL for fetch type operations
|
java.lang.String |
getJsonPrefix()
Allows you to specify an arbitrary prefix string to apply to all json format responses sent from the server to this
application.
|
java.lang.String |
getJsonRecordXPath()
recordXPath mapping to the data node of json returned by the server. |
java.lang.String |
getJsonSuffix()
Allows you to specify an arbitrary suffix string to apply to all json format responses sent from the server to this
application.
|
java.lang.String |
getMetaDataPrefix()
If
sendMetaData is true, this attribute is used to
specify the prefix to apply to 'meta data' properties when assembling parameters to send to the server. |
OperationBinding[] |
getOperationBindings()
RestDataSource OperationBindings set to specify default dataProtocol per operationType.
|
static RestDataSource |
getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj) |
java.lang.Boolean |
getPrettyPrintJSON()
When using dataFormat:"json" and dataProtocol:"postMessage" should we use the
prettyPrint feature to enable indented, highly readable JSON
messages. |
java.lang.String |
getRecordXPath()
For RestDataSources, by default, either the
xmlRecordXPath or jsonRecordXPath is used based on
the dataFormat setting. |
java.lang.String |
getRemoveDataURL()
Custom dataURL for remove type operations
|
java.lang.Boolean |
getSendMetaData()
Should operation meta data be included when assembling parameters to send to the server? If true, meta data parameters
will be prefixed with the
metaDataPrefix.Applies to operations where OperationBinding.dataProtocol is set to "getParams" or "postParams" only. |
java.lang.String |
getUpdateDataURL()
Custom dataURL for update type operations
|
XmlNamespaces |
getXmlNamespaces()
When
dataFormat is "xml", xmlNamespaces
configures the set of namespace prefixes that are added to the document element of the XML message sent to the server. |
java.lang.String |
getXmlRecordXPath()
recordXPath mapping to the data node of XML returned by the server. |
void |
setAddDataURL(java.lang.String addDataURL)
Custom dataURL for add type operations
|
void |
setDataFormat(DSDataFormat dataFormat)
Expected format for server responses.
|
void |
setDataProtocol(DSProtocol dataProtocol)
Rather than setting
dataProtocol, to control the format in
which inputs are sent to the dataURL, you must specify a replacement OperationBinding
and specify dataProtocol on that
operationBinding. |
void |
setDataURL(java.lang.String dataURL)
Default URL to contact to fulfill all DSRequests.
|
void |
setDisableQueuing(java.lang.Boolean disableQueuing)
If set, disables
request queuing for this RestDataSource. |
void |
setFetchDataURL(java.lang.String fetchDataURL)
Custom dataURL for fetch type operations
|
void |
setJsonPrefix(java.lang.String jsonPrefix)
Allows you to specify an arbitrary prefix string to apply to all json format responses sent from the server to this
application.
|
void |
setJsonRecordXPath(java.lang.String jsonRecordXPath)
recordXPath mapping to the data node of json returned by the server. |
void |
setJsonSuffix(java.lang.String jsonSuffix)
Allows you to specify an arbitrary suffix string to apply to all json format responses sent from the server to this
application.
|
void |
setMetaDataPrefix(java.lang.String metaDataPrefix)
If
sendMetaData is true, this attribute is used to
specify the prefix to apply to 'meta data' properties when assembling parameters to send to the server. |
void |
setOperationBindings(OperationBinding... operationBindings)
RestDataSource OperationBindings set to specify default dataProtocol per operationType.
|
void |
setPrettyPrintJSON(java.lang.Boolean prettyPrintJSON)
When using dataFormat:"json" and dataProtocol:"postMessage" should we use the
prettyPrint feature to enable indented, highly readable JSON
messages. |
void |
setRecordXPath(java.lang.String recordXPath)
For RestDataSources, by default, either the
xmlRecordXPath or jsonRecordXPath is used based on
the dataFormat setting. |
void |
setRemoveDataURL(java.lang.String removeDataURL)
Custom dataURL for remove type operations
|
void |
setSendMetaData(java.lang.Boolean sendMetaData)
Should operation meta data be included when assembling parameters to send to the server? If true, meta data parameters
will be prefixed with the
metaDataPrefix.Applies to operations where OperationBinding.dataProtocol is set to "getParams" or "postParams" only. |
void |
setUpdateDataURL(java.lang.String updateDataURL)
Custom dataURL for update type operations
|
void |
setXmlNamespaces(XmlNamespaces xmlNamespaces)
When
dataFormat is "xml", xmlNamespaces
configures the set of namespace prefixes that are added to the document element of the XML message sent to the server. |
void |
setXmlRecordXPath(java.lang.String xmlRecordXPath)
recordXPath mapping to the data node of XML returned by the server. |
addData, addData, addData, addField, addHandleErrorHandler, applyFilter, applyFilter, canFlattenCriteria, combineCriteria, combineCriteria, combineCriteria, compareCriteria, compareCriteria, compareCriteria, compareDates, convertCriteria, convertCriteria, convertDataSourceCriteria, convertDataSourceCriteria, convertRelativeDates, convertRelativeDates, convertRelativeDates, convertRelativeDates, copyCriteria, copyRecord, copyRecords, downloadFile, downloadFile, downloadFile, evaluateCriterion, exportClientData, exportClientDataStatic, exportData, exportData, exportData, exportData, fetchData, fetchData, fetchData, fetchData, fetchRecord, fetchRecord, fetchRecord, fieldMatchesFilter, fieldMatchesFilter, filterData, filterData, filterData, filterData, flattenCriteria, get, get, getAddGlobalId, getAdvancedCriteriaDescription, getAllowAdvancedCriteria, getAutoCacheAllData, getAutoConvertRelativeDates, getAutoDeriveTitles, getAutoTitle, getCacheAcrossOperationIds, getCacheAllData, getCacheAllOperationId, getCacheData, getCacheMaxAge, getCallbackParam, getCanMultiSort, getChildrenField, getClientOnly, getClientOnlyDataSource, getClientOnlyDataSource, getClientOnlyDataSource, getClientOnlyResponse, getCriteriaPolicy, getDataField, getDataSource, getDataSource, getDataTransport, getDefaultParams, getDefaultTextMatchStyle, getDescriptionField, getDisplayValue, getDropExtraFields, getDropUnknownCriteria, getFetchDataURL, getFetchDataURL, getField, getFieldAutoTitle, getFieldCriterion, getFieldForDataPath, getFieldNames, getFieldNames, getFieldOperators, getFieldOperators, getFields, getFieldValue, getFieldValue, getFieldValue, getFieldValue, getFileURL, getFileURL, getFileURL, getGlobalNamespaces, getIconField, getIgnoreTextMatchStyleCaseSensitive, getInfoField, getInheritsFrom, getJsObj, getLegalChildTags, getLoaderURL, getPatternEscapeChar, getPatternMultiWildcard, getPatternMultiWildcardAsString, getPatternSingleWildcard, getPatternSingleWildcardAsString, getPluralTitle, getPreventHTTPCaching, getPrimaryKeyField, getPrimaryKeyFieldName, getPrimaryKeyFieldNames, getPrimaryKeyFields, getProgressiveLoading, getQualifyColumnNames, getRequestProperties, getRequiredMessage, getResultBatchSize, getResultSetClass, getSchemaNamespace, getSendExtraFields, getSendParentNode, getServiceNamespace, getShowLocalFieldsOnly, getShowPrompt, getSortBy, getSortSpecifiers, getStrictSQLFiltering, getTagName, getTestData, getTitle, getTitleField, getTranslatePatternOperators, getTrimMilliseconds, getTypeOperators, getTypeOperators, getUseFlatFields, getUseHttpProxy, getUseLocalValidators, getUseOfflineStorage, getUseParentFieldOrder, getUseStrictJSON, getUseTestDataFetch, getValidateRelatedRecords, hasAllData, invalidateCache, isCreated, isFlatCriteria, load, load, load, loadWithParents, loadWithParents, loadWithParents, onInit, performCustomOperation, performCustomOperation, performCustomOperation, performCustomOperation, processResponse, recordsAreEqual, recordsAsText, recordsAsText, recordsFromText, recordsFromText, recordsFromXML, registerID, removeData, removeData, removeData, setAddGlobalId, setAllowAdvancedCriteria, setAutoCacheAllData, setAutoConvertRelativeDates, setAutoDeriveTitles, setCacheAcrossOperationIds, setCacheAllData, setCacheAllOperationId, setCacheData, setCacheMaxAge, setCallbackParam, setCanMultiSort, setChildrenField, setClientOnly, setCriteriaPolicy, setDataField, setDataTransport, setDefaultParams, setDefaultTextMatchStyle, setDescriptionField, setDropExtraFields, setDropUnknownCriteria, setEnumConstantProperty, setEnumOrdinalProperty, setEnumTranslateStrategy, setFields, setGlobalNamespaces, setHandleErrorCallback, setIconField, setID, setIgnoreTextMatchStyleCaseSensitive, setInfoField, setInheritsFrom, setInheritsFrom, setLoaderURL, setPatternEscapeChar, setPatternMultiWildcard, setPatternMultiWildcard, setPatternSingleWildcard, setPatternSingleWildcard, setPluralTitle, setPreventHTTPCaching, setProgressiveLoading, setQualifyColumnNames, setRecordName, setRequestProperties, setRequiredMessage, setResultBatchSize, setResultSetClass, setSendExtraFields, setSendParentNode, setServiceNamespace, setShowLocalFieldsOnly, setShowPrompt, setStrictSQLFiltering, setTagName, setTestData, setTitle, setTitleField, setTranslatePatternOperators, setTrimMilliseconds, setTypeOperators, setTypeOperators, setUseFlatFields, setUseHttpProxy, setUseLocalValidators, setUseOfflineStorage, setUseParentFieldOrder, setUseStrictJSON, setUseTestDataFetch, setValidateRelatedRecords, splitCriteria, supportsAdvancedCriteria, supportsTextMatchStyle, transformRequest, transformResponse, updateCaches, updateCaches, updateData, updateData, updateData, useOfflineResponse, validateData, validateData, validateData, viewFile, viewFile, viewFile, xmlSerialize, xmlSerialize, xmlSerialize, xmlSerialize, xmlSerializeasSGWTComponent, createJsObj, destroy, doAddHandler, doInit, error, error, errorIfNotCreated, fireEvent, getAttribute, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDouble, getAttributeAsElement, getAttributeAsFloat, getAttributeAsInt, getAttributeAsJavaScriptObject, getAttributeAsMap, getAttributeAsString, getAttributeAsStringArray, getClassName, getConfig, getHandlerCount, getID, getOrCreateJsObj, getRef, getScClassName, hasAutoAssignedID, internalSetID, internalSetID, onBind, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setConfig, setJavaScriptObject, setProperty, setProperty, setProperty, setProperty, setScClassNamepublic RestDataSource()
public RestDataSource(com.google.gwt.core.client.JavaScriptObject jsObj)
public static RestDataSource getOrCreateRef(com.google.gwt.core.client.JavaScriptObject jsObj)
public com.google.gwt.core.client.JavaScriptObject create()
create in class DataSourcepublic void setAddDataURL(java.lang.String addDataURL)
throws java.lang.IllegalStateException
addDataURL - Default value is nulljava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.String getAddDataURL()
public void setDataFormat(DSDataFormat dataFormat) throws java.lang.IllegalStateException
"json" and "xml" format responses
by default. See class overview documentation for examples of responses in each format.setDataFormat in class DataSourcedataFormat - Default value is "xml"java.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdClientDataIntegration overview and related methods,
JSON DataSource Example,
Simple JSON Examplepublic DSDataFormat getDataFormat()
"json" and "xml" format responses
by default. See class overview documentation for examples of responses in each format.getDataFormat in class DataSourceClientDataIntegration overview and related methods,
JSON DataSource Example,
Simple JSON Examplepublic void setDataProtocol(DSProtocol dataProtocol) throws java.lang.IllegalStateException
dataProtocol, to control the format in
which inputs are sent to the dataURL, you must specify a replacement OperationBinding
and specify dataProtocol on that
operationBinding. This is because RestDataSource specifies default
operationBindings for all operationTypes - see operationBindings.
setDataProtocol in class DataSourcedataProtocol - Default value is nulljava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdClientDataIntegration overview and related methodspublic DSProtocol getDataProtocol()
dataProtocol, to control the format in
which inputs are sent to the dataURL, you must specify a replacement OperationBinding
and specify dataProtocol on that
operationBinding. This is because RestDataSource specifies default
operationBindings for all operationTypes - see operationBindings.
getDataProtocol in class DataSourceClientDataIntegration overview and related methodspublic void setDataURL(java.lang.String dataURL)
throws java.lang.IllegalStateException
setDataURL in class DataSourcedataURL - Default value is nulljava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdClientDataIntegration overview and related methods,
JSON DataSource Examplepublic java.lang.String getDataURL()
getDataURL in class DataSourceClientDataIntegration overview and related methods,
JSON DataSource Examplepublic void setDisableQueuing(java.lang.Boolean disableQueuing)
request queuing for this RestDataSource.disableQueuing - Default value is falsepublic java.lang.Boolean getDisableQueuing()
request queuing for this RestDataSource.public void setFetchDataURL(java.lang.String fetchDataURL)
throws java.lang.IllegalStateException
fetchDataURL - Default value is nulljava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.String getFetchDataURL()
public void setJsonPrefix(java.lang.String jsonPrefix)
The default prefix is "<SCRIPT>//'\"]]>>isc_JSONResponseStart>>".
The inclusion of such a prefix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.
You can switch off JSON
wrapping altogether by setting both this and jsonSuffix to
empty strings.
If you are using Smart GWT Server's RESTHandler servlet, see the server-side Javadocs for details of how to change the way JSON wrapping works on the server side.
setJsonPrefix in class DataSourcejsonPrefix - Default value is See belowsetJsonSuffix(java.lang.String)public java.lang.String getJsonPrefix()
The default prefix is "<SCRIPT>//'\"]]>>isc_JSONResponseStart>>".
The inclusion of such a prefix ensures your code is not directly executable outside of your application, as a preventative measure against javascript hijacking.
You can switch off JSON
wrapping altogether by setting both this and jsonSuffix to
empty strings.
If you are using Smart GWT Server's RESTHandler servlet, see the server-side Javadocs for details of how to change the way JSON wrapping works on the server side.
getJsonPrefix in class DataSourcegetJsonSuffix()public void setJsonRecordXPath(java.lang.String jsonRecordXPath)
throws java.lang.IllegalStateException
recordXPath mapping to the data node of json returned by the server.
Applies if this.dataFormat is set to "json"
{response:
{status:0,
data:[
{field1:"value", field2:"value"},
{field1:"value", field2:"value"}
]
}
jsonRecordXPath - Default value is "/response/data"java.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.String getJsonRecordXPath()
recordXPath mapping to the data node of json returned by the server.
Applies if this.dataFormat is set to "json"
{response:
{status:0,
data:[
{field1:"value", field2:"value"},
{field1:"value", field2:"value"}
]
}
public void setJsonSuffix(java.lang.String jsonSuffix)
The default suffix is "//isc_JSONResponseEnd".
setJsonSuffix in class DataSourcejsonSuffix - Default value is See belowsetJsonPrefix(java.lang.String)public java.lang.String getJsonSuffix()
The default suffix is "//isc_JSONResponseEnd".
getJsonSuffix in class DataSourcegetJsonPrefix()public void setMetaDataPrefix(java.lang.String metaDataPrefix)
throws java.lang.IllegalStateException
sendMetaData is true, this attribute is used to
specify the prefix to apply to 'meta data' properties when assembling parameters to send to the server. Applies to
operations where OperationBinding.dataProtocol is set to "getParams" or "postParams" only.metaDataPrefix - Default value is "_"java.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.String getMetaDataPrefix()
sendMetaData is true, this attribute is used to
specify the prefix to apply to 'meta data' properties when assembling parameters to send to the server. Applies to
operations where OperationBinding.dataProtocol is set to "getParams" or "postParams" only.public void setOperationBindings(OperationBinding... operationBindings) throws java.lang.IllegalStateException
operationBindings : [
{operationType:"fetch", dataProtocol:"getParams"},
{operationType:"add", dataProtocol:"postParams"},
{operationType:"remove", dataProtocol:"postParams"},
{operationType:"update", dataProtocol:"postParams"}
],
If you are integrating with a REST server that requires the more
obscure httpMethods of "PUT", "DELETE" or "HEAD", you can
specify these
httpMethod settings via requestProperties.
dataProtocol settings
that mention "GET" or "POST" are compatible with these additional HTTP methods as well.
Typical operationBindings for a REST server that uses
"PUT" and "DELETE" are as follows:
operationBindings:[
{operationType:"fetch", dataProtocol:"getParams"},
{operationType:"add", dataProtocol:"postParams"},
{operationType:"remove", dataProtocol:"getParams", requestProperties:{httpMethod:"DELETE"}},
{operationType:"update", dataProtocol:"postParams", requestProperties:{httpMethod:"PUT"}}
],
Note that dataProtocol:"postMessage" is always used when
queuing is used to send multiple DSRequests to the server
as a single HttpRequest. See RestDataSource docs, "queuing support". We also
recommend that you use the "postMessage" protocol whenever you are intending to use
AdvancedCriteria with RestDataSource - this is discussed in the section "Server inbound
data format" in the RestDataSource overview.
setOperationBindings in class DataSourceoperationBindings - Default value is [...]java.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdOperationBindingpublic OperationBinding[] getOperationBindings()
operationBindings : [
{operationType:"fetch", dataProtocol:"getParams"},
{operationType:"add", dataProtocol:"postParams"},
{operationType:"remove", dataProtocol:"postParams"},
{operationType:"update", dataProtocol:"postParams"}
],
If you are integrating with a REST server that requires the more
obscure httpMethods of "PUT", "DELETE" or "HEAD", you can
specify these
httpMethod settings via requestProperties.
dataProtocol settings
that mention "GET" or "POST" are compatible with these additional HTTP methods as well.
Typical operationBindings for a REST server that uses
"PUT" and "DELETE" are as follows:
operationBindings:[
{operationType:"fetch", dataProtocol:"getParams"},
{operationType:"add", dataProtocol:"postParams"},
{operationType:"remove", dataProtocol:"getParams", requestProperties:{httpMethod:"DELETE"}},
{operationType:"update", dataProtocol:"postParams", requestProperties:{httpMethod:"PUT"}}
],
Note that dataProtocol:"postMessage" is always used when
queuing is used to send multiple DSRequests to the server
as a single HttpRequest. See RestDataSource docs, "queuing support". We also
recommend that you use the "postMessage" protocol whenever you are intending to use
AdvancedCriteria with RestDataSource - this is discussed in the section "Server inbound
data format" in the RestDataSource overview.
getOperationBindings in class DataSourceOperationBindingpublic void setPrettyPrintJSON(java.lang.Boolean prettyPrintJSON)
throws java.lang.IllegalStateException
prettyPrint feature to enable indented, highly readable JSON
messages. True by default because the bandwidth involved is generally negligible and the benefits for troubleshooting are key.
prettyPrintJSON - Default value is truejava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.Boolean getPrettyPrintJSON()
prettyPrint feature to enable indented, highly readable JSON
messages. True by default because the bandwidth involved is generally negligible and the benefits for troubleshooting are key.
public void setRecordXPath(java.lang.String recordXPath)
xmlRecordXPath or jsonRecordXPath is used based on
the dataFormat setting. Note that you can also apply
record xpath binding via recordXPath.
setRecordXPath in class DataSourcerecordXPath - Default value is nullClientDataIntegration overview and related methods,
XML DataSource Example,
JSON XPath Binding Examplepublic java.lang.String getRecordXPath()
xmlRecordXPath or jsonRecordXPath is used based on
the dataFormat setting. Note that you can also apply
record xpath binding via recordXPath.
getRecordXPath in class DataSourceClientDataIntegration overview and related methods,
XML DataSource Example,
JSON XPath Binding Examplepublic void setRemoveDataURL(java.lang.String removeDataURL)
throws java.lang.IllegalStateException
removeDataURL - Default value is nulljava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.String getRemoveDataURL()
public void setSendMetaData(java.lang.Boolean sendMetaData)
throws java.lang.IllegalStateException
metaDataPrefix."getParams" or "postParams" only.sendMetaData - Default value is truejava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.Boolean getSendMetaData()
metaDataPrefix."getParams" or "postParams" only.public void setUpdateDataURL(java.lang.String updateDataURL)
throws java.lang.IllegalStateException
updateDataURL - Default value is nulljava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.String getUpdateDataURL()
public void setXmlNamespaces(XmlNamespaces xmlNamespaces) throws java.lang.IllegalStateException
dataFormat is "xml", xmlNamespaces
configures the set of namespace prefixes that are added to the document element of the XML message sent to the server.
Format is the same as xmlNamespaces. By default, the
"xsi" prefix is bound to "http://www.w3.org/2001/XMLSchema-instance" in order to allow explicit null values in Records
to be sent for fields declared nillable. Set to null to
avoid any prefixes being added.
setXmlNamespaces in class DataSourcexmlNamespaces - Default value is See belowjava.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdDataSourceField.setNillable(java.lang.Boolean)public XmlNamespaces getXmlNamespaces()
dataFormat is "xml", xmlNamespaces
configures the set of namespace prefixes that are added to the document element of the XML message sent to the server.
Format is the same as xmlNamespaces. By default, the
"xsi" prefix is bound to "http://www.w3.org/2001/XMLSchema-instance" in order to allow explicit null values in Records
to be sent for fields declared nillable. Set to null to
avoid any prefixes being added.
DataSourceField.getNillable()public void setXmlRecordXPath(java.lang.String xmlRecordXPath)
throws java.lang.IllegalStateException
recordXPath mapping to the data node of XML returned by the server.
Applies if this.dataFormat is set to "xml".
<response>
<status>0</status>
<data>
<record>
<field1>value</field1>
<field2>value</field2>
</record>
<record>
<field1>value</field1>
<field2>value</field2>
</record>
</data>
</response>
xmlRecordXPath - Default value is "/response/data/*"java.lang.IllegalStateException - this property cannot be changed after the underlying component has been createdpublic java.lang.String getXmlRecordXPath()
recordXPath mapping to the data node of XML returned by the server.
Applies if this.dataFormat is set to "xml".
<response>
<status>0</status>
<data>
<record>
<field1>value</field1>
<field2>value</field2>
</record>
<record>
<field1>value</field1>
<field2>value</field2>
</record>
</data>
</response>