net.sf.jasperreports.engine.data
Class JsonDataSource

java.lang.Object
  net.sf.jasperreports.engine.data.JRAbstractTextDataSource
      net.sf.jasperreports.engine.data.JsonDataSource

All Implemented Interfaces:

JRDataSource, JRRewindableDataSource

public class JsonDataSource
extends JRAbstractTextDataSource
implements JRRewindableDataSource

JSON data source implementation

Version:

$Id: JsonDataSource.java 5346 2012-05-08 12:08:01Z teodord $

Author:

Narcis Marcu (narcism@users.sourceforge.net)

Constructor Summary

JsonDataSource(java.io.File file)

JsonDataSource(java.io.File file, java.lang.String selectExpression)

JsonDataSource(java.io.InputStream stream)

JsonDataSource(java.io.InputStream jsonStream, java.lang.String selectExpression)

JsonDataSource(JasperReportsContext jasperReportsContext, java.lang.String location, java.lang.String selectExpression)
Creates a data source instance that reads JSON data from a given location

JsonDataSource(java.lang.String location, java.lang.String selectExpression)

Method Summary

void	close()
java.lang.Object	getFieldValue(JRField jrField) Gets the field value for the current position.
protected org.codehaus.jackson.JsonNode	getJsonData(org.codehaus.jackson.JsonNode rootNode, java.lang.String jsonExpression) Extracts the JSON nodes based on the query expression
protected org.codehaus.jackson.JsonNode	goDownPath(org.codehaus.jackson.JsonNode rootNode, java.lang.String simplePath) Extracts the JSON nodes under the simple path
protected org.codehaus.jackson.JsonNode	goDownPathWithAttribute(org.codehaus.jackson.JsonNode rootNode, java.lang.String pathWithAttributeExpression) Extracts the JSON nodes that match the attribute expression
protected boolean	isValidExpression(org.codehaus.jackson.JsonNode operand, java.lang.String attributeExpression) Validates an attribute expression on a JsonNode
static void	main(java.lang.String[] args)
void	moveFirst() Moves back to the first element in the data source.
boolean	next() Tries to position the cursor on the next element in the data source.

Methods inherited from class net.sf.jasperreports.engine.data.JRAbstractTextDataSource

convertNumber, convertStringValue, getConvertBean, getDatePattern, getFormattedDate, getFormattedNumber, getLocale, getNumberPattern, getTimeZone, setDatePattern, setLocale, setLocale, setNumberPattern, setTextAttributes, setTimeZone, setTimeZone

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JsonDataSource

public JsonDataSource(java.io.InputStream stream)
               throws JRException

Throws:

JRException

JsonDataSource

public JsonDataSource(java.io.InputStream jsonStream,
                      java.lang.String selectExpression)
               throws JRException

Throws:

JRException

JsonDataSource

public JsonDataSource(java.io.File file)
               throws java.io.FileNotFoundException,
                      JRException

Throws:

java.io.FileNotFoundException

JRException

JsonDataSource

public JsonDataSource(java.io.File file,
                      java.lang.String selectExpression)
               throws java.io.FileNotFoundException,
                      JRException

Throws:

java.io.FileNotFoundException

JRException

JsonDataSource

public JsonDataSource(JasperReportsContext jasperReportsContext,
                      java.lang.String location,
                      java.lang.String selectExpression)
               throws JRException

Creates a data source instance that reads JSON data from a given location

Parameters:

jasperReportsContext - the JasperReportsContext

location - a String representing JSON data source

selectExpression - a String representing the select expression

Throws:

JRException

JsonDataSource

public JsonDataSource(java.lang.String location,
                      java.lang.String selectExpression)
               throws JRException

Throws:

JRException

See Also:

JsonDataSource(JasperReportsContext, String, String)

Method Detail

moveFirst

public void moveFirst()
               throws JRException

Description copied from interface: JRRewindableDataSource

Moves back to the first element in the data source.

Specified by:

moveFirst in interface JRRewindableDataSource

Throws:

JRException

next

public boolean next()

Description copied from interface: JRDataSource

Tries to position the cursor on the next element in the data source.

Specified by:

next in interface JRDataSource

Returns:

true if there is a next record, false otherwise

getFieldValue

public java.lang.Object getFieldValue(JRField jrField)
                               throws JRException

Description copied from interface: JRDataSource

Gets the field value for the current position.

Specified by:

getFieldValue in interface JRDataSource

Returns:

an object containing the field value. The object type must be the field object type.

Throws:

JRException

getJsonData

protected org.codehaus.jackson.JsonNode getJsonData(org.codehaus.jackson.JsonNode rootNode,
                                                    java.lang.String jsonExpression)
                                             throws JRException

Extracts the JSON nodes based on the query expression

Parameters:

rootNode -

jsonExpression -

Throws:

JRException

goDownPathWithAttribute

protected org.codehaus.jackson.JsonNode goDownPathWithAttribute(org.codehaus.jackson.JsonNode rootNode,
                                                                java.lang.String pathWithAttributeExpression)
                                                         throws JRException

Extracts the JSON nodes that match the attribute expression

Parameters:

rootNode -

pathWithAttributeExpression - : e.g. Orders(CustomerId == HILAA)

Throws:

JRException

goDownPath

protected org.codehaus.jackson.JsonNode goDownPath(org.codehaus.jackson.JsonNode rootNode,
                                                   java.lang.String simplePath)

Extracts the JSON nodes under the simple path

Parameters:

rootNode -

simplePath - - a simple field name, with no selection by attribute

isValidExpression

protected boolean isValidExpression(org.codehaus.jackson.JsonNode operand,
                                    java.lang.String attributeExpression)
                             throws JRException

Validates an attribute expression on a JsonNode

Parameters:

operand -

attributeExpression -

Throws:

JRException

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception

close

public void close()