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JasperReports Xalan Data Source
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/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2023 Cloud Software Group, Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see
{
// the xml document
private Document document;
// the XPath select expression that gives the nodes to iterate
private String selectExpression;
// the node list
private NodeList nodeList;
// the node list length
private int nodeListLength;
// the current node
private Node currentNode;
// current node index
private int currentNodeIndex = - 1;
private final XalanNsAwareXPathExecuter xPathExecuter = new XalanNsAwareXPathExecuter();
private final JRXmlDocumentProducer documentProducer;
private boolean mustBeMovedFirst;
// -----------------------------------------------------------------
// Constructors
/**
* Creates the data source by parsing the xml document from the given file.
* The data source will contain exactly one record consisting of the document node itself.
*
* @param document the document
* @throws JRException if the data source cannot be created
*/
public XalanXmlDataSource(Document document) throws JRException {
this(document, ".");
}
/**
* Creates the data source by parsing the xml document from the given file.
* An additional XPath expression specifies the select criteria that produces the
* nodes (records) for the data source.
*
* @param document the document
* @param selectExpression the XPath select expression
* @throws JRException if the data source cannot be created
*/
public XalanXmlDataSource(Document document, String selectExpression)
throws JRException {
this.document = document;
this.selectExpression = selectExpression;
this.documentProducer = new JRXmlDocumentProducer();
mustBeMovedFirst = true;
}
/**
* Creates the data source by parsing the xml document from the given input stream.
*
* @param in the input stream
* @see JRXmlDataSource#JRXmlDataSource(Document)
*/
public XalanXmlDataSource(InputStream in) throws JRException {
this(in, ".");
}
/**
* Creates the data source by parsing the xml document from the given input stream.
*
* @see JRXmlDataSource#JRXmlDataSource(InputStream)
* @see JRXmlDataSource#JRXmlDataSource(Document, String)
*/
public XalanXmlDataSource(InputStream in, String selectExpression)
throws JRException {
this.selectExpression = selectExpression;
this.documentProducer = new JRXmlDocumentProducer(in);
mustBeMovedFirst = true;
}
/**
* Creates the data source by parsing the xml document from the given system identifier (URI).
* If the system identifier is a URL, it must be full resolved.
*
* @param uri the system identifier
* @see JRXmlDataSource#JRXmlDataSource(Document)
*/
public XalanXmlDataSource(String uri) throws JRException {
this(uri, ".");
}
/**
* Creates the data source by parsing the xml document from the given system identifier (URI).
*
* @see JRXmlDataSource#JRXmlDataSource(String)
* @see JRXmlDataSource#JRXmlDataSource(Document, String)
*/
public XalanXmlDataSource(String uri, String selectExpression)
throws JRException {
this.selectExpression = selectExpression;
this.documentProducer = new JRXmlDocumentProducer(uri);
mustBeMovedFirst = true;
}
/**
* Creates the data source by parsing the xml document from the given file.
*
* @param file the file
* @see JRXmlDataSource#JRXmlDataSource(Document)
*/
public XalanXmlDataSource(File file) throws JRException {
this(file, ".");
}
/**
* Creates the data source by parsing the xml document from the given file.
*
* @see JRXmlDataSource#JRXmlDataSource(File)
* @see JRXmlDataSource#JRXmlDataSource(Document, String)
*/
public XalanXmlDataSource(File file, String selectExpression)
throws JRException {
this.selectExpression = selectExpression;
this.documentProducer = new JRXmlDocumentProducer(file);
mustBeMovedFirst = true;
}
@Override
public Document getDocument()
{
return document;
}
// -----------------------------------------------------------------
// Implementation
/*
* (non-Javadoc)
*
* @see net.sf.jasperreports.engine.JRRewindableDataSource#moveFirst()
*/
@Override
public void moveFirst() throws JRException {
if (document == null)
{
document = documentProducer.getDocument();
if (document == null)
{
throw
new JRException(
EXCEPTION_MESSAGE_KEY_NULL_DOCUMENT,
(Object[])null);
}
}
if (selectExpression == null)
{
throw
new JRException(
EXCEPTION_MESSAGE_KEY_NULL_SELECT_EXPRESSION,
(Object[])null);
}
currentNode = null;
currentNodeIndex = -1;
nodeListLength = 0;
nodeList = xPathExecuter.selectNodeList(document,
selectExpression);
nodeListLength = nodeList.getLength();
}
protected void checkMoveFirst() throws JRException
{
if(mustBeMovedFirst)
{
moveFirst();
mustBeMovedFirst = false;
}
}
/*
* (non-Javadoc)
*
* @see net.sf.jasperreports.engine.JRDataSource#next()
*/
@Override
public boolean next() throws JRException
{
checkMoveFirst();
if(currentNodeIndex == nodeListLength - 1)
{
return false;
}
currentNode = nodeList.item(++ currentNodeIndex);
return true;
}
@Override
public int recordCount() throws JRException
{
checkMoveFirst();
return nodeListLength;
}
@Override
public int currentIndex()
{
return currentNodeIndex;
}
@Override
public void moveToRecord(int index) throws JRException
{
if (index >= 0 && index < nodeListLength)
{
currentNodeIndex = index;
currentNode = nodeList.item(index);
}
else
{
throw new NoRecordAtIndexException(index);
}
}
@Override
public Document subDocument() throws JRException
{
if(currentNode == null)
{
throw
new JRException(
EXCEPTION_MESSAGE_KEY_NODE_NOT_AVAILABLE,
(Object[])null);
}
// create a new document from the current node
return documentProducer.getDocument(currentNode);
}
public void setXmlNamespaceMap(Map xmlNamespaceMap) throws JRException
{
this.xPathExecuter.setXmlNamespaceMap(xmlNamespaceMap);
}
public void setDetectXmlNamespaces(boolean detectXmlNamespaces)
{
this.xPathExecuter.setDetectXmlNamespaces(detectXmlNamespaces);
}
public void setDocumentBuilderFactory(DocumentBuilderFactory documentBuilderFactory)
{
this.documentProducer.setDocumentBuilderFactory(documentBuilderFactory);
}
@Override
public Node getCurrentNode() {
return currentNode;
}
@Override
public Object getSelectObject(Node currentNode, String expression) throws JRException {
return xPathExecuter.selectObject(currentNode, expression);
}
@Override
public XalanXmlDataSource subDataSource(String selectExpr)
throws JRException {
Document doc = subDocument();
XalanXmlDataSource subDataSource = new XalanXmlDataSource(doc, selectExpr);
subDataSource.setTextAttributes(this);
subDataSource.setXmlNamespaceMap(xPathExecuter.getXmlNamespaceMap());
subDataSource.setDetectXmlNamespaces(xPathExecuter.getDetectXmlNamespaces());
subDataSource.setDocumentBuilderFactory(documentProducer.getDocumentBuilderFactory());
return subDataSource;
}
@Override
public XalanXmlDataSource dataSource(String selectExpr)
throws JRException {
XalanXmlDataSource subDataSource = new XalanXmlDataSource(document, selectExpr);
subDataSource.setTextAttributes(this);
subDataSource.setXmlNamespaceMap(xPathExecuter.getXmlNamespaceMap());
subDataSource.setDetectXmlNamespaces(xPathExecuter.getDetectXmlNamespaces());
subDataSource.setDocumentBuilderFactory(documentProducer.getDocumentBuilderFactory());
return subDataSource;
}
}