Package net.sf.jasperreports.engine.util

Source Code of net.sf.jasperreports.engine.util.JRXmlUtils

/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. 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 <http://www.gnu.org/licenses/>.
*/
package net.sf.jasperreports.engine.util;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import net.sf.jasperreports.engine.JRException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
* XML parsing utilities.
*
* @author Lucian Chirita (lucianc@users.sourceforge.net)
* @version $Id: JRXmlUtils.java 3712 2010-04-08 09:53:09Z teodord $
*/
public final class JRXmlUtils
{
  private static final Log log = LogFactory.getLog(JRXmlUtils.class);
 
 
  /**
   * Parses an input source into a document.
   *
   * @param is the input source
   * @return the parsed document
   * @throws JRException
   */
  public static Document parse(InputSource is) throws JRException
  {
    try
    {
      return createDocumentBuilder().parse(is);
    }
    catch (SAXException e)
    {
      throw new JRException("Failed to parse the xml document", e);
    }
    catch (IOException e)
    {
      throw new JRException("Failed to parse the xml document", e);
    }
  }
 
 
  /**
   * Parses a document specified by an URI.
   *
   * @param uri the URI
   * @return the parsed document
   * @throws JRException
   */
  public static Document parse(String uri) throws JRException
  {
    return parse(new InputSource(uri));
  }

 
  /**
   * Parses a file into a document.
   *
   * @param file the XML file
   * @return the document
   * @throws JRException
   */
  public static Document parse(File file) throws JRException
  {
    try
    {
      return createDocumentBuilder().parse(file);
    }
    catch (SAXException e)
    {
      throw new JRException("Failed to parse the xml document", e);
    }
    catch (IOException e)
    {
      throw new JRException("Failed to parse the xml document", e);
    }
  }

 
  /**
   * Parses an input stream into a XML document.
   *
   * @param is the input stream
   * @return the document
   * @throws JRException
   */
  public static Document parse(InputStream is) throws JRException
  {
    return parse(new InputSource(is));
  }

 
  /**
   * Parses an URL stream as a XML document.
   *
   * @param url the URL
   * @return the document
   * @throws JRException
   */
  public static Document parse(URL url) throws JRException
  {
    InputStream is = null;
    try
    {
      is = url.openStream();
      return createDocumentBuilder().parse(is);
    }
    catch (SAXException e)
    {
      throw new JRException("Failed to parse the xmlf document", e);
    }
    catch (IOException e)
    {
      throw new JRException("Failed to parse the xml document", e);
    }
    finally
    {
      if (is != null)
      {
        try
        {
          is.close();
        }
        catch (IOException e)
        {
          log.warn("Error closing stream of URL " + url, e);
        }
      }
    }
  }

 
  /**
   * Creates a XML document builder.
   *
   * @return a XML document builder
   * @throws JRException
   */
  public static DocumentBuilder createDocumentBuilder() throws JRException
  {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    dbf.setValidating(false);
    dbf.setIgnoringComments(true);

    try
    {
      return dbf.newDocumentBuilder();
    }
    catch (ParserConfigurationException e)
    {
      throw new JRException("Failed to create a document builder factory", e);
    }
  }

 
  /**
   * Creates a document having a node as root.
   *
   * @param sourceNode the node
   * @return a document having the specified node as root
   * @throws JRException
   */
  public static Document createDocument(Node sourceNode) throws JRException
  {
    Document doc = JRXmlUtils.createDocumentBuilder().newDocument();
    Node source;
    if (sourceNode.getNodeType() == Node.DOCUMENT_NODE) {
      source = ((Document) sourceNode).getDocumentElement();
    } else {
      source = sourceNode;
    }

    Node node = doc.importNode(source, true);
    doc.appendChild(node);
   
    return doc;
  }
 
 
  private JRXmlUtils()
  {
  }
}
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