documentinputsource.java

Java的面向对象数据库系统的源代码

/*
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 * 
 * This software is open source. 
 * See the bottom of this file for the licence.
 * 
 * $Id: DocumentInputSource.java,v 1.2 2003/06/10 16:18:34 per_nyfelt Exp $
 */

package org.dom4j.io;

import org.dom4j.Document;
import org.xml.sax.InputSource;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;


/** <p><code>DocumentInputSource</code> implements a SAX {@link InputSource}
  * for a {@link Document}.</p>
  *
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  * @version $Revision: 1.2 $
  */
class DocumentInputSource extends InputSource {

    /** The document source */
    private Document document;
    

    public DocumentInputSource() {
    }

    public DocumentInputSource(Document document) {
        this.document = document;
        setSystemId( document.getName() );
    }


    // Properties
    //-------------------------------------------------------------------------                

    /** @return the document which is being used as the SAX {@link InputSource}
      */
    public Document getDocument() {
        return document;
    }

    /** Sets the document used as the SAX {@link InputSource}
      */
    public void setDocument(Document document) {
        this.document = document;
        setSystemId( document.getName() );
    }


    // Overloaded methods
    //-------------------------------------------------------------------------                

    /** This method is not supported as this source is always a 
      * {@link Document} instance.
      *
      * @throws UnsupportedOperationException as this method is unsupported
      */
    public void setCharacterStream(Reader characterStream) 
            throws UnsupportedOperationException {
        throw new UnsupportedOperationException();
    }

    /** Note this method is quite inefficent, it turns the in memory XML tree
      * object model into a single block of text which can then be read by
      * other XML parsers. Should only be used with care.
      */
    public Reader getCharacterStream() {
        try {
            StringWriter out = new StringWriter();
            XMLWriter writer = new XMLWriter( out );
            writer.write( document );
            writer.flush();
            return new StringReader( out.toString() );
        }
        catch (final IOException e) {
            // this should never really happen 
            // but for completeness we'll return a Reader
            // with the embedded exception inside it
            return new Reader() {
                public int read(char ch[], int offset, int length) 
                    throws IOException {
                    throw e;
                }
                public void close() throws IOException {
                }
            };
        }
    }
}







/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "DOM4J" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of MetaStuff, Ltd.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "DOM4J"
 *    nor may "DOM4J" appear in their names without prior written
 *    permission of MetaStuff, Ltd. DOM4J is a registered
 *    trademark of MetaStuff, Ltd.
 *
 * 5. Due credit should be given to the DOM4J Project
 *    (http://dom4j.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * $Id: DocumentInputSource.java,v 1.2 2003/06/10 16:18:34 per_nyfelt Exp $
 */