litexmldocument.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 * $Id: LiteXMLDocument.java,v 1.42 2005/06/13 16:22:43 bondolo Exp $
 ********************
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 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 end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``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 SUN MICROSYSTEMS 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.
 *
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 ********************
 */

package net.jxta.impl.document;


import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Constructor;
import java.util.Enumeration;
import java.util.Vector;

import java.io.IOException;
import java.lang.reflect.UndeclaredThrowableException;

import net.jxta.document.MimeMediaType;
import net.jxta.document.StructuredDocument;
import net.jxta.document.StructuredDocumentFactory;
import net.jxta.document.StructuredTextDocument;
import net.jxta.document.TextElement;


/**
 * This class is an implementation of the StructuredDocument interface using
 * a simplified XML implementation.
 **/
public class LiteXMLDocument extends LiteXMLElement implements XMLDocumentCommon {
    
    /**
     *  {@inheritDoc}
     **/
    private final static class Instantiator implements StructuredDocumentFactory.TextInstantiator {
        
        // "x-" is a mime-type convention for indicating partial or provisional
        // compliance to a standard
        private static final MimeMediaType[] myTypes = {
            MimeMediaType.XML_DEFAULTENCODING, new MimeMediaType("Text", "x-Xml"), new MimeMediaType("Application", "Xml"),
            new MimeMediaType("Application", "x-Xml"),
        };
        
        // these are the file extensions which are likely to contain files of
        // the type i like.
        private static final ExtensionMapping[] myExtensions = {
            new ExtensionMapping("xml", myTypes[0]), new ExtensionMapping("xml", (MimeMediaType) null)
        };
        
        /**
         * Creates new LiteXMLDocumentInstantiator
         **/
        public Instantiator() {}
        
        /**
         *  {@inheritDoc}
         **/
        public MimeMediaType[] getSupportedMimeTypes() {
            return(myTypes);
        }
        
        /**
         *  {@inheritDoc}
         **/
        public ExtensionMapping[] getSupportedFileExtensions() {
            return(myExtensions);
        }
        
        /**
         *  {@inheritDoc}
         **/
        public StructuredDocument newInstance(MimeMediaType mimeType, String doctype) {
            return new LiteXMLDocument(mimeType, doctype);
        }
        
        /**
         *  {@inheritDoc}
         **/
        public StructuredDocument newInstance(MimeMediaType mimeType, String doctype, String value) {
            return new LiteXMLDocument(mimeType, doctype, value);
        }
        
        /**
         *  {@inheritDoc}
         **/
        public StructuredDocument newInstance(MimeMediaType mimeType, InputStream source) throws IOException {
            return new LiteXMLDocument(mimeType, source);
        }
        
        /**
         *  {@inheritDoc}
         **/
        public StructuredDocument newInstance(MimeMediaType mimeType, Reader source) throws IOException {
            return new LiteXMLDocument(mimeType, source);
        }
    }
    
    /**
     *  The instantiator for instances of our documents.
     **/
    public static final StructuredDocumentFactory.TextInstantiator INSTANTIATOR = new Instantiator();
    
    /**
     *  The actual document contents.
     **/
    final StringBuffer docContent;
      
    /**
     *  The mimetype of this document.
     **/
    private final MimeMediaType mimeType;
    
    /**
     * Creates new LiteXMLDocument
     **/
    LiteXMLDocument(MimeMediaType mimeType, String type) {
        this(mimeType, type, "");
    }
    
    /**
     * Creates new LiteXMLDocument with a textValue in the root element
     **/
    LiteXMLDocument(MimeMediaType mimeType, String type, String textValue) {
        super(null, (LiteXMLElement.tagRange) null);
        
        parent = this;
        
        this.mimeType = mimeType;
        
        docContent = new StringBuffer();
        
        for (int eachChar = type.length() - 1; eachChar >= 0; eachChar--) {
            if (Character.isWhitespace(type.charAt(eachChar))) {
                throw new IllegalArgumentException("Root tag may not contain spaces");
            }
        }
        
        if (null == textValue) {
            textValue = "";
        }
        
        StringBuffer seedDoc = new StringBuffer(textValue.length() + 3 * type.length() + 128);
        
        seedDoc.append("<?xml version=\"1.0\"");
        
        String charset = mimeType.getParameter("charset");
        
        if (charset != null) {
            seedDoc.append(" encoding=\"");
            seedDoc.append(charset);
            seedDoc.append("\"");
        }
        seedDoc.append("?>\n");
        
        seedDoc.append("<!DOCTYPE ");
        seedDoc.append(type);
        seedDoc.append(">\n");
        
        seedDoc.append('<');
        seedDoc.append(type);
        seedDoc.append('>');
        
        seedDoc.append(textValue);
        
        seedDoc.append("</");
        seedDoc.append(type);
        seedDoc.append('>');
        
        try {
            init(new StringReader(seedDoc.toString()));
        } catch (IOException caught) {
            throw new UndeclaredThrowableException(caught);
        }
    }
    
    /**
     * Creates new LiteXMLDocument
     **/
    LiteXMLDocument(MimeMediaType mimeType, InputStream in) throws IOException {
        super(null, (LiteXMLElement.tagRange) null);
        
        parent = this;
        
        this.mimeType = mimeType;
        
        docContent = new StringBuffer();
        
        String charset = mimeType.getParameter("charset");
        
        if (charset == null) {
            init(new InputStreamReader(in));
        } else {
            init(new InputStreamReader(in, charset));
        }
    }
    
    /**
     * Creates new LiteXMLDocument
     **/
    LiteXMLDocument(MimeMediaType mimeType, Reader in) throws IOException {