dominputimpl.java

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/*
 * Copyright 2001, 2002,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.dom;

import org.w3c.dom.ls.LSInput;

import java.io.Reader;
import java.io.InputStream;

/**
 * This Class <code>DOMInputImpl</code> represents a single input source for an XML entity.
 * <p> This Class allows an application to encapsulate information about
 * an input source in a single object, which may include a public
 * identifier, a system identifier, a byte stream (possibly with a specified
 * encoding), and/or a character stream.
 * <p> The exact definitions of a byte stream and a character stream are
 * binding dependent.
 * <p> There are two places that the application will deliver this input
 * source to the parser: as the argument to the <code>parse</code> method,
 * or as the return value of the <code>DOMResourceResolver.resolveEntity</code>
 *  method.
 * <p> The <code>DOMParser</code> will use the <code>LSInput</code>
 * object to determine how to read XML input. If there is a character stream
 * available, the parser will read that stream directly; if not, the parser
 * will use a byte stream, if available; if neither a character stream nor a
 * byte stream is available, the parser will attempt to open a URI
 * connection to the resource identified by the system identifier.
 * <p> An <code>LSInput</code> object belongs to the application: the
 * parser shall never modify it in any way (it may modify a copy if
 * necessary).  Eventhough all attributes in this interface are writable the
 * DOM implementation is expected to never mutate a LSInput.
 * <p>See also the <a href='http://www.w3.org/TR/2001/WD-DOM-Level-3-ASLS-20011025'>Document Object Model (DOM) Level 3 Abstract Schemas and Load
and Save Specification</a>.
 *
 * @xerces.internal
 *
 * @author Gopal Sharma, SUN Microsystems Inc.
 * @version $Id: DOMInputImpl.java,v 1.2.6.1 2005/08/30 13:20:42 sunithareddy Exp $
 */

// REVISIT:
// 1. it should be possible to do the following
// DOMInputImpl extends XMLInputSource implements LSInput
// 2. we probably need only the default constructor.  -- el

public class DOMInputImpl implements LSInput {

	//
	// Data
	//

	protected String fPublicId = null;
	protected String fSystemId = null;
	protected String fBaseSystemId = null;

	protected InputStream fByteStream = null;
	protected Reader fCharStream	= null;
	protected String fData = null;

	protected String fEncoding = null;

        protected boolean fCertifiedText = false;

   /**
     * Default Constructor, constructs an input source
     *
     *
     */
     public DOMInputImpl() {}

   /**
     * Constructs an input source from just the public and system
     * identifiers, leaving resolution of the entity and opening of
     * the input stream up to the caller.
     *
     * @param publicId     The public identifier, if known.
     * @param systemId     The system identifier. This value should
     *                     always be set, if possible, and can be
     *                     relative or absolute. If the system identifier
     *                     is relative, then the base system identifier
     *                     should be set.
     * @param baseSystemId The base system identifier. This value should
     *                     always be set to the fully expanded URI of the
     *                     base system identifier, if possible.
     */

    public DOMInputImpl(String publicId, String systemId,
                          String baseSystemId) {

		fPublicId = publicId;
		fSystemId = systemId;
		fBaseSystemId = baseSystemId;

    } // DOMInputImpl(String,String,String)

    /**
     * Constructs an input source from a byte stream.
     *
     * @param publicId     The public identifier, if known.
     * @param systemId     The system identifier. This value should
     *                     always be set, if possible, and can be
     *                     relative or absolute. If the system identifier
     *                     is relative, then the base system identifier
     *                     should be set.
     * @param baseSystemId The base system identifier. This value should
     *                     always be set to the fully expanded URI of the
     *                     base system identifier, if possible.
     * @param byteStream   The byte stream.
     * @param encoding     The encoding of the byte stream, if known.
     */

    public DOMInputImpl(String publicId, String systemId,
                          String baseSystemId, InputStream byteStream,
                          String encoding) {

		fPublicId = publicId;
		fSystemId = systemId;
		fBaseSystemId = baseSystemId;
		fByteStream = byteStream;
		fEncoding = encoding;

    } // DOMInputImpl(String,String,String,InputStream,String)

   /**
     * Constructs an input source from a character stream.
     *
     * @param publicId     The public identifier, if known.
     * @param systemId     The system identifier. This value should
     *                     always be set, if possible, and can be
     *                     relative or absolute. If the system identifier
     *                     is relative, then the base system identifier
     *                     should be set.
     * @param baseSystemId The base system identifier. This value should
     *                     always be set to the fully expanded URI of the
     *                     base system identifier, if possible.
     * @param charStream   The character stream.
     * @param encoding     The original encoding of the byte stream
     *                     used by the reader, if known.
     */

     public DOMInputImpl(String publicId, String systemId,
                          String baseSystemId, Reader charStream,
                          String encoding) {

		fPublicId = publicId;
		fSystemId = systemId;
		fBaseSystemId = baseSystemId;
		fCharStream = charStream;
		fEncoding = encoding;

     } // DOMInputImpl(String,String,String,Reader,String)

   /**
     * Constructs an input source from a String.
     *
     * @param publicId     The public identifier, if known.
     * @param systemId     The system identifier. This value should
     *                     always be set, if possible, and can be
     *                     relative or absolute. If the system identifier
     *                     is relative, then the base system identifier
     *                     should be set.
     * @param baseSystemId The base system identifier. This value should
     *                     always be set to the fully expanded URI of the
     *                     base system identifier, if possible.
     * @param data		   The String Data.
     * @param encoding     The original encoding of the byte stream
     *                     used by the reader, if known.
     */

     public DOMInputImpl(String publicId, String systemId,
                          String baseSystemId, String data,
                          String encoding) {
                fPublicId = publicId;
		fSystemId = systemId;
		fBaseSystemId = baseSystemId;
		fData = data;
		fEncoding = encoding;
     } // DOMInputImpl(String,String,String,String,String)

   /**
     * An attribute of a language-binding dependent type that represents a