xmldtdloader.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999-2003 The Apache Software Foundation.  
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 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
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 *    distribution.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
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 * 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 the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package com.sun.org.apache.xerces.internal.impl.dtd;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl;
import com.sun.org.apache.xerces.internal.impl.XMLErrorReporter;
import com.sun.org.apache.xerces.internal.impl.XMLEntityManager;
import com.sun.org.apache.xerces.internal.impl.msg.XMLMessageFormatter;

import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.util.DefaultErrorHandler;

import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarPool;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarLoader;
import com.sun.org.apache.xerces.internal.xni.grammars.Grammar;
import com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLErrorHandler;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;

import java.util.Locale;
import java.io.IOException;
import java.io.EOFException;

/**
 * The DTD loader. The loader knows how to build grammars from XMLInputSources.
 * It extends the DTD processor in order to do this; it's
 * a separate class because DTD processors don't need to know how
 * to talk to the outside world in their role as instance-document
 * helpers.
 * <p>
 * This component requires the following features and properties.  It
 * know ho to set them if no one else does:from the
 * <ul>
 *  <li>http://xml.org/sax/features/namespaces</li>
 *  <li>http://apache.org/xml/properties/internal/symbol-table</li>
 *  <li>http://apache.org/xml/properties/internal/error-reporter</li>
 *  <li>http://apache.org/xml/properties/internal/grammar-pool</li>
 *  <li>http://apache.org/xml/properties/internal/datatype-validator-factory</li>
 * </ul>
 * 
 * @xerces.internal
 *
 * @author Neil Graham, IBM
 *
 * @version $Id: XMLDTDLoader.java,v 1.1.2.1 2005/08/01 03:36:42 jeffsuttor Exp $
 */
public class XMLDTDLoader
        extends XMLDTDProcessor 
        implements XMLGrammarLoader {

    //
    // Constants
    //

    // feature identifiers

    /** Feature identifier: standard uri conformant feature. */
    protected static final String STANDARD_URI_CONFORMANT_FEATURE =
        Constants.XERCES_FEATURE_PREFIX + Constants.STANDARD_URI_CONFORMANT_FEATURE;

    // recognized features:
    private static final String[] RECOGNIZED_FEATURES = {
        VALIDATION,
        WARN_ON_DUPLICATE_ATTDEF,
        NOTIFY_CHAR_REFS,
        STANDARD_URI_CONFORMANT_FEATURE
    };

    // property identifiers

    /** Property identifier: error handler. */
    protected static final String ERROR_HANDLER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_HANDLER_PROPERTY;

    /** Property identifier: entity resolver. */
    public static final String ENTITY_RESOLVER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_RESOLVER_PROPERTY;

    /** Recognized properties. */
    private static final String[] LOADER_RECOGNIZED_PROPERTIES = {
        SYMBOL_TABLE,       
        ERROR_REPORTER,
        ERROR_HANDLER,
        ENTITY_RESOLVER,
        GRAMMAR_POOL,       
        DTD_VALIDATOR,
    };

    // enforcing strict uri?
    private boolean fStrictURI = false;

    /** Entity resolver . */
    protected XMLEntityResolver fEntityResolver;

    // the scanner we use to actually read the DTD
    protected XMLDTDScannerImpl fDTDScanner;

    // the entity manager the scanner needs.  
    protected XMLEntityManager fEntityManager;

    // what's our Locale?
    protected Locale fLocale;

    //
    // Constructors
    //

    /** Deny default construction; we need a SymtolTable! */
    public XMLDTDLoader() {
        this(new SymbolTable());
    } // <init>()

    public XMLDTDLoader(SymbolTable symbolTable) {
        this(symbolTable, null);
    } // init(SymbolTable)

    public XMLDTDLoader(SymbolTable symbolTable,
                XMLGrammarPool grammarPool) {
        this(symbolTable, grammarPool, null, new XMLEntityManager());
    } // init(SymbolTable, XMLGrammarPool)

    XMLDTDLoader(SymbolTable symbolTable,
                XMLGrammarPool grammarPool, XMLErrorReporter errorReporter, 
                XMLEntityResolver entityResolver) {
        fSymbolTable = symbolTable;
        fGrammarPool = grammarPool;
        if(errorReporter == null) {
            errorReporter = new XMLErrorReporter();
            errorReporter.setProperty(ERROR_HANDLER, new DefaultErrorHandler());
        }
        fErrorReporter = errorReporter;
        // Add XML message formatter if there isn't one.
        if (fErrorReporter.getMessageFormatter(XMLMessageFormatter.XML_DOMAIN) == null) {
            XMLMessageFormatter xmft = new XMLMessageFormatter();
            fErrorReporter.putMessageFormatter(XMLMessageFormatter.XML_DOMAIN, xmft);
            fErrorReporter.putMessageFormatter(XMLMessageFormatter.XMLNS_DOMAIN, xmft);
        }
        fEntityResolver = entityResolver;
        if(fEntityResolver instanceof XMLEntityManager) {
            fEntityManager = (XMLEntityManager)fEntityResolver;
        } else {
            fEntityManager = new XMLEntityManager();
        }
        fEntityManager.setProperty(Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY, errorReporter);
        fDTDScanner = new XMLDTDScannerImpl(fSymbolTable, fErrorReporter, fEntityManager);
        fDTDScanner.setDTDHandler(this);
        fDTDScanner.setDTDContentModelHandler(this);
        reset();
    } // init(SymbolTable, XMLGrammarPool, XMLErrorReporter, XMLEntityResolver)

    // XMLGrammarLoader methods

    /**
     * Sets the state of a feature. This method is called by the component
     * manager any time after reset when a feature changes state. 
     * <p>
     * <strong>Note:</strong> Components should silently ignore features