xmlgrammarpreparser.java

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/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001, 2002 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
 * 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
 *        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.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact [e-mail].
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 * 5. Products derived from this software may not be called "Apache",
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * 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 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.parsers;

import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Locale;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.impl.XMLEntityManager;
import com.sun.org.apache.xerces.internal.impl.XMLErrorReporter;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.grammars.Grammar;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarLoader;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarPool;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLErrorHandler;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;

/**
 * <p> This class provides an easy way for a user to preparse grammars
 * of various types.  By default, it knows how to preparse external
 * DTD's and schemas; it provides an easy way for user applications to
 * register classes that know how to parse additional grammar types.
 * By default, it does no grammar caching; but it provides ways for
 * user applications to do so.
 *
 * @author Neil Graham, IBM
 *
 * @version $Id: XMLGrammarPreparser.java,v 1.8 2004/02/17 07:14:49 neeraj Exp $
 */
public class XMLGrammarPreparser {

    //
    // Constants
    //

    // feature:  continue-after-fatal-error
    private final static String CONTINUE_AFTER_FATAL_ERROR =
        Constants.XERCES_FEATURE_PREFIX + Constants.CONTINUE_AFTER_FATAL_ERROR_FEATURE;

    /** Property identifier: symbol table. */
    protected static final String SYMBOL_TABLE =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY;

    /** Property identifier: error reporter. */
    protected static final String ERROR_REPORTER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY;

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

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

    /** Property identifier: grammar pool . */
    protected static final String GRAMMAR_POOL =
        Constants.XERCES_PROPERTY_PREFIX + Constants.XMLGRAMMAR_POOL_PROPERTY;

    // the "built-in" grammar loaders
    private static final Hashtable KNOWN_LOADERS = new Hashtable();

    static {
        KNOWN_LOADERS.put(XMLGrammarDescription.XML_SCHEMA,
            "com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader");
        KNOWN_LOADERS.put(XMLGrammarDescription.XML_DTD,
            "com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDLoader");
    }

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

    // Data
    protected SymbolTable fSymbolTable;
    protected XMLErrorReporter fErrorReporter;
    protected XMLEntityResolver fEntityResolver;
    protected XMLGrammarPool fGrammarPool;

    protected Locale fLocale;

    // Hashtable holding our loaders
    private Hashtable fLoaders;

    //
    // Constructors
    //

    /** Default constructor. */
    public XMLGrammarPreparser() {
        this(new SymbolTable());
    } // <init>()

    /**
     * Constructs a preparser using the specified symbol table.
     *
     * @param symbolTable The symbol table to use.
     */
    public XMLGrammarPreparser (SymbolTable symbolTable) {
        fSymbolTable = symbolTable;

        fLoaders = new Hashtable();
        setLocale(Locale.getDefault());
        fErrorReporter = new XMLErrorReporter();
        fErrorReporter.setLocale(fLocale);
        fEntityResolver = new XMLEntityManager();
        // those are all the basic properties...
    } // <init>(SymbolTable)

    //
    // Public methods
    //

    /*
    * Register a type of grammar to make it preparsable.   If
    * the second parameter is null, the parser will use its  built-in
    * facilities for that grammar type.
    * This should be called by the application immediately
    * after creating this object and before initializing any properties/features.
    * @param type   URI identifying the type of the grammar
    * @param loader an object capable of preparsing that type; null if the ppreparser should use built-in knowledge.
    * @return true if successful; false if no built-in knowledge of
    *       the type or if unable to instantiate the string we know about
    */
    public boolean registerPreparser(String grammarType, XMLGrammarLoader loader) {