org.apache.xerces.impl.XMLVersionDetector Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.xerces.impl;

import java.io.CharConversionException;
import java.io.EOFException;
import java.io.IOException;

import org.apache.xerces.impl.io.MalformedByteSequenceException;
import org.apache.xerces.impl.msg.XMLMessageFormatter;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.parser.XMLComponentManager;
import org.apache.xerces.xni.parser.XMLConfigurationException;
import org.apache.xerces.xni.parser.XMLInputSource;

/**
 * This class scans the version of the document to determine
 * which scanner to use: XML 1.1 or XML 1.0.
 * The version is scanned using XML 1.1. scanner.  
 * 
 * @xerces.internal
 * 
 * @author Neil Graham, IBM 
 * @author Elena Litani, IBM
 * @version $Id: XMLVersionDetector.java 699892 2008-09-28 21:08:27Z mrglavas $
 */
public class XMLVersionDetector {

    //
    // Constants
    //

    private static final char[] XML11_VERSION = new char[]{'1', '.', '1'};

    // property identifiers

    /** 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: entity manager. */
    protected static final String ENTITY_MANAGER = 
        Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_MANAGER_PROPERTY;

    //
    // Data
    //

    /** Symbol: "version". */
    protected static final String fVersionSymbol = "version".intern();

    // symbol:  [xml]:
    protected static final String fXMLSymbol = "[xml]".intern();

    /** Symbol table. */
    protected SymbolTable fSymbolTable;

    /** Error reporter. */
    protected XMLErrorReporter fErrorReporter;

    /** Entity manager. */
    protected XMLEntityManager fEntityManager;

    protected String fEncoding = null;

    private final char [] fExpectedVersionString = {'<', '?', 'x', 'm', 'l', ' ', 'v', 'e', 'r', 's', 
                    'i', 'o', 'n', '=', ' ', ' ', ' ', ' ', ' '};

    /**
     * 
     * 
     * @param componentManager The component manager.
     *
     * @throws XNIException Throws exception if required features and
     *                      properties cannot be found.
     */
    public void reset(XMLComponentManager componentManager)
        throws XMLConfigurationException {

        // Xerces properties
        fSymbolTable = (SymbolTable)componentManager.getProperty(SYMBOL_TABLE);
        fErrorReporter = (XMLErrorReporter)componentManager.getProperty(ERROR_REPORTER);
        fEntityManager = (XMLEntityManager)componentManager.getProperty(ENTITY_MANAGER);
        for(int i=14; i currentEntity.ch.length) {
            //resize array; this case is hard to imagine...
            char[] tempCh = currentEntity.ch;
            currentEntity.ch = new char[length+currentEntity.count-currentEntity.position+1];
            System.arraycopy(tempCh, 0, currentEntity.ch, 0, tempCh.length);
        }
        if(currentEntity.position < length) {
            // have to move sensitive stuff out of the way...
            System.arraycopy(currentEntity.ch, currentEntity.position, currentEntity.ch, length, currentEntity.count-currentEntity.position);
            currentEntity.count += length-currentEntity.position;
        } else {
            // have to reintroduce some whitespace so this parses:
            for(int i=length; i