xmlentityscanner.java

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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * https://jaxp.dev.java.net/CDDLv1.0.html.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * https://jaxp.dev.java.net/CDDLv1.0.html
 * If applicable add the following below this CDDL HEADER
 * with the fields enclosed by brackets "[]" replaced with
 * your own identifying information: Portions Copyright
 * [year] [name of copyright owner]
 */

/*
 * $Id: XMLEntityScanner.java,v 1.9 2006/01/20 14:13:07 sunithareddy Exp $
 * @(#)XMLEntityScanner.java	1.16 06/07/13
 *
 * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
 */

/*
 * Copyright 2005 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.impl;

import com.sun.xml.internal.stream.Entity;
import com.sun.xml.internal.stream.XMLBufferListener;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

import java.util.Locale;
import java.util.Vector;
import com.sun.org.apache.xerces.internal.impl.io.ASCIIReader;
import com.sun.org.apache.xerces.internal.impl.io.UCSReader;
import com.sun.org.apache.xerces.internal.impl.io.UTF8Reader;


import com.sun.org.apache.xerces.internal.impl.msg.XMLMessageFormatter;
import com.sun.org.apache.xerces.internal.util.EncodingMap;

import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.util.XMLChar;
import com.sun.org.apache.xerces.internal.util.XMLStringBuffer;
import com.sun.org.apache.xerces.internal.xni.QName;
import com.sun.org.apache.xerces.internal.xni.XMLString;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponentManager;
import com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException;
import com.sun.org.apache.xerces.internal.xni.*;

/**
 * Implements the entity scanner methods.
 *
 * @author Neeraj Bajaj, Sun Microsystems
 * @author Andy Clark, IBM
 * @author Arnaud  Le Hors, IBM
 * @author K.Venugopal Sun Microsystems
 *
 */
public class XMLEntityScanner implements XMLLocator  {
    
    
    protected Entity.ScannedEntity fCurrentEntity = null ;
    protected int fBufferSize = XMLEntityManager.DEFAULT_BUFFER_SIZE;
    
    protected XMLEntityManager fEntityManager ;
    
    /** Debug switching readers for encodings. */
    private static final boolean DEBUG_ENCODINGS = false;
    /** Listeners which should know when load is being called */
    private Vector listeners = new Vector();
    
    public static final boolean [] VALID_NAMES = new boolean[127];
    
    /**
     * Debug printing of buffer. This debugging flag works best when you
     * resize the DEFAULT_BUFFER_SIZE down to something reasonable like
     * 64 characters.
     */
    private static final boolean DEBUG_BUFFER = false;
    private static final boolean DEBUG_SKIP_STRING = false;
    
    protected SymbolTable fSymbolTable = null;
    protected XMLErrorReporter fErrorReporter = null;
    int [] whiteSpaceLookup = new int[100];
    int whiteSpaceLen = 0;
    boolean whiteSpaceInfoNeeded = true;
    
    /**
     * Allow Java encoding names. This feature identifier is:
     * http://apache.org/xml/features/allow-java-encodings
     */
    protected boolean fAllowJavaEncodings;
    
    //Will be used only during internal subsets.
    //for appending data.
    
    /** 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;
    
    /** Feature identifier: allow Java encodings. */
    protected static final String ALLOW_JAVA_ENCODINGS =
            Constants.XERCES_FEATURE_PREFIX + Constants.ALLOW_JAVA_ENCODINGS_FEATURE;
    
    protected PropertyManager fPropertyManager = null ;
    
    boolean isExternal = false;
    static {
        
        for(int i=0x0041;i<=0x005A ; i++){
            VALID_NAMES[i]=true;
        }
        for(int i=0x0061;i<=0x007A; i++){
            VALID_NAMES[i]=true;
        }
        for(int i=0x0030;i<=0x0039; i++){
            VALID_NAMES[i]=true;
        }
        VALID_NAMES[45]=true;
        VALID_NAMES[46]=true;
        VALID_NAMES[58]=true;
        VALID_NAMES[95]=true;
    }
    
    //
    // Constructors
    //
    
    /** Default constructor. */
    public XMLEntityScanner() {
    } // <init>()
    
        
    /**  private constructor, this class can only be instantiated within this class. Instance of this class should
     *    be obtained using getEntityScanner() or getEntityScanner(ScannedEntity scannedEntity)
     *    @see getEntityScanner()
     *    @see getEntityScanner(ScannedEntity)
     */
    public XMLEntityScanner(PropertyManager propertyManager, XMLEntityManager entityManager) {
        fEntityManager = entityManager ;
        reset(propertyManager);
    } // <init>()
    
    
    // set buffer size:
    public void setBufferSize(int size) {
        // REVISIT: Buffer size passed to entity scanner
        // was not being kept in synch with the actual size
        // of the buffers in each scanned entity. If any
        // of the buffers were actually resized, it was possible
        // that the parser would throw an ArrayIndexOutOfBoundsException
        // for documents which contained names which are longer than
        // the current buffer size. Conceivably the buffer size passed
        // to entity scanner could be used to determine a minimum size
        // for resizing, if doubling its size is smaller than this
        // minimum. -- mrglavas
        fBufferSize = size;
    }
    
    /**
     * Resets the components.
     */
    public void reset(PropertyManager propertyManager){
        fSymbolTable = (SymbolTable)propertyManager.getProperty(SYMBOL_TABLE) ;
        fErrorReporter = (XMLErrorReporter)propertyManager.getProperty(ERROR_REPORTER) ;
        fCurrentEntity = null;
        whiteSpaceLen = 0;
        whiteSpaceInfoNeeded = true;
        listeners.clear();
    }
    
    /**
     * Resets the component. The component can query the component manager
     * about any features and properties that affect the operation of the
     * component.
     *
     * @param componentManager The component manager.
     *
     * @throws SAXException Thrown by component on initialization error.
     *                      For example, if a feature or property is
     *                      required for the operation of the component, the
     *                      component manager may throw a
     *                      SAXNotRecognizedException or a
     *                      SAXNotSupportedException.
     */
    public void reset(XMLComponentManager componentManager)
    throws XMLConfigurationException {
        
        //System.out.println(" this is being called");
        // xerces features
        try {
            fAllowJavaEncodings = componentManager.getFeature(ALLOW_JAVA_ENCODINGS);
        } catch (XMLConfigurationException e) {
            fAllowJavaEncodings = false;
        }
        
        //xerces properties
        fSymbolTable = (SymbolTable)componentManager.getProperty(SYMBOL_TABLE);
        fErrorReporter = (XMLErrorReporter)componentManager.getProperty(ERROR_REPORTER);
        fCurrentEntity = null;
        whiteSpaceLen = 0;
        whiteSpaceInfoNeeded = true;
        listeners.clear();
    } // reset(XMLComponentManager)
    
    
    public void reset(SymbolTable symbolTable, XMLEntityManager entityManager,
            XMLErrorReporter reporter) {
        fCurrentEntity = null;
        fSymbolTable = symbolTable;
        fEntityManager = entityManager;
        fErrorReporter = reporter;
    }
    
    /**
     * Returns the XML version of the current entity. This will normally be the
     * value from the XML or text declaration or defaulted by the parser. Note that
     * that this value may be different than the version of the processing rules 
     * applied to the current entity. For instance, an XML 1.1 document may refer to
     * XML 1.0 entities. In such a case the rules of XML 1.1 are applied to the entire 
     * document. Also note that, for a given entity, this value can only be considered
     * final once the XML or text declaration has been read or once it has been
     * determined that there is no such declaration.
     */
    public String getXMLVersion() {
        if (fCurrentEntity != null) {
            return fCurrentEntity.xmlVersion;
        }
        return null;
    } // getXMLVersion():String
    
    void setXMLVersion(String version) {
        fCurrentEntity.xmlVersion = version;
    }
        
    /** set the instance of current scanned entity.
     *   @param ScannedEntity
     */
    
    public  void setCurrentEntity(Entity.ScannedEntity scannedEntity){
        fCurrentEntity = scannedEntity ;
        if(fCurrentEntity != null){
            isExternal = fCurrentEntity.isExternal();
            if(DEBUG_BUFFER)
                System.out.println("Current Entity is "+scannedEntity.name);
        }
    }
    
    public  Entity.ScannedEntity getCurrentEntity(){
        return fCurrentEntity ;
    }
    //
    // XMLEntityReader methods
    //
    
    /**
     * Returns the base system identifier of the currently scanned
     * entity, or null if none is available.
     */
    public String getBaseSystemId() {
        return (fCurrentEntity != null && fCurrentEntity.entityLocation != null) ? fCurrentEntity.entityLocation.getExpandedSystemId() : null;
    } // getBaseSystemId():String
    
    /**
     * @see com.sun.org.apache.xerces.internal.xni.XMLResourceIdentifier#setBaseSystemId(String)
     */
    public void setBaseSystemId(String systemId) {
        //no-op
    }
    
    ///////////// Locator methods start.
    public int getLineNumber(){
        //if the entity is closed, we should return -1
        //xxx at first place why such call should be there...
        return fCurrentEntity != null ? fCurrentEntity.lineNumber : -1 ;
    }
    
    /**
     * @see com.sun.org.apache.xerces.internal.xni.XMLLocator#setLineNumber(int)
     */
    public void setLineNumber(int line) {
        //no-op
    }
    
    
    public int getColumnNumber(){
        //if the entity is closed, we should return -1
        //xxx at first place why such call should be there...
        return fCurrentEntity != null ? fCurrentEntity.columnNumber : -1 ;
    }
    
    /**
     * @see com.sun.org.apache.xerces.internal.xni.XMLLocator#setColumnNumber(int)
     */
    public void setColumnNumber(int col) {
        // no-op
    }
    
    
    public int getCharacterOffset(){
        return fCurrentEntity != null ? fCurrentEntity.fTotalCountTillLastLoad + fCurrentEntity.position : -1 ;
    }
    
    /** Returns the expanded system identifier.  */
    public String getExpandedSystemId() {
        return (fCurrentEntity != null && fCurrentEntity.entityLocation != null) ? fCurrentEntity.entityLocation.getExpandedSystemId() : null;
    }
    
    /**