/*
* 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
* 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 apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* 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) 2003, 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;
import java.io.EOFException;
import java.io.IOException;
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.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.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.
*
* @author Neil Graham, IBM
* @author Elena Litani, IBM
* @version $Id: XMLVersionDetector.java,v 1.12 2004/02/27 20:36:07 mrglavas Exp $
*/
public class XMLVersionDetector {
//
// Constants
//
private final static 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 final static 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 XMLString fVersionNum = new XMLString();
private final char [] fExpectedVersionString = {'<', '?', 'x', 'm', 'l', ' ', 'v', 'e', 'r', 's',
'i', 'o', 'n', '=', ' ', ' ', ' ', ' ', ' '};
/**
*
*
* @param componentManager The component manager.
*
* @throws SAXException 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<fExpectedVersionString.length; i++ )
fExpectedVersionString[i] = ' ';
} // reset(XMLComponentManager)
/**
* Reset the reference to the appropriate scanner given the version of the
* document and start document scanning.
* @param scanner - the scanner to use
* @param version - the version of the document (XML 1.1 or XML 1.0).
*/
public void startDocumentParsing(XMLEntityHandler scanner, short version){
if (version == Constants.XML_VERSION_1_0){
fEntityManager.setScannerVersion(Constants.XML_VERSION_1_0);
}
else {
fEntityManager.setScannerVersion(Constants.XML_VERSION_1_1);
}
// Make sure the locator used by the error reporter is the current entity scanner.
fErrorReporter.setDocumentLocator(fEntityManager.getEntityScanner());
// Note: above we reset fEntityScanner in the entity manager, thus in startEntity
// in each scanner fEntityScanner field must be reset to reflect the change.
//
fEntityManager.setEntityHandler(scanner);
scanner.startEntity(fXMLSymbol, fEntityManager.getCurrentResourceIdentifier(), fEncoding, null);
}
/**
* This methods scans the XML declaration to find out the version
* (and provisional encoding) of the document.
* The scanning is doing using XML 1.1 scanner.
* @param inputSource
* @return short - Constants.XML_VERSION_1_1 if document version 1.1,
* otherwise Constants.XML_VERSION_1_0
* @throws IOException
*/
public short determineDocVersion(XMLInputSource inputSource) throws IOException {
fEncoding = fEntityManager.setupCurrentEntity(fXMLSymbol, inputSource, false, true);
// Must use XML 1.0 scanner to handle whitespace correctly
// in the XML declaration.
fEntityManager.setScannerVersion(Constants.XML_VERSION_1_0);
XMLEntityScanner scanner = fEntityManager.getEntityScanner();
try {
if (!scanner.skipString("<?xml")) {
// definitely not a well-formed 1.1 doc!
return Constants.XML_VERSION_1_0;
}
if (!scanner.skipDeclSpaces()) {
fixupCurrentEntity(fEntityManager, fExpectedVersionString, 5);
return Constants.XML_VERSION_1_0;
}
if (!scanner.skipString("version")) {
fixupCurrentEntity(fEntityManager, fExpectedVersionString, 6);
return Constants.XML_VERSION_1_0;
}
scanner.skipDeclSpaces();
// Check if the next character is '='. If it is then consume it.
if (scanner.peekChar() != '=') {
fixupCurrentEntity(fEntityManager, fExpectedVersionString, 13);
return Constants.XML_VERSION_1_0;
}
scanner.scanChar();
scanner.skipDeclSpaces();
int quoteChar = scanner.scanChar();
fExpectedVersionString[14] = (char) quoteChar;
for (int versionPos = 0; versionPos < XML11_VERSION.length; versionPos++) {
fExpectedVersionString[15 + versionPos] = (char) scanner.scanChar();
}
// REVISIT: should we check whether this equals quoteChar?
fExpectedVersionString[18] = (char) scanner.scanChar();
fixupCurrentEntity(fEntityManager, fExpectedVersionString, 19);
int matched = 0;
for (; matched < XML11_VERSION.length; matched++) {
if (fExpectedVersionString[15 + matched] != XML11_VERSION[matched])
break;
}
if (matched == XML11_VERSION.length)
return Constants.XML_VERSION_1_1;
return Constants.XML_VERSION_1_0;
// premature end of file
}
catch (EOFException e) {
fErrorReporter.reportError(
XMLMessageFormatter.XML_DOMAIN,
"PrematureEOF",
null,
XMLErrorReporter.SEVERITY_FATAL_ERROR);
return Constants.XML_VERSION_1_0;
}
}
// This method prepends "length" chars from the char array,
// from offset 0, to the manager's fCurrentEntity.ch.
private void fixupCurrentEntity(XMLEntityManager manager,
char [] scannedChars, int length) {
XMLEntityManager.ScannedEntity currentEntity = manager.getCurrentEntity();
if(currentEntity.count-currentEntity.position+length > 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<currentEntity.position; i++)
currentEntity.ch[i]=' ';
}
// prepend contents...
System.arraycopy(scannedChars, 0, currentEntity.ch, 0, length);
currentEntity.position = 0;
currentEntity.columnNumber = currentEntity.lineNumber = 1;
}
} // class XMLVersionDetector
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