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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
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 * permission notice:
 *
 * 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
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/*
 * $Id: StringValueHandler.java,v 1.11 2010-11-01 04:34:29 joehw Exp $
 */
package com.sun.org.apache.xalan.internal.xsltc.runtime;

import org.xml.sax.SAXException;

import com.sun.org.apache.xml.internal.serializer.EmptySerializer;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 */
public final class StringValueHandler extends EmptySerializer {

    private StringBuilder _buffer = new StringBuilder();
    private String _str = null;
    private static final String EMPTY_STR = "";
    private boolean m_escaping = false;
    private int _nestedLevel = 0;
	
    public void characters(char[] ch, int off, int len) 
	throws SAXException 
    {
	if (_nestedLevel > 0)
	    return;
	
	if (_str != null) {
	    _buffer.append(_str);
	    _str = null;
	}
	_buffer.append(ch, off, len);
    }

    public String getValue() {
	if (_buffer.length() != 0) {
	    String result = _buffer.toString();
	    _buffer.setLength(0);
	    return result;
	}
	else {
	    String result = _str;
	    _str = null;
	    return (result != null) ? result : EMPTY_STR;
	}
    }

    public void characters(String characters) throws SAXException {
	if (_nestedLevel > 0)
	    return;

	if (_str == null && _buffer.length() == 0) {
	    _str = characters;
	}
	else {
	    if (_str != null) {
	        _buffer.append(_str);
	        _str = null;
	    }
	    
	    _buffer.append(characters);
	}
    }
    
    public void startElement(String qname) throws SAXException {
        _nestedLevel++;
    }

    public void endElement(String qname) throws SAXException {
        _nestedLevel--;
    }

    // Override the setEscaping method just to indicate that this class is
    // aware that that method might be called.
    public boolean setEscaping(boolean bool) {
        boolean oldEscaping = m_escaping;
        m_escaping = bool;

        return bool;
    }

    /**
     * The value of a PI must not contain the substring "?>". Should
     * that substring be present, replace it by "? >". 
     */
    public String getValueOfPI() {
	final String value = getValue();

	if (value.indexOf("?>") > 0) {
	    final int n = value.length(); 
	    final StringBuilder valueOfPI = new StringBuilder();

	    for (int i = 0; i < n;) {
		final char ch = value.charAt(i++);
		if (ch == '?' && value.charAt(i) == '>') {
		    valueOfPI.append("? >"); i++;
		}
		else {
		    valueOfPI.append(ch);
		}
	    } 
	    return valueOfPI.toString();
	}
	return value;
    }
}