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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.
 */
/*
 * $Id: AttributeSet.java 468650 2006-10-28 07:03:30Z minchau $
 */

package org.apache.xalan.xsltc.compiler;

import java.util.Enumeration;
import java.util.Vector;

import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.INVOKESPECIAL;
import org.apache.bcel.generic.InstructionList;
import org.apache.xalan.xsltc.compiler.util.AttributeSetMethodGenerator;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
import org.apache.xalan.xsltc.compiler.util.Util;
import org.apache.xml.utils.XML11Char;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 */
final class AttributeSet extends TopLevelElement {

    // This prefix is used for the method name of attribute set methods
    private static final String AttributeSetPrefix = "$as$";
    
    // Element contents
    private QName            _name;
    private UseAttributeSets _useSets;
    private AttributeSet     _mergeSet;
    private String           _method;
    private boolean          _ignore = false;
    
    /**
     * Returns the QName of this attribute set
     */
    public QName getName() {
	return _name;
    }

    /**
     * Returns the method name of this attribute set. This method name is
     * generated by the compiler (XSLTC)
     */
    public String getMethodName() {
	return _method;
    }

    /**
     * Call this method to prevent a method for being compiled for this set.
     * This is used in case several  elements constitute
     * a single set (with one name). The last element will merge itself with
     * any previous set(s) with the same name and disable the other set(s).
     */
    public void ignore() {
	_ignore = true;
    }

    /**
     * Parse the contents of this attribute set. Recognised attributes are
     * "name" (required) and "use-attribute-sets" (optional).
     */
    public void parseContents(Parser parser) {
	
	// Get this attribute set's name
        final String name = getAttribute("name");
        
        if (!XML11Char.isXML11ValidQName(name)) {
            ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, name, this);
            parser.reportError(Constants.ERROR, err);           
        }        
        _name = parser.getQNameIgnoreDefaultNs(name);
	if ((_name == null) || (_name.equals(EMPTYSTRING))) {
	    ErrorMsg msg = new ErrorMsg(ErrorMsg.UNNAMED_ATTRIBSET_ERR, this);
	    parser.reportError(Constants.ERROR, msg);
	}

	// Get any included attribute sets (similar to inheritance...)
	final String useSets = getAttribute("use-attribute-sets");
	if (useSets.length() > 0) {
            if (!Util.isValidQNames(useSets)) {
                ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, useSets, this);
                parser.reportError(Constants.ERROR, err);	
            }		
	    _useSets = new UseAttributeSets(useSets, parser);
	}

	// Parse the contents of this node. All child elements must be
	//  elements. Other elements cause an error.
	final Vector contents = getContents();
	final int count = contents.size();
	for (int i=0; i