001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: NodeCounterGenerator.java 468649 2006-10-28 07:00:55Z minchau $
020     */
021    
022    package org.apache.xalan.xsltc.compiler.util;
023    
024    import org.apache.bcel.generic.ALOAD;
025    import org.apache.bcel.generic.Instruction;
026    import org.apache.xalan.xsltc.compiler.Stylesheet;
027    
028    /**
029     * This class implements auxiliary classes needed to compile 
030     * patterns in <tt>xsl:number</tt>. These classes inherit from
031     * {Any,Single,Multiple}NodeCounter and override the 
032     * <tt>matchFrom</tt> and <tt>matchCount</tt> methods.
033     * @author Jacek Ambroziak
034     * @author Santiago Pericas-Geertsen
035     */
036    public final class NodeCounterGenerator extends ClassGenerator {
037        private Instruction _aloadTranslet;
038    
039        public NodeCounterGenerator(String className, 
040                                    String superClassName,
041                                    String fileName,
042                                    int accessFlags, 
043                                    String[] interfaces,
044                                    Stylesheet stylesheet) {
045            super(className, superClassName, fileName,
046                  accessFlags, interfaces, stylesheet);
047        }
048    
049        /**
050         * Set the index of the register where "this" (the pointer to
051         * the translet) is stored.
052         */
053        public void setTransletIndex(int index) {
054            _aloadTranslet = new ALOAD(index);
055        }
056    
057        /**
058         * The index of the translet pointer within the execution of
059         * matchFrom or matchCount.
060         * Overridden from ClassGenerator.
061         */
062        public Instruction loadTranslet() {
063            return _aloadTranslet;
064        }
065        
066        /**
067         * Returns <tt>true</tt> since this class is external to the
068         * translet.
069         */
070        public boolean isExternal() {
071            return true;
072        }
073    }