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: NamespaceUriCall.java 468650 2006-10-28 07:03:30Z minchau $
020     */
021    
022    package org.apache.xalan.xsltc.compiler;
023    
024    import java.util.Vector;
025    
026    import org.apache.bcel.generic.ConstantPoolGen;
027    import org.apache.bcel.generic.INVOKEINTERFACE;
028    import org.apache.bcel.generic.InstructionList;
029    import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
030    import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
031    
032    /**
033     * @author Morten Jorgensen
034     */
035    final class NamespaceUriCall extends NameBase {
036    
037        /**
038         * Handles calls with no parameter (current node is implicit parameter).
039         */
040        public NamespaceUriCall(QName fname) {
041            super(fname);
042        }
043    
044        /**
045         * Handles calls with one parameter (either node or node-set).
046         */
047        public NamespaceUriCall(QName fname, Vector arguments) {
048            super(fname, arguments);
049        }
050    
051        /**
052         * Translate code that leaves a node's namespace URI (as a String)
053         * on the stack
054         */
055        public void translate(ClassGenerator classGen,
056                              MethodGenerator methodGen) {
057            final ConstantPoolGen cpg = classGen.getConstantPool();
058            final InstructionList il = methodGen.getInstructionList();
059    
060            // Returns the string value for a node in the DOM
061            final int getNamespace = cpg.addInterfaceMethodref(DOM_INTF,
062                                                               "getNamespaceName",
063                                                               "(I)"+STRING_SIG);
064            super.translate(classGen, methodGen);
065            il.append(new INVOKEINTERFACE(getNamespace, 2));
066        }
067    }