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: LangCall.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.ILOAD;
028 import org.apache.bcel.generic.INVOKESTATIC;
029 import org.apache.bcel.generic.InstructionList;
030 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
031 import org.apache.xalan.xsltc.compiler.util.FilterGenerator;
032 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
033 import org.apache.xalan.xsltc.compiler.util.StringType;
034 import org.apache.xalan.xsltc.compiler.util.Type;
035 import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
036
037 /**
038 * @author Morten Jorgensen
039 */
040 final class LangCall extends FunctionCall {
041 private Expression _lang;
042 private Type _langType;
043
044 /**
045 * Get the parameters passed to function:
046 * lang(string)
047 */
048 public LangCall(QName fname, Vector arguments) {
049 super(fname, arguments);
050 _lang = argument(0);
051 }
052
053 /**
054 *
055 */
056 public Type typeCheck(SymbolTable stable) throws TypeCheckError {
057 _langType = _lang.typeCheck(stable);
058 if (!(_langType instanceof StringType)) {
059 _lang = new CastExpr(_lang, Type.String);
060 }
061 return Type.Boolean;
062 }
063
064 /**
065 *
066 */
067 public Type getType() {
068 return(Type.Boolean);
069 }
070
071 /**
072 * This method is called when the constructor is compiled in
073 * Stylesheet.compileConstructor() and not as the syntax tree is traversed.
074 */
075 public void translate(ClassGenerator classGen,
076 MethodGenerator methodGen) {
077 final ConstantPoolGen cpg = classGen.getConstantPool();
078 final InstructionList il = methodGen.getInstructionList();
079
080 final int tst = cpg.addMethodref(BASIS_LIBRARY_CLASS,
081 "testLanguage",
082 "("+STRING_SIG+DOM_INTF_SIG+"I)Z");
083 _lang.translate(classGen,methodGen);
084 il.append(methodGen.loadDOM());
085 if (classGen instanceof FilterGenerator)
086 il.append(new ILOAD(1));
087 else
088 il.append(methodGen.loadContextNode());
089 il.append(new INVOKESTATIC(tst));
090 }
091 }