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: SimpleAttributeValue.java 468650 2006-10-28 07:03:30Z minchau $
020     */
021    
022    package org.apache.xalan.xsltc.compiler;
023    
024    import org.apache.bcel.generic.ConstantPoolGen;
025    import org.apache.bcel.generic.InstructionList;
026    import org.apache.bcel.generic.PUSH;
027    import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
028    import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
029    import org.apache.xalan.xsltc.compiler.util.Type;
030    import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
031    
032    /**
033     * @author Jacek Ambroziak
034     * @author Santiago Pericas-Geertsen
035     */
036    final class SimpleAttributeValue extends AttributeValue {
037    
038        private String _value; // The attributes value (literate string).
039    
040        /**
041         * Creates a new simple attribute value.
042         * @param value the attribute value.
043         */
044        public SimpleAttributeValue(String value) {
045            _value = value;
046        }
047    
048        /**
049         * Returns this attribute value's type (String).
050         * @param stable The compiler/parser's symbol table
051         */
052        public Type typeCheck(SymbolTable stable) throws TypeCheckError {
053            return _type = Type.String;
054        }
055        
056        public String toString() {
057            return _value;
058        }
059            
060        protected boolean contextDependent() {
061            return false;
062        }
063    
064        /**
065         * Translate this attribute value into JVM bytecodes that pushes the
066         * attribute value onto the JVM's stack.
067         * @param classGen BCEL Java class generator
068         * @param methodGen BCEL Java method generator
069         */
070        public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
071            final ConstantPoolGen cpg = classGen.getConstantPool();
072            final InstructionList il = methodGen.getInstructionList();
073            il.append(new PUSH(cpg, _value));
074        }
075    }