/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed 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.
 */
package org.codehaus.groovy.classgen;

import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.ExpressionTransformer;
import org.objectweb.asm.MethodVisitor;

/**
 * Represents some custom bytecode generation by the compiler
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
 * @version $Revision$
 */
public abstract class BytecodeExpression extends Expression {
    public static final BytecodeExpression NOP = new BytecodeExpression() {
        public void visit(MethodVisitor visitor) {
            //do nothing             
        }
    };

    public BytecodeExpression() {
    }
    
    public BytecodeExpression(ClassNode type) {
        super.setType(type);
    }
    
    public void visit(GroovyCodeVisitor visitor) {
        visitor.visitBytecodeExpression(this);
    }

    public abstract void visit(MethodVisitor mv);

    public Expression transformExpression(ExpressionTransformer transformer) {
        return this;
    }
}