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Groovy example source code file (BytecodeSequence.java)

This example Groovy source code file (BytecodeSequence.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

arraylist, astnode, bytecodesequence, bytecodesequence, classgenerator, classgenerator, iterator, list, list, object, object, statement, util

The Groovy BytecodeSequence.java source code

/*
 * 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.ASTNode;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
import org.codehaus.groovy.ast.stmt.Statement;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * This class represents a sequence of BytecodeInstructions
 * or ASTNodes. The evaluation is depending on the type of 
 * the visitor.
 * 
 * @see BytecodeInstruction
 * @see ASTNode
 */

public class BytecodeSequence extends Statement {
    private final List<BytecodeInstruction> instructions;

    public BytecodeSequence(List instructions) {
        this.instructions = instructions;
    }
    
    public BytecodeSequence(BytecodeInstruction instruction) {
        this.instructions = new ArrayList(1);
        this.instructions.add(instruction);
    }

    /**
     * Delegates to the visit method used for this class.
     * If the visitor is a ClassGenerator, then 
     * {@link ClassGenerator#visitBytecodeSequence(BytecodeSequence)}
     * is called with this instance. If the visitor is no 
     * ClassGenerator, then this method will call visit on
     * each ASTNode element sorted by this class. If one
     * element is a BytecodeInstruction, then it will be skipped
     * as it is no ASTNode. 
     * 
     * @param visitor the visitor
     * @see ClassGenerator
     */
    public void visit(GroovyCodeVisitor visitor) {
        if (visitor instanceof ClassGenerator) {
            ClassGenerator gen = (ClassGenerator) visitor;
            gen.visitBytecodeSequence(this);
            return;
        }
        for (Iterator iterator = instructions.iterator(); iterator.hasNext();) {
            Object part = (Object) iterator.next();
            if (part instanceof ASTNode) {
                ((ASTNode)part).visit(visitor);
            }
        }
    }

    public List getInstructions() {
        return instructions;
    }

}

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