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/*
 * 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 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;
    }

}