/*
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.flex.compiler.internal.tree.as;

import java.util.ArrayList;

import org.apache.flex.compiler.parsing.IASToken;
import org.apache.flex.compiler.tree.ASTNodeID;
import org.apache.flex.compiler.tree.as.IASNode;
import org.apache.flex.compiler.tree.as.IConditionalNode;
import org.apache.flex.compiler.tree.as.IExpressionNode;
import org.apache.flex.compiler.tree.as.ISwitchNode;
import org.apache.flex.compiler.tree.as.ITerminalNode;

/**
 * Represents a switch statement found in ActionScript. A switch has a
 * condition, and each branch is a case statement with a given label. If the
 * condition matches any of the case statements, the code within will be
 * executed.
 */
public class SwitchNode extends ConditionalNode implements ISwitchNode
{
    /**
     * Constructor.
     * 
     * @param keyword The token representing the <code>switch</code> keyword.
     */
    public SwitchNode(IASToken keyword)
    {
        super(keyword);
    }
    
    //
    // NodeBase overrides
    //

    @Override
    public ASTNodeID getNodeID()
    {
        return ASTNodeID.SwitchID;
    }
    
    //
    // ConditionalNode overrides
    //

    @Override
    public IExpressionNode getConditionalExpressionNode()
    {
        IASNode child = getConditionalNode();
        if (child instanceof ConditionalNode)
            return ((ConditionalNode)child).getConditionalExpressionNode();
        
        return null;
    }
    
    //
    // ISwitchNode implementations
    //

    @Override
    public IConditionalNode[] getCaseNodes()
    {
        int childCount = getChildCount();
        ArrayList<IConditionalNode> retVal = new ArrayList<IConditionalNode>(childCount);
        
        for (int i = 1; i < childCount; i++)
        {
            IASNode child = getChild(i);
            if (child instanceof IConditionalNode)
                retVal.add((IConditionalNode)child);
        }
        
        return retVal.toArray(new IConditionalNode[0]);
    }

    @Override
    public ITerminalNode getDefaultNode()
    {
        int childCount = getChildCount();
        for (int i = childCount - 1; i >= 0; i--)
        {
            IASNode child = getChild(i);
            if (child instanceof ITerminalNode)
                return (ITerminalNode)child;
        }
        
        return null;
    }
}