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//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package com.feilong.lib.ognl;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import com.feilong.lib.ognl.enhance.UnsupportedCompilationException;

/**
 * @author Luke Blanshard ([email protected])
 * @author Drew Davidson ([email protected])
 */
class ASTSelectLast extends SimpleNode{

    /**
     * 
     */
    private static final long serialVersionUID = -2627203543672215754L;

    public ASTSelectLast(int id){
        super(id);
    }

    public ASTSelectLast(OgnlParser p, int id){
        super(p, id);
    }

    @Override
    protected Object getValueBody(OgnlContext context,Object source) throws OgnlException{
        Node expr = _children[0];
        List answer = new ArrayList();
        ElementsAccessor elementsAccessor = OgnlRuntime.getElementsAccessor(OgnlRuntime.getTargetClass(source));

        for (Enumeration e = elementsAccessor.getElements(source); e.hasMoreElements();){
            Object next = e.nextElement();

            if (OgnlOps.booleanValue(expr.getValue(context, next))){
                answer.clear();
                answer.add(next);
            }
        }
        return answer;
    }

    @Override
    public String toString(){
        return "{$ " + _children[0] + " }";
    }

    @Override
    public String toGetSourceString(OgnlContext context,Object target){
        throw new UnsupportedCompilationException("Eval expressions not supported as native java yet.");
    }

    @Override
    public String toSetSourceString(OgnlContext context,Object target){
        throw new UnsupportedCompilationException("Eval expressions not supported as native java yet.");
    }
}