/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", "Jexl" and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.commons.jexl.parser;

import org.apache.commons.jexl.JexlContext;
import org.apache.commons.jexl.util.Coercion;
import org.apache.commons.jexl.util.Introspector;
import org.apache.velocity.util.introspection.VelPropertyGet;
import org.apache.velocity.util.introspection.Info;

import java.util.List;
import java.util.Map;
import java.lang.reflect.Array;


/**
 *  Like an ASTIdentifier, but with array access allowed
 *
 *    $foo[2]
 *
 *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 *  @version $Id: ASTArrayAccess.java,v 1.1 2002/04/26 04:23:14 geirm Exp $
 */
public class ASTArrayAccess extends SimpleNode
{
    public ASTArrayAccess(int id)
    {
        super(id);
    }

    public ASTArrayAccess(Parser p, int id)
    {
        super(p, id);
    }


    /** Accept the visitor. **/
    public Object jjtAccept(ParserVisitor visitor, Object data)
    {
        return visitor.visit(this, data);
    }

    /**
     *  return the value of this node
     */
    public Object value(JexlContext jc)
        throws Exception
    {
        /*
         * get the base ASTIdentifier
         */

        ASTIdentifier base = (ASTIdentifier) jjtGetChild(0);

        Object o = base.value(jc);

        SimpleNode arg = (SimpleNode) jjtGetChild(1);
        Object loc = arg.value(jc);

        /*
         * following the JSTL EL rules
         */

        if (o == null)
            return null;

        if (loc == null)
            return null;

        if (o instanceof Map)
        {
            if (!((Map)o).containsKey(loc))
                return null;

            return ((Map)o).get(loc);
        }
        else if (o instanceof List)
        {
            int idx = Coercion.coerceInteger(loc).intValue();

            try
            {
                return ((List)o).get(idx);
            }
            catch(IndexOutOfBoundsException iobe)
            {
                return null;
            }
        }
        else if (o.getClass().isArray())
        {
            int idx = Coercion.coerceInteger(loc).intValue();

            try
            {
                return Array.get(o, idx);
            }
            catch(ArrayIndexOutOfBoundsException aiobe)
            {
                return null;
            }
        }
        else
        {
            /*
             *  "Otherwise (a JavaBean object)..."  huh? :)
             */

            String s = loc.toString();

            VelPropertyGet vg = Introspector.getUberspect().getPropertyGet(o,s,new Info("",1,1));

            if (vg != null)
            {
                return vg.invoke(o);
            }
        }

        throw new Exception("Unsupported object type for array [] accessor");
    }

    public String getIdentifierString()
    {
        return ((ASTIdentifier) jjtGetChild(0)).getIdentifierString();
    }
}

@@ -3146,29 +3146,29 @@
 v 1.
-1
+2
  2002/0
-4/26 04:23:14
+5/25 18:39:02
  gei
@@ -3823,25 +3823,164 @@
     
-SimpleNode arg = 
+/*%0A         * ignore the first child - it's our identifier%0A         */%0A        for(int i=1; i%3CjjtGetNumChildren(); i++)%0A        %7B%0A            Object loc = (
 (Sim
@@ -4004,20 +4004,32 @@
 ild(
-1
+i)).value(jc
 );%0A
+%0A
         
 Obje
@@ -4028,36 +4028,220 @@
     
-Object loc = arg.value(jc);%0A
+    if(loc==null)%0A                return null;%0A%0A            o = evaluateExpr(o, loc);%0A        %7D%0A%0A        return o;%0A    %7D%0A%0A    public static Object evaluateExpr(Object o, Object loc)%0A        throws Exception%0A    %7B
 %0A   

Support multi-dim access