//--------------------------------------------------------------------------
//	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 ariba.util.expr;

import java.util.*;

/**
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
class ASTMap extends SimpleNode
{
    private static Class    DEFAULT_MAP_CLASS;
    private String          className;

    static {
        /* Try to get LinkedHashMap; if older JDK than 1.4 use HashMap */
        try {
            DEFAULT_MAP_CLASS = Class.forName("java.util.LinkedHashMap");
        } catch (ClassNotFoundException ex) {
            DEFAULT_MAP_CLASS = HashMap.class;
        }
    }

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

    public ASTMap(ExprParser p, int id) {
        super(p, id);
    }

    protected void setClassName(String value)
    {
        className = value;
    }

    protected Object getValueBody( ExprContext context, Object source ) throws ExprException
    {
        Map answer;

        if (className == null) {
            try {
                answer = (Map)DEFAULT_MAP_CLASS.newInstance();
            } catch (Exception ex) {
                /* This should never happen */
                throw new ExprException("Default Map class '" + DEFAULT_MAP_CLASS.getName() + "' instantiation error", ex);
            }
        } else {
            try {
                answer = (Map)ExprRuntime.classForName(context, className).newInstance();
            } catch (Exception ex) {
                throw new ExprException("Map implementor '" + className + "' not found", ex);
            }
        }

        for ( int i=0; i < jjtGetNumChildren(); ++i ) {
            ASTKeyValue     kv = (ASTKeyValue)children[i];
            Node            k = kv.getKey(),
                            v = kv.getValue();

            answer.put( k.getValue(context, source), (v == null) ? null : v.getValue(context, source) );
        }
        return answer;
    }

    public String toString()
    {
        String      result = "[";

        if (className != null) {
            result = result + "@" + className + "@";
        }
        for ( int i = 0; i < jjtGetNumChildren(); ++i ) {
            ASTKeyValue     kv = (ASTKeyValue)children[i];

            if (i > 0) {
                result = result + ", ";
            }
            result = result + kv.getKey() + " : " + kv.getValue();
        }
        return result + "]";
    }

    public void accept (ASTNodeVisitor visitor)
    {
        acceptChildren(visitor);
        visitor.visit(this);
    }
}