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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.Collection;
import java.util.Map;
import java.util.Set;

/**
 * Implementation of PropertyAccessor that sets and gets properties by storing and looking up values
 * in Maps.
 *
 * @author Luke Blanshard ([email protected])
 * @author Drew Davidson ([email protected])
 */
public class MapPropertyAccessor implements PropertyAccessor{

    @Override
    public Object getProperty(Map context,Object target,Object name) throws OgnlException{
        Object result;
        Map map = (Map) target;
        Node currentNode = ((OgnlContext) context).getCurrentNode().jjtGetParent();
        boolean indexedAccess = false;

        if (currentNode == null){
            throw new OgnlException("node is null for '" + name + "'");
        }
        if (!(currentNode instanceof ASTProperty)){
            currentNode = currentNode.jjtGetParent();
        }
        if (currentNode instanceof ASTProperty){
            indexedAccess = ((ASTProperty) currentNode).isIndexedAccess();
        }

        if ((name instanceof String) && !indexedAccess){
            if (name.equals("size")){
                result = new Integer(map.size());
            }else{
                if (name.equals("keys") || name.equals("keySet")){
                    result = map.keySet();
                }else{
                    if (name.equals("values")){
                        result = map.values();
                    }else{
                        if (name.equals("isEmpty")){
                            result = map.isEmpty() ? Boolean.TRUE : Boolean.FALSE;
                        }else{
                            result = map.get(name);
                        }
                    }
                }
            }
        }else{
            result = map.get(name);
        }

        return result;
    }

    @Override
    public void setProperty(Map context,Object target,Object name,Object value) throws OgnlException{
        Map map = (Map) target;
        map.put(name, value);
    }

    @Override
    public String getSourceAccessor(OgnlContext context,Object target,Object index){
        Node currentNode = context.getCurrentNode().jjtGetParent();
        boolean indexedAccess = false;

        if (currentNode == null){
            throw new RuntimeException("node is null for '" + index + "'");
        }

        if (!(currentNode instanceof ASTProperty)){
            currentNode = currentNode.jjtGetParent();
        }

        if (currentNode instanceof ASTProperty){
            indexedAccess = ((ASTProperty) currentNode).isIndexedAccess();
        }

        String indexStr = index.toString();

        context.setCurrentAccessor(Map.class);
        context.setCurrentType(Object.class);

        if (String.class.isInstance(index) && !indexedAccess){
            String key = (indexStr.indexOf('"') >= 0 ? indexStr.replaceAll("\"", "") : indexStr);

            if (key.equals("size")){
                context.setCurrentType(int.class);
                return ".size()";
            }else if (key.equals("keys") || key.equals("keySet")){
                context.setCurrentType(Set.class);
                return ".keySet()";
            }else if (key.equals("values")){
                context.setCurrentType(Collection.class);
                return ".values()";
            }else if (key.equals("isEmpty")){
                context.setCurrentType(boolean.class);
                return ".isEmpty()";
            }
        }

        return ".get(" + indexStr + ")";
    }

    @Override
    public String getSourceSetter(OgnlContext context,Object target,Object index){
        context.setCurrentAccessor(Map.class);
        context.setCurrentType(Object.class);

        String indexStr = index.toString();

        if (String.class.isInstance(index)){
            String key = (indexStr.indexOf('"') >= 0 ? indexStr.replaceAll("\"", "") : indexStr);

            if (key.equals("size")){
                return "";
            }else if (key.equals("keys") || key.equals("keySet")){
                return "";
            }else if (key.equals("values")){
                return "";
            }else if (key.equals("isEmpty")){
                return "";
            }
        }

        return ".put(" + indexStr + ", $3)";
    }
}