/*

  * Copyright 2002-2009 the original author or authors.

  *

  * Licensed 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 net.sf.json.filters;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.Map;

 import net.sf.json.util.PropertyFilter;

 /**

  * @author Andres Almiray <aalmiray@users.sourceforge.net>

  */

 public abstract class MappingPropertyFilter implements PropertyFilter {

    private Map filters = new HashMap();

    public MappingPropertyFilter() {

       this( null );

    }

    public MappingPropertyFilter( Map filters ) {

       if( filters != null ){

          for( Iterator i = filters.entrySet()

                .iterator(); i.hasNext(); ){

             Map.Entry entry = (Map.Entry) i.next();

             Object key = entry.getKey();

             Object filter = entry.getValue();

             if( filter instanceof PropertyFilter ){

                this.filters.put( key, filter );

             }

          }

       }

    }

    public void addPropertyFilter( Object target, PropertyFilter filter ) {

       if( filter != null ){

          filters.put( target, filter );

       }

    }

    public boolean apply( Object source, String name, Object value ) {

       for( Iterator i = filters.entrySet()

             .iterator(); i.hasNext(); ){

          Map.Entry entry = (Map.Entry) i.next();

          Object key = entry.getKey();

          if( keyMatches( key, source, name, value ) ){

             PropertyFilter filter = (PropertyFilter) entry.getValue();

             return filter.apply( source, name, value );

          }

       }

       return false;

    }

    public void removePropertyFilter( Object target ) {

       if( target != null ){

          filters.remove( target );

       }

    }

    protected abstract boolean keyMatches( Object key, Object source, String name, Object value );

 }