/**
 * Copyright 2010 JBoss Inc
 *
 * 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 org.drools.rule;

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

import org.drools.definition.type.FactField;
import org.drools.definition.type.FactType;

/**
 * DO NOT USE THIS YET. Use FactType instead.
 *
 * @author michaelneale
 *
 */
public class DynamicFact implements Map<String, Object> {

	private Object bean;
	private FactType typeDef;

	public DynamicFact(Object bean, FactType typeDef) {
		this.bean = bean;
		this.typeDef = typeDef;
	}

	public void clear() {
		throw new UnsupportedOperationException();
	}

	public boolean containsKey(Object key) {
		return this.typeDef.getField((String) key) != null;
	}

	public boolean containsValue(Object arg0) {
		throw new UnsupportedOperationException();
	}

	public Set entrySet() {

		Set set = new HashSet();

		List<FactField> list = this.typeDef.getFields();
		for (FactField factField : list) {
			final FactField ff = factField;
			Map.Entry<String, Object> ent = new Map.Entry<String, Object>() {

				public String getKey() {
					return ff.getName();
				}

				public Object getValue() {
					return typeDef.get(bean, ff.getName());
				}

				public Object setValue(Object o) {
					typeDef.set(bean, ff.getName(), o);
					return o;
				}

			};
		}

		return set;

	}

	public Object get(Object fieldName) {
		return this.typeDef.get(bean, (String) fieldName);
	}

	public boolean isEmpty() {
		return this.typeDef.getFields().size() == 0;
	}

	public Set<String> keySet() {
		throw new UnsupportedOperationException();
	}

	public Object put(String key, Object value) {
		Object old = this.typeDef.get(bean, key);
		this.typeDef.set(this.bean, key, value);
		return old;
	}

	public void putAll(Map arg0) {
		throw new UnsupportedOperationException();
	}

	public Object remove(Object arg0) {
		throw new UnsupportedOperationException();	}

	public int size() {
		return this.typeDef.getFields().size();
	}

	public Collection values() {
		throw new UnsupportedOperationException();
	}

	/**
	 * Return the underlying fact itself. This is what you asset into the session/engine.
	 */
	public Object getFactObject() {
		return this.bean;
	}



}