/*--

 * Copyright 2010 René M. de Bloois

 *

 * 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 solidstack.query;



import java.io.Serializable;

import java.util.Collection;

import java.util.Map;

import java.util.Set;



import solidstack.util.ObjectArrayList;



/**

 * Decorates an {@link Object} array to let it look like a {@link Map}.

 * 

 * @author René M. de Bloois

 */

public class ValuesMap implements Map< String, Object >, Serializable

{

	private static final long serialVersionUID = 1L;



	private Map< String, Integer > names; // This one is shared by all instances

	private Object[] values;



	/**

	 * Constructor.

	 * 

	 * @param names The names and indexes of the elements in the {@link Object} array.

	 * @param values The values.

	 */

	public ValuesMap( Map< String, Integer > names, Object[] values )

	{

		this.names = names;

		this.values = values;

	}



	public int size()

	{

		return this.values.length;

	}



	public boolean isEmpty()

	{

		return this.values.length == 0;

	}



	public boolean containsKey( Object key )

	{

		if( !( key instanceof String ) )

			throw new IllegalArgumentException( "Expecting a string" );

		String k = ( (String)key ).toLowerCase();

		return this.names.containsKey( k );

	}



	public Object get( Object key )

	{

		if( !( key instanceof String ) )

			throw new IllegalArgumentException( "Expecting a string" );

		String k = ( (String)key ).toLowerCase();

		Integer index = this.names.get( k );

		if( index == null )

			throw new IllegalArgumentException( "Unknown column name: " + key );

		return this.values[ index ];

	}



	public Set< String > keySet()

	{

		return this.names.keySet();

	}



	public Collection< Object > values()

	{

		return new ObjectArrayList( this.values );

	}



	public boolean containsValue( Object value )

	{

		throw new UnsupportedOperationException();

	}



	public Object put( String key, Object value )

	{

		throw new UnsupportedOperationException();

	}



	public Object remove( Object key )

	{

		throw new UnsupportedOperationException();

	}



	public void putAll( Map< ? extends String, ? extends Object > m )

	{

		throw new UnsupportedOperationException();

	}



	public void clear()

	{

		throw new UnsupportedOperationException();

	}



	public Set< java.util.Map.Entry< String, Object >> entrySet()

	{

		throw new UnsupportedOperationException();

	}

}