001    /*****************************************************************************
002     * Copyright (C) PicoContainer Organization. All rights reserved.            *
003     * ------------------------------------------------------------------------- *
004     * The software in this package is published under the terms of the BSD      *
005     * style license a copy of which has been included with this distribution in *
006     * the LICENSE.txt file.                                                     *
007     *****************************************************************************/
008    
009    package org.picocontainer.gems.constraints;
010    
011    import org.picocontainer.ComponentAdapter;
012    
013    /**
014     * Constraint that accepts an adapter whose key type is either the
015     * same type or a subtype of the type(s) represented by this object.
016     *
017     * @author Nick Sieger
018     * @author Jörg Schaible
019     * @version 1.1
020     */
021    public class IsKeyType extends AbstractConstraint {
022        private Class type;
023    
024        /**
025         * Creates a new <code>IsType</code> instance.
026         *
027         * @param c the <code>Class</code> to match
028         */
029        public IsKeyType(Class c) {
030            this.type = c;
031        }
032    
033        public boolean evaluate(ComponentAdapter adapter) {
034            return type.isAssignableFrom(adapter.getComponentKey().getClass());
035        }
036    
037    }