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 }