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 implementation is either the
015     * same type or a subtype of the type(s) represented by this object.
016     *
017     * @author Nick Sieger
018     */
019    @SuppressWarnings("serial")
020    public final class IsType extends AbstractConstraint {
021            private final Class type;
022    
023        /**
024         * Creates a new <code>IsType</code> instance.
025         *
026         * @param c the <code>Class</code> to match
027         */
028        public IsType(final Class c) {
029            this.type = c;
030        }
031    
032        @Override
033            public boolean evaluate(final ComponentAdapter adapter) {
034            return type.isAssignableFrom(adapter.getComponentImplementation());
035        }
036    
037    }