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 import org.picocontainer.PicoVisitor; 013 import org.picocontainer.parameters.CollectionComponentParameter; 014 015 /** 016 * Constraint that collects/aggregates dependencies to as many components 017 * that satisfy the given constraint. 018 * 019 * @author Nick Sieger 020 * @author Jörg Schaible 021 */ 022 @SuppressWarnings("serial") 023 public final class CollectionConstraint extends CollectionComponentParameter implements Constraint { 024 025 protected final Constraint constraint; 026 027 public CollectionConstraint(final Constraint constraint) { 028 this(constraint, false); 029 } 030 031 public CollectionConstraint(final Constraint constraint, final boolean emptyCollection) { 032 super(Object.class, emptyCollection); 033 this.constraint = constraint; 034 } 035 036 @Override 037 public boolean evaluate(final ComponentAdapter adapter) { 038 return constraint.evaluate(adapter); 039 } 040 041 @Override 042 public void accept(final PicoVisitor visitor) { 043 super.accept(visitor); 044 constraint.accept(visitor); 045 } 046 }