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
009package org.picocontainer.gems.constraints;
010
011import org.picocontainer.ComponentAdapter;
012import org.picocontainer.PicoVisitor;
013import 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")
023public 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}