    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
    014    /**
    015     * Aggregates multiple constraints together using boolean AND logic.
    016     * Constraints are short-circuited as in java.
    017     *
    018     * @author Nick Sieger
    019     */
    020    @SuppressWarnings("serial")
    021    public final class And extends AbstractConstraint {
    022            private final Constraint[] children;
    023
    024        public And(final Constraint c1, final Constraint c2) {
    025            children = new Constraint[2];
    026            children[0] = c1;
    027            children[1] = c2;
    028        }
    029
    030        public And(final Constraint c1, final Constraint c2, final Constraint c3) {
    031            children = new Constraint[3];
    032            children[0] = c1;
    033            children[1] = c2;
    034            children[2] = c3;
    035        }
    036
    037        public And(final Constraint[] cc) {
    038            children = new Constraint[cc.length];
    039            System.arraycopy(cc, 0, children, 0, cc.length);
    040        }
    041
    042        @Override
    043            public boolean evaluate(final ComponentAdapter adapter) {
    044            for (Constraint aChildren : children) {
    045                if (!aChildren.evaluate(adapter)) {
    046                    return false;
    047                }
    048            }
    049            return true;
    050        }
    051
    052        @Override
    053            public void accept(final PicoVisitor visitor) {
    054            super.accept(visitor);
    055            for (Constraint aChildren : children) {
    056                aChildren.accept(visitor);
    057            }
    058        }
    059    }