ComparableAttributeFilter.java

/*
 * ====================
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2008-2009 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of the Common Development
 * and Distribution License("CDDL") (the "License").  You may not use this file
 * except in compliance with the License.
 *
 * You can obtain a copy of the License at
 * http://opensource.org/licenses/cddl1.php
 * See the License for the specific language governing permissions and limitations
 * under the License.
 *
 * When distributing the Covered Code, include this CDDL Header Notice in each file
 * and include the License file at http://opensource.org/licenses/cddl1.php.
 * If applicable, add the following below this CDDL Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * ====================
 */
package org.identityconnectors.framework.common.objects.filter;

import org.identityconnectors.common.CollectionUtil;
import org.identityconnectors.framework.common.objects.Attribute;
import org.identityconnectors.framework.common.objects.ConnectorObject;

/**
 * Filter for an attribute value that is comparable.
 */
public abstract class ComparableAttributeFilter extends SingleValueAttributeFilter {

    /**
     * Attempt compare attribute values.
     */
    ComparableAttributeFilter(Attribute attr) {
        super(attr);
        // determine if this attribute value is comparable..
        if (!(getValue() instanceof Comparable)) {
            throw new IllegalArgumentException("Must be a comparable value!");
        }
    }

    /**
     * Call compareTo on the attribute values. If the attribute is not present
     * in the {@link ConnectorObject} return -1.
     */
    public int compare(ConnectorObject obj) {
        int ret = -1;
        Attribute attr = obj.getAttributeByName(getName());
        if (attr != null && attr.getValue().size() == 1) {
            // it must be a comparable because that's were testing against
            if (!(attr.getValue().get(0) instanceof Comparable)) {
                throw new IllegalArgumentException("Attribute value must be comparable!");
            }
            // grab this value and the on from the attribute an compare..
            Object o1 = attr.getValue().get(0);
            Object o2 = getValue();
            ret = CollectionUtil.forceCompare(o1, o2);
        }
        return ret;
    }
}