io.neba.core.util.MatchedBundlesPredicate Maven / Gradle / Ivy

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/*
  Copyright 2013 the original author or authors.

  Licensed under the Apache License, Version 2.0 the "License";
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

package io.neba.core.util;

import org.apache.commons.collections.Predicate;
import org.osgi.framework.Bundle;


/**
 * {@link #evaluate(Object)} returns false if the bundle matches to
 * signal
 * {@link org.apache.commons.collections.CollectionUtils#filter(java.util.Collection, Predicate)}
 * to remove the element it.
 * 
 * Works only on collections of {@link OsgiModelSource}.
 * 
 * @author Olaf Otto
 */
public class MatchedBundlesPredicate implements Predicate {
    private final Bundle bundle;
    private int filteredElements = 0;

    public MatchedBundlesPredicate(Bundle bundle) {
        if (bundle == null) {
            throw new IllegalArgumentException("Method argument bundle must not be null");
        }
        this.bundle = bundle;
    }

    @Override
    public boolean evaluate(Object object) {
        boolean keep = ((OsgiModelSource) object).getBundleId() != bundle.getBundleId();
        if (!keep) {
            ++filteredElements;
        }
        return keep;
    }

    public int getFilteredElements() {
        return filteredElements;
    }
}