com.b2international.snowowl.snomed.reasoner.server.diff.OntologyChangeOrdering.java Source code

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Here is the source code for com.b2international.snowowl.snomed.reasoner.server.diff.OntologyChangeOrdering.java

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/*
 * Copyright 2011-2015 B2i Healthcare Pte Ltd, http://b2i.sg
 * 
 * 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 com.b2international.snowowl.snomed.reasoner.server.diff;

import com.google.common.collect.Ordering;

/**
 * Ordering implementation for ontology changes of arbitrary subjects; orders additions in front of removals, placing
 * null values at the end.
 * 
 */
public final class OntologyChangeOrdering extends Ordering<OntologyChange<?>> {

    public static final Ordering<OntologyChange<?>> INSTANCE = new OntologyChangeOrdering().nullsLast();

    private OntologyChangeOrdering() {
        // This class should not be instantiated.
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.Ordering#compare(java.lang.Object, java.lang.Object)
     */
    @Override
    public int compare(final OntologyChange<?> o1, final OntologyChange<?> o2) {
        return o1.getNature().compareTo(o2.getNature());
    }
}