com.b2international.snowowl.snomed.reasoner.server.diff.concretedomain.ConcreteDomainChangeOrdering.java Source code

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Here is the source code for com.b2international.snowowl.snomed.reasoner.server.diff.concretedomain.ConcreteDomainChangeOrdering.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.concretedomain;

import com.b2international.snowowl.snomed.datastore.ConcreteDomainFragment;
import com.google.common.collect.Ordering;
import com.google.common.primitives.Longs;

/**
 * Compares {@link ConcreteDomainFragment} instances for ontology change processing. 
 *
 */
public final class ConcreteDomainChangeOrdering extends Ordering<ConcreteDomainFragment> {

    public static final Ordering<ConcreteDomainFragment> INSTANCE = new ConcreteDomainChangeOrdering();

    private ConcreteDomainChangeOrdering() {
        // Prevents instantiation
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.Ordering#compare(java.lang.Object, java.lang.Object)
     */
    @Override
    public int compare(final ConcreteDomainFragment left, final ConcreteDomainFragment right) {

        final int typeDelta = left.getType() - right.getType();
        if (typeDelta != 0)
            return typeDelta;

        final int attributeLabelDelta = left.getLabel().compareTo(right.getLabel());
        if (attributeLabelDelta != 0)
            return attributeLabelDelta;

        final int uomDelta = Longs.compare(left.getUomId(), right.getUomId());
        if (uomDelta != 0)
            return uomDelta;

        return left.getValue().compareTo(right.getValue());
    }
}