com.b2international.snowowl.snomed.reasoner.server.diff.relationship.StatementFragmentOrdering.java Source code

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Here is the source code for com.b2international.snowowl.snomed.reasoner.server.diff.relationship.StatementFragmentOrdering.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.relationship;

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

/**
 * Compares {@link StatementFragment} instances for change processing. 
 *
 */
public final class StatementFragmentOrdering extends Ordering<StatementFragment> {

    public static final Ordering<StatementFragment> INSTANCE = new StatementFragmentOrdering();

    private StatementFragmentOrdering() {
        // Prevents instantiation
    }

    /*
     * (non-Javadoc)
     * @see com.google.common.collect.Ordering#compare(java.lang.Object, java.lang.Object)
     */
    @Override
    public int compare(final StatementFragment o1, final StatementFragment o2) {

        final int attributeDelta = Longs.compare(o1.getTypeId(), o2.getTypeId());
        if (attributeDelta != 0)
            return attributeDelta;

        final int valueDelta = Longs.compare(o1.getDestinationId(), o2.getDestinationId());
        if (valueDelta != 0)
            return valueDelta;

        final int groupDelta = o1.getGroup() - o2.getGroup();
        if (groupDelta != 0)
            return groupDelta;

        final int unionGroupDelta = o1.getUnionGroup() - o2.getUnionGroup();
        if (unionGroupDelta != 0)
            return unionGroupDelta;

        final int isUniversalDelta = Booleans.compare(o1.isUniversal(), o2.isUniversal());
        if (isUniversalDelta != 0)
            return isUniversalDelta;

        final int isDestinationNegatedDelta = Booleans.compare(o1.isDestinationNegated(),
                o2.isDestinationNegated());
        return isDestinationNegatedDelta;
    }
}