org.diffkit.common.DKElementComparator.java Source code

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Here is the source code for org.diffkit.common.DKElementComparator.java

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/**
 * Copyright 2010-2011 Joseph Panico
 *
 * 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 org.diffkit.common;

import java.util.Comparator;

import org.apache.commons.lang.ClassUtils;
import org.apache.commons.lang.builder.ReflectionToStringBuilder;

/**
 * @author jpanico
 */
public class DKElementComparator<T> implements Comparator<T[]> {
    private final int _lhsIdx;
    private final int _rhsIdx;
    private final Comparator<T> _comparator;

    public DKElementComparator(int lhsIdx_, int rhsIdx_, Comparator<T> comparator_) {
        _lhsIdx = lhsIdx_;
        _rhsIdx = rhsIdx_;
        _comparator = comparator_;
        DKValidate.notNull(_comparator);
    }

    public int compare(T[] lhs_, T[] rhs_) {
        T lhsValue = lhs_[_lhsIdx];
        T rhsValue = rhs_[_rhsIdx];
        boolean lhsNull = (lhsValue == null) ? true : false;
        boolean rhsNull = (rhsValue == null) ? true : false;
        if (lhsNull && rhsNull)
            return 0;
        else if (lhsNull)
            return -1;
        else if (rhsNull)
            return 1;

        return _comparator.compare(lhsValue, rhsValue);
    }

    public String toString() {
        return String.format("%s(%s,%s,%s)", ClassUtils.getShortClassName(this.getClass()), _lhsIdx, _rhsIdx,
                ClassUtils.getShortClassName(_comparator.getClass()));
    }

    public String getDescription() {
        return ReflectionToStringBuilder.toString(this);
    }
}