org.onebusaway.gtfs_transformer.match.ObjectEquality.java Source code

Introduction

Here is the source code for org.onebusaway.gtfs_transformer.match.ObjectEquality.java

Source

/**
 * Copyright (C) 2012 Google, Inc. 
 *
 * 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.onebusaway.gtfs_transformer.match;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.Converter;

public class ObjectEquality {
    public static boolean objectsAreEqual(Object expected, Object actual) {
        boolean nullA = expected == null;
        boolean nullB = actual == null;

        if (nullA && nullB)
            return true;
        if (nullA ^ nullB)
            return false;

        Class<?> expectedType = expected.getClass();
        Class<?> actualType = actual.getClass();

        /**
         * Implementation note: This conversion theoretically will happen over and
         * over with the same value. Is there some way to cache it?
         */
        if (!actualType.isAssignableFrom(expectedType) && expectedType == String.class) {

            Converter converter = ConvertUtils.lookup(actualType);

            if (converter != null) {
                Object converted = converter.convert(actualType, expected);
                if (converted != null)
                    expected = converted;
            }
        }

        return (expected == null && actual == null) || (expected != null && expected.equals(actual));
    }
}