org.ojai.util.Documents.java Source code

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/**
 * Copyright (c) 2016 MapR, 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.ojai.util;

import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

import org.ojai.Document;
import org.ojai.Value;

import com.google.common.collect.Maps;

/**
 * This class contains utility methods for {@link Document} interface.
 */
public class Documents {

    /**
     * Compares two documents for equality.
     * @param d1 the first document to compare
     * @param d2 the second document to compare
     * @return {@code true} if both the documents are equal,
     *         {@code false} otherwise.
     */
    public static boolean equals(Document d1, Document d2) {
        if (d1 == d2) {
            return true; // both are null or same reference
        } else if (d1 == null || d2 == null || d1.size() != d2.size()) {
            return false;
        } else {
            Map<String, Value> keyValues = Maps.newTreeMap();
            Iterator<Entry<String, Value>> i = d2.iterator();
            while (i.hasNext()) {
                Entry<String, Value> e = i.next();
                keyValues.put(e.getKey(), e.getValue());
            }
            Iterator<Entry<String, Value>> j = d1.iterator();
            while (j.hasNext()) {
                Entry<String, Value> e = j.next();
                String k = e.getKey();
                Value v = keyValues.get(k);
                if (v == null || !e.getValue().equals(v)) {
                    return false;
                }
            }
        }
        return true;
    }

}