services/src/main/java/org/apache/unomi/services/mergers/MostRecentPropertyMergeStrategyExecutor.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.unomi.services.mergers;

import org.apache.unomi.api.Profile;
import org.apache.unomi.api.PropertyMergeStrategyExecutor;
import org.apache.unomi.api.PropertyType;

import java.util.List;

public class MostRecentPropertyMergeStrategyExecutor implements PropertyMergeStrategyExecutor {
    public boolean mergeProperty(String propertyName, PropertyType propertyType, List<Profile> profilesToMerge, Profile targetProfile) {
        Object result = null;
        int i = profilesToMerge.size() - 1;
        while (result == null && i >=0) {
            result = profilesToMerge.get(i).getProperty(propertyName);
            i--;
        }
        if (result != null && (targetProfile.getProperty(propertyName) == null || !result.equals(targetProfile.getProperty(propertyName)))) {
            targetProfile.setProperty(propertyName, result);
            return true;
        }
        return false;
    }
}