/*
* 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.streams.verbs;
import org.apache.streams.pojo.json.Activity;
import org.apache.streams.pojo.json.ActivityObject;
import com.google.common.collect.Ordering;
/**
* Orders ObjectCombinations from most specific to most general, in context of
* degree of match to a specified Activity.
*/
public class ObjectCombinationSpecificOrdering extends Ordering<ObjectCombination> {
private Activity activity;
public ObjectCombinationSpecificOrdering(Activity activity) {
this.activity = activity;
}
@Override
public int compare(ObjectCombination left, ObjectCombination right) {
if (matchCount(left) < matchCount(right)) {
return 1;
} else if ( matchCount(left) > matchCount(right)) {
return -1;
} else if ( !match(activity.getActor(), left.getActor()) && match(activity.getActor(), right.getActor())) {
return 1;
} else if ( match(activity.getActor(), left.getActor()) && !match(activity.getActor(), right.getActor())) {
return -1;
} else if ( !match(activity.getObject(), left.getObject()) && match(activity.getObject(), right.getObject())) {
return 1;
} else if ( match(activity.getObject(), left.getObject()) && !match(activity.getObject(), right.getObject())) {
return -1;
} else if ( !match(activity.getTarget(), left.getTarget()) && match(activity.getTarget(), right.getTarget())) {
return 1;
} else if ( match(activity.getTarget(), left.getTarget()) && !match(activity.getTarget(), right.getTarget())) {
return -1;
} else if ( !match(activity.getProvider(), left.getProvider()) && match(activity.getTarget(), right.getProvider())) {
return 1;
} else if ( match(activity.getProvider(), left.getProvider()) && !match(activity.getTarget(), right.getProvider())) {
return -1;
} else {
return 0;
}
}
/**
* count matches between this ObjectCombination and this Activity.
* @param objectCombination ObjectCombination
* @return count
*/
private int matchCount(ObjectCombination objectCombination) {
int matchCount = 0;
if ( match(activity.getActor(), objectCombination.getActor())) {
matchCount++;
}
if ( match(activity.getObject(), objectCombination.getObject())) {
matchCount++;
}
if ( match(activity.getTarget(), objectCombination.getTarget())) {
matchCount++;
}
if ( match(activity.getProvider(), objectCombination.getProvider())) {
matchCount++;
}
return matchCount;
}
/**
* whether this ActivityObject matches the corresponding ObjectCombination pattern.
* @param activityObject ActivityObject
* @param pattern pattern
* @return true or false
*/
public boolean match(ActivityObject activityObject, String pattern) {
return activityObject != null
&& activityObject.getObjectType() != null
&& activityObject.getObjectType().equals(pattern);
}
}