org.canova.api.berkeley.MapFactory Maven / Gradle / Ivy
/*
*
* *
* * * Copyright 2015 Skymind,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.canova.api.berkeley;
import java.io.Serializable;
import java.util.*;
/**
* The MapFactory is a mechanism for specifying what kind of map is to be used
* by some object. For example, if you want a Counter which is backed by an
* IdentityHashMap instead of the defaul HashMap, you can pass in an
* IdentityHashMapFactory.
*
* @author Dan Klein
*/
public abstract class MapFactory implements Serializable {
public static class HashMapFactory extends MapFactory {
private static final long serialVersionUID = 1L;
public Map buildMap() {
return new HashMap<>();
}
}
public static class IdentityHashMapFactory extends MapFactory {
private static final long serialVersionUID = 1L;
public Map buildMap() {
return new IdentityHashMap<>();
}
}
public static class TreeMapFactory extends MapFactory {
private static final long serialVersionUID = 1L;
public Map buildMap() {
return new TreeMap<>();
}
}
public static class WeakHashMapFactory extends MapFactory {
private static final long serialVersionUID = 1L;
public Map buildMap() {
return new WeakHashMap<>();
}
}
public abstract Map buildMap();
}