com.cedarsoftware.io.factory.EmptyFactory Maven / Gradle / Ivy

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Java JSON serialization
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package com.cedarsoftware.io.factory;

import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;

import com.cedarsoftware.io.JsonIoException;
import com.cedarsoftware.io.JsonObject;
import com.cedarsoftware.io.JsonReader;
import com.cedarsoftware.io.Resolver;

/**
 * @author John DeRegnaucourt ([email protected])
 *         

 *         Copyright (c) Cedar Software LLC
 *         


 *         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
 *         


 *         License
 *         


 *         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.
 */
public class EmptyFactory implements JsonReader.ClassFactory {
    public Object newInstance(Class c, JsonObject jObj, Resolver resolver) {
        if (NavigableSet.class.isAssignableFrom(c)) {
            return Collections.emptyNavigableSet();
        } else if (SortedSet.class.isAssignableFrom(c)) {
            return Collections.emptySortedSet();
        } else if (Set.class.isAssignableFrom(c)) {
            return Collections.emptySet();
        } else if (List.class.isAssignableFrom(c) || Collection.class.isAssignableFrom(c)) {
            return Collections.emptyList();
        } else if (NavigableMap.class.isAssignableFrom(c)) {
            return Collections.emptyNavigableMap();
        } else if (SortedMap.class.isAssignableFrom(c)) {
            return Collections.emptySortedMap();
        } else if (Map.class.isAssignableFrom(c)) {
            return Collections.emptyMap();
        } else if (ListIterator.class.isAssignableFrom(c)) {
            return Collections.emptyListIterator();
        } else if (Iterator.class.isAssignableFrom(c)) {
            return Collections.emptyIterator();
        } else if (Enumeration.class.isAssignableFrom(c)) {
            return Collections.emptyEnumeration();
        }
        throw new JsonIoException("EmptyFactory handed Class for which it was not expecting: " + c.getName());
    }
}