/*
 * Copyright 2014 Adam Peck.
 *
 * 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 com.dampcake.gson.immutable;

import static com.google.common.base.Preconditions.checkState;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;

import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.ImmutableSortedSet;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;

/**
 * {@link TypeAdapterFactory} for de-serializing Gson Immutable types.
 * 
 * @author Adam Peck
 */
public final class ImmutableAdapterFactory implements TypeAdapterFactory {

	private static final Map<Class, Class> interfaceMap = ImmutableMap.<Class, Class>builder()
			.put(ImmutableCollection.class, Collection.class)
			.put(ImmutableList.class, List.class)
			.put(ImmutableSet.class, Set.class)
			.put(ImmutableSortedSet.class, SortedSet.class)
			.put(ImmutableMap.class, Map.class)
			.put(ImmutableSortedMap.class, SortedMap.class)
			.build();
	
	private final Map<Class, Class<? extends TypeAdapter>> adapters;

	private ImmutableAdapterFactory(Map<Class, Class<? extends TypeAdapter>> adapters) {
		this.adapters = adapters;
	}

	/**
	 * Creates a {@link TypeAdapterFactory} for de-serializing Immutable types specified
	 * by their interfaces.
	 * 
	 * @return the created {@link TypeAdapterFactory}.
	 */
	public static TypeAdapterFactory forGuava() {
		return new ImmutableAdapterFactory(ImmutableMap.<Class, Class<? extends TypeAdapter>>builder()
				.put(ImmutableCollection.class, ImmutableCollectionAdapter.class)
				.put(ImmutableList.class, ImmutableListAdapter.class)
				.put(ImmutableSet.class, ImmutableSetAdapter.class)
				.put(ImmutableSortedSet.class, ImmutableSortedSetAdapter.class)
				.put(ImmutableMap.class, ImmutableMapAdapter.class)
				.put(ImmutableSortedMap.class, ImmutableSortedMapAdapter.class)
				.build());
	}
	
	/**
	 * Creates a {@link TypeAdapterFactory} for de-serializing Immutable types specified
	 * by Java interfaces.
	 * 
	 * @return the created {@link TypeAdapterFactory}.
	 */
	public static TypeAdapterFactory forInterfaces() {
		return new ImmutableAdapterFactory(ImmutableMap.<Class, Class<? extends TypeAdapter>>builder()
				.put(Collection.class, ImmutableCollectionAdapter.class)
				.put(List.class, ImmutableListAdapter.class)
				.put(Set.class, ImmutableSetAdapter.class)
				.put(SortedSet.class, ImmutableSortedSetAdapter.class)
				.put(Map.class, ImmutableMapAdapter.class)
				.put(SortedMap.class, ImmutableSortedMapAdapter.class)
				.build());
	}

	/**
	 * @see TypeAdapterFactory#create(Gson, TypeToken) 
	 */
	@Override
	@SuppressWarnings("unchecked")
	public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
		if (adapters.containsKey(type.getRawType())) {
			TypeAdapter delegate = getDelegate(gson, type);
			try {
				return adapters.get(type.getRawType()).getConstructor(TypeAdapter.class).newInstance(delegate);
			} catch (Exception e) {
				return null;
			}
		}
		return null;
	}

	private <T> TypeAdapter getDelegate(Gson gson, TypeToken<T> type) {
		Class<?> iface = type.getRawType();
		
		if (!iface.isInterface())
			iface = interfaceMap.get(iface);

		checkState(iface == null, "Non-mappable type found");
		return gson.getDelegateAdapter(this, TypeToken.get(iface));
	}
}
@@ -4074,17 +4074,17 @@
 e(iface 
-=
+!
 = null, 

Test code accidentally committed.