com.github.nmorel.gwtjackson.guava.client.deser.ImmutableSetJsonDeserializer.java Source code

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Here is the source code for com.github.nmorel.gwtjackson.guava.client.deser.ImmutableSetJsonDeserializer.java

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/*
 * Copyright 2013 Nicolas Morel
 *
 * 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.github.nmorel.gwtjackson.guava.client.deser;

import com.github.nmorel.gwtjackson.client.JsonDeserializationContext;
import com.github.nmorel.gwtjackson.client.JsonDeserializer;
import com.github.nmorel.gwtjackson.client.JsonDeserializerParameters;
import com.github.nmorel.gwtjackson.client.stream.JsonReader;
import com.google.common.collect.ImmutableSet;

/**
 * Default {@link JsonDeserializer} implementation for {@link ImmutableSet}.
 *
 * @param <T> Type of the elements inside the {@link ImmutableSet}
 *
 * @author Nicolas Morel
 */
public final class ImmutableSetJsonDeserializer<T>
        extends BaseImmutableCollectionJsonDeserializer<ImmutableSet<T>, T> {

    /**
     * @param deserializer {@link JsonDeserializer} used to deserialize the objects inside the {@link ImmutableSet}.
     * @param <T> Type of the elements inside the {@link ImmutableSet}
     *
     * @return a new instance of {@link ImmutableSetJsonDeserializer}
     */
    public static <T> ImmutableSetJsonDeserializer<T> newInstance(JsonDeserializer<T> deserializer) {
        return new ImmutableSetJsonDeserializer<T>(deserializer);
    }

    private ImmutableSet.Builder<T> currentBuilder;

    /**
     * @param deserializer {@link JsonDeserializer} used to deserialize the objects inside the {@link ImmutableSet}.
     */
    private ImmutableSetJsonDeserializer(JsonDeserializer<T> deserializer) {
        super(deserializer);
    }

    @Override
    protected ImmutableSet<T> doDeserialize(JsonReader reader, JsonDeserializationContext ctx,
            JsonDeserializerParameters params) {
        try {
            currentBuilder = ImmutableSet.builder();
            buildCollection(reader, ctx, params);
            return currentBuilder.build();
        } finally {
            currentBuilder = null;
        }
    }

    @Override
    protected void addToCollection(T element) {
        currentBuilder.add(element);
    }
}