org.jclouds.http.functions.UnwrapOnlyNestedJsonValueInSet.java Source code

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Here is the source code for org.jclouds.http.functions.UnwrapOnlyNestedJsonValueInSet.java

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * 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.jclouds.http.functions;

import java.util.Set;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.http.HttpResponse;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;

/**
 * @author Adrian Cole
 */
@Singleton
public class UnwrapOnlyNestedJsonValueInSet<T> implements Function<HttpResponse, T> {

    private final UnwrapOnlyNestedJsonValue<Set<T>> json;

    @Inject
    UnwrapOnlyNestedJsonValueInSet(UnwrapOnlyNestedJsonValue<Set<T>> json) {
        this.json = json;
    }

    @Override
    public T apply(HttpResponse arg0) {
        Set<T> set = json.apply(arg0);
        if (set == null || set.size() == 0)
            return null;
        return Iterables.getOnlyElement(set);
    }
}