org.jclouds.rackspace.cloudloadbalancers.v1.functions.ParseSessionPersistence.java Source code

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Here is the source code for org.jclouds.rackspace.cloudloadbalancers.v1.functions.ParseSessionPersistence.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.rackspace.cloudloadbalancers.v1.functions;

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

import java.util.Map;

import javax.inject.Inject;

import org.jclouds.http.HttpRequest;
import org.jclouds.http.HttpResponse;
import org.jclouds.http.HttpResponseException;
import org.jclouds.http.functions.ParseJson;
import org.jclouds.rackspace.cloudloadbalancers.v1.domain.SessionPersistence;
import org.jclouds.rest.InvocationContext;

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

/**
 * @author Everett Toews
 */
public class ParseSessionPersistence
        implements Function<HttpResponse, SessionPersistence>, InvocationContext<ParseSessionPersistence> {

    private final ParseJson<Map<String, Map<String, SessionPersistence>>> json;

    @Inject
    ParseSessionPersistence(ParseJson<Map<String, Map<String, SessionPersistence>>> json) {
        this.json = checkNotNull(json, "json");
    }

    @Override
    public SessionPersistence apply(HttpResponse response) {
        Map<String, Map<String, SessionPersistence>> map = json.apply(response);

        if (map == null || map.size() == 0)
            throw new HttpResponseException("Unexpected connection logging format returned.", null, response);
        else if (Iterables.get(map.values(), 0).size() == 0)
            return null;
        else
            return Iterables.get(Iterables.get(map.values(), 0).values(), 0);
    }

    @Override
    public ParseSessionPersistence setContext(HttpRequest request) {
        return this;
    }
}