org.agorava.yammer.impl.SubscriptionServiceImpl.java Source code

Introduction

Here is the source code for org.agorava.yammer.impl.SubscriptionServiceImpl.java

Source

/*
 * Copyright 2014 Agorava
 *
 * 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.agorava.yammer.impl;

import java.net.URI;

import org.springframework.social.ResourceNotFoundException;
import org.agorava.yammer.SubscriptionService;
import org.agorava.yammer.YammerBaseService;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

/**
 * @author Werner Keil
 *
 */
public class SubscriptionServiceImpl extends YammerBaseService implements SubscriptionService {

    private RestTemplate restTemplate;

    public SubscriptionServiceImpl(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    public void followUser(long userId) {
        follow("user", userId);
    }

    public void followTopic(long topicId) {
        follow("tag", topicId);
    }

    public void unfollowUser(long userId) {
        unfollow("user", userId);
    }

    public void unfollowTopic(long topicId) {
        unfollow("tag", topicId);
    }

    public boolean isFollowingUser(long userId) {
        return isFollowing(buildUri("subscriptions/to_user/" + userId + ".json"));
    }

    public boolean isFollowingTopic(long topicId) {
        return isFollowing(buildUri("subscriptions/to_topic/" + topicId + ".json"));
    }

    public boolean isFollowingThread(long threadId) {
        return isFollowing(buildUri("subscriptions/to_thread/" + threadId + ".json"));
    }

    private void follow(String targetType, long id) {
        MultiValueMap<String, String> params = toParams(targetType, id);
        restTemplate.postForObject(buildUri("subscriptions"), params, String.class);
    }

    private void unfollow(String targetType, long id) {
        MultiValueMap<String, String> params = toParams(targetType, id);
        restTemplate.delete(buildUri("subscriptions", params));
    }

    private MultiValueMap<String, String> toParams(String targetType, long id) {
        MultiValueMap<String, String> params = new LinkedMultiValueMap<String, String>();
        params.set("target_type", targetType);
        params.set("target_id", String.valueOf(id));
        return params;
    }

    private boolean isFollowing(URI url) {
        try {
            restTemplate.getForObject(url, String.class);
            return true;
        } catch (ResourceNotFoundException ex) {
            return false; //Yammer returns 404 if not following
        }
    }

}