greensopinion.restexample.web.BlogServiceClient.java Source code

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Here is the source code for greensopinion.restexample.web.BlogServiceClient.java

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/*******************************************************************************
 * Copyright (c) 2010 David Green.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     David Green - initial API and implementation
 *******************************************************************************/
package greensopinion.restexample.web;

import greensopinion.restexample.domain.Article;
import greensopinion.restexample.domain.Blog;
import greensopinion.restexample.service.BlogService;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

/**
 * A REST web service client for accessing a {@link BlogService}
 * 
 * @author David Green
 */
@Service
@Qualifier("client")
public class BlogServiceClient implements BlogService {

    public static class Result {
        private Blog blog;
        private Article article;
        private List<Article> articles;

        public Blog getBlog() {
            return blog;
        }

        public void setBlog(Blog blog) {
            this.blog = blog;
        }

        public Article getArticle() {
            return article;
        }

        public void setArticle(Article article) {
            this.article = article;
        }

        public List<Article> getArticleList() {
            return articles;
        }

        public void setArticleList(List<Article> articles) {
            this.articles = articles;
        }

    }

    @Autowired
    protected RestTemplate template;
    private String baseUrl;

    private DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");

    protected String computeUrl(String relativePath) {
        if (baseUrl == null) {
            throw new IllegalStateException();
        }
        return baseUrl + "/" + relativePath;
    }

    public String getBaseUrl() {
        return baseUrl;
    }

    public void setBaseUrl(String baseUrl) {
        this.baseUrl = baseUrl;
    }

    @Override
    public Blog createBlog(Blog blog) {
        Result result = template.postForObject(computeUrl("blog"), blog, Result.class);
        if (result.getBlog() != null) {
            return result.getBlog();
        }
        throw new IllegalStateException("Unexpected result");
    }

    @Override
    public Blog updateBlog(Blog blog) {
        Map<String, String> variables = new HashMap<String, String>();
        variables.put("blogId", blog.getId().toString());
        Result result = template.postForObject(computeUrl("blog/{blogId}"), blog, Result.class, variables);
        if (result.getBlog() != null) {
            return result.getBlog();
        }
        throw new IllegalStateException("Unexpected result");
    }

    @Override
    public Blog getBlog(Long blogId) {
        Map<String, String> variables = new HashMap<String, String>();
        variables.put("blogId", blogId.toString());
        Result result = template.getForObject(computeUrl("blog/{blogId}"), Result.class, variables);
        if (result.getBlog() != null) {
            return result.getBlog();
        }
        throw new IllegalStateException("Unexpected result");
    }

    @Override
    public List<Article> listArticles(Long blogId, Date since) {
        Map<String, Object> variables = new HashMap<String, Object>();
        variables.put("blogId", blogId.toString());
        variables.put("since", dateFormat.format(since));
        Result result = template.getForObject(computeUrl("blog/{blogId}/articles/{since}"), Result.class,
                variables);
        if (result.getArticleList() != null) {
            return result.getArticleList();
        }
        throw new IllegalStateException("Unexpected result");
    }

    @Override
    public Article createArticle(Long blogId, Article article) {
        Map<String, String> variables = new HashMap<String, String>();
        variables.put("blogId", blogId.toString());
        Result result = template.postForObject(computeUrl("blog/{blogId}/article"), article, Result.class,
                variables);
        if (result.getArticle() != null) {
            return result.getArticle();
        }
        throw new IllegalStateException("Unexpected result");
    }

    @Override
    public Article updateArticle(Article article) {
        Map<String, String> variables = new HashMap<String, String>();
        variables.put("articleId", article.getId().toString());
        Result result = template.postForObject(computeUrl("article/{articleId}"), article, Result.class, variables);
        if (result.getArticle() != null) {
            return result.getArticle();
        }
        throw new IllegalStateException("Unexpected result");
    }

    @Override
    public Article getArticle(Long articleId) {
        Map<String, String> variables = new HashMap<String, String>();
        variables.put("articleId", articleId.toString());
        Result result = template.getForObject(computeUrl("article/{articleId}"), Result.class, variables);
        if (result.getArticle() != null) {
            return result.getArticle();
        }
        throw new IllegalStateException("Unexpected result");
    }

}