java/websvc.saas.codegen.java/src/org/netbeans/modules/websvc/saas/codegen/java/resources/RestConnection.template

<#-- FreeMarker template (see http://freemarker.org/)

    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.

-->
<#assign licenseFirst = "/*">
<#assign licensePrefix = " * ">
<#assign licenseLast = " */">
<#include "${project.licensePath}"> 

<#if package?? && package != "">
package ${package};

</#if>
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;


/**
 * ${name}
 *
 * @author ${user}
 */
public class ${name} {

    static {
        //set the identification of the client
        System.setProperty("http.agent", System.getProperty("user.name") + " (from NetBeans IDE)");
    }

    private HttpURLConnection conn;
    private String date;

    /** Creates a new instance of ${name} */
    public ${name}(String baseUrl) {
        this(baseUrl, null, null);
    }

    /** Creates a new instance of ${name} */
    public ${name}(String baseUrl, String[][] params) {
        this(baseUrl, null, params);
    }

    /** Creates a new instance of ${name} */
    public ${name}(String baseUrl, String[][] pathParams, String[][] params) {
        try {
            String urlStr = baseUrl;
            if (pathParams != null && pathParams.length > 0) {
                urlStr = replaceTemplateParameters(baseUrl, pathParams);
            }
            URL url = new URL(encodeUrl(urlStr, params));
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setUseCaches(false);
            conn.setDefaultUseCaches(false);
            conn.setAllowUserInteraction(true);

            SimpleDateFormat format = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z");
            date = format.format(new Date());
            conn.setRequestProperty("Date", date);
        } catch (Exception ex) {
            Logger.getLogger(${name}.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public void setAuthenticator(Authenticator authenticator) {
        Authenticator.setDefault(authenticator);
    }

    public String getDate() {
        return date;
    }

    public RestResponse get() throws IOException {
        return get(null);
    }

    public RestResponse get(String[][] headers) throws IOException {
        conn.setRequestMethod("GET");
        return connect(headers, null);
    }

    public RestResponse head() throws IOException {
        return get(null);
    }

    public RestResponse head(String[][] headers) throws IOException {
        conn.setRequestMethod("HEAD");
        return connect(headers, null);
    }

    public RestResponse put(String[][] headers) throws IOException {
        return put(headers, (InputStream) null);
    }

    public RestResponse put(String[][] headers, String data) throws IOException {
        InputStream is = null;
        if(data != null)
            is = new ByteArrayInputStream(data.getBytes("UTF-8"));
        return put(headers, is);
    }

    public RestResponse put(String[][] headers, InputStream is) throws IOException {
        conn.setRequestMethod("PUT");
        return connect(headers, is);
    }
    
    public RestResponse post(String[][] headers) throws IOException {
        return post(headers, (InputStream) null);
    }

    public RestResponse post(String[][] headers, String data) throws IOException {
        InputStream is = null;
        if(data != null)
            is = new ByteArrayInputStream(data.getBytes("UTF-8"));
        return post(headers, is);
    }
    
    public RestResponse post(String[][] headers, InputStream is) throws IOException {
        conn.setRequestMethod("POST");
        return connect(headers, is);
    }

    /**
     * Used by post method whose contents are like form input
     */
    public RestResponse post(String[][] headers, String[][] params) throws IOException {
        conn.setRequestMethod("POST");
        conn.setRequestProperty("ContentType", "application/x-www-form-urlencoded");
        String data = encodeParams(params);
        return connect(headers, new ByteArrayInputStream(data.getBytes("UTF-8")));
    }

    public RestResponse delete(String[][] headers) throws IOException {
        conn.setRequestMethod("DELETE");
        return connect(headers, null);
    }

    /**
     * @param baseUrl
     * @param params
     * @return response
     */
    private RestResponse connect(String[][] headers,
            InputStream data) throws IOException {
        try {
            // Send data
            setHeaders(headers);

            String method = conn.getRequestMethod();
            
            byte[] buffer = new byte[1024];
            int count = 0;
            
            if (method.equals("PUT") || method.equals("POST")) {
                if (data != null) {
                    conn.setDoOutput(true);
                    OutputStream os = conn.getOutputStream();
                    
                    while ((count = data.read(buffer)) != -1) {
                        os.write(buffer, 0, count);
                    }
                    os.flush();
                }
            }

            RestResponse response = new RestResponse();
            InputStream is = conn.getInputStream();
         
            while ((count = is.read(buffer)) != -1) {
                response.write(buffer, 0, count);
            }

            response.setResponseCode(conn.getResponseCode());
            response.setResponseMessage(conn.getResponseMessage());
            response.setContentType(conn.getContentType());
            response.setContentEncoding(conn.getContentEncoding());
            response.setLastModified(conn.getLastModified());
            
            return response;
        } catch (Exception e) {
            String errMsg = "Cannot connect to :" + conn.getURL();
            try {
                BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getErrorStream()));
                String line;
                StringBuffer buf = new StringBuffer();
                while ((line = rd.readLine()) != null) {
                    buf.append(line);
                    buf.append('\n');
                }
                errMsg = buf.toString();
            } finally {
                throw new IOException(errMsg);
            }
        }
    }

    private String replaceTemplateParameters(String baseUrl, String[][] pathParams) {
        String url = baseUrl;
        if (pathParams != null) {
            for (int i = 0; i < pathParams.length; i++) {
                String key = pathParams[i][0];
                String value = pathParams[i][1];
                if (value == null) {
                    value = "";
                }
                url = url.replace(key, value);
            }
        }
        return url;
    }

    private String encodeUrl(String baseUrl, String[][] params) {
        String encodedParams = encodeParams(params);
        if (encodedParams.length() > 0) {
            encodedParams = "?"+ encodedParams;
        }
        return baseUrl + encodedParams;
    }

    private String encodeParams(String[][] params) {
        String p = "";

        if (params != null) {
            for (int i = 0; i < params.length; i++) {
                String key = params[i][0];
                String value = params[i][1];

                if (value != null) {
                    try {
                        p += key + "=" + URLEncoder.encode(value, "UTF-8") + "&";
                    } catch (UnsupportedEncodingException ex) {
                        Logger.getLogger(${name}.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
            if (p.length() > 0) {
                p = p.substring(0, p.length() - 1);
            }
        }

        return p;
    }

    private void setHeaders(String[][] headers) {
        if (headers != null) {
            for (int i = 0; i < headers.length; i++) {
                conn.setRequestProperty(headers[i][0], headers[i][1]);
            }
        }
    }
}