com.github.mhendred.face4j.CopyOfResponderImpl.java Source code

Introduction

Here is the source code for com.github.mhendred.face4j.CopyOfResponderImpl.java

Source

/*
 * Copyright (c) 2010 Marlon Hendred
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.github.mhendred.face4j;

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;

import com.github.mhendred.face4j.exception.FaceClientException;
import com.github.mhendred.face4j.exception.FaceServerException;

/**
 * Default implementation of {@link Responder} interface. It seems as though
 * SkyBiometry always returns an HTTP status code of 200 even for 404 not founds.
 * This is why there is no need to check the status line.
 * 
 * @author Marlon Hendred
 *
 */
class CopyOfResponderImpl implements Responder {

    /**
     * "failure" string constant
     */
    private static final String FAILURE = "failure";

    /**
     * {@link HttpClient} for executing requests
     */
    private final HttpClient httpClient;

    /**
     * {@link HttpPost} method for {@code POST}s
     */
    private final HttpPost postMethod;

    /**
     * {@link HttpGet} method for {@code GET}s
     */
    private final HttpGet getMethod;

    public CopyOfResponderImpl() {
        this.httpClient = new DefaultHttpClient();
        this.postMethod = new HttpPost();
        this.getMethod = new HttpGet();
    }

    /** 
     * @see {@link Responder#doPost(URI, List)}
     */
    public String doPost(final URI uri, final List<NameValuePair> params)
            throws FaceClientException, FaceServerException {
        try {
            final HttpEntity entity = new UrlEncodedFormEntity(params, "UTF-8");

            postMethod.setURI(uri);
            postMethod.setEntity(entity);

            final HttpResponse response = httpClient.execute(postMethod);

            return checkResponse(response);
        }

        catch (IOException ioe) {
            throw new FaceClientException(ioe);
        }
    }

    /**
     * @see {@link Responder#doPost(File, URI, List)}
     */
    public String doPost(final File file, final URI uri, final List<NameValuePair> params)
            throws FaceClientException, FaceServerException {
        try {
            final MultipartEntity entity = new MultipartEntity();

            entity.addPart("image", new FileBody(file));

            try {
                for (NameValuePair nvp : params) {
                    entity.addPart(nvp.getName(), new StringBody(nvp.getValue()));
                }
            }

            catch (UnsupportedEncodingException uee) {
                throw new FaceClientException(uee);
            }

            postMethod.setURI(uri);
            postMethod.setEntity(entity);

            final long start = System.currentTimeMillis();
            final HttpResponse response = httpClient.execute(postMethod);

            return checkResponse(response);
        }

        catch (IOException ioe) {
            throw new FaceClientException(ioe);
        }
    }

    /**
     * @see {@code Responder#doGet(URI)}
     */
    public String doGet(final URI uri) throws FaceClientException, FaceServerException {
        getMethod.setURI(uri);

        try {
            final HttpResponse response = httpClient.execute(getMethod);
            return checkResponse(response);
        }

        catch (IOException ioe) {
            throw new FaceClientException(ioe);
        }
    }

    private String checkResponse(HttpResponse httpResponse) throws FaceServerException, FaceClientException {
        try {
            final String json = EntityUtils.toString(httpResponse.getEntity());

            if (json.contains(FAILURE)) {
                final JSONObject obj = new JSONObject(json);
                final String message = obj.getString("error_message");
                final int errorCode = obj.getInt("error_code");

                final FaceServerException fse = new FaceServerException(message, errorCode);

                throw fse;
            }

            else {

                return json;
            }

        }

        catch (JSONException jse) {
            throw new FaceClientException(jse);
        }

        catch (IOException ioe) {
            throw new FaceClientException(ioe);
        }
    }
}