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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * http://www.opensource.org/licenses/cddl1.php
 * See the License for the specific language governing
 * permissions and limitations under the License.
 */

/*
 * FormReader.java
 *
 * Created on November 21, 2007, 12:43 PM
 *
 */

package com.sun.jersey.samples.entityprovider;

import com.sun.jersey.samples.entityprovider.resources.NameValuePair;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
import javax.ws.rs.Consumes;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;

/**
 *
 * @author mh124079
 */
@Consumes("application/x-www-form-urlencoded")
@Provider
public class FormReader implements MessageBodyReader {
    
    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type.equals(NameValuePair.class);
    }

    public NameValuePair readFrom(Class type, Type genericType,
            Annotation[] annotations, MediaType mediaType, MultivaluedMap headers, 
            InputStream in) throws IOException {
        String formData = readAsString(in);

        Map map = new HashMap();
        StringTokenizer tokenizer = new StringTokenizer(formData, "&");
        String token;
        while (tokenizer.hasMoreTokens()) {
            token = tokenizer.nextToken();
            int idx = token.indexOf('=');
            if (idx < 0) {
                map.put(URLDecoder.decode(token,"UTF-8"), null);
            } else if (idx > 0) {
                map.put(URLDecoder.decode(token.substring(0, idx),"UTF-8"), URLDecoder.decode(token.substring(idx+1),"UTF-8"));
            }
        }
        
        return new NameValuePair(map.get("name"), map.get("value"));
    }
    
    public final String readAsString(InputStream in) throws IOException {
        Reader reader = new InputStreamReader(in);
        StringBuilder sb = new StringBuilder();
        char[] c = new char[1024];
        int l;
        while ((l = reader.read(c)) != -1) {
            sb.append(c, 0, l);
        } 
        return sb.toString();
    }
}