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    1   /*
    2    * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/util/HttpURLConnection.java,v 1.15 2004/04/18 23:51:38 jsdever Exp $
    3    * $Revision: 480424 $
    4    * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
    5    *
    6    * ====================================================================
    7    *
    8    *  Licensed to the Apache Software Foundation (ASF) under one or more
    9    *  contributor license agreements.  See the NOTICE file distributed with
    10   *  this work for additional information regarding copyright ownership.
    11   *  The ASF licenses this file to You under the Apache License, Version 2.0
    12   *  (the "License"); you may not use this file except in compliance with
    13   *  the License.  You may obtain a copy of the License at
    14   *
    15   *      http://www.apache.org/licenses/LICENSE-2.0
    16   *
    17   *  Unless required by applicable law or agreed to in writing, software
    18   *  distributed under the License is distributed on an "AS IS" BASIS,
    19   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    20   *  See the License for the specific language governing permissions and
    21   *  limitations under the License.
    22   * ====================================================================
    23   *
    24   * This software consists of voluntary contributions made by many
    25   * individuals on behalf of the Apache Software Foundation.  For more
    26   * information on the Apache Software Foundation, please see
    27   * <http://www.apache.org/>.
    28   *
    29   */
    30
    31  package org.apache.commons.httpclient.util;
    32
    33  import org.apache.commons.httpclient.HttpMethod;
    34  import org.apache.commons.httpclient.Header;
    35
    36  import org.apache.commons.logging.LogFactory;
    37  import org.apache.commons.logging.Log;
    38  import java.io.IOException;
    39  import java.io.InputStream;
    40  import java.io.OutputStream;
    41  import java.net.URL;
    42  import java.net.ProtocolException;
    43  import java.security.Permission;
    44
    45  /**
    46   * Provides a <code>HttpURLConnection</code> wrapper around HttpClient's
    47   * <code>HttpMethod</code>. This allows existing code to easily switch to
    48   * HttpClieht without breaking existing interfaces using the JDK
    49   * <code>HttpURLConnection</code>.
    50   *
    51   * Note 1: The current implementations wraps only a connected
    52   * <code>HttpMethod</code>, ie a method that has alreayd been used to connect
    53   * to an HTTP server.
    54   *
    55   * Note 2: It is a best try effort as different version of the JDK have
    56   * different behaviours for <code>HttpURLConnection</code> (And I'm not even
    57   * including the numerous <code>HttpURLConnection</code> bugs!).
    58   *
    59   * @author <a href="mailto:vmassol@apache.org">Vincent Massol</a>
    60   * @author <a href="mailto:jsdever@apache.org">Jeff Dever</a>
    61   * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
    62   *
    63   * @since 2.0
    64   *
    65   * @version $Id: HttpURLConnection.java 480424 2006-11-29 05:56:49Z bayard $
    66   */
    67  public class HttpURLConnection extends java.net.HttpURLConnection {
    68
    69      // -------------------------------------------------------- Class Variables
    70
    71      /** Log object for this class. */
    72      private static final Log LOG = LogFactory.getLog(HttpURLConnection.class);
    73
    74
    75      // ----------------------------------------------------- Instance Variables
    76
    77      /**
    78       * The <code>HttpMethod</code> object that was used to connect to the
    79       * HTTP server. It contains all the returned data.
    80       */
    81      private HttpMethod method;
    82
    83      /**
    84       * The URL to which we are connected
    85       */
    86      private URL url;
    87
    88
    89
    90      // ----------------------------------------------------------- Constructors
    91
    92      /**
    93       * Creates an <code>HttpURLConnection</code> from a <code>HttpMethod</code>.
    94       *
    95       * @param method the theMethod that was used to connect to the HTTP
    96       *        server and which contains the returned data.
    97       * @param url the URL to which we are connected (includes query string)
    98       */
    99      public HttpURLConnection(HttpMethod method, URL url) {
    100         super(url);
    101         this.method = method;
    102         this.url = url;
    103     }
    104
    105     /**
    106      * Create an instance.
    107      * @param url The URL.
    108      * @see java.net.HttpURLConnection#HttpURLConnection(URL)
    109      */
    110     protected HttpURLConnection(URL url) {
    111         super(url);
    112         throw new RuntimeException("An HTTP URL connection can only be "
    113             + "constructed from a HttpMethod class");
    114     }
    115
    116
    117     // --------------------------------------------------------- Public Methods
    118
    119     /**
    120      * Gets an input stream for the HttpMethod response body.
    121      * @throws IOException If an IO problem occurs.
    122      * @return The input stream.
    123      * @see java.net.HttpURLConnection#getInputStream()
    124      * @see org.apache.commons.httpclient.HttpMethod#getResponseBodyAsStream()
    125      */
    126     public InputStream getInputStream() throws IOException {
    127         LOG.trace("enter HttpURLConnection.getInputStream()");
    128         return this.method.getResponseBodyAsStream();
    129     }
    130
    131     /**
    132      * Not yet implemented.
    133      * Return the error stream.
    134      * @see java.net.HttpURLConnection#getErrorStream()
    135      */
    136     public InputStream getErrorStream() {
    137         LOG.trace("enter HttpURLConnection.getErrorStream()");
    138         throw new RuntimeException("Not implemented yet");
    139     }
    140
    141     /**
    142      * Not yet implemented.
    143      * @see java.net.HttpURLConnection#disconnect()
    144      */
    145     public void disconnect() {
    146         LOG.trace("enter HttpURLConnection.disconnect()");
    147         throw new RuntimeException("Not implemented yet");
    148     }
    149
    150     /**
    151      * Not available: the data must have already been retrieved.
    152      * @throws IOException If an IO problem occurs.
    153      * @see java.net.HttpURLConnection#connect()
    154      */
    155     public void connect() throws IOException {
    156         LOG.trace("enter HttpURLConnection.connect()");
    157         throw new RuntimeException("This class can only be used with already"
    158             + "retrieved data");
    159     }
    160
    161     /**
    162      * Not yet implemented.
    163      * @return true if we are using a proxy.
    164      * @see java.net.HttpURLConnection#usingProxy()
    165      */
    166     public boolean usingProxy() {
    167         LOG.trace("enter HttpURLConnection.usingProxy()");
    168         throw new RuntimeException("Not implemented yet");
    169     }
    170
    171     /**
    172      * Return the request method.
    173      * @return The request method.
    174      * @see java.net.HttpURLConnection#getRequestMethod()
    175      * @see org.apache.commons.httpclient.HttpMethod#getName()
    176      */
    177     public String getRequestMethod() {
    178         LOG.trace("enter HttpURLConnection.getRequestMethod()");
    179         return this.method.getName();
    180     }
    181
    182     /**
    183      * Return the response code.
    184      * @return The response code.
    185      * @throws IOException If an IO problem occurs.
    186      * @see java.net.HttpURLConnection#getResponseCode()
    187      * @see org.apache.commons.httpclient.HttpMethod#getStatusCode()
    188      */
    189     public int getResponseCode() throws IOException {
    190         LOG.trace("enter HttpURLConnection.getResponseCode()");
    191         return this.method.getStatusCode();
    192     }
    193
    194     /**
    195      * Return the response message
    196      * @return The response message
    197      * @throws IOException If an IO problem occurs.
    198      * @see java.net.HttpURLConnection#getResponseMessage()
    199      * @see org.apache.commons.httpclient.HttpMethod#getStatusText()
    200      */
    201     public String getResponseMessage() throws IOException {
    202         LOG.trace("enter HttpURLConnection.getResponseMessage()");
    203         return this.method.getStatusText();
    204     }
    205
    206     /**
    207      * Return the header field
    208      * @param name the name of the header
    209      * @return the header field.
    210      * @see java.net.HttpURLConnection#getHeaderField(String)
    211      * @see org.apache.commons.httpclient.HttpMethod#getResponseHeaders()
    212      */
    213     public String getHeaderField(String name) {
    214         LOG.trace("enter HttpURLConnection.getHeaderField(String)");
    215         // Note: Return the last matching header in the Header[] array, as in
    216         // the JDK implementation.
    217         Header[] headers = this.method.getResponseHeaders();
    218         for (int i = headers.length - 1; i >= 0; i--) {
    219             if (headers[i].getName().equalsIgnoreCase(name)) {
    220                 return headers[i].getValue();
    221             }
    222         }
    223
    224         return null;
    225     }
    226
    227     /**
    228      * Return the header field key
    229      * @param keyPosition The key position
    230      * @return The header field key.
    231      * @see java.net.HttpURLConnection#getHeaderFieldKey(int)
    232      * @see org.apache.commons.httpclient.HttpMethod#getResponseHeaders()
    233      */
    234     public String getHeaderFieldKey(int keyPosition) {
    235         LOG.trace("enter HttpURLConnection.getHeaderFieldKey(int)");
    236
    237         // Note: HttpClient does not consider the returned Status Line as
    238         // a response header. However, getHeaderFieldKey(0) is supposed to
    239         // return null. Hence the special case below ...
    240
    241         if (keyPosition == 0) {
    242             return null;
    243         }
    244
    245         // Note: HttpClient does not currently keep headers in the same order
    246         // that they are read from the HTTP server.
    247
    248         Header[] headers = this.method.getResponseHeaders();
    249         if (keyPosition < 0 || keyPosition > headers.length) {
    250             return null;
    251         }
    252
    253         return headers[keyPosition - 1].getName();
    254     }
    255
    256     /**
    257      * Return the header field at the specified position
    258      * @param position The position
    259      * @return The header field.
    260      * @see java.net.HttpURLConnection#getHeaderField(int)
    261      * @see org.apache.commons.httpclient.HttpMethod#getResponseHeaders()
    262      */
    263     public String getHeaderField(int position) {
    264         LOG.trace("enter HttpURLConnection.getHeaderField(int)");
    265
    266         // Note: HttpClient does not consider the returned Status Line as
    267         // a response header. However, getHeaderField(0) is supposed to
    268         // return the status line. Hence the special case below ...
    269
    270         if (position == 0) {
    271             return this.method.getStatusLine().toString();
    272         }
    273
    274         // Note: HttpClient does not currently keep headers in the same order
    275         // that they are read from the HTTP server.
    276
    277         Header[] headers = this.method.getResponseHeaders();
    278         if (position < 0 || position > headers.length) {
    279             return null;
    280         }
    281
    282         return headers[position - 1].getValue();
    283     }
    284
    285     /**
    286      * Return the URL
    287      * @return The URL.
    288      * @see java.net.HttpURLConnection#getURL()
    289      */
    290     public URL getURL() {
    291         LOG.trace("enter HttpURLConnection.getURL()");
    292         return this.url;
    293     }
    294
    295     // Note: We don't implement the following methods so that they default to
    296     // the JDK implementation. They will all call
    297     // <code>getHeaderField(String)</code> which we have overridden.
    298
    299     // java.net.HttpURLConnection#getHeaderFieldDate(String, long)
    300     // java.net.HttpURLConnection#getContentLength()
    301     // java.net.HttpURLConnection#getContentType()
    302     // java.net.HttpURLConnection#getContentEncoding()
    303     // java.net.HttpURLConnection#getDate()
    304     // java.net.HttpURLConnection#getHeaderFieldInt(String, int)
    305     // java.net.HttpURLConnection#getExpiration()
    306     // java.net.HttpURLConnection#getLastModified()
    307
    308     /**
    309      * Not available: the data must have already been retrieved.
    310      */
    311     public void setInstanceFollowRedirects(boolean isFollowingRedirects) {
    312         LOG.trace("enter HttpURLConnection.setInstanceFollowRedirects(boolean)");
    313         throw new RuntimeException("This class can only be used with already"
    314             + "retrieved data");
    315     }
    316
    317     /**
    318      * Not yet implemented.
    319      */
    320     public boolean getInstanceFollowRedirects() {
    321         LOG.trace("enter HttpURLConnection.getInstanceFollowRedirects()");
    322         throw new RuntimeException("Not implemented yet");
    323     }
    324
    325     /**
    326      * Not available: the data must have already been retrieved.
    327      * @see java.net.HttpURLConnection#setRequestMethod(String)
    328      */
    329     public void setRequestMethod(String method) throws ProtocolException {
    330         LOG.trace("enter HttpURLConnection.setRequestMethod(String)");
    331         throw new RuntimeException("This class can only be used with already"
    332             + "retrieved data");
    333     }
    334
    335     /**
    336      * Not yet implemented.
    337      * @see java.net.HttpURLConnection#getPermission()
    338      */
    339     public Permission getPermission() throws IOException {
    340         LOG.trace("enter HttpURLConnection.getPermission()");
    341         throw new RuntimeException("Not implemented yet");
    342     }
    343
    344     /**
    345      * Not yet implemented.
    346      * @see java.net.HttpURLConnection#getContent()
    347      */
    348     public Object getContent() throws IOException {
    349         LOG.trace("enter HttpURLConnection.getContent()");
    350         throw new RuntimeException("Not implemented yet");
    351     }
    352
    353     /**
    354      * Not yet implemented.
    355      */
    356     public Object getContent(Class[] classes) throws IOException {
    357         LOG.trace("enter HttpURLConnection.getContent(Class[])");
    358         throw new RuntimeException("Not implemented yet");
    359     }
    360
    361     /**
    362      * @see java.net.HttpURLConnection#getOutputStream()
    363      */
    364     public OutputStream getOutputStream() throws IOException {
    365         LOG.trace("enter HttpURLConnection.getOutputStream()");
    366         throw new RuntimeException("This class can only be used with already"
    367             + "retrieved data");
    368     }
    369
    370     /**
    371      * Not available: the data must have already been retrieved.
    372      * @see java.net.HttpURLConnection#setDoInput(boolean)
    373      */
    374     public void setDoInput(boolean isInput) {
    375         LOG.trace("enter HttpURLConnection.setDoInput()");
    376         throw new RuntimeException("This class can only be used with already"
    377             + "retrieved data");
    378     }
    379
    380     /**
    381      * Not yet implemented.
    382      * @see java.net.HttpURLConnection#getDoInput()
    383      */
    384     public boolean getDoInput() {
    385         LOG.trace("enter HttpURLConnection.getDoInput()");
    386         throw new RuntimeException("Not implemented yet");
    387     }
    388
    389     /**
    390      * Not available: the data must have already been retrieved.
    391      * @see java.net.HttpURLConnection#setDoOutput(boolean)
    392      */
    393     public void setDoOutput(boolean isOutput) {
    394         LOG.trace("enter HttpURLConnection.setDoOutput()");
    395         throw new RuntimeException("This class can only be used with already"
    396             + "retrieved data");
    397     }
    398
    399     /**
    400      * Not yet implemented.
    401      * @see java.net.HttpURLConnection#getDoOutput()
    402      */
    403     public boolean getDoOutput() {
    404         LOG.trace("enter HttpURLConnection.getDoOutput()");
    405         throw new RuntimeException("Not implemented yet");
    406     }
    407
    408     /**
    409      * Not available: the data must have already been retrieved.
    410      * @see java.net.HttpURLConnection#setAllowUserInteraction(boolean)
    411      */
    412     public void setAllowUserInteraction(boolean isAllowInteraction) {
    413         LOG.trace("enter HttpURLConnection.setAllowUserInteraction(boolean)");
    414         throw new RuntimeException("This class can only be used with already"
    415             + "retrieved data");
    416     }
    417
    418     /**
    419      * Not yet implemented.
    420      * @see java.net.HttpURLConnection#getAllowUserInteraction()
    421      */
    422     public boolean getAllowUserInteraction() {
    423         LOG.trace("enter HttpURLConnection.getAllowUserInteraction()");
    424         throw new RuntimeException("Not implemented yet");
    425     }
    426
    427     /**
    428      * Not available: the data must have already been retrieved.
    429      * @see java.net.HttpURLConnection#setUseCaches(boolean)
    430      */
    431     public void setUseCaches(boolean isUsingCaches) {
    432         LOG.trace("enter HttpURLConnection.setUseCaches(boolean)");
    433         throw new RuntimeException("This class can only be used with already"
    434             + "retrieved data");
    435     }
    436
    437     /**
    438      * Not yet implemented.
    439      * @see java.net.HttpURLConnection#getUseCaches()
    440      */
    441     public boolean getUseCaches() {
    442         LOG.trace("enter HttpURLConnection.getUseCaches()");
    443         throw new RuntimeException("Not implemented yet");
    444     }
    445
    446     /**
    447      * Not available: the data must have already been retrieved.
    448      * @see java.net.HttpURLConnection#setIfModifiedSince(long)
    449      */
    450     public void setIfModifiedSince(long modificationDate) {
    451         LOG.trace("enter HttpURLConnection.setIfModifiedSince(long)");
    452         throw new RuntimeException("This class can only be used with already"
    453             + "retrieved data");
    454     }
    455
    456     /**
    457      * Not yet implemented.
    458      * @see java.net.HttpURLConnection#getIfModifiedSince()
    459      */
    460     public long getIfModifiedSince() {
    461         LOG.trace("enter HttpURLConnection.getIfmodifiedSince()");
    462         throw new RuntimeException("Not implemented yet");
    463     }
    464
    465     /**
    466      * Not available: the data must have already been retrieved.
    467      * @see java.net.HttpURLConnection#getDefaultUseCaches()
    468      */
    469     public boolean getDefaultUseCaches() {
    470         LOG.trace("enter HttpURLConnection.getDefaultUseCaches()");
    471         throw new RuntimeException("Not implemented yet");
    472     }
    473
    474     /**
    475      * Not available: the data must have already been retrieved.
    476      * @see java.net.HttpURLConnection#setDefaultUseCaches(boolean)
    477      */
    478     public void setDefaultUseCaches(boolean isUsingCaches) {
    479         LOG.trace("enter HttpURLConnection.setDefaultUseCaches(boolean)");
    480         throw new RuntimeException("This class can only be used with already"
    481             + "retrieved data");
    482     }
    483
    484     /**
    485      * Not available: the data must have already been retrieved.
    486      * @see java.net.HttpURLConnection#setRequestProperty(String,String)
    487      */
    488     public void setRequestProperty(String key, String value) {
    489         LOG.trace("enter HttpURLConnection.setRequestProperty()");
    490         throw new RuntimeException("This class can only be used with already"
    491             + "retrieved data");
    492     }
    493
    494     /**
    495      * Not yet implemented.
    496      * @see java.net.HttpURLConnection#getRequestProperty(String)
    497      */
    498     public String getRequestProperty(String key) {
    499         LOG.trace("enter HttpURLConnection.getRequestProperty()");
    500         throw new RuntimeException("Not implemented yet");
    501     }
    502
    503 }
    504