/*
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/methods/PostMethod.java,v 1.58 2004/08/08 12:50:09 olegk Exp $
* $Revision: 480424 $
* $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
*
* ====================================================================
*
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.commons.httpclient.methods;
import java.util.Iterator;
import java.util.Vector;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.util.EncodingUtil;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Implements the HTTP POST method.
* <p>
* The HTTP POST method is defined in section 9.5 of
* <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC2616</a>:
* <blockquote>
* The POST method is used to request that the origin server accept the entity
* enclosed in the request as a new subordinate of the resource identified by
* the Request-URI in the Request-Line. POST is designed to allow a uniform
* method to cover the following functions:
* <ul>
* <li>Annotation of existing resources</li>
* <li>Posting a message to a bulletin board, newsgroup, mailing list, or
* similar group of articles</li>
* <li>Providing a block of data, such as the result of submitting a form,
* to a data-handling process</li>
* <li>Extending a database through an append operation</li>
* </ul>
* </blockquote>
* </p>
*
* @author <a href="mailto:remm@apache.org">Remy Maucherat</a>
* @author <a href="mailto:dsale@us.britannica.com">Doug Sale</a>
* @author <a href="mailto:jsdever@apache.org">Jeff Dever</a>
* @author Ortwin Gl???ck
* @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
* @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 480424 $
* @since 1.0
*/
public class PostMethod extends EntityEnclosingMethod {
// -------------------------------------------------------------- Constants
/** Log object for this class. */
private static final Log LOG = LogFactory.getLog(PostMethod.class);
/** The Content-Type for www-form-urlencoded. */
public static final String FORM_URL_ENCODED_CONTENT_TYPE =
"application/x-www-form-urlencoded";
/**
* The buffered request body consisting of <code>NameValuePair</code>s.
*/
private Vector params = new Vector();
// ----------------------------------------------------------- Constructors
/**
* No-arg constructor.
*
* @since 1.0
*/
public PostMethod() {
super();
}
/**
* Constructor specifying a URI.
*
* @param uri either an absolute or relative URI
*
* @since 1.0
*/
public PostMethod(String uri) {
super(uri);
}
// ----------------------------------------------------- Instance Methods
/**
* Returns <tt>"POST"</tt>.
*
* @return <tt>"POST"</tt>
*
* @since 2.0
*/
public String getName() {
return "POST";
}
/**
* Returns <tt>true</tt> if there is a request body to be sent.
*
* <P>This method must be overwritten by sub-classes that implement
* alternative request content input methods
* </p>
*
* @return boolean
*
* @since 2.0beta1
*/
protected boolean hasRequestContent() {
LOG.trace("enter PostMethod.hasRequestContent()");
if (!this.params.isEmpty()) {
return true;
} else {
return super.hasRequestContent();
}
}
/**
* Clears request body.
*
* <p>This method must be overwritten by sub-classes that implement
* alternative request content input methods</p>
*
* @since 2.0beta1
*/
protected void clearRequestBody() {
LOG.trace("enter PostMethod.clearRequestBody()");
this.params.clear();
super.clearRequestBody();
}
/**
* Generates a request entity from the post parameters, if present. Calls
* {@link EntityEnclosingMethod#generateRequestBody()} if parameters have not been set.
*
* @since 3.0
*/
protected RequestEntity generateRequestEntity() {
if (!this.params.isEmpty()) {
// Use a ByteArrayRequestEntity instead of a StringRequestEntity.
// This is to avoid potential encoding issues. Form url encoded strings
// are ASCII by definition but the content type may not be. Treating the content
// as bytes allows us to keep the current charset without worrying about how
// this charset will effect the encoding of the form url encoded string.
String content = EncodingUtil.formUrlEncode(getParameters(), getRequestCharSet());
ByteArrayRequestEntity entity = new ByteArrayRequestEntity(
EncodingUtil.getAsciiBytes(content),
FORM_URL_ENCODED_CONTENT_TYPE
);
return entity;
} else {
return super.generateRequestEntity();
}
}
/**
* Sets the value of parameter with parameterName to parameterValue. This method
* does not preserve the initial insertion order.
*
* @param parameterName name of the parameter
* @param parameterValue value of the parameter
*
* @since 2.0
*/
public void setParameter(String parameterName, String parameterValue) {
LOG.trace("enter PostMethod.setParameter(String, String)");
removeParameter(parameterName);
addParameter(parameterName, parameterValue);
}
/**
* Gets the parameter of the specified name. If there exists more than one
* parameter with the name paramName, then only the first one is returned.
*
* @param paramName name of the parameter
*
* @return If a parameter exists with the name argument, the coresponding
* NameValuePair is returned. Otherwise null.
*
* @since 2.0
*
*/
public NameValuePair getParameter(String paramName) {
LOG.trace("enter PostMethod.getParameter(String)");
if (paramName == null) {
return null;
}
Iterator iter = this.params.iterator();
while (iter.hasNext()) {
NameValuePair parameter = (NameValuePair) iter.next();
if (paramName.equals(parameter.getName())) {
return parameter;
}
}
return null;
}
/**
* Gets the parameters currently added to the PostMethod. If there are no
* parameters, a valid array is returned with zero elements. The returned
* array object contains an array of pointers to the internal data
* members.
*
* @return An array of the current parameters
*
* @since 2.0
*
*/
public NameValuePair[] getParameters() {
LOG.trace("enter PostMethod.getParameters()");
int numPairs = this.params.size();
Object[] objectArr = this.params.toArray();
NameValuePair[] nvPairArr = new NameValuePair[numPairs];
for (int i = 0; i < numPairs; i++) {
nvPairArr[i] = (NameValuePair) objectArr[i];
}
return nvPairArr;
}
/**
* Adds a new parameter to be used in the POST request body.
*
* @param paramName The parameter name to add.
* @param paramValue The parameter value to add.
*
* @throws IllegalArgumentException if either argument is null
*
* @since 1.0
*/
public void addParameter(String paramName, String paramValue)
throws IllegalArgumentException {
LOG.trace("enter PostMethod.addParameter(String, String)");
if ((paramName == null) || (paramValue == null)) {
throw new IllegalArgumentException(
"Arguments to addParameter(String, String) cannot be null");
}
super.clearRequestBody();
this.params.add(new NameValuePair(paramName, paramValue));
}
/**
* Adds a new parameter to be used in the POST request body.
*
* @param param The parameter to add.
*
* @throws IllegalArgumentException if the argument is null or contains
* null values
*
* @since 2.0
*/
public void addParameter(NameValuePair param)
throws IllegalArgumentException {
LOG.trace("enter PostMethod.addParameter(NameValuePair)");
if (param == null) {
throw new IllegalArgumentException("NameValuePair may not be null");
}
addParameter(param.getName(), param.getValue());
}
/**
* Adds an array of parameters to be used in the POST request body. Logs a
* warning if the parameters argument is null.
*
* @param parameters The array of parameters to add.
*
* @since 2.0
*/
public void addParameters(NameValuePair[] parameters) {
LOG.trace("enter PostMethod.addParameters(NameValuePair[])");
if (parameters == null) {
LOG.warn("Attempt to addParameters(null) ignored");
} else {
super.clearRequestBody();
for (int i = 0; i < parameters.length; i++) {
this.params.add(parameters[i]);
}
}
}
/**
* Removes all parameters with the given paramName. If there is more than
* one parameter with the given paramName, all of them are removed. If
* there is just one, it is removed. If there are none, then the request
* is ignored.
*
* @param paramName The parameter name to remove.
*
* @return true if at least one parameter was removed
*
* @throws IllegalArgumentException When the parameter name passed is null
*
* @since 2.0
*/
public boolean removeParameter(String paramName)
throws IllegalArgumentException {
LOG.trace("enter PostMethod.removeParameter(String)");
if (paramName == null) {
throw new IllegalArgumentException(
"Argument passed to removeParameter(String) cannot be null");
}
boolean removed = false;
Iterator iter = this.params.iterator();
while (iter.hasNext()) {
NameValuePair pair = (NameValuePair) iter.next();
if (paramName.equals(pair.getName())) {
iter.remove();
removed = true;
}
}
return removed;
}
/**
* Removes all parameter with the given paramName and paramValue. If there
* is more than one parameter with the given paramName, only one is
* removed. If there are none, then the request is ignored.
*
* @param paramName The parameter name to remove.
* @param paramValue The parameter value to remove.
*
* @return true if a parameter was removed.
*
* @throws IllegalArgumentException when param name or value are null
*
* @since 2.0
*/
public boolean removeParameter(String paramName, String paramValue)
throws IllegalArgumentException {
LOG.trace("enter PostMethod.removeParameter(String, String)");
if (paramName == null) {
throw new IllegalArgumentException("Parameter name may not be null");
}
if (paramValue == null) {
throw new IllegalArgumentException("Parameter value may not be null");
}
Iterator iter = this.params.iterator();
while (iter.hasNext()) {
NameValuePair pair = (NameValuePair) iter.next();
if (paramName.equals(pair.getName())
&& paramValue.equals(pair.getValue())) {
iter.remove();
return true;
}
}
return false;
}
/**
* Sets an array of parameters to be used in the POST request body
*
* @param parametersBody The array of parameters to add.
*
* @throws IllegalArgumentException when param parameters are null
*
* @since 2.0beta1
*/
public void setRequestBody(NameValuePair[] parametersBody)
throws IllegalArgumentException {
LOG.trace("enter PostMethod.setRequestBody(NameValuePair[])");
if (parametersBody == null) {
throw new IllegalArgumentException("Array of parameters may not be null");
}
clearRequestBody();
addParameters(parametersBody);
}
}