/*
* 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.
*/
package org.apache.wicket;
import java.util.Locale;
import java.util.Map;
import org.apache.wicket.request.IRequestCodingStrategy;
import org.apache.wicket.request.IRequestCycleProcessor;
import org.apache.wicket.request.RequestParameters;
/**
* Base class for page request implementations allowing access to request parameters. A Request has
* a URL and a parameter map. You can retrieve the URL of the request with getURL(). The entire
* parameter map can be retrieved via getParameterMap(). Individual parameters can be retrieved via
* getParameter(String). If multiple values are available for a given parameter, they can be
* retrieved via getParameters(String).
*
* @author Jonathan Locke
*/
public abstract class Request
{
/** Any Page decoded for this request */
private Page page;
/** the type safe request parameters object for this request. */
private RequestParameters requestParameters;
/**
* Construct.
*/
public Request()
{
}
/**
* An implementation of this method is only required if a subclass wishes to support sessions
* via URL rewriting. This default implementation simply returns the URL String it is passed.
*
* @param url
* The URL to decode
* @return The decoded url
*/
public String decodeURL(final String url)
{
return url;
}
/**
* @return The locale for this request
*/
public abstract Locale getLocale();
/**
* @return Any Page for this request
*/
public Page getPage()
{
return page;
}
/**
* Gets a given (query) parameter by name.
*
* @param key
* Parameter name
* @return Parameter value
*/
public abstract String getParameter(final String key);
/**
* Gets a map of (query) parameters sent with the request.
*
* @return Map of parameters
*/
public abstract Map<String, String[]> getParameterMap();
/**
* Gets an array of multiple parameters by name.
*
* @param key
* Parameter name
* @return Parameter values
*/
public abstract String[] getParameters(final String key);
/**
* @return Path info for request
*/
public abstract String getPath();
/**
* Gets a prefix to make this relative to the context root.
* <p>
* For example, if your context root is http://server.com/myApp/ and the request is for
* /myApp/mountedPage/, then the prefix returned might be "../../".
* <p>
* For a particular technology, this might return either an absolute prefix or a relative one.
*
* @return Prefix relative to this request required to back up to context root.
*/
public abstract String getRelativePathPrefixToContextRoot();
/**
* Gets a prefix to make this relative to the Wicket Servlet/Filter.
* <p>
* For example, if your context root is http://server.com/myApp/ and the request is for
* /myApp/mountedPage/, then the prefix returned might be "../".
* <p>
* For a particular technology, this might return either an absolute prefix or a relative one.
*
* @return Prefix relative to this request required to back up to context root.
*/
public abstract String getRelativePathPrefixToWicketHandler();
/**
* Gets the relative (to some root) url (e.g. in a servlet environment, the url without the
* context path and without a leading '/'). Use this method e.g. to load resources using the
* servlet context.
*
* @return Request URL
* @deprecated Use {@link #getURL()} instead.
*/
@Deprecated
public String getRelativeURL()
{
return getURL();
}
/**
* Sets request parameters. Should only be used when one request is being created as a
* replacement for another.
*
* @param requestParameters
*/
public final void setRequestParameters(RequestParameters requestParameters)
{
this.requestParameters = requestParameters;
}
/**
* Gets the request parameters object using the instance of {@link IRequestCodingStrategy} of
* the provided request cycle processor.
*
* @return the request parameters object
*/
public final RequestParameters getRequestParameters()
{
// reused cached parameters
if (requestParameters != null)
{
return requestParameters;
}
// get the request encoder to decode the request parameters
IRequestCycleProcessor processor = RequestCycle.get().getProcessor();
final IRequestCodingStrategy encoder = processor.getRequestCodingStrategy();
if (encoder == null)
{
throw new WicketRuntimeException("request encoder must be not-null (provided by " +
processor + ")");
}
// decode the request parameters into a strongly typed parameters
// object that is to be used by the target resolving
try
{
requestParameters = encoder.decode(this);
}
catch (RuntimeException re)
{
// do set the parameters as it was parsed.
// else the error page will also error again (infinite loop)
requestParameters = new RequestParameters();
throw re;
}
if (requestParameters == null)
{
throw new WicketRuntimeException("request parameters must be not-null (provided by " +
encoder + ")");
}
return requestParameters;
}
/**
* Retrieves the relative URL of this request for local use. This is relative to the context
* root.
*
* @return The relative request URL for local use
*/
public abstract String getURL();
/**
* THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL IT.
*
* @param page
* The Page for this request
*/
public void setPage(final Page page)
{
this.page = page;
}
/**
* A request can say if the current request should generated a new version number. If this
* returns true, then all the changes on a page that has versioning enabled is merged with the
* latest version. Else it will just create a new version.
*
* @return true if the version must be merged with the previous latest.
*/
public boolean mergeVersion()
{
return false;
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return "Request[url=" + getURL() + "]";
}
/**
* Returns the query string (part after ?) of this request.
*
* @return request query string
*/
public abstract String getQueryString();
}
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