/**
* Copyright 2005-2014 Restlet
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: Apache 2.0 or or EPL 1.0 (the "Licenses"). You can
* select the license that you prefer but you may not use this file except in
* compliance with one of these Licenses.
*
* You can obtain a copy of the Apache 2.0 license at
* http://www.opensource.org/licenses/apache-2.0
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://restlet.com/products/restlet-framework
*
* Restlet is a registered trademark of Restlet S.A.S.
*/
package org.restlet.example.ext.wadl;
import java.io.IOException;
import org.restlet.data.Form;
import org.restlet.data.MediaType;
import org.restlet.data.Status;
import org.restlet.ext.wadl.MethodInfo;
import org.restlet.ext.wadl.ParameterInfo;
import org.restlet.ext.wadl.ParameterStyle;
import org.restlet.ext.wadl.RepresentationInfo;
import org.restlet.ext.wadl.ResponseInfo;
import org.restlet.ext.xml.DomRepresentation;
import org.restlet.representation.Representation;
import org.restlet.representation.StringRepresentation;
import org.restlet.resource.Post;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Resource that manages a list of items.
*
*/
public class ItemsResource extends BaseResource {
/**
* Handle POST requests: create a new item.
*/
@Post
public Representation acceptItem(Representation entity) {
Representation result = null;
// Parse the given representation and retrieve pairs of
// "name=value" tokens.
Form form = new Form(entity);
String itemName = form.getFirstValue("name");
String itemDescription = form.getFirstValue("description");
// Register the new item if one is not already registered.
if (!getItems().containsKey(itemName)
&& getItems().putIfAbsent(itemName,
new Item(itemName, itemDescription)) == null) {
// Set the response's status and entity
setStatus(Status.SUCCESS_CREATED);
Representation rep = new StringRepresentation("Item created",
MediaType.TEXT_PLAIN);
// Indicates where is located the new resource.
rep.setLocationRef(getRequest().getResourceRef().getIdentifier()
+ "/" + itemName);
result = rep;
} else { // Item is already registered.
setStatus(Status.CLIENT_ERROR_NOT_FOUND);
result = generateErrorRepresentation("Item " + itemName
+ " already exists.", "1");
}
return result;
}
@Override
protected Representation describe() {
setName("List of items.");
return super.describe();
}
@Override
protected void describeGet(MethodInfo info) {
info.setIdentifier("items");
info.setDocumentation("Retrieve the list of current items.");
ResponseInfo response = new ResponseInfo();
RepresentationInfo repInfo = new RepresentationInfo(MediaType.TEXT_XML);
repInfo.setXmlElement("items");
repInfo.setDocumentation("List of items as XML file");
response.getRepresentations().add(repInfo);
info.getResponses().add(response);
}
@Override
protected void describePost(MethodInfo info) {
info.setIdentifier("create_item");
info.setDocumentation("To create an item.");
RepresentationInfo repInfo = new RepresentationInfo(
MediaType.APPLICATION_WWW_FORM);
ParameterInfo param = new ParameterInfo("name", ParameterStyle.PLAIN,
"Name of the item");
repInfo.getParameters().add(param);
param = new ParameterInfo("description", ParameterStyle.PLAIN,
"Description of the item");
repInfo.getParameters().add(param);
repInfo.setDocumentation("Web form.");
info.getRequest().getRepresentations().add(repInfo);
ResponseInfo response = new ResponseInfo();
response.getStatuses().add(Status.SUCCESS_CREATED);
info.getResponses().add(response);
response = new ResponseInfo();
response.getStatuses().add(Status.CLIENT_ERROR_NOT_FOUND);
info.getResponses().add(response);
repInfo = new RepresentationInfo(MediaType.TEXT_HTML);
repInfo.setIdentifier("itemError");
response.getRepresentations().add(repInfo);
}
/**
* Generate an XML representation of an error response.
*
* @param errorMessage
* the error message.
* @param errorCode
* the error code.
*/
private Representation generateErrorRepresentation(String errorMessage,
String errorCode) {
DomRepresentation result = null;
// This is an error
// Generate the output representation
try {
result = new DomRepresentation(MediaType.TEXT_XML);
// Generate a DOM document representing the list of
// items.
Document d = result.getDocument();
Element eltError = d.createElement("error");
Element eltCode = d.createElement("code");
eltCode.appendChild(d.createTextNode(errorCode));
eltError.appendChild(eltCode);
Element eltMessage = d.createElement("message");
eltMessage.appendChild(d.createTextNode(errorMessage));
eltError.appendChild(eltMessage);
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
/**
* Returns a listing of all registered items.
*/
public Representation toXml() {
// Generate the right representation according to its media type.
try {
DomRepresentation representation = new DomRepresentation(
MediaType.TEXT_XML);
// Generate a DOM document representing the list of
// items.
Document d = representation.getDocument();
Element r = d.createElement("items");
d.appendChild(r);
for (Item item : getItems().values()) {
Element eltItem = d.createElement("item");
Element eltName = d.createElement("name");
eltName.appendChild(d.createTextNode(item.getName()));
eltItem.appendChild(eltName);
Element eltDescription = d.createElement("description");
eltDescription.appendChild(d.createTextNode(item
.getDescription()));
eltItem.appendChild(eltDescription);
r.appendChild(eltItem);
}
d.normalizeDocument();
// Returns the XML representation of this document.
return representation;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}