/*
* © Copyright IBM Corp. 2013
*
* Licensed 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 com.ibm.sbt.services.client.base;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import com.ibm.commons.xml.xpath.XPathExpression;
import com.ibm.sbt.services.client.Response;
import com.ibm.sbt.services.client.base.datahandlers.AtomEntityList;
import com.ibm.sbt.services.client.base.datahandlers.EntityList;
/**
* @author Mario Duarte
* @author Carlos Manias
*
*/
public abstract class AtomFeedHandler<T extends AtomEntity> implements IFeedHandler<T> {
private BaseService service;
private boolean isFeed;
/**
*
* @param service
*/
public AtomFeedHandler(BaseService service) {
this(service, true);
}
/**
*
* @param service
* @param isFeed True by default. If false, it uses an xPath for a single entry. If true, it uses an xPath for a feed
*/
public AtomFeedHandler(BaseService service, boolean isFeed) {
this.service = service;
this.isFeed = isFeed;
}
@Override
public T createEntity(Response response) {
if (response == null) {
return null;
}
Object data = response.getData();
if (data instanceof Node) {
return createEntityFromData((Node)data);
} else {
return null;
}
}
@Override
public T createEntityFromData(Object data) {
return newEntity(service, (Node)data);
}
@Override
public EntityList<T> createEntityList(Response dataHolder) {
return new AtomEntityList<T>(dataHolder, this);
}
@Override
public BaseService getService() {
return service;
}
protected XPathExpression getEntityXPath(Node node){
if (node instanceof Document){
return (XPathExpression)(isFeed?AtomXPath.entry.getPath():AtomXPath.singleEntry.getPath());
} else {
return null;
}
}
protected T newEntity(BaseService service, Node node){
XPathExpression xpath = getEntityXPath(node);
return entityInstance(service, node, xpath);
}
abstract protected T entityInstance(BaseService service, Node node, XPathExpression xpath);
}