/* See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* Esri Inc. 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 com.esri.gpt.framework.resource.adapters;
import com.esri.gpt.framework.resource.api.Publishable;
import com.esri.gpt.framework.resource.api.Resource;
import com.esri.gpt.framework.util.ReadOnlyIterator;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* Provides collection of {@link Publishable} only found in a given collection of
* resources.
*/
public class PublishablesAdapter implements Iterable<Publishable> {
private Iterable<Resource> resources;
/**
* Creates instance of the adapter.
* @param resources collection of resources
*/
public PublishablesAdapter(Iterable<Resource> resources) {
this.resources = resources!=null? resources: new ArrayList<Resource>();
}
public Iterator<Publishable> iterator() {
return new PublishableIterator();
}
/**
* Publishable iterator.
*/
private class PublishableIterator extends ReadOnlyIterator<Publishable> {
/** iterator */
private Iterator<Resource> iterator = resources.iterator();
/** next publishable */
private Publishable next;
public boolean hasNext() {
if (next!=null) return true;
while (iterator.hasNext()) {
Resource resource = iterator.next();
if (resource instanceof Publishable) {
next = (Publishable)resource;
return true;
}
}
return false;
}
public Publishable next() {
if (!hasNext()) {
throw new NoSuchElementException("No more publishables.");
}
Publishable publishable = next;
next = null;
return publishable;
}
}
}