/* 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.control.webharvest.client.csw;
import com.esri.gpt.control.webharvest.IterationContext;
import com.esri.gpt.control.webharvest.common.CommonResult;
import com.esri.gpt.framework.resource.adapters.JoinResourcesAdapter;
import com.esri.gpt.framework.resource.api.Resource;
import com.esri.gpt.framework.resource.query.Criteria;
import com.esri.gpt.framework.resource.query.Query;
import com.esri.gpt.framework.resource.query.Result;
import com.esri.gpt.framework.util.ReadOnlyIterator;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.logging.Logger;
/**
* CSW query.
*/
class CswQuery implements Query {
/** logger */
private static final Logger LOGGER = Logger.getLogger(CswQuery.class.getCanonicalName());
/** iteration context */
private IterationContext context;
/** CSW proxy */
private CswProxy proxy;
/** query criteria */
private Criteria criteria;
/**
* Creates instance of the query.
* @param context iteration context
* @param proxy service proxy
* @param criteria query criteria
*/
public CswQuery(IterationContext context, CswProxy proxy, Criteria criteria) {
if (context == null)
throw new IllegalArgumentException("No context provided.");
if (proxy == null)
throw new IllegalArgumentException("No proxy provided.");
this.context = context;
this.proxy = proxy;
this.criteria = criteria;
}
@Override
public Result execute() {
LOGGER.finer("Executing query: " + this);
Result r = new CommonResult(new JoinResourcesAdapter(new NativeIterable(), new CswFolders(context, proxy, criteria))) {
@Override
public void destroy() {
proxy.destroy();
}
};
LOGGER.finer("Completed query execution: " + this);
return r;
}
@Override
public String toString() {
return "{protocol: " + proxy + ", criteria:" + criteria + "}";
}
/**
* Iterable over native metadata.
*/
private class NativeIterable implements Iterable<Resource> {
@Override
public Iterator<Resource> iterator() {
return new NativeIterator();
}
/**
* Native iterator.
*/
private class NativeIterator extends ReadOnlyIterator<Resource> {
boolean hasNext = true;
public boolean hasNext() {
return hasNext;
}
public Resource next() {
if (!hasNext()) {
throw new NoSuchElementException("No more publishables.");
}
hasNext = false;
return proxy.getNativeResource();
}
}
}
}