/*
* 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.jclouds.ec2.xml;
import java.util.Set;
import javax.annotation.Resource;
import javax.inject.Inject;
import org.jclouds.ec2.domain.AvailabilityZoneInfo;
import org.jclouds.http.functions.ParseSax;
import org.jclouds.location.Region;
import org.jclouds.logging.Logger;
import org.xml.sax.Attributes;
import com.google.common.base.Supplier;
import com.google.common.collect.Sets;
/**
*
* @author Adrian Cole
*/
public class DescribeAvailabilityZonesResponseHandler extends ParseSax.HandlerWithResult<Set<AvailabilityZoneInfo>> {
private StringBuilder currentText = new StringBuilder();
private final Supplier<String> defaultRegion;
private Set<AvailabilityZoneInfo> availabilityZones = Sets.newLinkedHashSet();
private String zone;
@Resource
protected Logger logger = Logger.NULL;
private String region;
private String zoneState;
private boolean inMessageSet;
private Set<String> messages = Sets.newHashSet();
/**
* clones like {@code openstack-nova-ec2}, which don't support multiple regions don't return region in the XML
* output.
*/
@Inject
DescribeAvailabilityZonesResponseHandler(@Region Supplier<String> defaultRegion) {
this.defaultRegion = defaultRegion;
}
@Override
public void startDocument() {
region = defaultRegion.get();
}
public Set<AvailabilityZoneInfo> getResult() {
return availabilityZones;
}
public void startElement(String uri, String name, String qName, Attributes attrs) {
if (qName.equals("messageSet")) {
inMessageSet = true;
}
}
public void endElement(String uri, String name, String qName) {
if (qName.equals("zoneName")) {
zone = currentText.toString().trim();
} else if (qName.equals("regionName")) {
try {
region = currentText.toString().trim();
} catch (IllegalArgumentException e) {
logger.warn(e, "unsupported region: %s", currentText.toString().trim());
region = "UNKNOWN";
}
} else if (qName.equals("zoneState")) {
zoneState = currentText.toString().trim();
} else if (qName.equals("message")) {
messages.add(currentText.toString().trim());
} else if (qName.equals("messageSet")) {
inMessageSet = false;
} else if (qName.equals("item") && !inMessageSet) {
availabilityZones.add(new AvailabilityZoneInfo(zone, zoneState, region, messages));
this.zone = null;
this.region = defaultRegion.get();
this.zoneState = null;
this.messages = Sets.newHashSet();
}
currentText = new StringBuilder();
}
public void characters(char ch[], int start, int length) {
currentText.append(ch, start, length);
}
}