| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.ec2.xml; |
| 20 | |
| 21 | import java.util.Set; |
| 22 | |
| 23 | import javax.inject.Inject; |
| 24 | |
| 25 | import org.jclouds.aws.util.AWSUtils; |
| 26 | import org.jclouds.ec2.domain.InstanceState; |
| 27 | import org.jclouds.ec2.domain.InstanceStateChange; |
| 28 | import org.jclouds.http.functions.ParseSax.HandlerForGeneratedRequestWithResult; |
| 29 | import org.jclouds.location.Region; |
| 30 | import org.xml.sax.Attributes; |
| 31 | |
| 32 | import com.google.common.base.Supplier; |
| 33 | import com.google.common.collect.Sets; |
| 34 | |
| 35 | /** |
| 36 | * Parses the following XML document: |
| 37 | * <p/> |
| 38 | * TerminateInstancesResponse xmlns="http://ec2.amazonaws.com/doc/2010-06-15/" |
| 39 | * StartInstancesResponse xmlns="http://ec2.amazonaws.com/doc/2010-06-15/" StopInstancesResponse |
| 40 | * xmlns="http://ec2.amazonaws.com/doc/2010-06-15/" |
| 41 | * |
| 42 | * @author Adrian Cole |
| 43 | * @see <a href="http://docs.amazonwebservices.com/AWSEC2/latest/APIReference/ApiReference-ItemType-TerminateInstancesResponseInfoType.html" |
| 44 | * /> |
| 45 | * @see <a href="http://docs.amazonwebservices.com/AWSEC2/latest/APIReference/ApiReference-ItemType-StartInstancesResponseInfoType.html" |
| 46 | * /> |
| 47 | * @see <a href="http://docs.amazonwebservices.com/AWSEC2/latest/APIReference/ApiReference-ItemType-StopInstancesResponseInfoType.html" |
| 48 | * /> |
| 49 | */ |
| 50 | public class InstanceStateChangeHandler extends |
| 51 | HandlerForGeneratedRequestWithResult<Set<InstanceStateChange>> { |
| 52 | private StringBuilder currentText = new StringBuilder(); |
| 53 | @Inject |
| 54 | @Region |
| 55 | Supplier<String> defaultRegion; |
| 56 | |
| 57 | Set<InstanceStateChange> instances = Sets.newLinkedHashSet(); |
| 58 | private InstanceState shutdownState; |
| 59 | private InstanceState previousState; |
| 60 | private String instanceId; |
| 61 | |
| 62 | private boolean inCurrentState; |
| 63 | |
| 64 | private boolean inPreviousState; |
| 65 | |
| 66 | @Override |
| 67 | public Set<InstanceStateChange> getResult() { |
| 68 | return instances; |
| 69 | } |
| 70 | |
| 71 | public void startElement(String uri, String name, String qName, Attributes attrs) { |
| 72 | if (qName.equals("shutdownState") || qName.equals("currentState")) { |
| 73 | inCurrentState = true; |
| 74 | } else if (qName.equals("previousState")) { |
| 75 | inPreviousState = true; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | public void endElement(String uri, String name, String qName) { |
| 80 | |
| 81 | if (qName.equals("instanceId")) { |
| 82 | this.instanceId = currentOrNull(); |
| 83 | } else if (qName.equals("shutdownState") || qName.equals("currentState")) { |
| 84 | inCurrentState = false; |
| 85 | } else if (qName.equals("previousState")) { |
| 86 | inPreviousState = false; |
| 87 | } else if (qName.equals("name")) { |
| 88 | if (inCurrentState) { |
| 89 | shutdownState = InstanceState.fromValue(currentOrNull()); |
| 90 | } else if (inPreviousState) { |
| 91 | previousState = InstanceState.fromValue(currentOrNull()); |
| 92 | } |
| 93 | } else if (qName.equals("item")) { |
| 94 | String region = AWSUtils.findRegionInArgsOrNull(getRequest()); |
| 95 | if (region == null) |
| 96 | region = defaultRegion.get(); |
| 97 | instances.add(new InstanceStateChange(region, instanceId, shutdownState, previousState)); |
| 98 | this.instanceId = null; |
| 99 | this.shutdownState = null; |
| 100 | this.previousState = null; |
| 101 | } |
| 102 | |
| 103 | currentText = new StringBuilder(); |
| 104 | } |
| 105 | |
| 106 | public void characters(char ch[], int start, int length) { |
| 107 | currentText.append(ch, start, length); |
| 108 | } |
| 109 | |
| 110 | protected String currentOrNull() { |
| 111 | String returnVal = currentText.toString().trim(); |
| 112 | return returnVal.equals("") ? null : returnVal; |
| 113 | } |
| 114 | } |