Java tutorial
/* * 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 static com.google.common.base.Preconditions.checkNotNull; import java.util.Date; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import javax.inject.Inject; import org.jclouds.aws.util.AWSUtils; import org.jclouds.date.DateCodec; import org.jclouds.date.DateCodecFactory; import org.jclouds.ec2.domain.Attachment; import org.jclouds.ec2.domain.Volume; import org.jclouds.http.HttpRequest; import org.jclouds.http.functions.ParseSax; import org.jclouds.location.Region; import org.jclouds.location.Zone; import org.jclouds.rest.internal.GeneratedHttpRequest; import org.xml.sax.Attributes; import com.google.common.base.Supplier; import com.google.common.base.Suppliers; import com.google.common.collect.Maps; import com.google.common.collect.Sets; /** * * @author Adrian Cole */ public class CreateVolumeResponseHandler extends ParseSax.HandlerForGeneratedRequestWithResult<Volume> { protected final DateCodec dateCodec; protected final Supplier<String> defaultRegion; protected final Supplier<Map<String, Supplier<Set<String>>>> regionToZonesSupplier; protected final Supplier<Set<String>> zonesSupplier; @Inject protected CreateVolumeResponseHandler(DateCodecFactory dateCodecFactory, @Region Supplier<String> defaultRegion, @Zone Supplier<Map<String, Supplier<Set<String>>>> regionToZonesSupplier, @Zone Supplier<Set<String>> zonesSupplier) { this.dateCodec = dateCodecFactory.iso8601(); this.defaultRegion = defaultRegion; this.regionToZonesSupplier = regionToZonesSupplier; this.zonesSupplier = zonesSupplier; } protected StringBuilder currentText = new StringBuilder(); protected String id; protected int size; protected String snapshotId; protected String availabilityZone; protected Volume.Status volumeStatus; protected Date createTime; protected Set<Attachment> attachments = Sets.newLinkedHashSet(); protected String volumeId; protected String instanceId; protected String device; protected Attachment.Status attachmentStatus; protected Date attachTime; protected boolean inAttachmentSet; protected String region; public Volume getResult() { return newVolume(); } public void startElement(String uri, String name, String qName, Attributes attrs) { if (qName.equals("attachmentSet")) { inAttachmentSet = true; } } public void endElement(String uri, String name, String qName) { if (qName.equals("volumeId")) { if (inAttachmentSet) { volumeId = currentText.toString().trim(); } else { id = currentText.toString().trim(); } } else if (qName.equals("size")) { size = Integer.parseInt(currentText.toString().trim()); } else if (qName.equals("availabilityZone")) { availabilityZone = currentText.toString().trim(); } else if (qName.equals("volumeId")) { if (inAttachmentSet) { volumeId = currentText.toString().trim(); } else { id = currentText.toString().trim(); } } else if (qName.equals("status")) { if (inAttachmentSet) { attachmentStatus = Attachment.Status.fromValue(currentText.toString().trim()); } else { volumeStatus = Volume.Status.fromValue(currentText.toString().trim()); } } else if (qName.equals("createTime")) { createTime = dateCodec.toDate(currentText.toString().trim()); } else if (qName.equals("attachmentSet")) { inAttachmentSet = false; } else if (qName.equals("instanceId")) { instanceId = currentText.toString().trim(); } else if (qName.equals("snapshotId")) { snapshotId = currentText.toString().trim(); if (snapshotId.equals("")) snapshotId = null; } else if (qName.equals("device")) { device = currentText.toString().trim(); } else if (qName.equals("attachTime")) { attachTime = dateCodec.toDate(currentText.toString().trim()); } else if (qName.equals("item")) { if (inAttachmentSet) { attachments.add(new Attachment(region, volumeId, instanceId, device, attachmentStatus, attachTime)); volumeId = null; instanceId = null; device = null; attachmentStatus = null; attachTime = null; } } currentText = new StringBuilder(); } private Volume newVolume() { Volume volume = new Volume(region, id, size, snapshotId, availabilityZone, volumeStatus, createTime, attachments); id = null; size = 0; snapshotId = null; availabilityZone = null; volumeStatus = null; createTime = null; attachments = Sets.newLinkedHashSet(); return volume; } public void characters(char ch[], int start, int length) { currentText.append(ch, start, length); } @Override public CreateVolumeResponseHandler setContext(HttpRequest request) { super.setContext(request); region = AWSUtils.findRegionInArgsOrNull(getRequest()); if (region == null) { Set<String> zones = zonesSupplier.get(); String zone = findAvailabilityZoneInArgsOrNull(getRequest(), zones); if (zone != null) { Map<String, Set<String>> regionToZones = Maps.transformValues(regionToZonesSupplier.get(), Suppliers.<Set<String>>supplierFunction()); for (Entry<String, Set<String>> entry : regionToZones.entrySet()) { if (entry.getValue().contains(zone)) { region = entry.getKey(); break; } } checkNotNull(regionToZones, String.format("zone %s not in %s", zone, regionToZones)); } else { region = defaultRegion.get(); } } return this; } public static String findAvailabilityZoneInArgsOrNull(GeneratedHttpRequest gRequest, Set<String> zones) { for (Object arg : gRequest.getInvocation().getArgs()) { if (arg instanceof String) { String zone = (String) arg; if (zones.contains(zone)) return zone; } } return null; } }