2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.config.persist.storage.file.xml.model;
10 import com.google.common.base.Charsets;
11 import com.google.common.base.Optional;
12 import com.google.common.collect.Iterables;
13 import com.google.common.collect.Lists;
14 import com.google.common.io.Files;
15 import org.apache.commons.lang3.StringUtils;
17 import javax.xml.bind.JAXBContext;
18 import javax.xml.bind.JAXBException;
19 import javax.xml.bind.Marshaller;
20 import javax.xml.bind.Unmarshaller;
21 import javax.xml.bind.annotation.XmlElement;
22 import javax.xml.bind.annotation.XmlElementWrapper;
23 import javax.xml.bind.annotation.XmlRootElement;
25 import java.io.IOException;
26 import java.util.List;
28 @XmlRootElement(name = "persisted-snapshots")
29 public final class Config {
31 private List<ConfigSnapshot> snapshots;
33 Config(List<ConfigSnapshot> snapshots) {
34 this.snapshots = snapshots;
38 this.snapshots = Lists.newArrayList();
41 @XmlElement(name = "snapshot")
42 @XmlElementWrapper(name = "snapshots")
43 public List<ConfigSnapshot> getSnapshots() {
47 public void setSnapshots(List<ConfigSnapshot> snapshots) {
48 this.snapshots = snapshots;
51 public void toXml(File to) {
54 // TODO Moxy has to be used instead of default jaxb impl due to a bug
55 // default implementation has a bug that prevents from serializing xml in a string
56 JAXBContext jaxbContext = org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(new Class[]{Config.class}, null);
58 Marshaller marshaller = jaxbContext.createMarshaller();
60 marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
62 marshaller.marshal(this, to);
63 } catch (JAXBException e) {
64 throw new PersistException("Unable to persist configuration", e);
68 public static Config fromXml(File from) {
73 JAXBContext jaxbContext = JAXBContext.newInstance(Config.class);
74 Unmarshaller um = jaxbContext.createUnmarshaller();
76 return (Config) um.unmarshal(from);
77 } catch (JAXBException e) {
78 throw new PersistException("Unable to restore configuration", e);
82 private static boolean isEmpty(File from) {
83 return from.length() == 0 || isBlank(from);
86 private static boolean isBlank(File from) {
88 return StringUtils.isBlank(Files.toString(from, Charsets.UTF_8));
89 } catch (IOException e) {
90 throw new IllegalStateException("Unexpected error reading file" + from, e);
94 public Optional<ConfigSnapshot> getLastSnapshot() {
95 ConfigSnapshot last = Iterables.getLast(snapshots, null);
96 return last == null ? Optional.<ConfigSnapshot>absent() : Optional.of(last);
99 public void addConfigSnapshot(ConfigSnapshot snap, int numberOfStoredBackups) {
100 if(shouldReplaceLast(numberOfStoredBackups) && snapshots.isEmpty() == false) {
106 private boolean shouldReplaceLast(int numberOfStoredBackups) {
107 return numberOfStoredBackups == snapshots.size();