001    /*
002     * SonarQube, open source software quality management tool.
003     * Copyright (C) 2008-2014 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * SonarQube is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * SonarQube is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public License
017     * along with this program; if not, write to the Free Software Foundation,
018     * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
019     */
020    package org.sonar.process;
021    
022    public class Lifecycle {
023    
024      public static enum State {
025        INIT, STARTING, STARTED, STOPPING, STOPPED
026      }
027    
028      private State state = State.INIT;
029    
030      public State getState() {
031        return state;
032      }
033    
034      public synchronized boolean tryToMoveTo(State to) {
035        if (state.ordinal() < to.ordinal()) {
036          state = to;
037          return true;
038        }
039        return false;
040      }
041    
042      @Override
043      public boolean equals(Object o) {
044        if (this == o) {
045          return true;
046        }
047        if (o == null || getClass() != o.getClass()) {
048          return false;
049        }
050        Lifecycle lifecycle = (Lifecycle) o;
051        return state == lifecycle.state;
052      }
053    
054      @Override
055      public int hashCode() {
056        return state.hashCode();
057      }
058    }