package com.atlassian.plugin.loaders.classloading;
   
   import java.io.File;
   
   /**
    * A file that is to, or has been, deployed as a plugin.  Differs to the {@link com.atlassian.plugin.PluginArtifact},
    * which identifies an artifact to be deployed but may not be a physical file.
    */
   public final class DeploymentUnit implements Comparable<DeploymentUnit> {
      private final File path;
      private final long lastModifiedAtTimeOfDeployment;
  
      public DeploymentUnit(File path) {
          if (path == null) {
              throw new IllegalArgumentException("File should not be null!");
          }
          this.path = path;
          this.lastModifiedAtTimeOfDeployment = path.lastModified();
      }
  
      public long lastModified() {
          return lastModifiedAtTimeOfDeployment;
      }
  
      public File getPath() {
          return path;
      }
  
      public int compareTo(DeploymentUnit target) {
          int result = path.compareTo(target.getPath());
          if (result == 0)
              result = (lastModifiedAtTimeOfDeployment > target.lastModified() ? 1 :
                      lastModifiedAtTimeOfDeployment < target.lastModified() ? -1 : 0);
          return result;
      }
  
      public boolean equals(Object deploymentUnit) {
          if (deploymentUnit instanceof DeploymentUnit)
              return equals((DeploymentUnit) deploymentUnit);
          else
              return false;
      }
  
      public boolean equals(DeploymentUnit deploymentUnit) {
          if (!path.equals(deploymentUnit.path)) return false;
          if (lastModifiedAtTimeOfDeployment != deploymentUnit.lastModifiedAtTimeOfDeployment) return false;
  
          return true;
      }
  
      public int hashCode() {
          int result;
          result = path.hashCode();
          result = 31 * result + (int) (lastModifiedAtTimeOfDeployment ^ (lastModifiedAtTimeOfDeployment >>> 32));
          return result;
      }
  
      public String toString() {
          return "Unit: " + path.toString() + " (" + lastModifiedAtTimeOfDeployment + ")";
      }
  }