From 895130c6f3d027f9976f55b8ed162dca5c0726b1 Mon Sep 17 00:00:00 2001
From: jprocter <jprocter@compbio.dundee.ac.uk>
Date: Fri, 12 Jan 2007 15:39:22 +0000
Subject: [PATCH] untested watcherElement for spotting changes in
 SessionFlagFile presence/absence.

git-svn-id: https://svn.lifesci.dundee.ac.uk/svn/repository/trunk@337 be28352e-c001-0410-b1a7-c7978e42abec
---
 .../simpleclient/SessionFlagWatcherElement.java    |   54 ++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 src/uk/ac/vamsas/client/simpleclient/SessionFlagWatcherElement.java

diff --git a/src/uk/ac/vamsas/client/simpleclient/SessionFlagWatcherElement.java b/src/uk/ac/vamsas/client/simpleclient/SessionFlagWatcherElement.java
new file mode 100644
index 0000000..8d70d9f
--- /dev/null
+++ b/src/uk/ac/vamsas/client/simpleclient/SessionFlagWatcherElement.java
@@ -0,0 +1,54 @@
+package uk.ac.vamsas.client.simpleclient;
+
+
+/**
+ * Element of the VamsasFileWatcherThread event generator chain.
+ * Keep a reference to this element before adding it to the chain 
+ * in order to control the generation of events with halt and enable.
+ * 
+ * doWatch will do nothing if the element is not enabled.
+ * TODO: TEST THIS CLASS - not yet used in SimpleClient
+ */
+public class SessionFlagWatcherElement extends WatcherElement {
+  SessionFlagFile watched=null;
+  /**
+   * create a new, enabled watch element
+   * @param watcher file being watched
+   * @param handler handler to call on state change
+   */
+  public SessionFlagWatcherElement(SessionFlagFile watcher, WatcherCallBack handler) {
+    this(watcher, handler, true);
+  }
+  protected void initWatch() {
+    if (watched==null)
+      return;
+    watcher = new FileWatcher(watched.flagFile);
+  }
+  protected void endWatch() {
+    // leaves watcher in state its in.
+  }
+  /**
+   * new watcher with flag to initially skip watching this sessionfile
+   * @param watcher
+   * @param handler
+   * @param enableWatching
+   */
+  public SessionFlagWatcherElement(SessionFlagFile watcher, WatcherCallBack handler, boolean enableWatching) {
+    super(handler);
+    this.watched = watcher;
+    if (enableWatching)
+      enableWatch();
+    else
+      haltWatch();
+  }
+  /**
+   * @return the watched
+   */
+  public SessionFlagFile getWatched() {
+    return watched;
+  }
+  protected String getSubject() {
+    
+    return watched.flagFile.toString();
+  }
+}
-- 
1.7.10.2