1 files changed, 122 insertions, 0 deletions
diff --git a/webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/dev/log/RingBufferAppender.js b/webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/dev/log/RingBufferAppender.js
new file mode 100644
index 0000000000..32d24c6636
--- /dev/null
+++ b/webapps/qooxdoo-0.6.3-sdk/frontend/framework/source/class/qx/dev/log/RingBufferAppender.js
@@ -0,0 +1,122 @@
+/* ************************************************************************
+
+   qooxdoo - the new era of web development
+
+   http://qooxdoo.org
+
+   Copyright:
+     2006 by STZ-IDA, Germany, http://www.stz-ida.de
+
+   License:
+     LGPL 2.1: http://www.gnu.org/licenses/lgpl.html
+
+   Authors:
+     * Carsten Lergenmueller (carstenl)
+
+************************************************************************ */
+
+/* ************************************************************************
+
+#module(log)
+
+************************************************************************ */
+
+/**
+ * An appender that writes all messages to a memory container. The messages
+ * can be retrieved later, f. i. when an error dialog pops up and the question
+ * arises what actions have caused the error.
+ *
+ */
+qx.OO.defineClass("qx.dev.log.RingBufferAppender", qx.dev.log.Appender,
+function() {
+  qx.dev.log.Appender.call(this);
+
+  this._history = [];
+  this._nextIndexToStoreTo = 0;
+  this._appenderToFormatStrings = null;
+});
+
+
+/**
+ * The maximum number of messages to hold. If null the number of messages is not
+ * limited. Warning: Changing this property will clear the events logged so far.
+ */
+qx.OO.addProperty({ name:"maxMessages", type:"number", defaultValue:50 });
+
+qx.Proto._modifyMaxMessages = function(propValue, propOldValue, propData){
+  this._history = [];
+  this._nextIndexToStoreTo = 0;
+};
+
+// overridden
+qx.Proto.appendLogEvent = function(evt) {
+  var maxMessages = this.getMaxMessages();
+  if (this._history.length < maxMessages){
+    this._history.push(evt);
+  } else {
+    this._history[this._nextIndexToStoreTo++] = evt;
+    if (this._nextIndexToStoreTo >= maxMessages){
+      this._nextIndexToStoreTo = 0;
+    }
+  }
+};
+
+/**
+ * Returns log events which have been logged previously.
+ *
+ * @param count {int} The number of events to retreive. If there are more events than the
+ *                    given count, the oldest ones will not be returned.
+ * @return {array} array of stored log events
+ */
+qx.Proto.retrieveLogEvents = function(count) {
+  if (count > this._history.length){
+    count = this._history.length;
+  }
+
+  var indexOfYoungestElementInHistory
+    = this._history.length == this.getMaxMessages() ? this._nextIndexToStoreTo - 1
+                                                    : this._history.length - 1;
+  var startIndex = indexOfYoungestElementInHistory - count + 1;
+  if (startIndex < 0){
+    startIndex += this._history.length;
+  }
+
+  var result;
+  if (startIndex <= indexOfYoungestElementInHistory){
+    result = this._history.slice(startIndex, indexOfYoungestElementInHistory + 1);
+  } else {
+    result = this._history.slice(startIndex, this._history.length).concat(
+                this._history.slice(0, indexOfYoungestElementInHistory + 1)
+              );
+  }
+  return result;
+};
+
+/**
+ * Returns a string holding the information of log events which have been logged previously.
+ *
+ * @param count {int} The number of events to retreive. If there are more events than the
+ *                    given count, the oldest ones will not be returned.
+ * @return {string} string
+ */
+qx.Proto.formatLogEvents = function(count) {
+  if (this._appenderToFormatStrings == null){
+    this._appenderToFormatStrings = new qx.dev.log.Appender();
+  }
+
+  var events = this.retrieveLogEvents(count);
+  var string = "";
+  for(var idx=0; idx < events.length; idx++) {
+    string += this._appenderToFormatStrings.formatLogEvent(events[idx]) + "\n";
+  }
+  return string;
+};
+
+// overridden
+qx.Proto.dispose = function() {
+  if (this.getDisposed()) {
+    return true;
+  }
+
+  return qx.dev.log.Appender.prototype.dispose.call(this);
+};