1 files changed, 94 insertions, 0 deletions
diff --git a/bundles/org.eclipse.wst.ws.explorer/wsexplorer-src/org/eclipse/wst/ws/internal/explorer/platform/perspective/History.java b/bundles/org.eclipse.wst.ws.explorer/wsexplorer-src/org/eclipse/wst/ws/internal/explorer/platform/perspective/History.java
new file mode 100644
index 000000000..5fe2251a1
--- /dev/null
+++ b/bundles/org.eclipse.wst.ws.explorer/wsexplorer-src/org/eclipse/wst/ws/internal/explorer/platform/perspective/History.java
@@ -0,0 +1,94 @@
+/*******************************************************************************
+ * Copyright (c) 2001, 2004 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.wst.ws.internal.explorer.platform.perspective;
+
+import java.util.*;
+
+// A class representing a Vector of breadcrumbs. A position index is used
+// to navigate through the data structure.
+public class History
+{
+  private Vector items_;
+  private int position_;
+
+  public History()
+  {
+    items_ = new Vector();
+    position_ = -1;
+  }
+
+  // Add a new breadcrumb to the history list. When adding a new breadcrumb
+  // within the current list, all breadcrumbs after the newly added one are
+  // removed.
+  public boolean addBreadCrumb(BreadCrumb b)
+  {
+    int numberOfItems = items_.size();
+    if (numberOfItems == 0)
+    {
+      position_++;
+      items_.addElement(b);
+      return true;
+    }
+    else
+    {
+      BreadCrumb currentBreadCrumb = (BreadCrumb)items_.elementAt(position_);
+      if (!currentBreadCrumb.equals(b))
+      {
+        position_++;
+        items_.insertElementAt(b,position_);
+        for (int i=items_.size()-1;i>position_;i--)
+          items_.removeElementAt(i);
+        return true;
+      }
+    }
+    return false;
+  }
+
+  // Move forward within the history list and obtain the breadcrumb.
+  public BreadCrumb forward()
+  {
+    if (position_ < items_.size()-1)
+    {
+      position_++;
+      BreadCrumb b = (BreadCrumb)items_.elementAt(position_);
+      return b;
+    }
+    return null;
+  }
+
+  // Move back within the history list and obtain the breadcrumb.
+  public BreadCrumb back()
+  {
+    if (position_ > 0)
+    {
+      position_--;
+      BreadCrumb b = (BreadCrumb)items_.elementAt(position_);
+      return b;
+    }
+    return null;
+  }
+
+  public void removeCurrentBreadCrumb()
+  {
+    items_.removeElementAt(position_);
+    if (position_ > items_.size()-1)
+      position_--;
+  }
+  
+  public void dump()
+  {
+    for (int i=0;i<items_.size();i++)
+    {
+      BreadCrumb b = (BreadCrumb)items_.elementAt(i);
+    }
+  }
+}