add the Java Client from M0AZM

[spider.git] / SpiderConsole / src / CommandBuffer.java

diff --git a/SpiderConsole/src/CommandBuffer.java b/SpiderConsole/src/CommandBuffer.java
new file mode 100644 (file)
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+++ b/SpiderConsole/src/CommandBuffer.java
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+/**
+ * Command Buffer for the cluster window of the spider GUI.
+ * @author Ian Norton
+ * @version 1.00 - 20010418.
+ *
+ * Copyright (C) 2001 Ian Norton.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public Licence as published by
+ * the Free Software Foundation; either version 2 of the Licence, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public Licence for more details.
+ *
+ * You should have received a copy of the GNU General Public Licence
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Contacting the author :
+ * Ian Norton
+ * i.norton@lancaster.ac.uk
+ * http://www.lancs.ac.uk/~norton/                                               **/
+
+import java.util.Vector ;
+
+class CommandBuffer
+    {
+    private int top, bottom, pointer, size ;
+    private Vector buffer ;
+    private boolean rolled ;
+
+    /**
+     * main - testing purposes only.
+     **/
+    public static void main(String[] args)
+        {
+        CommandBuffer c = new CommandBuffer(5) ;
+        c.addCommand("1") ;
+        System.out.println(c.getPreviousCommand()) ;
+        System.out.println(c.getNextCommand()) ;
+        }
+
+    /**
+     * CommandBuffer
+     * @param int - Number of lines of buffer.
+     **/
+     public CommandBuffer(int i)
+        {
+        // Size of the buffer.
+        size = i ;
+
+        // "Pointers"
+        bottom = 0 ;
+        pointer = 0 ;
+
+        top = size - 1 ;
+
+        // Vector that does that actual storage.
+        buffer = new Vector(size) ;
+        }
+
+    /**
+     * addCommand
+     * @param String - command to add to the buffer
+     **/
+    public void addCommand(String s)
+        {
+        // Is it an empty string
+        if(s.length() == 0) return ;
+        
+        // Add the command to the buffer
+        buffer.addElement(s) ;
+
+        // Check the buffer remains the correct size.
+        while(buffer.size() > size) buffer.removeElementAt(0) ;
+        
+        // Pointer to the last command
+        pointer = buffer.indexOf(s) ;
+        }
+
+    /**
+     * getPreviousCommand - get the previous command (recursive)
+     * @returns String - previous command
+     **/
+    public String getPreviousCommand()
+        {
+        String output = (String)buffer.elementAt(pointer) ;
+        if(pointer != 0) pointer-- ;
+        return output ;
+        }
+
+    /**
+     * getNextCommand - get the next command (recursive)
+     * @returns String - next command
+     **/
+    public String getNextCommand()
+        {
+        pointer++ ;
+        if(pointer == buffer.size())
+            {
+            pointer-- ;
+            return "" ;
+            }
+        String output = (String)buffer.elementAt(pointer) ;
+        return output ;
+        }
+    } // End of class.