org.eclipse.linuxtools.lttng.core/src/org/eclipse/linuxtools/lttng/core/state/model/LttngBdevState.java

   1 /*******************************************************************************
   2  * Copyright (c) 2009 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Alvaro Sanchez-Leon (alvsan09@gmail.com) - Initial API and implementation
  11  *******************************************************************************/
  12 package org.eclipse.linuxtools.lttng.core.state.model;
  13
  14 import java.util.Stack;
  15
  16 import org.eclipse.linuxtools.lttng.core.TraceDebug;
  17 import org.eclipse.linuxtools.lttng.core.state.StateStrings.BdevMode;
  18
  19 /**
  20  * <b><u>LttvBdevState</u></b>
  21  * <p>
  22  *
  23  */
  24 public class LttngBdevState implements Cloneable {
  25     // ========================================================================
  26         // Data
  27     // =======================================================================
  28         private Stack<BdevMode> mode_stack = new Stack<BdevMode>() ;
  29
  30
  31     // ========================================================================
  32         // Constructor
  33     // =======================================================================
  34         public LttngBdevState() {
  35                 mode_stack.push(BdevMode.LTTV_BDEV_UNKNOWN);
  36         }
  37
  38         // ========================================================================
  39         // Methods
  40         // =======================================================================
  41         public void clearBdevStack() {
  42         mode_stack.clear();
  43     }
  44
  45         public void clearAndSetBaseToBdevStack(BdevMode newState) {
  46         mode_stack.clear();
  47         // Ensure that there is always at least 1 item in the stack
  48         mode_stack.push(newState);
  49     }
  50
  51     public void pushToBdevStack(BdevMode newState) {
  52         mode_stack.push(newState);
  53     }
  54
  55     public BdevMode popFromBdevStack() {
  56
  57        BdevMode returnedMode = mode_stack.pop();
  58
  59        if (mode_stack.size() < 1) {
  60             TraceDebug.debug("Removing last item from mode stack is not allowed! (popFromModeStack)"); //$NON-NLS-1$
  61             mode_stack.push(BdevMode.LTTV_BDEV_UNKNOWN);
  62        }
  63
  64        return returnedMode;
  65     }
  66
  67     public BdevMode peekFromBdevStack() {
  68         return mode_stack.peek();
  69     }
  70
  71
  72         @Override
  73         @SuppressWarnings("unchecked")
  74     public LttngBdevState clone() {
  75             LttngBdevState newState = null;
  76
  77             try {
  78                 newState = (LttngBdevState)super.clone();
  79                 // Clone should work correctly for all stack object that contain basic java object (String, Long, etc...)
  80                 newState.mode_stack = (Stack<BdevMode>)this.mode_stack.clone();
  81             }
  82             catch ( CloneNotSupportedException e ) {
  83                 System.out.println("Cloning failed with : " + e.getMessage() ); //$NON-NLS-1$
  84             }
  85
  86             return newState;
  87         }
  88
  89 }