net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/SimpleDelta.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.core;
  12
  13 import net.sourceforge.phpdt.core.IJavaElementDelta;
  14
  15 /**
  16  * A simple Java element delta that remembers the kind of changes only.
  17  */
  18 public class SimpleDelta {
  19
  20         /*
  21          * @see IJavaElementDelta#getKind()
  22          */
  23         protected int kind = 0;
  24
  25         /*
  26          * @see IJavaElementDelta#getFlags()
  27          */
  28         protected int changeFlags = 0;
  29
  30         /*
  31          * Marks this delta as added
  32          */
  33         public void added() {
  34                 this.kind = IJavaElementDelta.ADDED;
  35         }
  36
  37         /*
  38          * Marks this delta as changed with the given change flag
  39          */
  40         public void changed(int flags) {
  41                 this.kind = IJavaElementDelta.CHANGED;
  42                 this.changeFlags |= flags;
  43         }
  44
  45         /*
  46          * @see IJavaElementDelta#getFlags()
  47          */
  48         public int getFlags() {
  49                 return this.changeFlags;
  50         }
  51
  52         /*
  53          * @see IJavaElementDelta#getKind()
  54          */
  55         public int getKind() {
  56                 return this.kind;
  57         }
  58
  59         /*
  60          * Mark this delta has a having a modifiers change
  61          */
  62         public void modifiers() {
  63                 changed(IJavaElementDelta.F_MODIFIERS);
  64         }
  65
  66         /*
  67          * Marks this delta as removed
  68          */
  69         public void removed() {
  70                 this.kind = IJavaElementDelta.REMOVED;
  71                 this.changeFlags = 0;
  72         }
  73
  74         /*
  75          * Mark this delta has a having a super type change
  76          */
  77         public void superTypes() {
  78                 changed(IJavaElementDelta.F_SUPER_TYPES);
  79         }
  80
  81         protected void toDebugString(StringBuffer buffer) {
  82                 buffer.append("["); //$NON-NLS-1$
  83                 switch (getKind()) {
  84                         case IJavaElementDelta.ADDED :
  85                                 buffer.append('+');
  86                                 break;
  87                         case IJavaElementDelta.REMOVED :
  88                                 buffer.append('-');
  89                                 break;
  90                         case IJavaElementDelta.CHANGED :
  91                                 buffer.append('*');
  92                                 break;
  93                         default :
  94                                 buffer.append('?');
  95                                 break;
  96                 }
  97                 buffer.append("]: {"); //$NON-NLS-1$
  98                 toDebugString(buffer, getFlags());
  99                 buffer.append("}"); //$NON-NLS-1$
 100         }
 101
 102         protected boolean toDebugString(StringBuffer buffer, int flags) {
 103                 boolean prev = false;
 104                 if ((flags & IJavaElementDelta.F_MODIFIERS) != 0) {
 105                         if (prev)
 106                                 buffer.append(" | "); //$NON-NLS-1$
 107                         buffer.append("MODIFIERS CHANGED"); //$NON-NLS-1$
 108                         prev = true;
 109                 }
 110                 if ((flags & IJavaElementDelta.F_SUPER_TYPES) != 0) {
 111                         if (prev)
 112                                 buffer.append(" | "); //$NON-NLS-1$
 113                         buffer.append("SUPER TYPES CHANGED"); //$NON-NLS-1$
 114                         prev = true;
 115                 }
 116                 return prev;
 117         }
 118
 119         public String toString() {
 120                 StringBuffer buffer = new StringBuffer();
 121                 toDebugString(buffer);
 122                 return buffer.toString();
 123         }
 124 }