org.eclipse.linuxtools.lttng/src/org/eclipse/linuxtools/lttng/jni/Jni_C_Pointer.java

   1 package org.eclipse.linuxtools.lttng.jni;
   2
   3 /**
   4  * <b><u>Jni_C_Pointer</u></b>
   5  * <p>
   6  * Class pointer to handle properly "C pointer" <p>
   7  *
   8  * Can transparently handle pointer of 32 or 64 bits.
   9  */
  10 public class Jni_C_Pointer extends Jni_C_Common {
  11
  12     private long ptr = NULL;
  13     private boolean isLong = true;
  14
  15     /**
  16      * Default constructor.<p>
  17      *
  18      * Note : Pointer will be set to a 64bits "NULL".
  19      */
  20     public Jni_C_Pointer() {
  21         ptr  = NULL;
  22     }
  23
  24     /**
  25      * Constructor with parameters for 64bits pointers.
  26      *
  27      * @param newPtr    long-converted (64 bits) C pointer.
  28      */
  29     public Jni_C_Pointer(long newPtr) {
  30         ptr = newPtr;
  31         isLong = true;
  32     }
  33
  34     /**
  35      * Constructor with parameters for 32bits pointers.
  36      *
  37      * @param newPtr    int-converted (32 bits) C pointer.
  38      */
  39     public Jni_C_Pointer(int newPtr) {
  40         ptr = (long)newPtr;
  41         isLong = false;
  42     }
  43
  44     /**
  45      * Get the current pointer.
  46      *
  47      * @return  The current pointer, in long.
  48      */
  49     public long getPointer() {
  50         return ptr;
  51     }
  52
  53     /**
  54      * Set the pointer, as a 64bits pointer.
  55      *
  56      * @param newPtr    long-converted (64 bits) C pointer.
  57      */
  58     public void setPointer(long newPtr) {
  59         ptr = newPtr;
  60         isLong = true;
  61     }
  62
  63     /**
  64      * Set the pointer, as a 64bits pointer.
  65      *
  66      * @param newPtr    int-converted (32 bits) C pointer.
  67      */
  68     public void setPointer(int newPtr) {
  69         ptr = newPtr;
  70         isLong = false;
  71     }
  72
  73     /**
  74      * toString() method. <p>
  75      *
  76      * Convert the pointer to a nice looking int/long hexadecimal format.
  77      *
  78      * @return Attributes of the object concatenated in String
  79      */
  80     @Override
  81     public String toString() {
  82         String returnData = "0x";
  83
  84         if (isLong == true) {
  85             returnData += Long.toHexString(ptr);
  86         }
  87         else {
  88             returnData += Integer.toHexString((int) ptr);
  89         }
  90
  91         return returnData;
  92     }
  93 }