android/Bootstrap/src/org/libreoffice/kit/DirectBufferAllocator.java

   1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 package org.libreoffice.kit;
   7
   8 import java.nio.ByteBuffer;
   9
  10 /**
  11  * This is the common code for allocation and freeing of memory. For this direct ByteBuffer is used but
  12  * in the past it was possible to use a JNI version of allocation because of a bug in old Android version.
  13  */
  14 public final class DirectBufferAllocator {
  15
  16     private static final String LOGTAG = DirectBufferAllocator.class.getSimpleName();
  17
  18     private DirectBufferAllocator() {
  19     }
  20
  21     public static ByteBuffer allocate(int size) {
  22         ByteBuffer directBuffer = ByteBuffer.allocateDirect(size);
  23         if (directBuffer == null) {
  24             if (size <= 0) {
  25                 throw new IllegalArgumentException("Invalid allocation size: " + size);
  26             } else {
  27                 throw new OutOfMemoryError("allocateDirectBuffer() returned null");
  28             }
  29         } else if (!directBuffer.isDirect()) {
  30             throw new AssertionError("allocateDirectBuffer() did not return a direct buffer");
  31         }
  32
  33         return directBuffer;
  34     }
  35
  36     public static ByteBuffer free(ByteBuffer buffer) {
  37         if (buffer == null) {
  38             return null;
  39         }
  40
  41         if (!buffer.isDirect()) {
  42             throw new IllegalArgumentException("ByteBuffer must be direct");
  43         }
  44         // can't free buffer - leave this to the VM
  45         return null;
  46     }
  47
  48     public static ByteBuffer guardedAllocate(int size) {
  49         ByteBuffer buffer = null;
  50         try {
  51             buffer = allocate(size);
  52         } catch (OutOfMemoryError oomException) {
  53             return null;
  54         }
  55         return buffer;
  56     }
  57 }