| /* |
| * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.xml.internal.stream.util; |
| |
| import java.lang.ref.*; |
| |
| /** |
| * Buffer allocator for buffers of sizes 128 B, 2 KB and 8 KB. Includes |
| * methods for allocating and freeing buffers. |
| * |
| * @author Binu.John@sun.com |
| * @author Santiago.PericasGeertsen@sun.com |
| */ |
| public class BufferAllocator { |
| public static int SMALL_SIZE_LIMIT = 128; |
| public static int MEDIUM_SIZE_LIMIT = 2048; |
| public static int LARGE_SIZE_LIMIT = 8192; |
| |
| char[] smallCharBuffer; |
| char[] mediumCharBuffer; |
| char[] largeCharBuffer; |
| |
| byte[] smallByteBuffer; |
| byte[] mediumByteBuffer; |
| byte[] largeByteBuffer; |
| |
| public BufferAllocator() { |
| } |
| |
| public char[] getCharBuffer(int size) { |
| if (size <= SMALL_SIZE_LIMIT) { |
| char[] buffer = smallCharBuffer; |
| smallCharBuffer = null; |
| return buffer; |
| } |
| else if (size <= MEDIUM_SIZE_LIMIT) { |
| char[] buffer = mediumCharBuffer; |
| mediumCharBuffer = null; |
| return buffer; |
| } |
| else if (size <= LARGE_SIZE_LIMIT) { |
| char[] buffer = largeCharBuffer; |
| largeCharBuffer = null; |
| return buffer; |
| } |
| return null; |
| } |
| |
| public void returnCharBuffer(char[] c) { |
| if (c == null) { |
| return; |
| } |
| if (c.length <= SMALL_SIZE_LIMIT) { |
| smallCharBuffer = c; |
| } |
| else if (c.length <= MEDIUM_SIZE_LIMIT) { |
| mediumCharBuffer = c; |
| } |
| else if (c.length <= LARGE_SIZE_LIMIT) { |
| largeCharBuffer = c; |
| } |
| } |
| |
| public byte[] getByteBuffer(int size) { |
| if (size <= SMALL_SIZE_LIMIT) { |
| byte[] buffer = smallByteBuffer; |
| smallByteBuffer = null; |
| return buffer; |
| } |
| else if (size <= MEDIUM_SIZE_LIMIT) { |
| byte[] buffer = mediumByteBuffer; |
| mediumByteBuffer = null; |
| return buffer; |
| } |
| else if (size <= LARGE_SIZE_LIMIT) { |
| byte[] buffer = largeByteBuffer; |
| largeByteBuffer = null; |
| return buffer; |
| } |
| return null; |
| } |
| |
| public void returnByteBuffer(byte[] b) { |
| if (b == null) { |
| return; |
| } |
| if (b.length <= SMALL_SIZE_LIMIT) { |
| smallByteBuffer = b; |
| } |
| else if (b.length <= MEDIUM_SIZE_LIMIT) { |
| mediumByteBuffer = b; |
| } |
| else if (b.length <= LARGE_SIZE_LIMIT) { |
| largeByteBuffer = b; |
| } |
| } |
| |
| } |