jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/ByteBuffer.java@0e5899f09dab (annotated)

src/share/classes/com/sun/tools/javac/util/ByteBuffer.java@0e5899f09dab (annotated)

src/share/classes/com/sun/tools/javac/util/ByteBuffer.java

Tue, 25 Sep 2012 13:06:58 -0700

author: jjg
date: Tue, 25 Sep 2012 13:06:58 -0700
changeset 1339: 0e5899f09dab
parent 581: f2fdd52e4e87
child 2525: 2eb010b6cb22
permissions: -rw-r--r--

7193657: provide internal ArrayUtils class to simplify common usage of arrays in javac
Reviewed-by: mcimadamore, jjg
Contributed-by: vicenterz@yahoo.es

 /*
  * Copyright (c) 1999, 2012, 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.tools.javac.util;
 import java.io.*;
 /** A byte buffer is a flexible array which grows when elements are
  *  appended. There are also methods to append names to byte buffers
  *  and to convert byte buffers to names.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class ByteBuffer {
     /** An array holding the bytes in this buffer; can be grown.
      */
     public byte[] elems;
     /** The current number of defined bytes in this buffer.
      */
     public int length;
     /** Create a new byte buffer.
      */
     public ByteBuffer() {
         this(64);
     }
     /** Create a new byte buffer with an initial elements array
      *  of given size.
      */
     public ByteBuffer(int initialSize) {
         elems = new byte[initialSize];
         length = 0;
     }
     /** Append byte to this buffer.
      */
     public void appendByte(int b) {
         elems = ArrayUtils.ensureCapacity(elems, length);
         elems[length++] = (byte)b;
     }
     /** Append `len' bytes from byte array,
      *  starting at given `start' offset.
      */
     public void appendBytes(byte[] bs, int start, int len) {
         elems = ArrayUtils.ensureCapacity(elems, length + len);
         System.arraycopy(bs, start, elems, length, len);
         length += len;
     }
     /** Append all bytes from given byte array.
      */
     public void appendBytes(byte[] bs) {
         appendBytes(bs, 0, bs.length);
     }
     /** Append a character as a two byte number.
      */
     public void appendChar(int x) {
         elems = ArrayUtils.ensureCapacity(elems, length + 1);
         elems[length  ] = (byte)((x >>  8) & 0xFF);
         elems[length+1] = (byte)((x      ) & 0xFF);
         length = length + 2;
     }
     /** Append an integer as a four byte number.
      */
     public void appendInt(int x) {
         elems = ArrayUtils.ensureCapacity(elems, length + 3);
         elems[length  ] = (byte)((x >> 24) & 0xFF);
         elems[length+1] = (byte)((x >> 16) & 0xFF);
         elems[length+2] = (byte)((x >>  8) & 0xFF);
         elems[length+3] = (byte)((x      ) & 0xFF);
         length = length + 4;
     }
     /** Append a long as an eight byte number.
      */
     public void appendLong(long x) {
         ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
         DataOutputStream bufout = new DataOutputStream(buffer);
         try {
             bufout.writeLong(x);
             appendBytes(buffer.toByteArray(), 0, 8);
         } catch (IOException e) {
             throw new AssertionError("write");
         }
     }
     /** Append a float as a four byte number.
      */
     public void appendFloat(float x) {
         ByteArrayOutputStream buffer = new ByteArrayOutputStream(4);
         DataOutputStream bufout = new DataOutputStream(buffer);
         try {
             bufout.writeFloat(x);
             appendBytes(buffer.toByteArray(), 0, 4);
         } catch (IOException e) {
             throw new AssertionError("write");
         }
     }
     /** Append a double as a eight byte number.
      */
     public void appendDouble(double x) {
         ByteArrayOutputStream buffer = new ByteArrayOutputStream(8);
         DataOutputStream bufout = new DataOutputStream(buffer);
         try {
             bufout.writeDouble(x);
             appendBytes(buffer.toByteArray(), 0, 8);
         } catch (IOException e) {
             throw new AssertionError("write");
         }
     }
     /** Append a name.
      */
     public void appendName(Name name) {
         appendBytes(name.getByteArray(), name.getByteOffset(), name.getByteLength());
     }
     /** Reset to zero length.
      */
     public void reset() {
         length = 0;
     }
     /** Convert contents to name.
      */
     public Name toName(Names names) {
         return names.fromUtf(elems, 0, length);
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/util/ByteBuffer.java@0e5899f09dab (annotated)

src/share/classes/com/sun/tools/javac/util/ByteBuffer.java