274 lines
6.9 KiB
Java
274 lines
6.9 KiB
Java
// StringBuffer.java - Growable strings.
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/* Copyright (C) 1998, 1999, 2000 Red Hat
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.lang;
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import java.io.Serializable;
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/**
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* @author Tom Tromey <tromey@cygnus.com>
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* @date October 23, 1998.
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*/
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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*/
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public final class StringBuffer implements Serializable
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{
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public StringBuffer append (boolean bool)
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{
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return append (String.valueOf(bool));
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}
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public synchronized StringBuffer append (char ch)
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{
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ensureCapacity (count + 1);
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value[count++] = ch;
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return this;
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}
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public StringBuffer append (int inum)
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{
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return append (String.valueOf(inum));
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}
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public StringBuffer append (long lnum)
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{
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return append (String.valueOf(lnum));
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}
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public StringBuffer append (float fnum)
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{
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return append (String.valueOf(fnum));
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}
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public StringBuffer append (double dnum)
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{
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return append (String.valueOf(dnum));
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}
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public StringBuffer append (Object obj)
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{
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return append (String.valueOf(obj));
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}
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public synchronized StringBuffer append (String str)
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{
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if (str == null)
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str = "null";
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int len = str.length();
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ensureCapacity (count + len);
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str.getChars(0, len, value, count);
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count += len;
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return this;
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}
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public StringBuffer append (char[] data)
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{
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return append (data, 0, data.length);
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}
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public synchronized StringBuffer append (char[] data, int offset, int count)
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{
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ensureCapacity (this.count + count);
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System.arraycopy(data, offset, value, this.count, count);
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this.count += count;
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return this;
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}
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public int capacity ()
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{
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return value.length;
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}
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public synchronized char charAt (int index)
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{
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if (index >= count)
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throw new StringIndexOutOfBoundsException (index);
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return value[index];
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}
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public synchronized void ensureCapacity (int minimumCapacity)
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{
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if (shared || minimumCapacity > value.length)
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{
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// We don't want to make a larger vector when `shared' is
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// set. If we do, then setLength becomes very inefficient
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// when repeatedly reusing a StringBuffer in a loop.
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int max = (minimumCapacity > value.length
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? value.length*2+2
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: value.length);
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minimumCapacity = Math.max(minimumCapacity, max);
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char[] nb = new char[minimumCapacity];
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System.arraycopy(value, 0, nb, 0, count);
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value = nb;
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shared = false;
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}
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}
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public synchronized void getChars (int srcOffset, int srcEnd,
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char[] dst, int dstOffset)
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{
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if (srcOffset < 0 || srcOffset > srcEnd)
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throw new StringIndexOutOfBoundsException (srcOffset);
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int todo = srcEnd - srcOffset;
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if (srcEnd > count || dstOffset + todo > count)
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throw new StringIndexOutOfBoundsException (srcEnd);
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System.arraycopy(value, srcOffset, dst, dstOffset, todo);
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}
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public StringBuffer insert (int offset, boolean bool)
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{
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return insert (offset, bool ? "true" : "false");
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}
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public synchronized StringBuffer insert (int offset, char ch)
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{
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if (offset < 0 || offset > count)
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throw new StringIndexOutOfBoundsException (offset);
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ensureCapacity (count+1);
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System.arraycopy(value, offset, value, offset+1, count-offset);
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value[offset] = ch;
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count++;
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return this;
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}
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public StringBuffer insert (int offset, int inum)
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{
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return insert (offset, String.valueOf(inum));
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}
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public StringBuffer insert (int offset, long lnum)
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{
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return insert (offset, String.valueOf(lnum));
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}
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public StringBuffer insert (int offset, float fnum)
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{
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return insert (offset, String.valueOf(fnum));
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}
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public StringBuffer insert (int offset, double dnum)
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{
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return insert (offset, String.valueOf(dnum));
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}
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public StringBuffer insert (int offset, Object obj)
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{
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return insert (offset, String.valueOf(obj));
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}
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public synchronized StringBuffer insert (int offset, String str)
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{
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if (offset < 0 || offset > count)
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throw new StringIndexOutOfBoundsException (offset);
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// Note that using `null' is from JDK 1.2.
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if (str == null)
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str = "null";
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int len = str.length();
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ensureCapacity(count+len);
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System.arraycopy(value, offset, value, offset+len, count-offset);
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str.getChars(0, len, value, offset);
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count += len;
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return this;
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}
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public synchronized StringBuffer insert (int offset, char[] data)
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{
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if (offset < 0 || offset > count)
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throw new StringIndexOutOfBoundsException (offset);
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int len = data.length;
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ensureCapacity (count+len);
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System.arraycopy(value, offset, value, offset+len, count-offset);
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System.arraycopy(data, 0, value, offset, len);
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count += len;
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return this;
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}
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public int length ()
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{
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return count;
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}
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public synchronized StringBuffer reverse ()
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{
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for (int i = 0; i < count / 2; ++i)
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{
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char c = value[i];
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value[i] = value[count - i - 1];
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value[count - i - 1] = c;
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}
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return this;
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}
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public synchronized void setCharAt (int index, char ch)
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{
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if (index < 0 || index >= count)
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throw new StringIndexOutOfBoundsException (index);
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// Call ensureCapacity to enforce copy-on-write.
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ensureCapacity (count);
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value[index] = ch;
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}
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public synchronized void setLength (int newLength)
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{
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if (newLength < 0)
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throw new StringIndexOutOfBoundsException (newLength);
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ensureCapacity (newLength);
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for (int i = count; i < newLength; ++i)
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value[i] = '\0';
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count = newLength;
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}
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public StringBuffer ()
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{
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this (16);
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}
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public StringBuffer (int capacity)
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{
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count = 0;
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value = new char[capacity];
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shared = false;
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}
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public StringBuffer (String str)
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{
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// The documentation is not clear, but experimentation with
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// other implementations indicates that StringBuffer(null)
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// should throw a NullPointerException.
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count = str.length();
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// JLS: The initial capacity of the string buffer is 16 plus the
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// length of the argument string.
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value = new char[count + 16];
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str.getChars(0, count, value, 0);
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shared = false;
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}
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public String toString ()
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{
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shared = true;
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return new String (this);
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}
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// The buffer. Note that this has permissions set this way so that
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// String can get the value.
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char[] value;
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// Index of next available character. Note that this has
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// permissions set this way so that String can get the value.
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int count;
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// True if we need to copy the buffer before writing to it again.
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// FIXME: JDK 1.2 doesn't specify this. The new buffer-growing
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// semantics make this less useful in that case, too.
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private boolean shared;
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}
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