200 lines
6.8 KiB
Java
200 lines
6.8 KiB
Java
// This is a simplified copy of java.lang.StringBuffer with
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// `synchronized' removed.
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/* StringBuffer.java -- Growable strings
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Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.gcj.runtime;
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public final class StringBuffer
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{
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/** Append the <code>String</code> value of the argument to this <code>StringBuffer</code>.
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* Uses <code>String.valueOf()</code> to convert to
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* <code>String</code>.
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* @param bool the <code>boolean</code> to convert and append.
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* @return this <code>StringBuffer</code>.
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* @see java.lang.String#valueOf(boolean)
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*/
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public StringBuffer append (boolean bool)
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{
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return append (bool ? "true" : "false");
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}
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/** Append the <code>char</code> to this <code>StringBuffer</code>.
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* @param c the <code>char</code> to append.
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* @return this <code>StringBuffer</code>.
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*/
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public StringBuffer append (char ch)
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{
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ensureCapacity_unsynchronized (count + 1);
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value[count++] = ch;
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return this;
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}
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/** Append the <code>String</code> value of the argument to this <code>StringBuffer</code>.
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* Uses <code>String.valueOf()</code> to convert to
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* <code>String</code>.
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* @param inum the <code>int</code> to convert and append.
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* @return this <code>StringBuffer</code>.
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* @see java.lang.String#valueOf(int)
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*/
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public native StringBuffer append (int inum);
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/** Append the <code>String</code> value of the argument to this <code>StringBuffer</code>.
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* Uses <code>String.valueOf()</code> to convert to
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* <code>String</code>.
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* @param lnum the <code>long</code> to convert and append.
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* @return this <code>StringBuffer</code>.
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* @see java.lang.String#valueOf(long)
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*/
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public StringBuffer append (long lnum)
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{
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return append (Long.toString (lnum));
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}
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/** Append the <code>String</code> value of the argument to this <code>StringBuffer</code>.
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* Uses <code>String.valueOf()</code> to convert to
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* <code>String</code>.
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* @param fnum the <code>float</code> to convert and append.
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* @return this <code>StringBuffer</code>.
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* @see java.lang.String#valueOf(float)
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*/
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public StringBuffer append (float fnum)
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{
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return append (Float.toString (fnum));
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}
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/** Append the <code>String</code> value of the argument to this <code>StringBuffer</code>.
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* Uses <code>String.valueOf()</code> to convert to
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* <code>String</code>.
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* @param dnum the <code>double</code> to convert and append.
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* @return this <code>StringBuffer</code>.
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* @see java.lang.String#valueOf(double)
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*/
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public StringBuffer append (double dnum)
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{
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return append (Double.toString (dnum));
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}
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/** Append the <code>String</code> value of the argument to this <code>StringBuffer</code>.
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* Uses <code>String.valueOf()</code> to convert to
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* <code>String</code>.
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* @param obj the <code>Object</code> to convert and append.
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* @return this <code>StringBuffer</code>.
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* @see java.lang.String#valueOf(java.lang.Object)
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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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/** Append the <code>String</code> to this <code>StringBuffer</code>.
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* @param str the <code>String</code> to append.
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* @return this <code>StringBuffer</code>.
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*/
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public 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_unsynchronized (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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private void ensureCapacity_unsynchronized (int minimumCapacity)
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{
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if (minimumCapacity > value.length)
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{
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minimumCapacity = Math.max (minimumCapacity, value.length * 2 + 2);
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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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}
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}
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/** Create a new StringBuffer with default capacity 16.
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* @see JLS 20.13.1
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*/
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public StringBuffer ()
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{
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this (DEFAULT_CAPACITY);
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}
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/** Create an empty <code>StringBuffer</code> with the specified initial capacity.
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* @param capacity the initial capacity.
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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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}
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/** Create a new <code>StringBuffer</code> with the characters in the specified <code>String</code>.
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* Initial capacity will be the size of the String plus 16.
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* @param str the <code>String</code> to make a <code>StringBuffer</code> out of.
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*/
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public StringBuffer (String str)
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{
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if (str == null)
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str = "null";
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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 + DEFAULT_CAPACITY];
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str.getChars(0, count, value, 0);
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}
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/** Convert this <code>StringBuffer</code> to a <code>String</code>.
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* @return the characters in this StringBuffer
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*/
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// This is native because efficient implementation requires avoiding
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// the Java protection mechanism.
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public native String toString ();
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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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// 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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private final static int DEFAULT_CAPACITY = 16; // JLS 20.13.1
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}
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