| /* VMCPStringBuilder.java -- Growable strings without locking or copying |
| Copyright (C) 2008 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.java.lang; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| |
| /** |
| * This class provides VM support for CPStringBuilder |
| * by allowing the package-private constructor |
| * of java.lang.String to be invoked. The default |
| * implementation uses reflection. VMs may replace |
| * this class with a more efficient version. |
| */ |
| final class VMCPStringBuilder |
| { |
| |
| /** |
| * The package-private constructor for String objects without copying. |
| */ |
| private static final Constructor cons; |
| |
| static |
| { |
| try |
| { |
| cons = String.class.getDeclaredConstructor(new Class[] { char[].class, |
| Integer.TYPE, |
| Integer.TYPE, |
| Boolean.TYPE }); |
| cons.setAccessible(true); |
| } |
| catch (NoSuchMethodException e) |
| { |
| throw (Error) |
| new InternalError("Could not get no-copy String constructor").initCause(e); |
| } |
| } |
| |
| /** |
| * Convert this <code>StringBuilder</code> to a <code>String</code>. The |
| * String is composed of the characters currently in this StringBuilder. Note |
| * that the result is not a copy, so the builder will allocate a new array |
| * if a further write operation is attempted. |
| * |
| * @param value the buffered characters. |
| * @param startIndex the index at which to start taking characters from the buffer. |
| * @param count the number of characters used in the buffer. |
| * @return the characters in this StringBuilder |
| */ |
| public static String toString(char[] value, int startIndex, int count) |
| { |
| try |
| { |
| return (String) |
| cons.newInstance(new Object[] { value, Integer.valueOf(startIndex), |
| Integer.valueOf(count), |
| Boolean.valueOf(true) }); |
| } |
| catch (InstantiationException e) |
| { |
| throw (Error) |
| new InternalError("Could not instantiate no-copy String constructor").initCause(e); |
| } |
| catch (IllegalAccessException e) |
| { |
| throw (Error) |
| new InternalError("Could not access no-copy String constructor").initCause(e); |
| } |
| catch (InvocationTargetException e) |
| { |
| throw (Error) |
| new InternalError("Error calling no-copy String constructor").initCause(e); |
| } |
| } |
| |
| } |