diff options
author | Andrew John Hughes <gnu_andrew@member.fsf.org> | 2008-03-17 00:14:33 +0000 |
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committer | Andrew John Hughes <gnu_andrew@member.fsf.org> | 2008-03-17 00:14:33 +0000 |
commit | de5e60dddb2e7298d7faa711e5d1a592d4d8de67 (patch) | |
tree | 114b5bc593b0d72183855b9a1a3ffbbfd08ff34e /vm | |
parent | b2803df75b4687bc889f0ac81ab968f4434b990e (diff) | |
download | classpath-de5e60dddb2e7298d7faa711e5d1a592d4d8de67.tar.gz |
2008-03-17 Andrew John Hughes <gnu_andrew@member.fsf.org>
* gnu/java/lang/CPStringBuilder.java:
Replace reflection code with calls to
VMCPStringBuilder.
* vm/reference/gnu/java/lang/VMCPStringBuilder.java:
Default implementation of constructor call
using reflection.
Diffstat (limited to 'vm')
-rw-r--r-- | vm/reference/gnu/java/lang/VMCPStringBuilder.java | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/vm/reference/gnu/java/lang/VMCPStringBuilder.java b/vm/reference/gnu/java/lang/VMCPStringBuilder.java new file mode 100644 index 000000000..925f5643d --- /dev/null +++ b/vm/reference/gnu/java/lang/VMCPStringBuilder.java @@ -0,0 +1,107 @@ +/* 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<String> cons; + + static + { + try + { + cons = String.class.getDeclaredConstructor(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 future modifications to this buffer + * do affect the String. + * + * @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 cons.newInstance(value, startIndex, count, 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); + } + } + +} |