mirror of git://gcc.gnu.org/git/gcc.git
113 lines
3.8 KiB
Java
113 lines
3.8 KiB
Java
/* VMCPStringBuilder.java -- Growable strings without locking or copying
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Copyright (C) 2008 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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.java.lang;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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/**
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* This class provides VM support for CPStringBuilder
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* by allowing the package-private constructor
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* of java.lang.String to be invoked. The default
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* implementation uses reflection. VMs may replace
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* this class with a more efficient version.
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*/
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final class VMCPStringBuilder
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{
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/**
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* The package-private constructor for String objects without copying.
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*/
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private static final Constructor cons;
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static
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{
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try
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{
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cons = String.class.getDeclaredConstructor(new Class[] { char[].class,
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Integer.TYPE,
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Integer.TYPE,
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Boolean.TYPE });
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cons.setAccessible(true);
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}
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catch (NoSuchMethodException e)
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{
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throw (Error)
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new InternalError("Could not get no-copy String constructor").initCause(e);
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}
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}
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/**
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* Convert this <code>StringBuilder</code> to a <code>String</code>. The
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* String is composed of the characters currently in this StringBuilder. Note
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* that the result is not a copy, so the builder will allocate a new array
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* if a further write operation is attempted.
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*
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* @param value the buffered characters.
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* @param startIndex the index at which to start taking characters from the buffer.
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* @param count the number of characters used in the buffer.
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* @return the characters in this StringBuilder
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*/
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public static String toString(char[] value, int startIndex, int count)
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{
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try
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{
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return (String)
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cons.newInstance(new Object[] { value, Integer.valueOf(startIndex),
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Integer.valueOf(count),
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Boolean.valueOf(true) });
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}
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catch (InstantiationException e)
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{
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throw (Error)
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new InternalError("Could not instantiate no-copy String constructor").initCause(e);
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}
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catch (IllegalAccessException e)
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{
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throw (Error)
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new InternalError("Could not access no-copy String constructor").initCause(e);
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}
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catch (InvocationTargetException e)
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{
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throw (Error)
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new InternalError("Error calling no-copy String constructor").initCause(e);
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}
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}
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}
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