| /* CoderResult.java -- |
| Copyright (C) 2002, 2004 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 java.nio.charset; |
| |
| import java.lang.ref.WeakReference; |
| import java.nio.BufferOverflowException; |
| import java.nio.BufferUnderflowException; |
| import java.util.HashMap; |
| |
| /** |
| * @author Jesse Rosenstock |
| * @since 1.4 |
| */ |
| public class CoderResult |
| { |
| private static final int TYPE_MALFORMED = 0; |
| private static final int TYPE_OVERFLOW = 1; |
| private static final int TYPE_UNDERFLOW = 2; |
| private static final int TYPE_UNMAPPABLE = 3; |
| |
| public static final CoderResult OVERFLOW |
| = new CoderResult (TYPE_OVERFLOW, 0); |
| public static final CoderResult UNDERFLOW |
| = new CoderResult (TYPE_UNDERFLOW, 0); |
| |
| private static final String[] names |
| = { "MALFORMED", "OVERFLOW", "UNDERFLOW", "UNMAPPABLE" }; |
| |
| private static final Cache malformedCache |
| = new Cache () |
| { |
| protected CoderResult make (int length) |
| { |
| return new CoderResult (TYPE_MALFORMED, length); |
| } |
| }; |
| |
| private static final Cache unmappableCache |
| = new Cache () |
| { |
| protected CoderResult make (int length) |
| { |
| return new CoderResult (TYPE_UNMAPPABLE, length); |
| } |
| }; |
| |
| private final int type; |
| private final int length; |
| |
| // Package-private to avoid a trampoline constructor. |
| CoderResult (int type, int length) |
| { |
| this.type = type; |
| this.length = length; |
| } |
| |
| public boolean isError () |
| { |
| return length > 0; |
| } |
| |
| public boolean isMalformed () |
| { |
| return type == TYPE_MALFORMED; |
| } |
| |
| public boolean isOverflow () |
| { |
| return type == TYPE_OVERFLOW; |
| } |
| |
| public boolean isUnderflow () |
| { |
| return type == TYPE_UNDERFLOW; |
| } |
| |
| public boolean isUnmappable () |
| { |
| return type == TYPE_UNMAPPABLE; |
| } |
| |
| public int length () |
| { |
| if (length <= 0) |
| throw new UnsupportedOperationException (); |
| else |
| return length; |
| } |
| |
| public static CoderResult malformedForLength (int length) |
| { |
| return malformedCache.get (length); |
| } |
| |
| public void throwException () |
| throws CharacterCodingException |
| { |
| switch (type) |
| { |
| case TYPE_MALFORMED: |
| throw new MalformedInputException (length); |
| case TYPE_OVERFLOW: |
| throw new BufferOverflowException (); |
| case TYPE_UNDERFLOW: |
| throw new BufferUnderflowException (); |
| case TYPE_UNMAPPABLE: |
| throw new UnmappableCharacterException (length); |
| } |
| } |
| |
| public String toString () |
| { |
| String name = names[type]; |
| return (length > 0) ? name + '[' + length + ']' : name; |
| } |
| |
| public static CoderResult unmappableForLength (int length) |
| { |
| return unmappableCache.get (length); |
| } |
| |
| private abstract static class Cache |
| { |
| private final HashMap cache; |
| |
| // Package-private to avoid a trampoline constructor. |
| Cache () |
| { |
| cache = new HashMap (); |
| } |
| |
| // Package-private to avoid a trampoline. |
| synchronized CoderResult get (int length) |
| { |
| if (length <= 0) |
| throw new IllegalArgumentException ("Non-positive length"); |
| |
| Integer len = new Integer (length); |
| CoderResult cr = null; |
| Object o; |
| if ((o = cache.get (len)) != null) |
| cr = (CoderResult) ((WeakReference) o).get (); |
| if (cr == null) |
| { |
| cr = make (length); |
| cache.put (len, new WeakReference (cr)); |
| } |
| |
| return cr; |
| } |
| |
| protected abstract CoderResult make (int length); |
| } |
| } |