--- /dev/null
+/* 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);
+ }
+}
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