src/java.base/share/classes/java/nio/charset/CoderResult.java
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@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
@@ -25,13 +25,12 @@
package java.nio.charset;
import java.lang.ref.WeakReference;
import java.nio.*;
+import java.util.concurrent.ConcurrentHashMap;
import java.util.Map;
-import java.util.HashMap;
-
/**
* A description of the result state of a coder.
*
* <p> A charset coder, that is, either a decoder or an encoder, consumes bytes
@@ -195,65 +194,84 @@
private Map<Integer,WeakReference<CoderResult>> cache = null;
protected abstract CoderResult create(int len);
- private synchronized CoderResult get(int len) {
- if (len <= 0)
- throw new IllegalArgumentException("Non-positive length");
+ private CoderResult get(int len) {
Integer k = len;
WeakReference<CoderResult> w;
CoderResult e = null;
if (cache == null) {
- cache = new HashMap<>();
+ cache = new ConcurrentHashMap<>();
} else if ((w = cache.get(k)) != null) {
e = w.get();
}
if (e == null) {
e = create(len);
cache.put(k, new WeakReference<>(e));
}
return e;
}
-
}
- private static Cache malformedCache
+ private static final Cache malformedCache
= new Cache() {
public CoderResult create(int len) {
return new CoderResult(CR_MALFORMED, len);
}};
+ private static final CoderResult[] malformed4 = new CoderResult[] {
+ new CoderResult(CR_MALFORMED, 1),
+ new CoderResult(CR_MALFORMED, 2),
+ new CoderResult(CR_MALFORMED, 3),
+ new CoderResult(CR_MALFORMED, 4),
+ };
+
/**
* Static factory method that returns the unique object describing a
* malformed-input error of the given length.
*
* @param length
* The given length
*
* @return The requested coder-result object
*/
public static CoderResult malformedForLength(int length) {
+ if (length <= 0)
+ throw new IllegalArgumentException("Non-positive length");
+ if (length <= 4)
+ return malformed4[length - 1];
return malformedCache.get(length);
}
- private static Cache unmappableCache
+ private static final Cache unmappableCache
= new Cache() {
public CoderResult create(int len) {
return new CoderResult(CR_UNMAPPABLE, len);
}};
+ private static final CoderResult[] unmappable4 = new CoderResult[] {
+ new CoderResult(CR_UNMAPPABLE, 1),
+ new CoderResult(CR_UNMAPPABLE, 2),
+ new CoderResult(CR_UNMAPPABLE, 3),
+ new CoderResult(CR_UNMAPPABLE, 4),
+ };
+
/**
* Static factory method that returns the unique result object describing
* an unmappable-character error of the given length.
*
* @param length
* The given length
*
* @return The requested coder-result object
*/
public static CoderResult unmappableForLength(int length) {
+ if (length <= 0)
+ throw new IllegalArgumentException("Non-positive length");
+ if (length <= 4)
+ return unmappable4[length - 1];
return unmappableCache.get(length);
}
/**
* Throws an exception appropriate to the result described by this object.