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cache Native2AsciiCharset instances (there are too many strings retained via charset name otherwise)

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This commit is contained in:
Alexey Kudravtsev
2013-04-26 15:06:36 +04:00
parent e21648bf07
commit 6f6593a783
1 changed files with 15 additions and 3 deletions
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platform/boot/src/com/intellij/lang/properties/charset/Native2AsciiCharset.java
+15 -3
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@@ -17,18 +17,21 @@
package com.intellij.lang.properties.charset;
import java.nio.charset.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* @author Alexey
*/
public class Native2AsciiCharset extends Charset {
private static final String[] ALIASES = new String[0];
private final Charset myBaseCharset;
@SuppressWarnings({"HardCodedStringLiteral"}) private static final String NAME_PREFIX = "NATIVE_TO_ASCII_";
@SuppressWarnings({"HardCodedStringLiteral"}) private static final String DEFAULT_ENCODING_NAME = "ISO-8859-1";
private Native2AsciiCharset(String canonicalName) {
super(canonicalName, null);
super(canonicalName, ALIASES);
String baseCharsetName = canonicalName.substring(NAME_PREFIX.length());
Charset baseCharset = null;
try {
@@ -70,14 +73,21 @@ public class Native2AsciiCharset extends Charset {
if (baseCharsetName == null) baseCharsetName = DEFAULT_ENCODING_NAME;
return NAME_PREFIX + baseCharsetName;
}
public static Charset forName(String charsetName) {
if (charsetName.startsWith(NAME_PREFIX)) {
return new Native2AsciiCharset(charsetName);
Native2AsciiCharset cached = cache.get(charsetName);
if (cached == null) {
cached = new Native2AsciiCharset(charsetName);
Native2AsciiCharset prev = cache.putIfAbsent(charsetName, cached);
if (prev != null) cached = prev;
}
return cached;
}
return null;
}
public static Charset wrap(Charset baseCharset) {
return new Native2AsciiCharset(NAME_PREFIX + baseCharset.name());
return forName(NAME_PREFIX + baseCharset.name());
}
public static Charset nativeToBaseCharset(Charset charset) {
@@ -86,4 +96,6 @@ public class Native2AsciiCharset extends Charset {
}
return charset;
}
private static final ConcurrentMap<String, Native2AsciiCharset> cache = new ConcurrentHashMap<String, Native2AsciiCharset>();
}