/**
*******************************************************************************
* Copyright (C) 1996-2005, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*
*******************************************************************************
*/
package com.ibm.icu4jni.charset;
import java.nio.charset.Charset;
import java.nio.charset.spi.CharsetProvider;
import java.util.*;
import java.util.Iterator;
// BEGIN android-removed
// import com.ibm.icu4jni.converters.NativeConverter;
// END android-removed
public final class CharsetProviderICU extends CharsetProvider{
/**
* Constructs a CharsetProviderICU object
* @stable ICU 2.4
*/
public CharsetProviderICU(){
}
/**
* Constructs a charset for the given charset name
* @param charsetName charset name
* @return charset objet for the given charset name
* @stable ICU 2.4
*/
public final Charset charsetForName(String charsetName) {
// get the canonical name
String icuCanonicalName = NativeConverter.getICUCanonicalName(charsetName);
// create the converter object and return it
if(icuCanonicalName==null || icuCanonicalName.length()==0){
// this would make the Charset API to throw
// unsupported encoding exception
return null;
}
// BEGIN android-added
try{
long cn = NativeConverter.openConverter(icuCanonicalName);
NativeConverter.closeConverter(cn);
}catch (RuntimeException re) {
// unsupported encoding. let the charset api throw an
// UnsupportedEncodingException
return null;
}
// END android-added
return getCharset(icuCanonicalName);
}
private final Charset getCharset(String icuCanonicalName){
String[] aliases = (String[])NativeConverter.getAliases(icuCanonicalName);
String canonicalName = NativeConverter.getJavaCanonicalName(icuCanonicalName);
return (new CharsetICU(canonicalName,icuCanonicalName, aliases));
}
/**
* Adds an entry to the given map whose key is the charset's
* canonical name and whose value is the charset itself.
* @param map a map to receive charset objects and names
* @stable ICU 2.4
*/
public final void putCharsets(Map map) {
// Get the available converter canonical names and aliases
String[] charsets = NativeConverter.getAvailable();
for(int i=0; i<charsets.length;i++){
// store the charsets and aliases in a Map
if (!map.containsKey(charsets[i])){
map.put(charsets[i], charsetForName(charsets[i]));
}
}
}
/**
* Class that implements the iterator for charsets
* @stable ICU 2.4
*/
protected final class CharsetIterator implements Iterator{
private String[] names;
private int currentIndex;
protected CharsetIterator(String[] strs){
names = strs;
currentIndex=0;
}
public boolean hasNext(){
return (currentIndex< names.length);
}
public Object next(){
if(currentIndex<names.length){
return charsetForName(names[currentIndex++]);
}else{
throw new NoSuchElementException();
}
}
public void remove() {
throw new UnsupportedOperationException();
}
}
/**
* Returns an iterator for the available charsets
* @return Iterator the charset name iterator
* @stable ICU 2.4
*/
public final Iterator charsets(){
String[] charsets = NativeConverter.getAvailable();
Iterator iter = new CharsetIterator(charsets);
return iter;
}
}