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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.lang;
import dalvik.annotation.optimization.FastNative;
import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Comparator;
import libcore.util.CharsetUtils;
import libcore.util.EmptyArray;
/**
* Class used to generate strings instead of calling String.<init>.
*
* @hide
*/
public final class StringFactory {
// TODO: Remove once native methods are in place.
private static final char REPLACEMENT_CHAR = (char) 0xfffd;
public static String newEmptyString() {
return newStringFromChars(EmptyArray.CHAR, 0, 0);
}
public static String newStringFromBytes(byte[] data) {
return newStringFromBytes(data, 0, data.length);
}
public static String newStringFromBytes(byte[] data, int high) {
return newStringFromBytes(data, high, 0, data.length);
}
public static String newStringFromBytes(byte[] data, int offset, int byteCount) {
return newStringFromBytes(data, offset, byteCount, Charset.defaultCharset());
}
@FastNative
public static native String newStringFromBytes(byte[] data, int high, int offset, int byteCount);
public static String newStringFromBytes(byte[] data, int offset, int byteCount, String charsetName) throws UnsupportedEncodingException {
return newStringFromBytes(data, offset, byteCount, Charset.forNameUEE(charsetName));
}
public static String newStringFromBytes(byte[] data, String charsetName) throws UnsupportedEncodingException {
return newStringFromBytes(data, 0, data.length, Charset.forNameUEE(charsetName));
}
// TODO: Implement this method natively.
public static String newStringFromBytes(byte[] data, int offset, int byteCount, Charset charset) {
if ((offset | byteCount) < 0 || byteCount > data.length - offset) {
throw new StringIndexOutOfBoundsException(data.length, offset, byteCount);
}
char[] value;
int length;
// We inline UTF-8, ISO-8859-1, and US-ASCII decoders for speed.
String canonicalCharsetName = charset.name();
if (canonicalCharsetName.equals("UTF-8")) {
return newStringFromUtf8Bytes(data, offset, byteCount);
} else if (canonicalCharsetName.equals("ISO-8859-1")) {
value = new char[byteCount];
length = byteCount;
CharsetUtils.isoLatin1BytesToChars(data, offset, byteCount, value);
} else if (canonicalCharsetName.equals("US-ASCII")) {
value = new char[byteCount];
length = byteCount;
CharsetUtils.asciiBytesToChars(data, offset, byteCount, value);
} else {
CharBuffer cb = charset.decode(ByteBuffer.wrap(data, offset, byteCount));
length = cb.length();
// The call to newStringFromChars below will copy length bytes out of value, so it does
// not matter that cb.array().length may be > cb.length() or that a Charset could keep a
// reference to the CharBuffer it returns and later mutate it.
value = cb.array();
}
return newStringFromChars(value, 0, length);
}
public static String newStringFromBytes(byte[] data, Charset charset) {
return newStringFromBytes(data, 0, data.length, charset);
}
public static String newStringFromChars(char[] data) {
return newStringFromChars(data, 0, data.length);
}
public static String newStringFromChars(char[] data, int offset, int charCount) {
if ((offset | charCount) < 0 || charCount > data.length - offset) {
throw new StringIndexOutOfBoundsException(data.length, offset, charCount);
}
return newStringFromChars(offset, charCount, data);
}
// The char array passed as {@code java_data} must not be a null reference.
@FastNative
static native String newStringFromChars(int offset, int charCount, char[] data);
@FastNative
public static native String newStringFromString(String toCopy);
@FastNative
public static native String newStringFromUtf8Bytes(byte[] data, int offset, int byteCount);
public static String newStringFromStringBuffer(StringBuffer stringBuffer) {
synchronized (stringBuffer) {
return newStringFromChars(stringBuffer.getValue(), 0, stringBuffer.length());
}
}
// TODO: Implement this method natively.
public static String newStringFromCodePoints(int[] codePoints, int offset, int count) {
if (codePoints == null) {
throw new NullPointerException("codePoints == null");
}
if ((offset | count) < 0 || count > codePoints.length - offset) {
throw new StringIndexOutOfBoundsException(codePoints.length, offset, count);
}
char[] value = new char[count * 2];
int end = offset + count;
int length = 0;
for (int i = offset; i < end; i++) {
length += Character.toChars(codePoints[i], value, length);
}
return newStringFromChars(value, 0, length);
}
public static String newStringFromStringBuilder(StringBuilder stringBuilder) {
return newStringFromChars(stringBuilder.getValue(), 0, stringBuilder.length());
}
}