| /* |
| * 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()); |
| } |
| } |