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/* * 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 * //w w w . jav a 2s . c o m * 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 org.apache.commons.codec_1_4.binary; import java.io.UnsupportedEncodingException; import org.apache.commons.codec_1_4.CharEncoding; /** * Converts String to and from bytes using the encodings required by the Java specification. These encodings are specified in <a * href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * * @see CharEncoding * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a> * @version $Id: StringUtils.java 801391 2009-08-05 19:55:54Z ggregory $ * @since 1.4 */ public class StringUtils { /** * Encodes the given string into a sequence of bytes using the ISO-8859-1 charset, storing the result into a new * byte array. * * @param string * the String to encode * @return encoded bytes * @throws IllegalStateException * Thrown when the charset is missing, which should be never according the the Java specification. * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * @see #getBytesUnchecked(String, String) */ public static byte[] getBytesIso8859_1(String string) { return StringUtils.getBytesUnchecked(string, CharEncoding.ISO_8859_1); } /** * Encodes the given string into a sequence of bytes using the US-ASCII charset, storing the result into a new byte * array. * * @param string * the String to encode * @return encoded bytes * @throws IllegalStateException * Thrown when the charset is missing, which should be never according the the Java specification. * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * @see #getBytesUnchecked(String, String) */ public static byte[] getBytesUsAscii(String string) { return StringUtils.getBytesUnchecked(string, CharEncoding.US_ASCII); } /** * Encodes the given string into a sequence of bytes using the UTF-16 charset, storing the result into a new byte * array. * * @param string * the String to encode * @return encoded bytes * @throws IllegalStateException * Thrown when the charset is missing, which should be never according the the Java specification. * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * @see #getBytesUnchecked(String, String) */ public static byte[] getBytesUtf16(String string) { return StringUtils.getBytesUnchecked(string, CharEncoding.UTF_16); } /** * Encodes the given string into a sequence of bytes using the UTF-16BE charset, storing the result into a new byte * array. * * @param string * the String to encode * @return encoded bytes * @throws IllegalStateException * Thrown when the charset is missing, which should be never according the the Java specification. * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * @see #getBytesUnchecked(String, String) */ public static byte[] getBytesUtf16Be(String string) { return StringUtils.getBytesUnchecked(string, CharEncoding.UTF_16BE); } /** * Encodes the given string into a sequence of bytes using the UTF-16LE charset, storing the result into a new byte * array. * * @param string * the String to encode * @return encoded bytes * @throws IllegalStateException * Thrown when the charset is missing, which should be never according the the Java specification. * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * @see #getBytesUnchecked(String, String) */ public static byte[] getBytesUtf16Le(String string) { return StringUtils.getBytesUnchecked(string, CharEncoding.UTF_16LE); } /** * Encodes the given string into a sequence of bytes using the UTF-8 charset, storing the result into a new byte * array. * * @param string * the String to encode * @return encoded bytes * @throws IllegalStateException * Thrown when the charset is missing, which should be never according the the Java specification. * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html">Standard charsets</a> * @see #getBytesUnchecked(String, String) */ public static byte[] getBytesUtf8(String string) { return StringUtils.getBytesUnchecked(string, CharEncoding.UTF_8); } /** * Encodes the given string into a sequence of bytes using the named charset, storing the result into a new byte * array. * <p> * This method catches {@link UnsupportedEncodingException} and rethrows it as {@link IllegalStateException}, which * should never happen for a required charset name. Use this method when the encoding is required to be in the JRE. * </p> * * @param string * the String to encode * @param charsetName * The name of a required {@link java.nio.charset.Charset} * @return encoded bytes * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen for a * required charset name. * @see CharEncoding * @see String#getBytes(String) */ public static byte[] getBytesUnchecked(String string, String charsetName) { if (string == null) { return null; } try { return string.getBytes(charsetName); } catch (UnsupportedEncodingException e) { throw StringUtils.newIllegalStateException(charsetName, e); } } private static IllegalStateException newIllegalStateException(String charsetName, UnsupportedEncodingException e) { return new IllegalStateException(charsetName + ": " + e); } /** * Constructs a new <code>String</code> by decoding the specified array of bytes using the given charset. * <p> * This method catches {@link UnsupportedEncodingException} and re-throws it as {@link IllegalStateException}, which * should never happen for a required charset name. Use this method when the encoding is required to be in the JRE. * </p> * * @param bytes * The bytes to be decoded into characters * @param charsetName * The name of a required {@link java.nio.charset.Charset} * @return A new <code>String</code> decoded from the specified array of bytes using the given charset. * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen for a * required charset name. * @see CharEncoding * @see String#String(byte[], String) */ public static String newString(byte[] bytes, String charsetName) { if (bytes == null) { return null; } try { return new String(bytes, charsetName); } catch (UnsupportedEncodingException e) { throw StringUtils.newIllegalStateException(charsetName, e); } } /** * Constructs a new <code>String</code> by decoding the specified array of bytes using the ISO-8859-1 charset. * * @param bytes * The bytes to be decoded into characters * @return A new <code>String</code> decoded from the specified array of bytes using the given charset. * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen since the * charset is required. */ public static String newStringIso8859_1(byte[] bytes) { return StringUtils.newString(bytes, CharEncoding.ISO_8859_1); } /** * Constructs a new <code>String</code> by decoding the specified array of bytes using the US-ASCII charset. * * @param bytes * The bytes to be decoded into characters * @return A new <code>String</code> decoded from the specified array of bytes using the given charset. * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen since the * charset is required. */ public static String newStringUsAscii(byte[] bytes) { return StringUtils.newString(bytes, CharEncoding.US_ASCII); } /** * Constructs a new <code>String</code> by decoding the specified array of bytes using the UTF-16 charset. * * @param bytes * The bytes to be decoded into characters * @return A new <code>String</code> decoded from the specified array of bytes using the given charset. * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen since the * charset is required. */ public static String newStringUtf16(byte[] bytes) { return StringUtils.newString(bytes, CharEncoding.UTF_16); } /** * Constructs a new <code>String</code> by decoding the specified array of bytes using the UTF-16BE charset. * * @param bytes * The bytes to be decoded into characters * @return A new <code>String</code> decoded from the specified array of bytes using the given charset. * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen since the * charset is required. */ public static String newStringUtf16Be(byte[] bytes) { return StringUtils.newString(bytes, CharEncoding.UTF_16BE); } /** * Constructs a new <code>String</code> by decoding the specified array of bytes using the UTF-16LE charset. * * @param bytes * The bytes to be decoded into characters * @return A new <code>String</code> decoded from the specified array of bytes using the given charset. * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen since the * charset is required. */ public static String newStringUtf16Le(byte[] bytes) { return StringUtils.newString(bytes, CharEncoding.UTF_16LE); } /** * Constructs a new <code>String</code> by decoding the specified array of bytes using the UTF-8 charset. * * @param bytes * The bytes to be decoded into characters * @return A new <code>String</code> decoded from the specified array of bytes using the given charset. * @throws IllegalStateException * Thrown when a {@link UnsupportedEncodingException} is caught, which should never happen since the * charset is required. */ public static String newStringUtf8(byte[] bytes) { return StringUtils.newString(bytes, CharEncoding.UTF_8); } }