Android Open Source - android-http String Utils

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The source code is released under:

Apache License

Java Source Code

/*
 * 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 . ja v  a2  s.  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.binary;

import java.io.UnsupportedEncodingException;

import org.apache.commons.codec.CharEncoding;

/**
 * Converts String to and from bytes using the encodings required by the Java
 * specification. These encodings are specified in <a href=
 * "http://download.oracle.com/javase/1.5.0/docs/api/java/nio/charset/Charset.html"
 * >Standard charsets</a>
 * 
 * @see CharEncoding
 * @see <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
 * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a>
 * @version $Id$
 * @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, may be <code>null</code>
   * @return encoded bytes, or <code>null</code> if the input string was <code>null</code>
   * @throws IllegalStateException
   *             Thrown when the charset is missing, which should be never
   *             according the the Java specification.
   * @see <a href="http://download.oracle.com/javase/1.5.0/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, may be <code>null</code>
   * @return encoded bytes, or <code>null</code> if the input string was <code>null</code>
   * @throws IllegalStateException
   *             Thrown when the charset is missing, which should be never
   *             according the the Java specification.
   * @see <a href="http://download.oracle.com/javase/1.5.0/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, may be <code>null</code>
   * @return encoded bytes, or <code>null</code> if the input string was <code>null</code>
   * @throws IllegalStateException
   *             Thrown when the charset is missing, which should be never
   *             according the the Java specification.
   * @see <a href="http://download.oracle.com/javase/1.5.0/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, may be <code>null</code>
   * @return encoded bytes, or <code>null</code> if the input string was <code>null</code>
   * @throws IllegalStateException
   *             Thrown when the charset is missing, which should be never
   *             according the the Java specification.
   * @see <a href="http://download.oracle.com/javase/1.5.0/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, may be <code>null</code>
   * @return encoded bytes, or <code>null</code> if the input string was <code>null</code>
   * @throws IllegalStateException
   *             Thrown when the charset is missing, which should be never
   *             according the the Java specification.
   * @see <a href="http://download.oracle.com/javase/1.5.0/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, may be <code>null</code>
   * @return encoded bytes, or <code>null</code> if the input string was <code>null</code>
   * @throws IllegalStateException
   *             Thrown when the charset is missing, which should be never
   *             according the the Java specification.
   * @see <a href="http://download.oracle.com/javase/1.5.0/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, may be <code>null</code>
   * @param charsetName
   *            The name of a required {@link java.nio.charset.Charset}
   * @return encoded bytes, or <code>null</code> if the input string was <code>null</code>
   * @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, may be <code>null</code>
   * @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, or <code>null</code> if the input
   *         byte array was <code>null</code>.
   * @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, may be <code>null</code>
   * @return A new <code>String</code> decoded from the specified array of
   *         bytes using the ISO-8859-1 charset, or <code>null</code> if the
   *         input byte array was <code>null</code>.
   * @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 US-ASCII charset, or <code>null</code> if the
   *         input byte array was <code>null</code>.
   * @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 UTF-16 charset or <code>null</code> if the input
   *         byte array was <code>null</code>.
   * @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 UTF-16BE charset, or <code>null</code> if the
   *         input byte array was <code>null</code>.
   * @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 UTF-16LE charset, or <code>null</code> if the
   *         input byte array was <code>null</code>.
   * @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 UTF-8 charset, or <code>null</code> if the input
   *         byte array was <code>null</code>.
   * @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);
  }
}

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