| /* |
| * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/EncodingUtils.java $ |
| * $Revision: 503413 $ |
| * $Date: 2007-02-04 06:22:14 -0800 (Sun, 04 Feb 2007) $ |
| * |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.http.util; |
| |
| import java.io.UnsupportedEncodingException; |
| |
| import org.apache.http.protocol.HTTP; |
| |
| /** |
| * The home for utility methods that handle various encoding tasks. |
| * |
| * @author Michael Becke |
| * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> |
| * |
| * @since 4.0 |
| */ |
| public final class EncodingUtils { |
| |
| /** |
| * Converts the byte array of HTTP content characters to a string. If |
| * the specified charset is not supported, default system encoding |
| * is used. |
| * |
| * @param data the byte array to be encoded |
| * @param offset the index of the first byte to encode |
| * @param length the number of bytes to encode |
| * @param charset the desired character encoding |
| * @return The result of the conversion. |
| */ |
| public static String getString( |
| final byte[] data, |
| int offset, |
| int length, |
| String charset |
| ) { |
| |
| if (data == null) { |
| throw new IllegalArgumentException("Parameter may not be null"); |
| } |
| |
| if (charset == null || charset.length() == 0) { |
| throw new IllegalArgumentException("charset may not be null or empty"); |
| } |
| |
| try { |
| return new String(data, offset, length, charset); |
| } catch (UnsupportedEncodingException e) { |
| return new String(data, offset, length); |
| } |
| } |
| |
| |
| /** |
| * Converts the byte array of HTTP content characters to a string. If |
| * the specified charset is not supported, default system encoding |
| * is used. |
| * |
| * @param data the byte array to be encoded |
| * @param charset the desired character encoding |
| * @return The result of the conversion. |
| */ |
| public static String getString(final byte[] data, final String charset) { |
| if (data == null) { |
| throw new IllegalArgumentException("Parameter may not be null"); |
| } |
| return getString(data, 0, data.length, charset); |
| } |
| |
| /** |
| * Converts the specified string to a byte array. If the charset is not supported the |
| * default system charset is used. |
| * |
| * @param data the string to be encoded |
| * @param charset the desired character encoding |
| * @return The resulting byte array. |
| */ |
| public static byte[] getBytes(final String data, final String charset) { |
| |
| if (data == null) { |
| throw new IllegalArgumentException("data may not be null"); |
| } |
| |
| if (charset == null || charset.length() == 0) { |
| throw new IllegalArgumentException("charset may not be null or empty"); |
| } |
| |
| try { |
| return data.getBytes(charset); |
| } catch (UnsupportedEncodingException e) { |
| return data.getBytes(); |
| } |
| } |
| |
| /** |
| * Converts the specified string to byte array of ASCII characters. |
| * |
| * @param data the string to be encoded |
| * @return The string as a byte array. |
| */ |
| public static byte[] getAsciiBytes(final String data) { |
| |
| if (data == null) { |
| throw new IllegalArgumentException("Parameter may not be null"); |
| } |
| |
| try { |
| return data.getBytes(HTTP.US_ASCII); |
| } catch (UnsupportedEncodingException e) { |
| throw new Error("HttpClient requires ASCII support"); |
| } |
| } |
| |
| /** |
| * Converts the byte array of ASCII characters to a string. This method is |
| * to be used when decoding content of HTTP elements (such as response |
| * headers) |
| * |
| * @param data the byte array to be encoded |
| * @param offset the index of the first byte to encode |
| * @param length the number of bytes to encode |
| * @return The string representation of the byte array |
| */ |
| public static String getAsciiString(final byte[] data, int offset, int length) { |
| |
| if (data == null) { |
| throw new IllegalArgumentException("Parameter may not be null"); |
| } |
| |
| try { |
| return new String(data, offset, length, HTTP.US_ASCII); |
| } catch (UnsupportedEncodingException e) { |
| throw new Error("HttpClient requires ASCII support"); |
| } |
| } |
| |
| /** |
| * Converts the byte array of ASCII characters to a string. This method is |
| * to be used when decoding content of HTTP elements (such as response |
| * headers) |
| * |
| * @param data the byte array to be encoded |
| * @return The string representation of the byte array |
| */ |
| public static String getAsciiString(final byte[] data) { |
| if (data == null) { |
| throw new IllegalArgumentException("Parameter may not be null"); |
| } |
| return getAsciiString(data, 0, data.length); |
| } |
| |
| /** |
| * This class should not be instantiated. |
| */ |
| private EncodingUtils() { |
| } |
| |
| } |