/*
    * ====================================================================
    * 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 org.junit.Assert;
  import org.junit.Test;
  
  /**
   * Unit tests for {@link TestEncodingUtils}.
   *
   */
  public class TestEncodingUtils {
  
      private static String constructString(final int [] unicodeChars) {
          final StringBuilder buffer = new StringBuilder();
          if (unicodeChars != null) {
              for (final int unicodeChar : unicodeChars) {
                  buffer.append((char)unicodeChar);
              }
          }
          return buffer.toString();
      }
  
      static final int SWISS_GERMAN_HELLO [] = {
              0x47, 0x72, 0xFC, 0x65, 0x7A, 0x69, 0x5F, 0x7A, 0xE4, 0x6D, 0xE4
          };
  
      @Test
      public void testBytesToString() throws Exception {
          final String s = constructString(SWISS_GERMAN_HELLO);
          final byte[] utf = s.getBytes("UTF-8");
          final byte[] latin1 = s.getBytes("ISO-8859-1");
  
          final String s1 = EncodingUtils.getString(utf, "UTF-8");
          final String s2 = EncodingUtils.getString(latin1, "ISO-8859-1");
  
          Assert.assertEquals(s, s1);
          Assert.assertEquals(s, s2);
  
          try {
              EncodingUtils.getString(null, 0, 0, "UTF-8");
              Assert.fail("IllegalArgumentException should have been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
          try {
              EncodingUtils.getString(null, "UTF-8");
              Assert.fail("IllegalArgumentException should have been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
          try {
              EncodingUtils.getString(new byte[] {}, null);
              Assert.fail("IllegalArgumentException should have been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
          try {
              EncodingUtils.getString(new byte[] {}, "");
              Assert.fail("IllegalArgumentException should have been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
      }
  
      @Test
      public void testStringToBytesToString() throws Exception {
          final String s = constructString(SWISS_GERMAN_HELLO);
          final byte[] utf = s.getBytes("UTF-8");
          final byte[] latin1 = s.getBytes("ISO-8859-1");
  
          final byte[] data1 = EncodingUtils.getBytes(s, "UTF-8");
          final byte[] data2 = EncodingUtils.getBytes(s, "ISO-8859-1");
  
         Assert.assertNotNull(data1);
         Assert.assertEquals(utf.length, data1.length);
         for (int i = 0; i < utf.length; i++) {
             Assert.assertEquals(utf[i], data1[i]);
         }
         Assert.assertNotNull(data2);
         Assert.assertEquals(latin1.length, data2.length);
         for (int i = 0; i < latin1.length; i++) {
             Assert.assertEquals(latin1[i], data2[i]);
         }
 
         try {
             EncodingUtils.getBytes(null, "UTF-8");
             Assert.fail("IllegalArgumentException should have been thrown");
         } catch (final IllegalArgumentException ex) {
             // expected
         }
         try {
             EncodingUtils.getBytes("what not", null);
             Assert.fail("IllegalArgumentException should have been thrown");
         } catch (final IllegalArgumentException ex) {
             // expected
         }
         try {
             EncodingUtils.getBytes("what not", "");
             Assert.fail("IllegalArgumentException should have been thrown");
         } catch (final IllegalArgumentException ex) {
             // expected
         }
     }
 
     @Test
     public void testAsciiBytesToString() throws Exception {
         final String s = "ascii only, I mean it!";
         Assert.assertEquals(s, EncodingUtils.getAsciiString(s.getBytes("US-ASCII")));
         try {
             EncodingUtils.getAsciiString(null);
             Assert.fail("IllegalArgumentException should have been thrown");
         } catch (final IllegalArgumentException ex) {
             // expected
         }
         try {
             EncodingUtils.getAsciiString(null, 0, 0);
             Assert.fail("IllegalArgumentException should have been thrown");
         } catch (final IllegalArgumentException ex) {
             // expected
         }
     }
 
     @Test
     public void testAsciiStringToBytes() throws Exception {
         final String s = "ascii only, I mean it!";
         final byte[] ascii = s.getBytes("US-ASCII");
         final byte[] data = EncodingUtils.getAsciiBytes(s);
 
         Assert.assertNotNull(data);
         Assert.assertEquals(ascii.length, data.length);
         for (int i = 0; i < ascii.length; i++) {
             Assert.assertEquals(ascii[i], data[i]);
         }
         try {
             EncodingUtils.getAsciiBytes(null);
             Assert.fail("IllegalArgumentException should have been thrown");
         } catch (final IllegalArgumentException ex) {
             // expected
         }
     }
 
     @Test
     public void testUnsupportedEncoding() {
         final String s = constructString(SWISS_GERMAN_HELLO);
         final byte[] b1 = s.getBytes();
         final byte[] b2 = EncodingUtils.getBytes(s, "ThisJustAintRight");
         Assert.assertEquals(b1.length, b2.length);
         for (int i = 0; i < b1.length; i++) {
             Assert.assertEquals(b1[i], b2[i]);
         }
         final String s1 = new String(b1);
         final String s2 = EncodingUtils.getString(b1, "ThisJustAintRight");
         Assert.assertEquals(s1, s2);
     }
 
 }