Coverage Report - org.apache.commons.lang3.text.translate.CharSequenceTranslator
 
Classes in this File Line Coverage Branch Coverage Complexity
CharSequenceTranslator
94%
34/36
88%
16/18
4
 
 1  
 /*
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  You may obtain a copy of the License at
 8  
  * 
 9  
  *      http://www.apache.org/licenses/LICENSE-2.0
 10  
  * 
 11  
  * Unless required by applicable law or agreed to in writing, software
 12  
  * distributed under the License is distributed on an "AS IS" BASIS,
 13  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14  
  * See the License for the specific language governing permissions and
 15  
  * limitations under the License.
 16  
  */
 17  
 package org.apache.commons.lang3.text.translate;
 18  
 
 19  
 import java.io.IOException;
 20  
 import java.io.StringWriter;
 21  
 import java.io.Writer;
 22  
 import java.util.Locale;
 23  
 
 24  
 /**
 25  
  * An API for translating text. 
 26  
  * Its core use is to escape and unescape text. Because escaping and unescaping 
 27  
  * is completely contextual, the API does not present two separate signatures.
 28  
  * 
 29  
  * @since 3.0
 30  
  * @version $Id: CharSequenceTranslator.java 1666535 2015-03-13 18:18:59Z britter $
 31  
  */
 32  88
 public abstract class CharSequenceTranslator {
 33  
 
 34  1
     static final char[] HEX_DIGITS = new char[] {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
 35  
 
 36  
     /**
 37  
      * Translate a set of codepoints, represented by an int index into a CharSequence, 
 38  
      * into another set of codepoints. The number of codepoints consumed must be returned, 
 39  
      * and the only IOExceptions thrown must be from interacting with the Writer so that 
 40  
      * the top level API may reliably ignore StringWriter IOExceptions. 
 41  
      *
 42  
      * @param input CharSequence that is being translated
 43  
      * @param index int representing the current point of translation
 44  
      * @param out Writer to translate the text to
 45  
      * @return int count of codepoints consumed
 46  
      * @throws IOException if and only if the Writer produces an IOException
 47  
      */
 48  
     public abstract int translate(CharSequence input, int index, Writer out) throws IOException;
 49  
 
 50  
     /**
 51  
      * Helper for non-Writer usage. 
 52  
      * @param input CharSequence to be translated
 53  
      * @return String output of translation
 54  
      */
 55  
     public final String translate(final CharSequence input) {
 56  65925
         if (input == null) {
 57  10
             return null;
 58  
         }
 59  
         try {
 60  65915
             final StringWriter writer = new StringWriter(input.length() * 2);
 61  65915
             translate(input, writer);
 62  65912
             return writer.toString();
 63  0
         } catch (final IOException ioe) {
 64  
             // this should never ever happen while writing to a StringWriter
 65  0
             throw new RuntimeException(ioe);
 66  
         }
 67  
     }
 68  
 
 69  
     /**
 70  
      * Translate an input onto a Writer. This is intentionally final as its algorithm is 
 71  
      * tightly coupled with the abstract method of this class. 
 72  
      *
 73  
      * @param input CharSequence that is being translated
 74  
      * @param out Writer to translate the text to
 75  
      * @throws IOException if and only if the Writer produces an IOException
 76  
      */
 77  
     public final void translate(final CharSequence input, final Writer out) throws IOException {
 78  65987
         if (out == null) {
 79  8
             throw new IllegalArgumentException("The Writer must not be null");
 80  
         }
 81  65979
         if (input == null) {
 82  4
             return;
 83  
         }
 84  65975
         int pos = 0;
 85  65975
         final int len = input.length();
 86  210299
         while (pos < len) {
 87  144327
             final int consumed = translate(input, pos, out);
 88  144324
             if (consumed == 0) {
 89  
                 // inlined implementation of Character.toChars(Character.codePointAt(input, pos))
 90  
                 // avoids allocating temp char arrays and duplicate checks
 91  10794
                 char c1 = input.charAt(pos);
 92  10794
                 out.write(c1);
 93  10794
                 pos++;
 94  10794
                 if (Character.isHighSurrogate(c1) && pos < len) {
 95  8
                     char c2 = input.charAt(pos);
 96  8
                     if (Character.isLowSurrogate(c2)) {
 97  8
                       out.write(c2);
 98  8
                       pos++;
 99  
                     }
 100  8
                 }
 101  
                 continue;
 102  
             }
 103  
             // contract with translators is that they have to understand codepoints
 104  
             // and they just took care of a surrogate pair
 105  1176295
             for (int pt = 0; pt < consumed; pt++) {
 106  1042765
                 pos += Character.charCount(Character.codePointAt(input, pos));
 107  
             }
 108  133530
         }
 109  65972
     }
 110  
 
 111  
     /**
 112  
      * Helper method to create a merger of this translator with another set of 
 113  
      * translators. Useful in customizing the standard functionality.
 114  
      *
 115  
      * @param translators CharSequenceTranslator array of translators to merge with this one
 116  
      * @return CharSequenceTranslator merging this translator with the others
 117  
      */
 118  
     public final CharSequenceTranslator with(final CharSequenceTranslator... translators) {
 119  4
         final CharSequenceTranslator[] newArray = new CharSequenceTranslator[translators.length + 1];
 120  4
         newArray[0] = this;
 121  4
         System.arraycopy(translators, 0, newArray, 1, translators.length);
 122  4
         return new AggregateTranslator(newArray);
 123  
     }
 124  
 
 125  
     /**
 126  
      * <p>Returns an upper case hexadecimal <code>String</code> for the given
 127  
      * character.</p>
 128  
      *
 129  
      * @param codepoint The codepoint to convert.
 130  
      * @return An upper case hexadecimal <code>String</code>
 131  
      */
 132  
     public static String hex(final int codepoint) {
 133  28
         return Integer.toHexString(codepoint).toUpperCase(Locale.ENGLISH);
 134  
     }
 135  
 
 136  
 }