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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 
     18 package vogar.util;
     19 
     20 //import com.google.common.collect.Lists;
     21 import java.io.BufferedReader;
     22 import java.io.File;
     23 import java.io.FileInputStream;
     24 import java.io.IOException;
     25 import java.io.InputStreamReader;
     26 import java.io.Reader;
     27 import java.util.ArrayList;
     28 import java.util.Arrays;
     29 import java.util.Collection;
     30 import java.util.Iterator;
     31 import java.util.List;
     32 import java.util.regex.Matcher;
     33 import java.util.regex.Pattern;
     34 
     35 /**
     36  * Utility methods for strings.
     37  */
     38 public class Strings {
     39 
     40     private static final Pattern XML_INVALID_CHARS
     41             = Pattern.compile("[^\\u0009\\u000A\\u000D\\u0020-\\uD7FF\\uE000-\\uFFFD]+");
     42 
     43     public static String readStream(Reader reader) throws IOException {
     44         StringBuilder result = new StringBuilder();
     45         BufferedReader in = new BufferedReader(reader);
     46         String line;
     47         while ((line = in.readLine()) != null) {
     48             result.append(line);
     49             result.append('\n');
     50         }
     51         in.close();
     52         return result.toString();
     53     }
     54 
     55     public static String readFile(File f) throws IOException {
     56         return readStream(new InputStreamReader(new FileInputStream(f), "UTF-8"));
     57     }
     58 
     59     public static List<String> readFileLines(File f) throws IOException {
     60         BufferedReader in =
     61                 new BufferedReader(new InputStreamReader(new FileInputStream(f), "UTF-8"));
     62         List<String> list = new ArrayList<String>();
     63         String line;
     64         while ((line = in.readLine()) != null) {
     65             list.add(line);
     66         }
     67         in.close();
     68         return list;
     69     }
     70 
     71     public static String join(String delimiter, Object... objects) {
     72         return join(Arrays.asList(objects), delimiter);
     73     }
     74 
     75     public static String join(Iterable<?> objects, String delimiter) {
     76         Iterator<?> i = objects.iterator();
     77         if (!i.hasNext()) {
     78             return "";
     79         }
     80 
     81         StringBuilder result = new StringBuilder();
     82         result.append(i.next());
     83         while(i.hasNext()) {
     84             result.append(delimiter).append(i.next());
     85         }
     86         return result.toString();
     87     }
     88 
     89     public static String[] objectsToStrings(Object[] objects) {
     90         String[] result = new String[objects.length];
     91         int i = 0;
     92         for (Object o : objects) {
     93             result[i++] = o.toString();
     94         }
     95         return result;
     96     }
     97 
     98     public static String[] objectsToStrings(Collection<?> objects) {
     99         return objectsToStrings(objects.toArray());
    100     }
    101 
    102     /**
    103      * Replaces XML-invalid characters with the corresponding U+XXXX code point escapes.
    104      */
    105     public static String xmlSanitize(String text) {
    106         StringBuffer result = new StringBuffer();
    107         Matcher matcher = XML_INVALID_CHARS.matcher(text);
    108         while (matcher.find()) {
    109             matcher.appendReplacement(result, "");
    110             result.append(escapeCodePoint(matcher.group()));
    111         }
    112         matcher.appendTail(result);
    113         return result.toString();
    114     }
    115 
    116     private static String escapeCodePoint(CharSequence cs) {
    117         StringBuilder result = new StringBuilder();
    118         for (int i = 0; i < cs.length(); ++i) {
    119             result.append(String.format("U+%04X", (int) cs.charAt(i)));
    120         }
    121         return result.toString();
    122     }
    123 }
    124