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annotate src/luan/lib/Utils.java @ 115:eacf6ce1b47d

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add IoLib git-svn-id: https://luan-java.googlecode.com/svn/trunk@116 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 29 May 2014 09:26:44 +0000
parents 6ca02b188dba
children 1ff1c32417eb
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1 package luan.lib;
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3 import java.io.File;
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4 import java.io.FileReader;
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5 import java.io.FileWriter;
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6 import java.io.InputStreamReader;
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7 import java.io.Reader;
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8 import java.io.Writer;
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9 import java.io.IOException;
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10 import java.io.ByteArrayInputStream;
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11 import java.io.ByteArrayOutputStream;
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12 import java.io.FileInputStream;
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13 import java.io.FileOutputStream;
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14 import java.io.InputStream;
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15 import java.io.OutputStream;
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16 import java.net.URL;
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17 import luan.LuanState;
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18 import luan.LuanException;
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19 import luan.LuanElement;
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22 public final class Utils {
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23 private Utils() {} // never
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25 private static final int bufSize = 8192;
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27 public static void checkNotNull(LuanState luan,Object v,String expected) throws LuanException {
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28 if( v == null )
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29 throw luan.JAVA.exception("bad argument #1 ("+expected+" expected, got nil)");
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30 }
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32 public static String readAll(Reader in)
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33 throws IOException
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34 {
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35 char[] a = new char[bufSize];
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36 StringBuilder buf = new StringBuilder();
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37 int n;
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38 while( (n=in.read(a)) != -1 ) {
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39 buf.append(a,0,n);
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40 }
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41 return buf.toString();
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42 }
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44 public static String read(File file)
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45 throws IOException
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46 {
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47 Reader in = new FileReader(file);
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48 String s = readAll(in);
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49 in.close();
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50 return s;
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51 }
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53 public static String read(URL url)
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54 throws IOException
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55 {
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56 Reader in = new InputStreamReader(url.openStream());
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57 String s = readAll(in);
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58 in.close();
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59 return s;
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60 }
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61
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62 public static void copyAll(InputStream in,OutputStream out)
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63 throws IOException
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64 {
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65 byte[] a = new byte[bufSize];
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66 int n;
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67 while( (n=in.read(a)) != -1 ) {
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68 out.write(a,0,n);
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69 }
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70 }
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72 public static byte[] readAll(File file)
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73 throws IOException
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74 {
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75 int len = (int)file.length();
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76 ByteArrayOutputStream out = new ByteArrayOutputStream(len) {
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77 public byte[] toByteArray() {
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78 return buf;
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79 }
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80 };
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81 FileInputStream in = new FileInputStream(file);
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82 copyAll(in,out);
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83 in.close();
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84 return out.toByteArray();
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85 }
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86
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87 public static void write(File file,String s)
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88 throws IOException
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89 {
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90 Writer out = new FileWriter(file);
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91 out.write(s);
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92 out.close();
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93 }
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95 public static void writeAll(byte[] a,OutputStream out)
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96 throws IOException
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97 {
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98 copyAll(new ByteArrayInputStream(a),out);
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99 }
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101 public static void writeAll(File file,byte[] a)
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102 throws IOException
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103 {
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104 FileOutputStream fos = new FileOutputStream(file);
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105 writeAll(a,fos);
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106 fos.close();
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107 }
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108
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109 public static byte[] readAll(InputStream in)
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110 throws IOException
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111 {
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112 ByteArrayOutputStream out = new ByteArrayOutputStream();
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113 copyAll(in,out);
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114 return out.toByteArray();
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115 }
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116
75
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117 }