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annotate src/luan/modules/Utils.java @ 1493:471ef3e6a84e

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more io
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 03 May 2020 00:12:15 -0600
parents 225808b90cee
children 0ba144491a42
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rev   line source
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4c0131c2b650 merge luan/lib into modules
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1 package luan.modules;
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2
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3 import java.io.Reader;
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4 import java.io.IOException;
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5 import java.io.ByteArrayOutputStream;
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6 import java.io.InputStream;
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7 import java.io.OutputStream;
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8 import java.io.File;
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9 import java.io.InputStreamReader;
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10 import java.net.URL;
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11 import java.net.MalformedURLException;
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12 import java.util.Map;
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13 import goodjava.io.IoUtils;
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14 import luan.Luan;
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15 import luan.LuanException;
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16 import luan.LuanTable;
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17 import luan.LuanFunction;
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19
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20 public final class Utils {
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21 private Utils() {} // never
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22
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23 static final int bufSize = 8192;
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24
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25 private static void checkNotNull(Object v,String expected,int pos) throws LuanException {
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26 if( v == null )
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27 throw new LuanException("bad argument #"+pos+" ("+expected+" expected, got nil)");
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28 }
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29
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30 public static void checkNotNull(String s,int pos) throws LuanException {
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31 checkNotNull(s,"string",pos);
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32 }
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33
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34 public static void checkNotNull(String s) throws LuanException {
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35 checkNotNull(s,1);
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36 }
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37
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38 public static void checkNotNull(byte[] b,int pos) throws LuanException {
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39 checkNotNull(b,"binary",pos);
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40 }
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41
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42 public static void checkNotNull(byte[] b) throws LuanException {
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43 checkNotNull(b,1);
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44 }
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45
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46 public static void checkNotNull(LuanTable t,int pos) throws LuanException {
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47 checkNotNull(t,"table",pos);
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48 }
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50 public static void checkNotNull(LuanTable t) throws LuanException {
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51 checkNotNull(t,1);
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52 }
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53
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54 public static void checkNotNull(Number n,int pos) throws LuanException {
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55 checkNotNull(n,"number",pos);
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56 }
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58 public static void checkNotNull(Number n) throws LuanException {
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59 checkNotNull(n,1);
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60 }
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61
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62 public static void checkNotNull(LuanFunction fn,int pos) throws LuanException {
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63 checkNotNull(fn,"function",pos);
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64 }
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65
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66 public static void checkNotNull(LuanFunction fn) throws LuanException {
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67 checkNotNull(fn,1);
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68 }
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70 public static String readAll(Reader in)
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71 throws IOException
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72 {
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73 char[] a = new char[bufSize];
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74 StringBuilder buf = new StringBuilder();
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75 int n;
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76 while( (n=in.read(a)) != -1 ) {
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77 buf.append(a,0,n);
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78 }
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79 return buf.toString();
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80 }
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81
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82 public static byte[] readAll(InputStream in)
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83 throws IOException
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84 {
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85 ByteArrayOutputStream out = new ByteArrayOutputStream();
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86 IoUtils.copyAll(in,out);
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87 return out.toByteArray();
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88 }
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90
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91 public static String removeString(LuanTable options,String key) throws LuanException {
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92 Object val = options.remove(key);
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93 if( val!=null && !(val instanceof String) )
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94 throw new LuanException( "parameter '"+key+"' must be a string but is a "+Luan.type(val) );
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95 return (String)val;
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96 }
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97
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98 public static String removeRequiredString(LuanTable options,String key) throws LuanException {
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99 String s = removeString(options,key);
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100 if( s==null )
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101 throw new LuanException( "parameter '"+key+"' is required" );
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102 return s;
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103 }
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104
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105 public static Number removeNumber(LuanTable options,String key) throws LuanException {
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106 Object val = options.remove(key);
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107 if( val!=null && !(val instanceof Number) )
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108 throw new LuanException( "parameter '"+key+"' must be a string but is a "+Luan.type(val) );
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109 return (Number)val;
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110 }
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111
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112 public static Integer removeInteger(LuanTable options,String key) throws LuanException {
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113 Object val = options.remove(key);
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114 if( val==null )
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115 return null;
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116 Integer i = Luan.asInteger(val);
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117 if( i==null ) {
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118 String type = val instanceof Number ? val.getClass().getSimpleName().toLowerCase() : Luan.type(val);
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119 throw new LuanException( "parameter '"+key+"' must be an integer but is a "+type );
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120 }
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121 return i;
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122 }
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123
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124 public static LuanTable removeTable(LuanTable options,String key) throws LuanException {
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125 Object val = options.remove(key);
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126 if( val!=null && !(val instanceof LuanTable) )
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127 throw new LuanException( "parameter '"+key+"' must be a table but is a "+Luan.type(val) );
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128 return (LuanTable)val;
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129 }
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130
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131 public static Boolean removeBoolean(LuanTable options,String key) throws LuanException {
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132 Object val = options.remove(key);
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133 if( val!=null && !(val instanceof Boolean) )
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134 throw new LuanException( "parameter '"+key+"' must be a string but is a "+Luan.type(val) );
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135 return (Boolean)val;
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136 }
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137
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138 public static LuanFunction removeFunction(LuanTable options,String key) throws LuanException {
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139 Object val = options.remove(key);
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140 if( val!=null && !(val instanceof LuanFunction) )
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141 throw new LuanException( "parameter '"+key+"' must be a function but is a "+Luan.type(val) );
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142 return (LuanFunction)val;
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143 }
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144
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145 public static LuanFunction removeRequiredFunction(LuanTable options,String key) throws LuanException {
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146 LuanFunction fn = removeFunction(options,key);
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147 if( fn==null )
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148 throw new LuanException( "parameter '"+key+"' is required" );
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149 return fn;
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150 }
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151
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152 public static void checkEmpty(LuanTable options) throws LuanException {
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153 if( !options.isEmpty() )
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154 throw new LuanException( "unrecognized options: "+options.asMap() );
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155 }
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156
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157 }