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annotate src/luan/modules/Utils.java @ 1420:225808b90cee

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options handling
author Franklin Schmidt <fschmidt@gmail.com>
date Sat, 26 Oct 2019 22:21:09 -0600
parents 002152af497a
children 471ef3e6a84e
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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 luan.Luan;
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14 import luan.LuanException;
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15 import luan.LuanTable;
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16 import luan.LuanFunction;
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19 public final class Utils {
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20 private Utils() {} // never
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21
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22 static final int bufSize = 8192;
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23
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24 private static void checkNotNull(Object v,String expected,int pos) throws LuanException {
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25 if( v == null )
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26 throw new LuanException("bad argument #"+pos+" ("+expected+" expected, got nil)");
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27 }
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29 public static void checkNotNull(String s,int pos) throws LuanException {
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30 checkNotNull(s,"string",pos);
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31 }
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33 public static void checkNotNull(String s) throws LuanException {
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34 checkNotNull(s,1);
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35 }
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36
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37 public static void checkNotNull(byte[] b,int pos) throws LuanException {
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38 checkNotNull(b,"binary",pos);
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39 }
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41 public static void checkNotNull(byte[] b) throws LuanException {
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42 checkNotNull(b,1);
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43 }
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44
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45 public static void checkNotNull(LuanTable t,int pos) throws LuanException {
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46 checkNotNull(t,"table",pos);
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47 }
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49 public static void checkNotNull(LuanTable t) throws LuanException {
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50 checkNotNull(t,1);
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51 }
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52
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53 public static void checkNotNull(Number n,int pos) throws LuanException {
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54 checkNotNull(n,"number",pos);
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55 }
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56
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57 public static void checkNotNull(Number n) throws LuanException {
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58 checkNotNull(n,1);
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59 }
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60
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61 public static void checkNotNull(LuanFunction fn,int pos) throws LuanException {
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62 checkNotNull(fn,"function",pos);
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63 }
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64
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65 public static void checkNotNull(LuanFunction fn) throws LuanException {
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66 checkNotNull(fn,1);
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67 }
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68
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69 public static String readAll(Reader in)
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70 throws IOException
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71 {
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72 char[] a = new char[bufSize];
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73 StringBuilder buf = new StringBuilder();
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74 int n;
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75 while( (n=in.read(a)) != -1 ) {
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76 buf.append(a,0,n);
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77 }
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78 return buf.toString();
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79 }
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81 public static void copyAll(InputStream in,OutputStream out)
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82 throws IOException
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83 {
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84 byte[] a = new byte[bufSize];
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85 int n;
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86 while( (n=in.read(a)) != -1 ) {
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87 out.write(a,0,n);
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88 }
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89 }
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91 public static byte[] readAll(InputStream in)
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92 throws IOException
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93 {
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94 ByteArrayOutputStream out = new ByteArrayOutputStream();
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95 copyAll(in,out);
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96 return out.toByteArray();
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97 }
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99
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100 public static String removeString(LuanTable options,String key) throws LuanException {
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101 Object val = options.remove(key);
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102 if( val!=null && !(val instanceof String) )
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103 throw new LuanException( "parameter '"+key+"' must be a string but is a "+Luan.type(val) );
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104 return (String)val;
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105 }
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106
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107 public static String removeRequiredString(LuanTable options,String key) throws LuanException {
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108 String s = removeString(options,key);
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109 if( s==null )
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110 throw new LuanException( "parameter '"+key+"' is required" );
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111 return s;
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112 }
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113
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114 public static Number removeNumber(LuanTable options,String key) throws LuanException {
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115 Object val = options.remove(key);
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116 if( val!=null && !(val instanceof Number) )
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117 throw new LuanException( "parameter '"+key+"' must be a string but is a "+Luan.type(val) );
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118 return (Number)val;
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119 }
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120
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121 public static Integer removeInteger(LuanTable options,String key) throws LuanException {
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122 Object val = options.remove(key);
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123 if( val==null )
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124 return null;
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125 Integer i = Luan.asInteger(val);
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126 if( i==null ) {
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127 String type = val instanceof Number ? val.getClass().getSimpleName().toLowerCase() : Luan.type(val);
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128 throw new LuanException( "parameter '"+key+"' must be an integer but is a "+type );
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129 }
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130 return i;
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131 }
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132
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133 public static LuanTable removeTable(LuanTable options,String key) throws LuanException {
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134 Object val = options.remove(key);
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135 if( val!=null && !(val instanceof LuanTable) )
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136 throw new LuanException( "parameter '"+key+"' must be a table but is a "+Luan.type(val) );
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137 return (LuanTable)val;
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138 }
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139
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140 public static Boolean removeBoolean(LuanTable options,String key) throws LuanException {
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141 Object val = options.remove(key);
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142 if( val!=null && !(val instanceof Boolean) )
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143 throw new LuanException( "parameter '"+key+"' must be a string but is a "+Luan.type(val) );
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144 return (Boolean)val;
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145 }
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146
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147 public static LuanFunction removeFunction(LuanTable options,String key) throws LuanException {
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148 Object val = options.remove(key);
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149 if( val!=null && !(val instanceof LuanFunction) )
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150 throw new LuanException( "parameter '"+key+"' must be a function but is a "+Luan.type(val) );
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151 return (LuanFunction)val;
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152 }
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153
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154 public static LuanFunction removeRequiredFunction(LuanTable options,String key) throws LuanException {
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155 LuanFunction fn = removeFunction(options,key);
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156 if( fn==null )
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157 throw new LuanException( "parameter '"+key+"' is required" );
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158 return fn;
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159 }
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160
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161 public static void checkEmpty(LuanTable options) throws LuanException {
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162 if( !options.isEmpty() )
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163 throw new LuanException( "unrecognized options: "+options.asMap() );
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164 }
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165
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166 }