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annotate src/luan/lib/Utils.java @ 143:fcb81fa2df0d

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handle urls and java resources as files git-svn-id: https://luan-java.googlecode.com/svn/trunk@144 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 13 Jun 2014 19:04:05 +0000
parents 0594c132888b
children d310ebf4d6e7
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1 package luan.lib;
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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.net.URL;
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10 import java.net.MalformedURLException;
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11 import luan.LuanState;
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12 import luan.LuanException;
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15 public final class Utils {
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16 private Utils() {} // never
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18 static final int bufSize = 8192;
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20 public static void checkNotNull(LuanState luan,Object v,String expected) throws LuanException {
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21 if( v == null )
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22 throw luan.exception("bad argument #1 ("+expected+" expected, got nil)");
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23 }
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25 public static String readAll(Reader in)
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26 throws IOException
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27 {
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28 char[] a = new char[bufSize];
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29 StringBuilder buf = new StringBuilder();
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30 int n;
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31 while( (n=in.read(a)) != -1 ) {
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32 buf.append(a,0,n);
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33 }
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34 return buf.toString();
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35 }
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37 public static void copyAll(InputStream in,OutputStream out)
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38 throws IOException
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39 {
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40 byte[] a = new byte[bufSize];
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41 int n;
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42 while( (n=in.read(a)) != -1 ) {
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43 out.write(a,0,n);
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44 }
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45 }
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47 public static byte[] readAll(InputStream in)
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48 throws IOException
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49 {
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50 ByteArrayOutputStream out = new ByteArrayOutputStream();
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51 copyAll(in,out);
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52 return out.toByteArray();
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53 }
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55 public static boolean isFile(String path) {
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56 return new File(path).exists();
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57 }
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59 public static String toUrl(String path) {
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60 if( path.indexOf(':') == -1 )
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61 return null;
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62 if( path.startsWith("java:") ) {
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63 path = path.substring(5);
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64 URL url = ClassLoader.getSystemResource(path);
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65 return url==null ? null : url.toString();
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66 }
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67 try {
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68 new URL(path);
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69 return path;
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70 } catch(MalformedURLException e) {}
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71 return null;
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72 }
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74 public static boolean exists(String path) {
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75 return isFile(path) || toUrl(path)!=null;
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76 }
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77 }