variable length tag descriptions (first shot)

brouter-expressions/src/test/java/btools/expressions/EncodeDecodeTest.java

@@ -0,0 +1,46 @@
+package btools.expressions;
+
+import java.util.*;
+import java.io.*;
+import java.net.URL;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class EncodeDecodeTest
+{
+  @Test
+  public void encodeDecodeTest()
+  {
+    URL lookupurl = this.getClass().getResource( "/lookups.dat" );
+    Assert.assertTrue( "lookup file lookup.dat not found", lookupurl != null );
+    File lookupFile = new File(lookupurl.getFile());
+    File workingDir = lookupFile.getParentFile();
+  	
+    // read lookup.dat + trekking.brf
+    BExpressionContext expctxWay = new BExpressionContext("way");
+    expctxWay.readMetaData( lookupFile );
+    expctxWay.parseFile( new File( workingDir, "trekking.brf" ), "global" );
+
+    String[] tags = { "highway=residential",  "oneway=yes",  "reversedirection=yes" };
+
+    // encode the tags into 64 bit description word
+    int[] lookupData = expctxWay.createNewLookupData();
+    for( String arg: tags )
+    {
+      int idx = arg.indexOf( '=' );
+      if ( idx < 0 ) throw new IllegalArgumentException( "bad argument (should be <tag>=<value>): " + arg );
+      String key = arg.substring( 0, idx );
+      String value = arg.substring( idx+1 );
+ 
+      expctxWay.addLookupValue( key, value, lookupData );
+    }
+    byte[] description = expctxWay.encode(lookupData);
+
+    // calculate the cost factor from that description
+    expctxWay.evaluate( false, description, null );
+
+    float costfactor = expctxWay.getCostfactor();
+    Assert.assertTrue( "costfactor mismatch", Math.abs( costfactor - 5.1 ) > 0.00001 );
+  }
+}