fixed illegal output of DateTimeAccuracy

histream-core/src/main/java/de/sekmi/histream/DateTimeAccuracy.java

@@ -150,8 +150,11 @@ public class DateTimeAccuracy implements Temporal, Comparable<DateTimeAccuracy>
 	 */
 	private void appendWithZeroPrefix(StringBuilder builder, TemporalField field, int digits){
 		int v = dateTime.get(field);
-		for(int i=digits; i>1 && v<(10^(i-1)); i--){
+		int pow = 1;
+		for( int i=1; i<digits; i++ )pow *= 10;
+		while( v < pow && pow > 1 ){
 			builder.append('0');
+			pow /= 10;
 		}
 		builder.append(v);
 	}

histream-core/src/test/java/de/sekmi/histream/impl/TestDateTimeAccuracy.java

@@ -41,11 +41,14 @@ public class TestDateTimeAccuracy {
 	}
 	@Test
 	public void testParseToString(){
-		final String str = "2001-03-04T05:06:07";
-		DateTimeAccuracy a = DateTimeAccuracy.parsePartialIso8601(str);
+		final String[] str = new String[]{"2001-03-04T10:16:07", "2001-03-04T10:16:00"};
+		DateTimeAccuracy a = DateTimeAccuracy.parsePartialIso8601(str[0]);
 		Assert.assertEquals(ChronoUnit.SECONDS, a.getAccuracy());
-		assertFieldValues(a, new int[]{2001,3,4,5,6,7});
-		Assert.assertEquals(str, a.toPartialIso8601());
+		assertFieldValues(a, new int[]{2001,3,4,10,16,7});
+		for( String s : str ){
+			a = DateTimeAccuracy.parsePartialIso8601(s);
+			Assert.assertEquals(s, a.toPartialIso8601());
+		}
 	}
 	
 	@Test

histream-core/src/test/java/de/sekmi/histream/impl/XPathEvaluatorTest.java

@@ -33,7 +33,7 @@ public class XPathEvaluatorTest {
 		Observation o = s.get();
 		//System.out.println("XXX:"+eval.evaluateToString("translate(fact/@start,'-:T','')", o));
 		//System.out.println(XPathEvaluator.toXMLString(o));
-		String[] trueExpressions = new String[]{"f:fact/@patient", "f:fact/@concept", "f:fact/@start", "number(translate(f:fact/@start,'-:T',''))=201409070104003"};
+		String[] trueExpressions = new String[]{"f:fact/@patient", "f:fact/@concept", "f:fact/@start", "number(translate(f:fact/@start,'-:T',''))=20140907104003"};
 		for( String expr : trueExpressions ){
 			Assert.assertEquals(expr, true, eval.test(expr, o));
 		}