WIP: support for conversion to numeric/valid Semver

src/main/java/se/simonsoft/cms/item/structure/CmsLabelVersion.java

@@ -128,6 +128,10 @@ public List<String> getVersionSegmentsSort() {
 		return getSortable(this.segments, false);
 	}
 
+	public List<Long> getVersionSegmentsNumeric() {
+		return getNumeric(this.segments);
+	}
+
 	/**
 	 * @return list of Pre-Release version identifiers (excl identifiers preceeding the last hyphen)
 	 */
@@ -182,6 +186,35 @@ private static String getSortable(String s) {
 		}
 	}
 
+	private static List<Long> getNumeric(List<String> segments) {
+		ArrayList<Long> l = new ArrayList<>(segments.size());
+		for (String s: segments) {
+			l.add(getNumeric(s));
+		}
+		return l;
+	}
+
+	private static Long getNumeric(String s) {
+		if (s.matches("^[0-9]+$")) {
+			return Long.valueOf(s);
+		} else if (s.matches("^[a-zA-Z]+$")) {
+			if (s.length() > 1) {
+				// TODO: Investigate if we can support 10 chars with 36 as multiplier.
+				throw new NumberFormatException("The version identifier must not exceed 1 character: " + s);
+			}
+
+			Long r = 0L;
+			for (int i = 0; i < s.length(); i++) {
+				int v = Character.getNumericValue(s.charAt(i));
+				// TODO: Decide multiplier (100 / 36 / 40 / 50 / 64).
+				r = 100*r + v;
+			}
+			return r;
+		} else {
+			throw new NumberFormatException("For version identifier: " + s);		
+		}
+	}
+
 	@Override
 	public int compareTo(CmsLabelVersion o) {
 		return this.getLabelSort().compareTo(o.getLabelSort());

src/test/java/se/simonsoft/cms/item/structure/CmsLabelVersionTest.java

@@ -77,6 +77,7 @@ public void testSimple1() {
 		assertEquals(1, l.getSegments().size());
 		assertEquals("A", l.getSegments().get(0));
 		assertEquals("@@@@@@@@@A", l.getSegmentsSort().get(0));
+		assertEquals(Long.valueOf(10), l.getVersionSegmentsNumeric().get(0));
 
 		assertEquals("A", l.toString());
 	}
@@ -130,6 +131,8 @@ public void testSimple2() {
 		assertEquals("2", l.getSegments().get(1));
 		assertEquals("@@@@@@@@@A", l.getSegmentsSort().get(0));
 		assertEquals("/////////2", l.getSegmentsSort().get(1));
+		assertEquals(Long.valueOf(10), l.getVersionSegmentsNumeric().get(0));
+		assertEquals(Long.valueOf(2), l.getVersionSegmentsNumeric().get(1));
 	}
 
 	@Test
@@ -144,6 +147,9 @@ public void testSimple3() {
 		assertEquals("@@@@@@@@@A", l.getSegmentsSort().get(0));
 		assertEquals("/////////2", l.getSegmentsSort().get(1));
 		assertEquals("//////1234", l.getSegmentsSort().get(2));
+		assertEquals(Long.valueOf(10), l.getVersionSegmentsNumeric().get(0));
+		assertEquals(Long.valueOf(2), l.getVersionSegmentsNumeric().get(1));
+		assertEquals(Long.valueOf(1234), l.getVersionSegmentsNumeric().get(2));
 	}
 
 	@Test
@@ -194,6 +200,12 @@ public void testLongSegment() { // Long segments simply not padded.
 		assertEquals("@@@@@@@@@A", l.getSegmentsSort().get(0));
 		assertEquals("abcdeXfghijk", l.getSegmentsSort().get(1));
 		assertEquals("//////1234", l.getSegmentsSort().get(2));
+
+		try {
+			l.getVersionSegmentsNumeric();
+			fail("should fail, string too long");
+		} catch (NumberFormatException e) {
+		}
 	}
 
 	@Test