DATACMNS-692 - Fixed web parameter range handling for Pageables.

In case the PageableHandlerMethodArgumentResolver was configured to use one-indexed parameters, it wasn't defaulting the lower bounds for the page number. This caused indexes out of the allowed bound submitted causing an invalid index handed tor PageRequest. We now apply better range shifting before the bounds are applied.

src/main/java/org/springframework/data/web/PageableHandlerMethodArgumentResolver.java

@@ -235,9 +235,9 @@ public class PageableHandlerMethodArgumentResolver implements HandlerMethodArgum
 			return null;
 		}
 
-		int page = StringUtils.hasText(pageString) ? parseAndApplyBoundaries(pageString, 0, Integer.MAX_VALUE)
-				- (oneIndexedParameters ? 1 : 0) : defaultOrFallback.getPageNumber();
-		int pageSize = StringUtils.hasText(pageSizeString) ? parseAndApplyBoundaries(pageSizeString, 0, maxPageSize)
+		int page = StringUtils.hasText(pageString) ? parseAndApplyBoundaries(pageString, Integer.MAX_VALUE)
+				: defaultOrFallback.getPageNumber();
+		int pageSize = StringUtils.hasText(pageSizeString) ? parseAndApplyBoundaries(pageSizeString, maxPageSize)
 				: defaultOrFallback.getPageSize();
 
 		// Limit lower bound
@@ -306,17 +306,16 @@ public class PageableHandlerMethodArgumentResolver implements HandlerMethodArgum
 	 * boundary if the {@link String} cannot be parsed.
 	 * 
 	 * @param parameter
-	 * @param lower
 	 * @param upper
 	 * @return
 	 */
-	private static int parseAndApplyBoundaries(String parameter, int lower, int upper) {
+	private int parseAndApplyBoundaries(String parameter, int upper) {
 
 		try {
-			int parsed = Integer.parseInt(parameter);
-			return parsed < lower ? lower : parsed > upper ? upper : parsed;
+			int parsed = Integer.parseInt(parameter) - (oneIndexedParameters ? 1 : 0);
+			return parsed < 0 ? 0 : parsed > upper ? upper : parsed;
 		} catch (NumberFormatException e) {
-			return lower;
+			return 0;
 		}
 	}
 }

src/test/java/org/springframework/data/web/PageableHandlerMethodArgumentResolverUnitTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 the original author or authors.
+ * Copyright 2013-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -236,6 +236,23 @@ public class PageableHandlerMethodArgumentResolverUnitTests extends PageableDefa
 		assertThat(result.getSort(), is(nullValue()));
 	}
 
+	/**
+	 * @see DATACMNS-692
+	 */
+	@Test
+	public void oneIndexedParametersDefaultsIndexOutOfRange() {
+
+		PageableHandlerMethodArgumentResolver resolver = getResolver();
+		resolver.setOneIndexedParameters(true);
+
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.addParameter("page", "0");
+
+		Pageable result = resolver.resolveArgument(supportedMethodParameter, null, new ServletWebRequest(request), null);
+
+		assertThat(result.getPageNumber(), is(0));
+	}
+
 	@Override
 	protected PageableHandlerMethodArgumentResolver getResolver() {
 		PageableHandlerMethodArgumentResolver resolver = new PageableHandlerMethodArgumentResolver();