implement validations of pagination URLs

javatests/org/chromium/distiller/QueryParamPagePatternTest.java

Index: javatests/org/chromium/distiller/QueryParamPagePatternTest.java
diff --git a/javatests/org/chromium/distiller/QueryParamPagePatternTest.java b/javatests/org/chromium/distiller/QueryParamPagePatternTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..fe552bc4d69a60e663e341ea8f0430d3c4e55b64
--- /dev/null
+++ b/javatests/org/chromium/distiller/QueryParamPagePatternTest.java
@@ -0,0 +1,76 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.distiller;
+
+public class QueryParamPagePatternTest extends DomDistillerJsTestCase {
+    private static final String PAGE_PARAM_VALUE = "8";
+
+    public void testIsPagingUrl() {
+        assertTrue(isPagingUrl("http://www.foo.com/a/b?queryA=v1&queryB=4&queryC=v3",
+                               "http://www.foo.com/a/b?queryA=v1&queryB=[*!]&queryC=v3"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b?queryA=v1&queryC=v3",
+                               "http://www.foo.com/a/b?queryA=v1&queryB=[*!]&queryC=v3"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b?queryB=2&queryC=v3",
+                               "http://www.foo.com/a/b?queryB=[*!]&queryC=v3"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b?queryC=v3",
+                               "http://www.foo.com/a/b?queryB=[*!]&queryC=v3"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b", "http://www.foo.com/a/b?page=[*!]"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b?page=3",
+                               "http://www.foo.com/a/b?page=[*!]"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b/", "http://www.foo.com/a/b?page=[*!]"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b.htm", "http://www.foo.com/a/b?page=[*!]"));
+        assertTrue(isPagingUrl("http://www.foo.com/a/b.html", "http://www.foo.com/a/b?page=[*!]"));
+        assertFalse(isPagingUrl("http://www.foo.com/a/b?queryA=v1&queryC=v3",
+                                "http://www.foo.com/a/b?queryB=[*!]&queryC=v3"));
+        assertFalse(isPagingUrl("http://www.foo.com/a/b?queryB=bar&queryC=v3",
+                                "http://www.foo.com/a/b?queryB=[*!]&queryC=v3"));
+        assertFalse(isPagingUrl("http://www.foo.com/a/b?queryC=v3&queryB=3",
+                                "http://www.foo.com/a/b?queryB=[*!]&queryC=v3"));
+        assertFalse(isPagingUrl("http://www.foo.com/a/b?queryA=v1",
+                                "http://www.foo.com/a/b?queryA=v1&queryB=[*!]&queryC=v3"));
+    }
+
+    public void testIsPagePatternValid() {
+        assertTrue(isPagePatternValid("http://www.google.com/forum-12",
+                "http://www.google.com/forum-12?page=[*!]"));
+        assertTrue(isPagePatternValid("http://www.google.com/forum-12?sid=12345",
+                "http://www.google.com/forum-12?page=[*!]&sort=d"));
+        assertFalse(isPagePatternValid("http://www.google.com/a/forum-12?sid=12345",
+                "http://www.google.com/b/forum-12?page=[*!]&sort=d"));
+        assertFalse(isPagePatternValid("http://www.google.com/forum-11?sid=12345",
+                "http://www.google.com/forum-12?page=[*!]&sort=d"));
+    }
+
+    private static boolean isPagingUrl(String urlStr, String patternStr) {
+        PageParameterDetector.PagePattern pattern = createPagePattern(patternStr);
+        assertTrue(pattern != null);
+        return pattern.isPagingUrl(urlStr);
+    }
+
+    private static boolean isPagePatternValid(String urlStr, String patternStr) {
+        ParsedUrl url = ParsedUrl.create(urlStr);
+        assertTrue(url != null);
+        PageParameterDetector.PagePattern pattern = createPagePattern(patternStr);
+        assertTrue(pattern != null);
+        return pattern.isValidFor(url);
+    }
+
+    private static PageParameterDetector.PagePattern createPagePattern(String patternStr) {
+        ParsedUrl url = ParsedUrl.create(patternStr);
+        String[][] queryParams = url.getQueryParams();
+        assertTrue(queryParams.length > 0);
+        for (String[] nameValue : queryParams) {
+            final String queryName = nameValue[0];
+            final String queryValue = nameValue[1];
+            if (queryValue.contains(PageParameterDetector.PAGE_PARAM_PLACEHOLDER)) {
+                return QueryParamPagePattern.create(ParsedUrl.create(
+                        url.replaceQueryValue(queryName, queryValue, PAGE_PARAM_VALUE)),
+                        queryName, PAGE_PARAM_VALUE);
+            }
+        }
+        return null;
+    }
+
+}