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+/*
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *    * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_
+#define CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_
+#pragma once
+
+#include "build/build_config.h"  // Needed for OS_ANDROID
+
+#if defined(OS_ANDROID)
+
+#include "base/string_util.h"
+#include "googleurl/src/gurl.h"
+#include "public/WebRange.h"
+
+namespace WebKit {
+class WebHitTestInfo;
+}
+
+// Base class for text-based content detectors.
+class ContentDetector {
+ public:
+
+  // Holds the content detection results.
+  struct Result {
+    bool valid; // Flag indicating if the result is valid.
+    WebKit::WebRange range; // Range describing the content boundaries.
+    std::string text; // Processed text of the content.
+    GURL intent_url; // URL of the intent that should process this content.
+
+    Result() : valid(false) {}
+
+    Result(const WebKit::WebRange& range,
+           const std::string& text,
+           const GURL& intent_url)
+        : valid(true),
+          range(range),
+          text(text),
+          intent_url(intent_url) {}
+  };
+
+  virtual ~ContentDetector() {}
+
+  // Returns a WebKit range delimiting the contents found around the tapped
+  // position. If no content is found a null range will be returned.
+  Result FindTappedContent(const WebKit::WebHitTestInfo& hit_test);
+
+ protected:
+  // Parses the input string defined by the begin/end iterators returning true
+  // if the desired content is found. The start and end positions relative to
+  // the input iterators are returned in start_pos and end_pos.
+  // The end position is assumed to be non-inclusive.
+  virtual bool FindContent(const string16::const_iterator& begin,
+                           const string16::const_iterator& end,
+                           size_t* start_pos,
+                           size_t* end_pos) = 0;
+
+  // Extracts and processes the text of the detected content.
+  virtual std::string GetContentText(const WebKit::WebRange& range) = 0;
+
+  // Returns the intent URL that should process the content, if any.
+  virtual GURL GetIntentURL(const std::string& content_text) = 0;
+
+  // Returns the maximum length of text to be extracted around the tapped
+  // position in order to search for content.
+  virtual size_t GetMaximumContentLength() = 0;
+
+  ContentDetector() {}
+  WebKit::WebRange FindContentRange(const WebKit::WebHitTestInfo& hit_test);
+
+  DISALLOW_COPY_AND_ASSIGN(ContentDetector);
+};
+
+#endif  // defined(OS_ANDROID)
+
+#endif  // CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_