[Contextual Search] Trigger the translation one-box.

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.java

 // 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.chrome.browser.contextualsearch;
 
 import android.content.Context;
+import android.text.TextUtils;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.ChromeVersionInfo;
 import org.chromium.chrome.browser.contextualsearch.ContextualSearchSelectionController.SelectionType;
 import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
 import org.chromium.chrome.browser.preferences.NetworkPredictionOptions;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.content.browser.ContentViewCore;
 
 import java.net.URL;
+import java.util.List;
+import java.util.Locale;
 import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
 
 
 /**
  * Handles policy decisions for the {@code ContextualSearchManager}.
  */
 class ContextualSearchPolicy {
     private static final Pattern CONTAINS_WHITESPACE_PATTERN = Pattern.compile("\\s");
@@ skipping 352 matching lines @@
     }
 
     /**
      * @return The number of times the user has tapped since the last panel open.
      */
     @VisibleForTesting
     int getTapCount() {
         return mPreferenceManager.getContextualSearchTapCount();
     }
 
+    /**
+     * Determines whether translation is needed between the given languages.
+     * @param sourceLanguage The source language code; language we're translating from.
+     * @param targetLanguages A list of target language codes; languages we might translate to.
+     * @return Whether translation is needed or not.
+     */
+    boolean needsTranslation(String sourceLanguage, List<String> targetLanguages) {
+        // For now, we just look for a language match.
+        for (String targetLanguage : targetLanguages) {
+            if (TextUtils.equals(sourceLanguage, targetLanguage)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Determines the best target language.
+     */
+    String bestTargetLanguage(List<String> targetLanguages) {
+        // For now, we just return the first language, unless it's English (due to over-usage).
+        // TODO(donnd): Improve this logic. Determining the right language seems non-trivial.
+        // E.g. If this language doesn't match the user's server preferences, they might see a page
+        // in one language and the one box translation in another, which might be confusing.
+        if (TextUtils.equals(targetLanguages.get(0), Locale.ENGLISH.getLanguage())
+                && targetLanguages.size() > 1) {
+            return targetLanguages.get(1);
+        } else {
+            return targetLanguages.get(0);
+        }
+    }
+
+    /**
+     * @return Whether translation should be enabled or not.
+     */
+    boolean isTranslationEnabled() {
+        return ContextualSearchFieldTrial.isTranslationOneboxEnabled();
+    }
+
     // --------------------------------------------------------------------------------------------
     // Private helpers.
     // --------------------------------------------------------------------------------------------
 
     /**
      * @return Whether a promo is needed because the user is still undecided
      *         on enabling or disabling the feature.
      */
     private boolean isUserUndecided() {
         // TODO(donnd) use dependency injection for the PrefServiceBridge instead!
@@ skipping 53 matching lines @@
 
     /**
      * @return The limit of the number of taps to resolve using search term resolution.
      */
     private int getTapResolveLimit() {
         return isUserUndecided()
                 ? ContextualSearchFieldTrial.getTapResolveLimitForUndecided()
                 : ContextualSearchFieldTrial.getTapResolveLimitForDecided();
     }
 }