1 files changed, 141 insertions, 0 deletions
diff --git a/java/com/android/dialer/searchfragment/common/QueryFilteringUtil.java b/java/com/android/dialer/searchfragment/common/QueryFilteringUtil.java
new file mode 100644
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+++ b/java/com/android/dialer/searchfragment/common/QueryFilteringUtil.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.dialer.searchfragment.common;
+
+import android.support.annotation.NonNull;
+import android.telephony.PhoneNumberUtils;
+import android.text.TextUtils;
+import java.util.regex.Pattern;
+
+/** Utility class for filtering, comparing and handling strings and queries. */
+public class QueryFilteringUtil {
+
+  /** Matches strings with "-", "(", ")", 2-9 of at least length one. */
+  static final Pattern T9_PATTERN = Pattern.compile("[\\-()2-9]+");
+
+  /**
+   * @return true if the query is of T9 format and the name's T9 representation belongs to the
+   *     query; false otherwise.
+   */
+  public static boolean nameMatchesT9Query(String query, String name) {
+    if (!T9_PATTERN.matcher(query).matches()) {
+      return false;
+    }
+
+    // Substring
+    if (indexOfQueryNonDigitsIgnored(query, getT9Representation(name)) != -1) {
+      return true;
+    }
+
+    // Check matches initials
+    // TODO investigate faster implementation
+    query = digitsOnly(query);
+    int queryIndex = 0;
+
+    String[] names = name.toLowerCase().split("\\s");
+    for (int i = 0; i < names.length && queryIndex < query.length(); i++) {
+      if (TextUtils.isEmpty(names[i])) {
+        continue;
+      }
+
+      if (getDigit(names[i].charAt(0)) == query.charAt(queryIndex)) {
+        queryIndex++;
+      }
+    }
+
+    return queryIndex == query.length();
+  }
+
+  /** @return true if the number belongs to the query. */
+  public static boolean numberMatchesNumberQuery(String query, String number) {
+    return PhoneNumberUtils.isGlobalPhoneNumber(query)
+        && indexOfQueryNonDigitsIgnored(query, number) != -1;
+  }
+
+  /**
+   * Checks if query is contained in number while ignoring all characters in both that are not
+   * digits (i.e. {@link Character#isDigit(char)} returns false).
+   *
+   * @return index where query is found with all non-digits removed, -1 if it's not found.
+   */
+  static int indexOfQueryNonDigitsIgnored(@NonNull String query, @NonNull String number) {
+    return digitsOnly(number).indexOf(digitsOnly(query));
+  }
+
+  // Returns string with letters replaced with their T9 representation.
+  static String getT9Representation(String s) {
+    StringBuilder builder = new StringBuilder(s.length());
+    for (char c : s.toLowerCase().toCharArray()) {
+      builder.append(getDigit(c));
+    }
+    return builder.toString();
+  }
+
+  /** @return String s with only digits recognized by Character#isDigit() remaining */
+  public static String digitsOnly(String s) {
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < s.length(); i++) {
+      char c = s.charAt(i);
+      if (Character.isDigit(c)) {
+        sb.append(c);
+      }
+    }
+    return sb.toString();
+  }
+
+  // Returns the T9 representation of a lower case character, otherwise returns the character.
+  static char getDigit(char c) {
+    switch (c) {
+      case 'a':
+      case 'b':
+      case 'c':
+        return '2';
+      case 'd':
+      case 'e':
+      case 'f':
+        return '3';
+      case 'g':
+      case 'h':
+      case 'i':
+        return '4';
+      case 'j':
+      case 'k':
+      case 'l':
+        return '5';
+      case 'm':
+      case 'n':
+      case 'o':
+        return '6';
+      case 'p':
+      case 'q':
+      case 'r':
+      case 's':
+        return '7';
+      case 't':
+      case 'u':
+      case 'v':
+        return '8';
+      case 'w':
+      case 'x':
+      case 'y':
+      case 'z':
+        return '9';
+      default:
+        return c;
+    }
+  }
+}