java/com/android/dialer/util/UriUtils.java

/*
 * Copyright (C) 2011 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.util;

import android.net.Uri;
import android.provider.ContactsContract;
import java.util.List;

/** Utility methods for dealing with URIs. */
public class UriUtils {

  private static final String LOOKUP_URI_ENCODED = "encoded";

  /** Static helper, not instantiable. */
  private UriUtils() {}

  /** Checks whether two URI are equal, taking care of the case where either is null. */
  public static boolean areEqual(Uri uri1, Uri uri2) {
    if (uri1 == null && uri2 == null) {
      return true;
    }
    if (uri1 == null || uri2 == null) {
      return false;
    }
    return uri1.equals(uri2);
  }

  /** Parses a string into a URI and returns null if the given string is null. */
  public static Uri parseUriOrNull(String uriString) {
    if (uriString == null) {
      return null;
    }
    return Uri.parse(uriString);
  }

  /** Converts a URI into a string, returns null if the given URI is null. */
  public static String uriToString(Uri uri) {
    return uri == null ? null : uri.toString();
  }

  public static boolean isEncodedContactUri(Uri uri) {
    if (uri == null) {
      return false;
    }
    final String lastPathSegment = uri.getLastPathSegment();
    if (lastPathSegment == null) {
      return false;
    }
    return lastPathSegment.equals(LOOKUP_URI_ENCODED);
  }

  /**
   * @return {@code uri} as-is if the authority is of contacts provider. Otherwise or {@code uri} is
   *     null, return null otherwise
   */
  public static Uri nullForNonContactsUri(Uri uri) {
    if (uri == null) {
      return null;
    }
    return ContactsContract.AUTHORITY.equals(uri.getAuthority()) ? uri : null;
  }

  /** Parses the given URI to determine the original lookup key of the contact. */
  public static String getLookupKeyFromUri(Uri lookupUri) {
    // Would be nice to be able to persist the lookup key somehow to avoid having to parse
    // the uri entirely just to retrieve the lookup key, but every uri is already parsed
    // once anyway to check if it is an encoded JSON uri, so this has negligible effect
    // on performance.
    if (lookupUri != null && !UriUtils.isEncodedContactUri(lookupUri)) {
      final List<String> segments = lookupUri.getPathSegments();
      // This returns the third path segment of the uri, where the lookup key is located.
      // See {@link android.provider.ContactsContract.Contacts#CONTENT_LOOKUP_URI}.
      return (segments.size() < 3) ? null : Uri.encode(segments.get(2));
    } else {
      return null;
    }
  }
}