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/*
* Copyright (C) 2014 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 android.hardware.camera2.utils;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
/**
* Various assortment of array utilities.
*/
public class ArrayUtils {
private static final String TAG = "ArrayUtils";
private static final boolean DEBUG = false;
/** Return the index of {@code needle} in the {@code array}, or else {@code -1} */
public static <T> int getArrayIndex(T[] array, T needle) {
if (array == null) {
return -1;
}
int index = 0;
for (T elem : array) {
if (Objects.equals(elem, needle)) {
return index;
}
index++;
}
return -1;
}
/** Return the index of {@code needle} in the {@code array}, or else {@code -1} */
public static int getArrayIndex(int[] array, int needle) {
if (array == null) {
return -1;
}
for (int i = 0; i < array.length; ++i) {
if (array[i] == needle) {
return i;
}
}
return -1;
}
/**
* Create an {@code int[]} from the {@code List<>} by using {@code convertFrom} and
* {@code convertTo} as a one-to-one map (via the index).
*
* <p>Strings not appearing in {@code convertFrom} are ignored (with a logged warning);
* strings appearing in {@code convertFrom} but not {@code convertTo} are silently
* dropped.</p>
*
* @param list Source list of strings
* @param convertFrom Conversion list of strings
* @param convertTo Conversion list of ints
* @return An array of ints where the values correspond to the ones in {@code convertTo}
* or {@code null} if {@code list} was {@code null}
*/
public static int[] convertStringListToIntArray(
List<String> list, String[] convertFrom, int[] convertTo) {
if (list == null) {
return null;
}
List<Integer> convertedList = convertStringListToIntList(list, convertFrom, convertTo);
int[] returnArray = new int[convertedList.size()];
for (int i = 0; i < returnArray.length; ++i) {
returnArray[i] = convertedList.get(i);
}
return returnArray;
}
/**
* Create an {@code List<Integer>} from the {@code List<>} by using {@code convertFrom} and
* {@code convertTo} as a one-to-one map (via the index).
*
* <p>Strings not appearing in {@code convertFrom} are ignored (with a logged warning);
* strings appearing in {@code convertFrom} but not {@code convertTo} are silently
* dropped.</p>
*
* @param list Source list of strings
* @param convertFrom Conversion list of strings
* @param convertTo Conversion list of ints
* @return A list of ints where the values correspond to the ones in {@code convertTo}
* or {@code null} if {@code list} was {@code null}
*/
public static List<Integer> convertStringListToIntList(
List<String> list, String[] convertFrom, int[] convertTo) {
if (list == null) {
return null;
}
List<Integer> convertedList = new ArrayList<>(list.size());
for (String str : list) {
int strIndex = getArrayIndex(convertFrom, str);
// Guard against unexpected values
if (strIndex < 0) {
if (DEBUG) Log.v(TAG, "Ignoring invalid value " + str);
continue;
}
// Ignore values we can't map into (intentional)
if (strIndex < convertTo.length) {
convertedList.add(convertTo[strIndex]);
}
}
return convertedList;
}
/**
* Convert the list of integers in {@code list} to an {@code int} array.
*
* <p>Every element in {@code list} must be non-{@code null}.</p>
*
* @param list a list of non-{@code null} integers
*
* @return a new int array containing all the elements from {@code list}
*
* @throws NullPointerException if any of the elements in {@code list} were {@code null}
*/
public static int[] toIntArray(List<Integer> list) {
if (list == null) {
return null;
}
int[] arr = new int[list.size()];
int i = 0;
for (int elem : list) {
arr[i] = elem;
i++;
}
return arr;
}
/**
* Returns true if the given {@code array} contains the given element.
*
* @param array {@code array} to check for {@code elem}
* @param elem {@code elem} to test for
* @return {@code true} if the given element is contained
*/
public static boolean contains(int[] array, int elem) {
return getArrayIndex(array, elem) != -1;
}
/**
* Returns true if the given {@code array} contains the given element.
*
* @param array {@code array} to check for {@code elem}
* @param elem {@code elem} to test for
* @return {@code true} if the given element is contained
*/
public static <T> boolean contains(T[] array, T elem) {
return getArrayIndex(array, elem) != -1;
}
private ArrayUtils() {
throw new AssertionError();
}
}
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