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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2010 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.gallery3d.common;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.database.Cursor;
import android.os.Build;
import android.os.ParcelFileDescriptor;
import android.text.TextUtils;
import android.util.Log;
import java.io.Closeable;
import java.io.IOException;
import java.io.InterruptedIOException;
public class Utils {
private static final String TAG = "Utils";
private static final String DEBUG_TAG = "GalleryDebug";
private static final long POLY64REV = 0x95AC9329AC4BC9B5L;
private static final long INITIALCRC = 0xFFFFFFFFFFFFFFFFL;
private static long[] sCrcTable = new long[256];
private static final boolean IS_DEBUG_BUILD =
Build.TYPE.equals("eng") || Build.TYPE.equals("userdebug");
private static final String MASK_STRING = "********************************";
// Throws AssertionError if the input is false.
public static void assertTrue(boolean cond) {
if (!cond) {
throw new AssertionError();
}
}
// Throws AssertionError with the message. We had a method having the form
// assertTrue(boolean cond, String message, Object ... args);
// However a call to that method will cause memory allocation even if the
// condition is false (due to autoboxing generated by "Object ... args"),
// so we don't use that anymore.
public static void fail(String message, Object ... args) {
throw new AssertionError(
args.length == 0 ? message : String.format(message, args));
}
// Throws NullPointerException if the input is null.
public static T checkNotNull(T object) {
if (object == null) throw new NullPointerException();
return object;
}
// Returns true if two input Object are both null or equal
// to each other.
public static boolean equals(Object a, Object b) {
return (a == b) || (a == null ? false : a.equals(b));
}
// Returns the next power of two.
// Returns the input if it is already power of 2.
// Throws IllegalArgumentException if the input is <= 0 or
// the answer overflows.
public static int nextPowerOf2(int n) {
if (n <= 0 || n > (1 << 30)) throw new IllegalArgumentException("n is invalid: " + n);
n -= 1;
n |= n >> 16;
n |= n >> 8;
n |= n >> 4;
n |= n >> 2;
n |= n >> 1;
return n + 1;
}
// Returns the previous power of two.
// Returns the input if it is already power of 2.
// Throws IllegalArgumentException if the input is <= 0
public static int prevPowerOf2(int n) {
if (n <= 0) throw new IllegalArgumentException();
return Integer.highestOneBit(n);
}
// Returns the input value x clamped to the range [min, max].
public static int clamp(int x, int min, int max) {
if (x > max) return max;
if (x < min) return min;
return x;
}
// Returns the input value x clamped to the range [min, max].
public static float clamp(float x, float min, float max) {
if (x > max) return max;
if (x < min) return min;
return x;
}
// Returns the input value x clamped to the range [min, max].
public static long clamp(long x, long min, long max) {
if (x > max) return max;
if (x < min) return min;
return x;
}
public static boolean isOpaque(int color) {
return color >>> 24 == 0xFF;
}
public static void swap(int[] array, int i, int j) {
int temp = array[i];
array[i] = array[j];
array[j] = temp;
}
/**
* A function thats returns a 64-bit crc for string
*
* @param in input string
* @return a 64-bit crc value
*/
public static final long crc64Long(String in) {
if (in == null || in.length() == 0) {
return 0;
}
return crc64Long(getBytes(in));
}
static {
// http://bioinf.cs.ucl.ac.uk/downloads/crc64/crc64.c
long part;
for (int i = 0; i < 256; i++) {
part = i;
for (int j = 0; j < 8; j++) {
long x = ((int) part & 1) != 0 ? POLY64REV : 0;
part = (part >> 1) ^ x;
}
sCrcTable[i] = part;
}
}
public static final long crc64Long(byte[] buffer) {
long crc = INITIALCRC;
for (int k = 0, n = buffer.length; k < n; ++k) {
crc = sCrcTable[(((int) crc) ^ buffer[k]) & 0xff] ^ (crc >> 8);
}
return crc;
}
public static byte[] getBytes(String in) {
byte[] result = new byte[in.length() * 2];
int output = 0;
for (char ch : in.toCharArray()) {
result[output++] = (byte) (ch & 0xFF);
result[output++] = (byte) (ch >> 8);
}
return result;
}
public static void closeSilently(Closeable c) {
if (c == null) return;
try {
c.close();
} catch (IOException t) {
Log.w(TAG, "close fail ", t);
}
}
public static int compare(long a, long b) {
return a < b ? -1 : a == b ? 0 : 1;
}
public static int ceilLog2(float value) {
int i;
for (i = 0; i < 31; i++) {
if ((1 << i) >= value) break;
}
return i;
}
public static int floorLog2(float value) {
int i;
for (i = 0; i < 31; i++) {
if ((1 << i) > value) break;
}
return i - 1;
}
public static void closeSilently(ParcelFileDescriptor fd) {
try {
if (fd != null) fd.close();
} catch (Throwable t) {
Log.w(TAG, "fail to close", t);
}
}
public static void closeSilently(Cursor cursor) {
try {
if (cursor != null) cursor.close();
} catch (Throwable t) {
Log.w(TAG, "fail to close", t);
}
}
public static float interpolateAngle(
float source, float target, float progress) {
// interpolate the angle from source to target
// We make the difference in the range of [-179, 180], this is the
// shortest path to change source to target.
float diff = target - source;
if (diff < 0) diff += 360f;
if (diff > 180) diff -= 360f;
float result = source + diff * progress;
return result < 0 ? result + 360f : result;
}
public static float interpolateScale(
float source, float target, float progress) {
return source + progress * (target - source);
}
public static String ensureNotNull(String value) {
return value == null ? "" : value;
}
public static float parseFloatSafely(String content, float defaultValue) {
if (content == null) return defaultValue;
try {
return Float.parseFloat(content);
} catch (NumberFormatException e) {
return defaultValue;
}
}
public static int parseIntSafely(String content, int defaultValue) {
if (content == null) return defaultValue;
try {
return Integer.parseInt(content);
} catch (NumberFormatException e) {
return defaultValue;
}
}
public static boolean isNullOrEmpty(String exifMake) {
return TextUtils.isEmpty(exifMake);
}
public static void waitWithoutInterrupt(Object object) {
try {
object.wait();
} catch (InterruptedException e) {
Log.w(TAG, "unexpected interrupt: " + object);
}
}
public static boolean handleInterrruptedException(Throwable e) {
// A helper to deal with the interrupt exception
// If an interrupt detected, we will setup the bit again.
if (e instanceof InterruptedIOException
|| e instanceof InterruptedException) {
Thread.currentThread().interrupt();
return true;
}
return false;
}
/**
* @return String with special XML characters escaped.
*/
public static String escapeXml(String s) {
StringBuilder sb = new StringBuilder();
for (int i = 0, len = s.length(); i < len; ++i) {
char c = s.charAt(i);
switch (c) {
case '<': sb.append("<"); break;
case '>': sb.append(">"); break;
case '\"': sb.append("""); break;
case '\'': sb.append("'"); break;
case '&': sb.append("&"); break;
default: sb.append(c);
}
}
return sb.toString();
}
public static String getUserAgent(Context context) {
PackageInfo packageInfo;
try {
packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
} catch (NameNotFoundException e) {
throw new IllegalStateException("getPackageInfo failed");
}
return String.format("%s/%s; %s/%s/%s/%s; %s/%s/%s",
packageInfo.packageName,
packageInfo.versionName,
Build.BRAND,
Build.DEVICE,
Build.MODEL,
Build.ID,
Build.VERSION.SDK_INT,
Build.VERSION.RELEASE,
Build.VERSION.INCREMENTAL);
}
public static String[] copyOf(String[] source, int newSize) {
String[] result = new String[newSize];
newSize = Math.min(source.length, newSize);
System.arraycopy(source, 0, result, 0, newSize);
return result;
}
// Mask information for debugging only. It returns info.toString() directly
// for debugging build (i.e., 'eng' and 'userdebug') and returns a mask ("****")
// in release build to protect the information (e.g. for privacy issue).
public static String maskDebugInfo(Object info) {
if (info == null) return null;
String s = info.toString();
int length = Math.min(s.length(), MASK_STRING.length());
return IS_DEBUG_BUILD ? s : MASK_STRING.substring(0, length);
}
// This method should be ONLY used for debugging.
public static void debug(String message, Object ... args) {
Log.v(DEBUG_TAG, String.format(message, args));
}
}
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