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Merge pull request #809 from serso/my-android
Pull request for #769
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,7 @@ | ||
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| description 'Android compatibility module' | ||
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| dependencies { | ||
| } | ||
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| useReducedJdk(project) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package java.lang; | ||
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| import java.lang.annotation.ElementType; | ||
| import java.lang.annotation.Retention; | ||
| import java.lang.annotation.RetentionPolicy; | ||
| import java.lang.annotation.Target; | ||
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| /** | ||
| * This class won't be loaded at runtime as it "overrides" a bootstrap class from JDK. | ||
| */ | ||
| @Retention(RetentionPolicy.RUNTIME) | ||
| @Target({ElementType.CONSTRUCTOR, ElementType.METHOD}) | ||
| public @interface SafeVarargs {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| package org.web3j.compat; | ||
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| /** | ||
| * Ports {@link java.util.function.BiFunction}. | ||
| */ | ||
| public interface BiFunction<T, U, R> { | ||
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| R apply(T t, U u); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,91 @@ | ||
| package org.web3j.compat; | ||
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| import java.lang.reflect.Type; | ||
| import java.math.BigInteger; | ||
| import java.nio.charset.Charset; | ||
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| /** | ||
| * Provides compatibility methods to substitute those methods from Java SDK that | ||
| * are not supported on Android. | ||
| */ | ||
| public final class Compat { | ||
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| /** | ||
| * Ports {@link java.nio.charset.StandardCharsets#UTF_8}. | ||
| */ | ||
| public static final Charset UTF_8 = Charset.forName("UTF-8"); | ||
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| private static final BigInteger LONG_MAX = BigInteger.valueOf(Long.MAX_VALUE); | ||
| private static final BigInteger LONG_MIN = BigInteger.valueOf(Long.MIN_VALUE); | ||
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| private Compat() { | ||
| } | ||
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| /** | ||
| * Ports {@link String#join(CharSequence, CharSequence...)}. | ||
| */ | ||
| public static String join(CharSequence delimiter, CharSequence... elements) { | ||
| if (elements.length == 0) { | ||
| return ""; | ||
| } | ||
| final StringBuilder sb = new StringBuilder(7 * elements.length); | ||
| sb.append(elements[0]); | ||
| for (int i = 1; i < elements.length; i++) { | ||
| sb.append(delimiter); | ||
| sb.append(elements[i]); | ||
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| } | ||
| return sb.toString(); | ||
| } | ||
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| /** | ||
| * Ports {@link BigInteger#longValueExact()}. | ||
| */ | ||
| public static long longValueExact(BigInteger value) { | ||
| if (value.compareTo(LONG_MIN) >= 0 && value.compareTo(LONG_MAX) <= 0) { | ||
| return value.longValue(); | ||
| } | ||
| throw new ArithmeticException("BigInteger out of long range"); | ||
| } | ||
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| /** | ||
| * Ports {@link Type#getTypeName()}. | ||
| */ | ||
| public static String getTypeName(Type type) { | ||
| if (type instanceof Class) { | ||
| return getClassName((Class)type); | ||
| } | ||
| return type.toString(); | ||
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| } | ||
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| /** | ||
| * Copied from {@link Class#getTypeName()}. | ||
| */ | ||
| private static String getClassName(Class type) { | ||
| if (type.isArray()) { | ||
| try { | ||
| Class<?> cl = type; | ||
| int dimensions = 0; | ||
| while (cl.isArray()) { | ||
| dimensions++; | ||
| cl = cl.getComponentType(); | ||
| } | ||
| StringBuilder sb = new StringBuilder(); | ||
| sb.append(cl.getName()); | ||
| for (int i = 0; i < dimensions; i++) { | ||
| sb.append("[]"); | ||
| } | ||
| return sb.toString(); | ||
| } catch (Throwable e) { /*FALLTHRU*/ } | ||
| } | ||
| return type.getName(); | ||
| } | ||
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| /** | ||
| * Ports {@link Boolean#hashCode(boolean)}. | ||
| */ | ||
| public static int hashCode(boolean value) { | ||
| return value ? 1231 : 1237; | ||
| } | ||
| } |
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