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JMockit is a Java toolkit for automated developer testing.
It contains mocking/faking APIs and a code coverage tool, supporting both JUnit and TestNG.
The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested
in isolation from selected dependencies.
/*
* Copyright (c) 2006 JMockit developers
* This file is subject to the terms of the MIT license (see LICENSE.txt).
*/
package mockit.internal.util;
import java.lang.reflect.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;
import javax.annotation.*;
import static java.util.Collections.*;
import mockit.asm.*;
import static mockit.internal.util.Utilities.*;
/**
* Provides default values for each type, typically used for returning default values according to method return types.
*/
@SuppressWarnings("ZeroLengthArrayAllocation")
public final class DefaultValues
{
private DefaultValues() {}
private static final Integer ZERO_INT = 0;
private static final Long ZERO_LONG = 0L;
private static final Float ZERO_FLOAT = 0.0F;
private static final Double ZERO_DOUBLE = 0.0;
private static final Byte ZERO_BYTE = 0;
private static final Short ZERO_SHORT = 0;
private static final Character ZERO_CHAR = '\0';
private static final Map TYPE_DESC_TO_VALUE_MAP = new HashMap<>();
private static final Map ELEM_TYPE_TO_ONE_D_ARRAY = new HashMap<>();
static {
TYPE_DESC_TO_VALUE_MAP.put("Z", Boolean.FALSE);
TYPE_DESC_TO_VALUE_MAP.put("C", ZERO_CHAR);
TYPE_DESC_TO_VALUE_MAP.put("B", ZERO_BYTE);
TYPE_DESC_TO_VALUE_MAP.put("S", ZERO_SHORT);
TYPE_DESC_TO_VALUE_MAP.put("I", ZERO_INT);
TYPE_DESC_TO_VALUE_MAP.put("F", ZERO_FLOAT);
TYPE_DESC_TO_VALUE_MAP.put("J", ZERO_LONG);
TYPE_DESC_TO_VALUE_MAP.put("D", ZERO_DOUBLE);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Boolean;", Boolean.FALSE);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Character;", ZERO_CHAR);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Byte;", ZERO_BYTE);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Short;", ZERO_SHORT);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Integer;", ZERO_INT);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Float;", ZERO_FLOAT);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Long;", ZERO_LONG);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Double;", ZERO_DOUBLE);
TYPE_DESC_TO_VALUE_MAP.put("Ljava/lang/Iterable;", emptyList());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Enumeration;", enumeration(emptyList()));
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Collection;", emptyList());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/List;", emptyList());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Set;", emptySet());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/SortedSet;", unmodifiableSortedSet(new TreeSet<>()));
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Map;", emptyMap());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/SortedMap;", unmodifiableSortedMap(new TreeMap<>()));
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Iterator;", emptyList().iterator());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/ListIterator;", emptyList().listIterator());
ELEM_TYPE_TO_ONE_D_ARRAY.put("[Z", new boolean[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[C", new char[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[B", new byte[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[S", new short[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[I", new int[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[F", new float[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[J", new long[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[D", new double[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[Ljava/lang/Object;", new Object[0]);
ELEM_TYPE_TO_ONE_D_ARRAY.put("[Ljava/lang/String;", new String[0]);
if (JAVA8) {
addJava8TypeMapEntries();
}
}
@SuppressWarnings("Since15")
private static void addJava8TypeMapEntries() {
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Optional;", Optional.empty());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/OptionalInt;", OptionalInt.empty());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/OptionalLong;", OptionalLong.empty());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/OptionalDouble;", OptionalDouble.empty());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Spliterator;", Spliterators.emptySpliterator());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Spliterator$OfInt;", Spliterators.emptyIntSpliterator());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Spliterator$OfLong;", Spliterators.emptyLongSpliterator());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/Spliterator$OfDouble;", Spliterators.emptyDoubleSpliterator());
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/PrimitiveIterator$OfInt;", new PrimitiveIterator.OfInt() {
@Override public int nextInt() { throw new NoSuchElementException(); }
@Override public Integer next() { throw new NoSuchElementException(); }
@Override public boolean hasNext() { return false; }
@Override public void forEachRemaining(IntConsumer action) {}
});
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/PrimitiveIterator$OfLong;", new PrimitiveIterator.OfLong() {
@Override public long nextLong() { throw new NoSuchElementException(); }
@Override public Long next() { throw new NoSuchElementException(); }
@Override public boolean hasNext() { return false; }
@Override public void forEachRemaining(LongConsumer action) {}
});
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/PrimitiveIterator$OfDouble;", new PrimitiveIterator.OfDouble() {
@Override public double nextDouble() { throw new NoSuchElementException(); }
@Override public Double next() { throw new NoSuchElementException(); }
@Override public boolean hasNext() { return false; }
@Override public void forEachRemaining(DoubleConsumer action) {}
});
// These are static interface methods, which can't be compiled on "-source 1.7".
//noinspection OverlyBroadCatchBlock
try {
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/stream/Stream;", Stream.class.getMethod("empty").invoke(null));
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/stream/IntStream;", IntStream.class.getMethod("empty").invoke(null));
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/stream/LongStream;", LongStream.class.getMethod("empty").invoke(null));
TYPE_DESC_TO_VALUE_MAP.put("Ljava/util/stream/DoubleStream;", DoubleStream.class.getMethod("empty").invoke(null));
} catch (Exception ignore) {}
}
@Nonnull
public static String getReturnTypeDesc(@Nonnull String methodNameAndDesc) {
int rightParen = methodNameAndDesc.indexOf(')') + 1;
return methodNameAndDesc.substring(rightParen);
}
@Nullable
public static Object computeForReturnType(@Nonnull String methodNameAndDesc) {
String typeDesc = getReturnTypeDesc(methodNameAndDesc);
return computeForType(typeDesc);
}
@Nullable
public static Object computeForType(@Nonnull String typeDesc) {
char typeDescChar = typeDesc.charAt(0);
if (typeDescChar == 'V') {
return null;
}
Object defaultValue = TYPE_DESC_TO_VALUE_MAP.get(typeDesc);
if (defaultValue != null) {
return defaultValue;
}
if (typeDescChar == 'L') {
return null;
}
// It's an array.
return computeForArrayType(typeDesc);
}
@Nonnull
public static Object computeForArrayType(@Nonnull String typeDesc) {
Object emptyArray = ELEM_TYPE_TO_ONE_D_ARRAY.get(typeDesc);
if (emptyArray == null) {
emptyArray = newEmptyArray(typeDesc);
}
return emptyArray;
}
@Nonnull
private static Object newEmptyArray(@Nonnull String typeDesc) {
ArrayType type = ArrayType.create(typeDesc);
Class elementType = TypeDescriptor.getClassForType(type.getElementType());
return Array.newInstance(elementType, new int[type.getDimensions()]);
}
@Nullable
public static Object computeForType(@Nonnull Class type) {
if (type.isArray()) {
return Array.newInstance(type.getComponentType(), 0);
}
if (type != void.class && type.isPrimitive()) {
return defaultValueForPrimitiveType(type);
}
return computeForWrapperType(type);
}
@Nonnull
public static Object defaultValueForPrimitiveType(@Nonnull Class type) {
if (type == int.class) {
return ZERO_INT;
}
else if (type == boolean.class) {
return Boolean.FALSE;
}
else if (type == long.class) {
return ZERO_LONG;
}
else if (type == double.class) {
return ZERO_DOUBLE;
}
else if (type == float.class) {
return ZERO_FLOAT;
}
else if (type == char.class) {
return ZERO_CHAR;
}
else if (type == byte.class) {
return ZERO_BYTE;
}
else {
return ZERO_SHORT;
}
}
@Nullable @SuppressWarnings("unchecked")
public static T computeForWrapperType(@Nonnull Type type) {
if (type == Integer.class) {
return (T) ZERO_INT;
}
if (type == Boolean.class) {
return (T) Boolean.FALSE;
}
if (type == Long.class) {
return (T) ZERO_LONG;
}
if (type == Double.class) {
return (T) ZERO_DOUBLE;
}
if (type == Float.class) {
return (T) ZERO_FLOAT;
}
if (type == Character.class) {
return (T) ZERO_CHAR;
}
if (type == Byte.class) {
return (T) ZERO_BYTE;
}
if (type == Short.class) {
return (T) ZERO_SHORT;
}
return null;
}
@Nullable @SuppressWarnings("unchecked")
public static T computeForWrapperType(@Nonnull String typeDesc) {
if ("java/lang/Integer".equals(typeDesc)) {
return (T) ZERO_INT;
}
if ("java/lang/Boolean".equals(typeDesc)) {
return (T) Boolean.FALSE;
}
if ("java/lang/Long".equals(typeDesc)) {
return (T) ZERO_LONG;
}
if ("java/lang/Double".equals(typeDesc)) {
return (T) ZERO_DOUBLE;
}
if ("java/lang/Float".equals(typeDesc)) {
return (T) ZERO_FLOAT;
}
if ("java/lang/Character".equals(typeDesc)) {
return (T) ZERO_CHAR;
}
if ("java/lang/Byte".equals(typeDesc)) {
return (T) ZERO_BYTE;
}
if ("java/lang/Short".equals(typeDesc)) {
return (T) ZERO_SHORT;
}
return null;
}
}