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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.codehaus.groovy.runtime.typehandling;
import groovy.lang.Closure;
import groovy.lang.GString;
import groovy.lang.GroovyRuntimeException;
import org.codehaus.groovy.reflection.ReflectionCache;
import org.codehaus.groovy.reflection.stdclasses.CachedSAMClass;
import org.codehaus.groovy.runtime.*;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.MessageFormat;
import java.util.*;
/**
* Class providing various type conversions, coercions and boxing/unboxing operations.
*
* @author Guillaume Laforge
*/
public class DefaultTypeTransformation {
protected static final Object[] EMPTY_ARGUMENTS = {};
protected static final BigInteger ONE_NEG = new BigInteger("-1");
private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
// --------------------------------------------------------
// unboxing methods
// --------------------------------------------------------
public static byte byteUnbox(Object value) {
Number n = castToNumber(value, byte.class);
return n.byteValue();
}
public static char charUnbox(Object value) {
return ShortTypeHandling.castToChar(value);
}
public static short shortUnbox(Object value) {
Number n = castToNumber(value, short.class);
return n.shortValue();
}
public static int intUnbox(Object value) {
Number n = castToNumber(value, int.class);
return n.intValue();
}
public static boolean booleanUnbox(Object value) {
return castToBoolean(value);
}
public static long longUnbox(Object value) {
Number n = castToNumber(value, long.class);
return n.longValue();
}
public static float floatUnbox(Object value) {
Number n = castToNumber(value, float.class);
return n.floatValue();
}
public static double doubleUnbox(Object value) {
Number n = castToNumber(value, double.class);
return n.doubleValue();
}
// --------------------------------------------------------
// boxing methods
// --------------------------------------------------------
@Deprecated
public static Object box(boolean value) {
return value ? Boolean.TRUE : Boolean.FALSE;
}
@Deprecated
public static Object box(byte value) {
return Byte.valueOf(value);
}
@Deprecated
public static Object box(char value) {
return Character.valueOf(value);
}
@Deprecated
public static Object box(short value) {
return Short.valueOf(value);
}
@Deprecated
public static Object box(int value) {
return Integer.valueOf(value);
}
@Deprecated
public static Object box(long value) {
return Long.valueOf(value);
}
@Deprecated
public static Object box(float value) {
return Float.valueOf(value);
}
@Deprecated
public static Object box(double value) {
return Double.valueOf(value);
}
public static Number castToNumber(Object object) {
// default to Number class in exception details, else use the specified Number subtype.
return castToNumber(object, Number.class);
}
public static Number castToNumber(Object object, Class type) {
if (object instanceof Number)
return (Number) object;
if (object instanceof Character) {
return Integer.valueOf(((Character) object).charValue());
}
if (object instanceof GString) {
String c = ((GString) object).toString();
if (c.length() == 1) {
return Integer.valueOf(c.charAt(0));
} else {
throw new GroovyCastException(c, type);
}
}
if (object instanceof String) {
String c = (String) object;
if (c.length() == 1) {
return Integer.valueOf(c.charAt(0));
} else {
throw new GroovyCastException(c, type);
}
}
throw new GroovyCastException(object, type);
}
/**
* Method used for coercing an object to a boolean value,
* thanks to an asBoolean() method added on types.
*
* @param object to coerce to a boolean value
* @return a boolean value
*/
public static boolean castToBoolean(Object object) {
// null is always false
if (object == null) {
return false;
}
// equality check is enough and faster than instanceof check, no need to check superclasses since Boolean is final
if (object.getClass() == Boolean.class) {
return ((Boolean)object).booleanValue();
}
// if the object is not null and no Boolean, try to call an asBoolean() method on the object
return (Boolean)InvokerHelper.invokeMethod(object, "asBoolean", InvokerHelper.EMPTY_ARGS);
}
@Deprecated
public static char castToChar(Object object) {
if (object instanceof Character) {
return ((Character) object).charValue();
} else if (object instanceof Number) {
Number value = (Number) object;
return (char) value.intValue();
} else {
String text = object.toString();
if (text.length() == 1) {
return text.charAt(0);
}
else {
throw new GroovyCastException(text,char.class);
}
}
}
public static Object castToType(Object object, Class type) {
if (object == null) return null;
if (type == Object.class) return object;
final Class aClass = object.getClass();
if (type == aClass) return object;
if (type.isAssignableFrom(aClass)) return object;
if (ReflectionCache.isArray(type)) return asArray(object, type);
if (type.isEnum()) {
return ShortTypeHandling.castToEnum(object, type);
} else if (Collection.class.isAssignableFrom(type)) {
return continueCastOnCollection(object,type);
} else if (type == String.class) {
return ShortTypeHandling.castToString(object);
} else if (type == Character.class) {
return ShortTypeHandling.castToChar(object);
} else if (type == Boolean.class) {
return castToBoolean(object);
} else if (type == Class.class) {
return ShortTypeHandling.castToClass(object);
} else if (type.isPrimitive()) {
return castToPrimitive(object,type);
}
return continueCastOnNumber(object,type);
}
private static Object continueCastOnCollection(Object object, Class type) {
int modifiers = type.getModifiers();
Collection answer;
if (object instanceof Collection && type.isAssignableFrom(LinkedHashSet.class) &&
(type == LinkedHashSet.class || Modifier.isAbstract(modifiers) || Modifier.isInterface(modifiers))) {
return new LinkedHashSet((Collection)object);
}
if (object.getClass().isArray()) {
if (type.isAssignableFrom(ArrayList.class) && (Modifier.isAbstract(modifiers) || Modifier.isInterface(modifiers))) {
answer = new ArrayList();
} else if (type.isAssignableFrom(LinkedHashSet.class) && (Modifier.isAbstract(modifiers) || Modifier.isInterface(modifiers))) {
answer = new LinkedHashSet();
} else {
// let's call the collections constructor
// passing in the list wrapper
try {
answer = (Collection) type.newInstance();
}
catch (Exception e) {
throw new GroovyCastException("Could not instantiate instance of: " + type.getName() + ". Reason: " + e);
}
}
// we cannot just wrap in a List as we support primitive type arrays
int length = Array.getLength(object);
for (int i = 0; i < length; i++) {
Object element = Array.get(object, i);
answer.add(element);
}
return answer;
}
return continueCastOnNumber(object,type);
}
private static Object continueCastOnNumber(Object object, Class type) {
if (Number.class.isAssignableFrom(type)) {
Number n = castToNumber(object, type);
if (type == Byte.class) {
return n.byteValue();
}
if (type == Character.class) {
return (char) n.intValue();
}
if (type == Short.class) {
return n.shortValue();
}
if (type == Integer.class) {
return n.intValue();
}
if (type == Long.class) {
return n.longValue();
}
if (type == Float.class) {
return n.floatValue();
}
if (type == Double.class) {
Double answer = n.doubleValue();
//throw a runtime exception if conversion would be out-of-range for the type.
if (!(n instanceof Double) && (answer == Double.NEGATIVE_INFINITY
|| answer == Double.POSITIVE_INFINITY)) {
throw new GroovyRuntimeException("Automatic coercion of " + n.getClass().getName()
+ " value " + n + " to double failed. Value is out of range.");
}
return answer;
}
if (type == BigDecimal.class) {
if (n instanceof Float || n instanceof Double) {
return new BigDecimal(n.doubleValue());
}
return new BigDecimal(n.toString());
}
if (type == BigInteger.class) {
if (object instanceof Float || object instanceof Double) {
BigDecimal bd = new BigDecimal(n.doubleValue());
return bd.toBigInteger();
}
if (object instanceof BigDecimal) {
return ((BigDecimal) object).toBigInteger();
}
return new BigInteger(n.toString());
}
}
return continueCastOnSAM(object, type);
}
private static Object castToPrimitive(Object object, Class type) {
if (type == boolean.class) {
return booleanUnbox(object);
} else if (type == byte.class) {
return byteUnbox(object);
} else if (type == char.class) {
return charUnbox(object);
} else if (type == short.class) {
return shortUnbox(object);
} else if (type == int.class) {
return intUnbox(object);
} else if (type == long.class) {
return longUnbox(object);
} else if (type == float.class) {
return floatUnbox(object);
} else if (type == double.class) {
Double answer = new Double(doubleUnbox(object));
//throw a runtime exception if conversion would be out-of-range for the type.
if (!(object instanceof Double) && (answer.doubleValue() == Double.NEGATIVE_INFINITY
|| answer.doubleValue() == Double.POSITIVE_INFINITY)) {
throw new GroovyRuntimeException("Automatic coercion of " + object.getClass().getName()
+ " value " + object + " to double failed. Value is out of range.");
}
return answer;
} //nothing else possible
throw new GroovyCastException(object,type);
}
private static Object continueCastOnSAM(Object object, Class type) {
if (object instanceof Closure) {
Method m = CachedSAMClass.getSAMMethod(type);
if (m!=null) {
return CachedSAMClass.coerceToSAM((Closure) object, m, type, type.isInterface());
}
}
Object[] args = null;
if (object instanceof Collection) {
// let's try invoke the constructor with the list as arguments
// such as for creating a Dimension, Point, Color etc.
Collection collection = (Collection) object;
args = collection.toArray();
} else if (object instanceof Object[]) {
args = (Object[]) object;
} else if (object instanceof Map) {
// emulate named params constructor
args = new Object[1];
args[0] = object;
}
Exception nested = null;
if (args != null) {
try {
return InvokerHelper.invokeConstructorOf(type, args);
} catch (InvokerInvocationException iie){
throw iie;
} catch (GroovyRuntimeException e) {
if(e.getMessage().contains("Could not find matching constructor for")) {
try {
return InvokerHelper.invokeConstructorOf(type, object);
} catch (InvokerInvocationException iie){
throw iie;
} catch (Exception ex) {
// let's ignore exception and return the original object
// as the caller has more context to be able to throw a more
// meaningful exception (but stash to get message later)
nested = e;
}
} else {
nested = e;
}
} catch (Exception e) {
// let's ignore exception and return the original object
// as the caller has more context to be able to throw a more
// meaningful exception (but stash to get message later)
nested = e;
}
}
GroovyCastException gce;
if (nested != null) {
gce = new GroovyCastException(object, type, nested);
} else {
gce = new GroovyCastException(object, type);
}
throw gce;
}
public static Object asArray(Object object, Class type) {
if (type.isAssignableFrom(object.getClass())) {
return object;
}
Collection list = asCollection(object);
int size = list.size();
Class elementType = type.getComponentType();
Object array = Array.newInstance(elementType, size);
int idx = 0;
for (Iterator iter = list.iterator(); iter.hasNext(); idx++) {
Object element = iter.next();
Array.set(array, idx, castToType(element, elementType));
}
return array;
}
public static Collection asCollection(T[] value) {
return arrayAsCollection(value);
}
public static Collection asCollection(Object value) {
if (value == null) {
return Collections.EMPTY_LIST;
}
else if (value instanceof Collection) {
return (Collection) value;
}
else if (value instanceof Map) {
Map map = (Map) value;
return map.entrySet();
}
else if (value.getClass().isArray()) {
return arrayAsCollection(value);
}
else if (value instanceof MethodClosure) {
MethodClosure method = (MethodClosure) value;
IteratorClosureAdapter adapter = new IteratorClosureAdapter(method.getDelegate());
method.call(adapter);
return adapter.asList();
}
else if (value instanceof String) {
return StringGroovyMethods.toList((String) value);
}
else if (value instanceof GString) {
return StringGroovyMethods.toList(value.toString());
}
else if (value instanceof File) {
try {
return ResourceGroovyMethods.readLines((File) value);
}
catch (IOException e) {
throw new GroovyRuntimeException("Error reading file: " + value, e);
}
}
else if (value instanceof Class && ((Class)value).isEnum()) {
Object[] values = (Object[])InvokerHelper.invokeMethod(value, "values", EMPTY_OBJECT_ARRAY);
return Arrays.asList(values);
}
else {
// let's assume it's a collection of 1
return Collections.singletonList(value);
}
}
public static Collection arrayAsCollection(Object value) {
if (value.getClass().getComponentType().isPrimitive()) {
return primitiveArrayToList(value);
}
return arrayAsCollection((Object[]) value);
}
public static Collection arrayAsCollection(T[] value) {
return Arrays.asList((T[]) value);
}
/**
* Determines whether the value object is a Class object representing a
* subclass of java.lang.Enum. Uses class name check to avoid breaking on
* pre-Java 5 JREs.
*
* @param value an object
* @return true if the object is an Enum
*/
@Deprecated
public static boolean isEnumSubclass(Object value) {
if (value instanceof Class) {
Class superclass = ((Class)value).getSuperclass();
while (superclass != null) {
if (superclass.getName().equals("java.lang.Enum")) {
return true;
}
superclass = superclass.getSuperclass();
}
}
return false;
}
/**
* Allows conversion of arrays into a mutable List
*
* @param array an array
* @return the array as a List
*/
public static List primitiveArrayToList(Object array) {
int size = Array.getLength(array);
List list = new ArrayList(size);
for (int i = 0; i < size; i++) {
Object item = Array.get(array, i);
if (item != null && item.getClass().isArray() && item.getClass().getComponentType().isPrimitive()) {
item = primitiveArrayToList(item);
}
list.add(item);
}
return list;
}
public static Object[] primitiveArrayBox(Object array) {
int size = Array.getLength(array);
Object[] ret = (Object[]) Array.newInstance(ReflectionCache.autoboxType(array.getClass().getComponentType()), size);
for (int i = 0; i < size; i++) {
ret[i]=Array.get(array, i);
}
return ret;
}
/**
* Compares the two objects handling nulls gracefully and performing numeric type coercion if required
*/
public static int compareTo(Object left, Object right) {
return compareToWithEqualityCheck(left, right, false);
}
private static int compareToWithEqualityCheck(Object left, Object right, boolean equalityCheckOnly) {
if (left == right) {
return 0;
}
if (left == null) {
return -1;
}
else if (right == null) {
return 1;
}
if (left instanceof Comparable) {
if (left instanceof Number) {
if (right instanceof Character || right instanceof Number) {
return DefaultGroovyMethods.compareTo((Number) left, castToNumber(right));
}
if (isValidCharacterString(right)) {
return DefaultGroovyMethods.compareTo((Number) left, ShortTypeHandling.castToChar(right));
}
}
else if (left instanceof Character) {
if (isValidCharacterString(right)) {
return DefaultGroovyMethods.compareTo((Character)left, ShortTypeHandling.castToChar(right));
}
if (right instanceof Number) {
return DefaultGroovyMethods.compareTo((Character)left,(Number)right);
}
}
else if (right instanceof Number) {
if (isValidCharacterString(left)) {
return DefaultGroovyMethods.compareTo(ShortTypeHandling.castToChar(left),(Number) right);
}
}
else if (left instanceof String && right instanceof Character) {
return ((String) left).compareTo(right.toString());
}
else if (left instanceof String && right instanceof GString) {
return ((String) left).compareTo(right.toString());
}
if (!equalityCheckOnly || left.getClass().isAssignableFrom(right.getClass())
|| (right.getClass() != Object.class && right.getClass().isAssignableFrom(left.getClass())) //GROOVY-4046
|| (left instanceof GString && right instanceof String)) {
Comparable comparable = (Comparable) left;
return comparable.compareTo(right);
}
}
if (equalityCheckOnly) {
return -1; // anything other than 0
}
throw new GroovyRuntimeException(
MessageFormat.format("Cannot compare {0} with value ''{1}'' and {2} with value ''{3}''",
left.getClass().getName(),
left,
right.getClass().getName(),
right));
}
public static boolean compareEqual(Object left, Object right) {
if (left == right) return true;
if (left == null) return right instanceof NullObject;
if (right == null) return left instanceof NullObject;
if (left instanceof Comparable) {
return compareToWithEqualityCheck(left, right, true) == 0;
}
// handle arrays on both sides as special case for efficiency
Class leftClass = left.getClass();
Class rightClass = right.getClass();
if (leftClass.isArray() && rightClass.isArray()) {
return compareArrayEqual(left, right);
}
if (leftClass.isArray() && leftClass.getComponentType().isPrimitive()) {
left = primitiveArrayToList(left);
}
if (rightClass.isArray() && rightClass.getComponentType().isPrimitive()) {
right = primitiveArrayToList(right);
}
if (left instanceof Object[] && right instanceof List) {
return DefaultGroovyMethods.equals((Object[]) left, (List) right);
}
if (left instanceof List && right instanceof Object[]) {
return DefaultGroovyMethods.equals((List) left, (Object[]) right);
}
if (left instanceof List && right instanceof List) {
return DefaultGroovyMethods.equals((List) left, (List) right);
}
if (left instanceof Map.Entry && right instanceof Map.Entry) {
Object k1 = ((Map.Entry)left).getKey();
Object k2 = ((Map.Entry)right).getKey();
if (k1 == k2 || (k1 != null && k1.equals(k2))) {
Object v1 = ((Map.Entry)left).getValue();
Object v2 = ((Map.Entry)right).getValue();
if (v1 == v2 || (v1 != null && DefaultTypeTransformation.compareEqual(v1, v2)))
return true;
}
return false;
}
return ((Boolean) InvokerHelper.invokeMethod(left, "equals", right)).booleanValue();
}
public static boolean compareArrayEqual(Object left, Object right) {
if (left == null) {
return right == null;
}
if (right == null) {
return false;
}
if (Array.getLength(left) != Array.getLength(right)) {
return false;
}
for (int i = 0; i < Array.getLength(left); i++) {
Object l = Array.get(left, i);
Object r = Array.get(right, i);
if (!compareEqual(l, r)) return false;
}
return true;
}
/**
* @return true if the given value is a valid character string (i.e. has length of 1)
*/
private static boolean isValidCharacterString(Object value) {
if (value instanceof String) {
String s = (String) value;
if (s.length() == 1) {
return true;
}
}
return false;
}
@Deprecated
public static int[] convertToIntArray(Object a) {
int[] ans = null;
// conservative coding
if (a.getClass().getName().equals("[I")) {
ans = (int[]) a;
}
else {
Object[] ia = (Object[]) a;
ans = new int[ia.length];
for (int i = 0; i < ia.length; i++) {
if (ia[i] == null) {
continue;
}
ans[i] = ((Number) ia[i]).intValue();
}
}
return ans;
}
@Deprecated
public static boolean[] convertToBooleanArray(Object a) {
boolean[] ans = null;
// conservative coding
if (a instanceof boolean[]) {
ans = (boolean[]) a;
} else {
Object[] ia = (Object[]) a;
ans = new boolean[ia.length];
for (int i = 0; i < ia.length; i++) {
if (ia[i] == null) continue;
ans[i] = ((Boolean) ia[i]).booleanValue();
}
}
return ans;
}
@Deprecated
public static byte[] convertToByteArray(Object a) {
byte[] ans = null;
// conservative coding
if (a instanceof byte[]) {
ans = (byte[]) a;
} else {
Object[] ia = (Object[]) a;
ans = new byte[ia.length];
for (int i = 0; i < ia.length; i++) {
if (ia[i] != null) {
ans[i] = ((Number) ia[i]).byteValue();
}
}
}
return ans;
}
@Deprecated
public static short[] convertToShortArray(Object a) {
short[] ans = null;
// conservative coding
if (a instanceof short[]) {
ans = (short[]) a;
} else {
Object[] ia = (Object[]) a;
ans = new short[ia.length];
for (int i = 0; i < ia.length; i++) {
ans[i] = ((Number) ia[i]).shortValue();
}
}
return ans;
}
@Deprecated
public static char[] convertToCharArray(Object a) {
char[] ans = null;
// conservative coding
if (a instanceof char[]) {
ans = (char[]) a;
} else {
Object[] ia = (Object[]) a;
ans = new char[ia.length];
for (int i = 0; i < ia.length; i++) {
if (ia[i] == null) {
continue;
}
ans[i] = ((Character) ia[i]).charValue();
}
}
return ans;
}
@Deprecated
public static long[] convertToLongArray(Object a) {
long[] ans = null;
// conservative coding
if (a instanceof long[]) {
ans = (long[]) a;
} else {
Object[] ia = (Object[]) a;
ans = new long[ia.length];
for (int i = 0; i < ia.length; i++) {
if (ia[i] == null) {
continue;
}
ans[i] = ((Number) ia[i]).longValue();
}
}
return ans;
}
@Deprecated
public static float[] convertToFloatArray(Object a) {
float[] ans = null;
// conservative coding
if (a instanceof float[]) {
ans = (float[]) a;
} else {
Object[] ia = (Object[]) a;
ans = new float[ia.length];
for (int i = 0; i < ia.length; i++) {
if (ia[i] == null) {
continue;
}
ans[i] = ((Number) ia[i]).floatValue();
}
}
return ans;
}
@Deprecated
public static double[] convertToDoubleArray(Object a) {
double[] ans = null;
// conservative coding
if (a instanceof double[]) {
ans = (double[]) a;
} else {
Object[] ia = (Object[]) a;
ans = new double[ia.length];
for (int i = 0; i < ia.length; i++) {
if (ia[i] == null) {
continue;
}
ans[i] = ((Number) ia[i]).doubleValue();
}
}
return ans;
}
@Deprecated
public static Object convertToPrimitiveArray(Object a, Class type) {
if (type == Byte.TYPE) {
return convertToByteArray(a);
}
if (type == Boolean.TYPE) {
return convertToBooleanArray(a);
}
if (type == Short.TYPE) {
return convertToShortArray(a);
}
if (type == Character.TYPE) {
return convertToCharArray(a);
}
if (type == Integer.TYPE) {
return convertToIntArray(a);
}
if (type == Long.TYPE) {
return convertToLongArray(a);
}
if (type == Float.TYPE) {
return convertToFloatArray(a);
}
if (type == Double.TYPE) {
return convertToDoubleArray(a);
}
else {
return a;
}
}
@Deprecated
public static Character getCharFromSizeOneString(Object value) {
if (value instanceof GString) value = value.toString();
if (value instanceof String) {
String s = (String) value;
if (s.length() != 1) throw new IllegalArgumentException("String of length 1 expected but got a bigger one");
return new Character(s.charAt(0));
} else {
return ((Character) value);
}
}
public static Object castToVargsArray(Object[] origin, int firstVargsPos, Class arrayType) {
Class componentType = arrayType.getComponentType();
if (firstVargsPos>= origin.length) return Array.newInstance(componentType, 0);
int length = origin.length-firstVargsPos;
if (length==1 && arrayType.isInstance(origin[firstVargsPos])) return origin[firstVargsPos];
Object newArray = Array.newInstance(componentType, length);
for (int i=0; i