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package oracle.toplink.essentials.internal.helper;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Date;
import java.util.HashSet;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
/**
* INTERNAL
* This class is a helper class providing type information.
* Its implementation uses Java reflection to calculate the type information.
*/
public class BasicTypeHelperImpl {
/** Set of intergral types and its wrapper classes. */
private static Set integralTypes = new HashSet();
/** Set of floating point types and its wrapper classes. */
private static Set floatingPointTypes = new HashSet();
/** Set of date classes. */
private static Set dateClasses = new HashSet();
/** Maps primtives types to their wrapper classes. */
private static Map primitiveToWrapper = new HashMap();
/** Maps wrapper classes to their primitive types. */
private static Map wrapperToPrimitive = new HashMap();
static {
// Inilialize set of integral types plus their wrapper classes
integralTypes.add(byte.class);
integralTypes.add(Byte.class);
integralTypes.add(short.class);
integralTypes.add(Short.class);
integralTypes.add(char.class);
integralTypes.add(Character.class);
integralTypes.add(int.class);
integralTypes.add(Integer.class);
integralTypes.add(long.class);
integralTypes.add(Long.class);
// Inilialize set of floating point types plus their wrapper classes
floatingPointTypes.add(float.class);
floatingPointTypes.add(Float.class);
floatingPointTypes.add(double.class);
floatingPointTypes.add(Double.class);
// Inilialize set of floating point types plus their wrapper classes
dateClasses.add(java.util.Date.class);
dateClasses.add(java.util.Calendar.class);
dateClasses.add(java.sql.Date.class);
dateClasses.add(java.sql.Time.class);
dateClasses.add(java.sql.Timestamp.class);
// Inilialize mapping primitives to their wrapper classes
primitiveToWrapper.put(boolean.class, Boolean.class);
primitiveToWrapper.put(byte.class, Byte.class);
primitiveToWrapper.put(short.class, Short.class);
primitiveToWrapper.put(char.class, Character.class);
primitiveToWrapper.put(int.class, Integer.class);
primitiveToWrapper.put(long.class, Long.class);
primitiveToWrapper.put(float.class, Float.class);
primitiveToWrapper.put(double.class, Double.class);
// Inilialize mapping wrapper classes to their primitives
wrapperToPrimitive.put(Boolean.class, boolean.class);
wrapperToPrimitive.put(Byte.class, byte.class);
wrapperToPrimitive.put(Short.class, short.class);
wrapperToPrimitive.put(Character.class, char.class);
wrapperToPrimitive.put(Integer.class, int.class);
wrapperToPrimitive.put(Long.class, long.class);
wrapperToPrimitive.put(Float.class, float.class);
wrapperToPrimitive.put(Double.class, double.class);
}
/** A singleton for this class */
private static final BasicTypeHelperImpl singleton = new BasicTypeHelperImpl();
/** Gets instance of this class */
public static BasicTypeHelperImpl getInstance() {
return singleton;
}
/** Returns the name of the specified type. */
public String getTypeName(Object type) {
Class clazz = getJavaClass(type);
return (clazz == null) ? null : clazz.getName();
}
/** Returns the class object of the specified type. */
public Class getJavaClass(Object type) {
Class clazz = null;
if (type instanceof Class) {
clazz = (Class)type;
} else if (type instanceof ClassDescriptor) {
clazz = ((ClassDescriptor)type).getJavaClass();
}
return clazz;
}
/** Returns the Object type representation.*/
public Object getObjectType() {
return Object.class;
}
/** Returns the boolean type representation.*/
public Object getBooleanType() {
return boolean.class;
}
/** Returns the Boolean class representation.*/
public Object getBooleanClassType() {
return Boolean.class;
}
/** Returns the char type representation.*/
public Object getCharType() {
return char.class;
}
/** Returns the Character class representation.*/
public Object getCharacterClassType() {
return Character.class;
}
/** Returns the byte type representation.*/
public Object getByteType() {
return byte.class;
}
/** Returns the Byte class representation.*/
public Object getByteClassType() {
return Byte.class;
}
/** Returns the short type representation.*/
public Object getShortType() {
return short.class;
}
/** Returns the Short class representation.*/
public Object getShortClassType() {
return Short.class;
}
/** Returns the int type representation.*/
public Object getIntType() {
return int.class;
}
/** Returns the Inter class representation.*/
public Object getIntegerClassType() {
return Integer.class;
}
/** Returns the long type representation.*/
public Object getLongType() {
return long.class;
}
/** Returns the type representation of class Long.*/
public Object getLongClassType() {
return Long.class;
}
/** Returns the float type representation.*/
public Object getFloatType() {
return float.class;
}
/** Returns the type representation of class Float.*/
public Object getFloatClassType() {
return Float.class;
}
/** Returns the double type representation.*/
public Object getDoubleType() {
return double.class;
}
/** Returns the type representation of class Double.*/
public Object getDoubleClassType() {
return Double.class;
}
/** Returns the String type representation.*/
public Object getStringType() {
return String.class;
}
/** Returns the BigInteger type representation.*/
public Object getBigIntegerType() {
return BigInteger.class;
}
/** Returns the BigDecimal type representation.*/
public Object getBigDecimalType() {
return BigDecimal.class;
}
/** Returns the java.util.Date type representation.*/
public Object getDateType() {
return Date.class;
}
/** */
public boolean isEnumType(Object type) {
Class clazz = getJavaClass(type);
return (clazz != null) && (clazz.isEnum());
}
/** */
public boolean isNumericType(Object type) {
return isIntegralType(type) || isFloatingPointType(type) ||
isBigIntegerType(type) || isBigDecimalType(type);
}
/**
* Returns true if the specified type represents an
* integral type or a wrapper class of an integral type.
*/
public boolean isIntegralType(Object type) {
return integralTypes.contains(type);
}
/**
* Returns true if the specified type represents an
* floating point type or a wrapper class of an floating point type.
*/
public boolean isFloatingPointType(Object type) {
return floatingPointTypes.contains(type);
}
/** Returns true if the specified type is a wrapper class. */
public boolean isWrapperClass(Object type) {
return wrapperToPrimitive.containsKey(type);
}
/**
* Returns true if type is the boolean primitive type or the Boolean wrapper class
*/
public boolean isBooleanType(Object type) {
return (type == getBooleanType()) || (type == getBooleanClassType());
}
/**
* Returns true if type is the char primitive type or the Character wrapper class
*/
public boolean isCharacterType(Object type) {
return (type == getCharType()) || (type == getCharacterClassType());
}
/**
* Returns true if type is the byte primitive type or the Byte wrapper class
*/
public boolean isByteType(Object type) {
return (type == getByteType()) || (type == getByteClassType());
}
/**
* Returns true if type is the short primitive type or the Short wrapper class
*/
public boolean isShortType(Object type) {
return (type == getShortType()) || (type == getShortClassType());
}
/**
* Returns true if type is the int primitive type or the Integer wrapper class
*/
public boolean isIntType(Object type) {
return (type == getIntType()) || (type == getIntegerClassType());
}
/**
* Returns true if type is the long primitive type or the Long wrapper class
*/
public boolean isLongType(Object type) {
return (type == getLongType()) || (type == getLongClassType());
}
/**
* Returns true if type is the float primitive type or the Float wrapper class
*/
public boolean isFloatType(Object type) {
return (type == getFloatType()) || (type == getFloatClassType());
}
/**
* Returns true if type is the double primitive type or the Double wrapper class
*/
public boolean isDoubleType(Object type) {
return (type == getDoubleType()) || (type == getDoubleClassType());
}
/** Returns true if the specified type represents java.lang.String. */
public boolean isStringType(Object type) {
return type == getStringType();
}
/** */
public boolean isDateClass(Object type) {
return dateClasses.contains(type);
}
/** */
public boolean isBigIntegerType(Object type) {
return type == getBigIntegerType();
}
/** */
public boolean isBigDecimalType(Object type) {
return type == getBigDecimalType();
}
/** Returns true if the specified type denotes an orable type */
public boolean isOrderableType(Object type) {
return isNumericType(type) || isStringType(type) ||
isDateClass(type) || isEnumType(type);
}
/** */
public boolean isAssignableFrom(Object left, Object right) {
if ((left == null) || (right == null)) {
return false;
}
// chec for identical types
if (left == right) {
return true;
}
// numeric types are compatible
Object promoted = extendedBinaryNumericPromotion(left, right);
if (promoted != null) {
return true;
}
// date types are compatible
if (isDateClass(left) && isDateClass(right)) {
return true;
}
// handle boolean and Boolean
if (isBooleanType(left) && isBooleanType(right)) {
return true;
}
// check for inheritance and implements
return getJavaClass(left).isAssignableFrom(getJavaClass(right));
}
/** Implements binary numeric promotion as defined in JLS extended by
* wrapper classes, BigDecimal and BigInteger. */
public Object extendedBinaryNumericPromotion(Object left, Object right) {
if ((left == null) || (right == null) ||
!isNumericType(left) || !isNumericType(right)) {
return null;
}
// handle BigDecimal
if (isBigDecimalType(left) || isBigDecimalType(right)) {
return getBigDecimalType();
}
// handle BigInteger
if (isBigIntegerType(left)) {
return isFloatingPointType(right) ? right : getBigIntegerType();
}
if (isBigIntegerType(right)) {
return isFloatingPointType(left) ? left : getBigIntegerType();
}
// check wrapper classes
boolean wrapper = false;
if (isWrapperClass(left)) {
wrapper = true;
left = getPrimitiveType(left);
}
if (isWrapperClass(right)) {
wrapper = true;
right = getPrimitiveType(right);
}
Object promoted = binaryNumericPromotion(left, right);
if (wrapper && promoted != null) {
promoted = getWrapperClass(promoted);
}
return promoted;
}
// Helper methods
/** Returns the primitive for the specified wrapper class. */
protected Object getPrimitiveType(Object wrapper) {
return wrapperToPrimitive.get(wrapper);
}
/** Returns the wrapper class for the specified primitive. */
protected Object getWrapperClass(Object primitive) {
return primitiveToWrapper.get(primitive);
}
/** Implements binary numeric promotion as defined in JLS. */
protected Object binaryNumericPromotion(Object left, Object right) {
if ((left == null) || (right == null)) {
return null;
}
Object type = null;
if (left == getDoubleType() || right == getDoubleType()) {
type = getDoubleType();
} else if (left == getFloatType() || right == getFloatType()) {
type = getFloatType();
} else if (left == getLongType() || right == getLongType()) {
type = getLongType();
} else if (isIntegralType(left) && isIntegralType(right)) {
type = getIntType();
}
return type;
}
}
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