java.lang.Object
org.apache.wicket.util.lang.Objects
Object utilities.
- Author:
- Jonathan Locke
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Method Summary
Modifier and TypeMethodDescriptionstatic BigDecimal
bigDecValue
(Object value) Evaluates the given object as a BigDecimal.static BigInteger
bigIntValue
(Object value) Evaluates the given object as a BigInteger.static boolean
booleanValue
(Object value) Evaluates the given object as a boolean: if it is a Boolean object, it's easy; if it's a Number or a Character, returns true for non-zero objects; and otherwise returns true for non-null objects.static int
compareWithConversion
(Object v1, Object v2) Compares two objects for equality, even if it has to convert one of them to the other type.static <T> T
convertValue
(Object value, Class<T> toType) Convert between basic Java types, i.e. primitives and their wrappers, numbers and strings.static <T> T
defaultIfNull
(T originalObj, T defaultObj) Returns the original object if this one is !static double
doubleValue
(Object value) Evaluates the given object as a double-precision floating-point number.static boolean
Returns true if a and b are equal.static int
getNumericType
(int t1, int t2, boolean canBeNonNumeric) Returns the constant from the NumericTypes interface that best expresses the type of an operation, which can be either numeric or not, on the two given types.static int
getNumericType
(Object value) Returns a constant from the NumericTypes interface that represents the numeric type of the given object.static int
getNumericType
(Object v1, Object v2) Returns the constant from the NumericTypes interface that best expresses the type of a numeric operation on the two given objects.static int
getNumericType
(Object v1, Object v2, boolean canBeNonNumeric) Returns the constant from the NumericTypes interface that best expresses the type of an operation, which can be either numeric or not, on the two given objects.static int
returns hashcode of the objects by calling obj.hashcode(). safe to use when obj is null.static boolean
Returns true if object1 is equal to object2 in either the sense that they are the same object or, if both are non-null if they are equal in theequals()
sense.static long
Evaluates the given object as a long integer.static Number
newInteger
(int type, long value) Returns a new Number object of an appropriate type to hold the given integer value.static String
stringValue
(Object value) Evaluates the given object as a String.static String
stringValue
(Object value, boolean trim) Evaluates the given object as a String and trims it if the trim flag is true.
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Method Details
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bigDecValue
Evaluates the given object as a BigDecimal.- Parameters:
value
- an object to interpret as a BigDecimal- Returns:
- the BigDecimal value implied by the given object
- Throws:
NumberFormatException
- if the given object can't be understood as a BigDecimal
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bigIntValue
Evaluates the given object as a BigInteger.- Parameters:
value
- an object to interpret as a BigInteger- Returns:
- the BigInteger value implied by the given object
- Throws:
NumberFormatException
- if the given object can't be understood as a BigInteger
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booleanValue
Evaluates the given object as a boolean: if it is a Boolean object, it's easy; if it's a Number or a Character, returns true for non-zero objects; and otherwise returns true for non-null objects.- Parameters:
value
- an object to interpret as a boolean- Returns:
- the boolean value implied by the given object
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compareWithConversion
Compares two objects for equality, even if it has to convert one of them to the other type. If both objects are numeric they are converted to the widest type and compared. If one is non-numeric and one is numeric the non-numeric is converted to double and compared to the double numeric value. If both are non-numeric and Comparable and the types are compatible (i.e. v1 is of the same or superclass of v2's type) they are compared with Comparable.compareTo(). If both values are non-numeric and not Comparable or of incompatible classes this will throw and IllegalArgumentException.- Parameters:
v1
- First value to comparev2
- second value to compare- Returns:
- integer describing the comparison between the two objects. A negative number indicates that v1 < v2. Positive indicates that v1 > v2. Zero indicates v1 == v2.
- Throws:
IllegalArgumentException
- if the objects are both non-numeric yet of incompatible types or do not implement Comparable.
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convertValue
Convert between basic Java types, i.e. primitives and their wrappers, numbers and strings.This method also detects when arrays are being converted and converts the components of one array to the type of the other.
- Type Parameters:
T
- target type- Parameters:
value
- an object to be converted to the given typetoType
- class type to be converted to- Returns:
- converted value of the type given, or null if the value cannot be converted to the given type.
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doubleValue
Evaluates the given object as a double-precision floating-point number.- Parameters:
value
- an object to interpret as a double- Returns:
- the double value implied by the given object
- Throws:
NumberFormatException
- if the given object can't be understood as a double
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equal
Returns true if a and b are equal. Either object may be null.- Parameters:
a
- Object ab
- Object b- Returns:
- True if the objects are equal
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getNumericType
Returns the constant from the NumericTypes interface that best expresses the type of an operation, which can be either numeric or not, on the two given types.- Parameters:
t1
- type of one argument to an operatort2
- type of the other argumentcanBeNonNumeric
- whether the operator can be interpreted as non-numeric- Returns:
- the appropriate constant from the NumericTypes interface
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getNumericType
Returns a constant from the NumericTypes interface that represents the numeric type of the given object.- Parameters:
value
- an object that needs to be interpreted as a number- Returns:
- the appropriate constant from the NumericTypes interface
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getNumericType
Returns the constant from the NumericTypes interface that best expresses the type of a numeric operation on the two given objects.- Parameters:
v1
- one argument to a numeric operatorv2
- the other argument- Returns:
- the appropriate constant from the NumericTypes interface
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getNumericType
Returns the constant from the NumericTypes interface that best expresses the type of an operation, which can be either numeric or not, on the two given objects.- Parameters:
v1
- one argument to an operatorv2
- the other argumentcanBeNonNumeric
- whether the operator can be interpreted as non-numeric- Returns:
- the appropriate constant from the NumericTypes interface
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isEqual
Returns true if object1 is equal to object2 in either the sense that they are the same object or, if both are non-null if they are equal in theequals()
sense.- Parameters:
object1
- First object to compareobject2
- Second object to compare- Returns:
- true if v1 == v2
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longValue
Evaluates the given object as a long integer.- Parameters:
value
- an object to interpret as a long integer- Returns:
- the long integer value implied by the given object
- Throws:
NumberFormatException
- if the given object can't be understood as a long integer
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newInteger
Returns a new Number object of an appropriate type to hold the given integer value. The type of the returned object is consistent with the given type argument, which is a constant from the NumericTypes interface.- Parameters:
type
- the nominal numeric type of the result, a constant from the NumericTypes interfacevalue
- the integer value to convert to a Number object- Returns:
- a Number object with the given value, of type implied by the type argument
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stringValue
Evaluates the given object as a String.- Parameters:
value
- an object to interpret as a String- Returns:
- the String value implied by the given object as returned by the toString() method, or "null" if the object is null.
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hashCode
returns hashcode of the objects by calling obj.hashcode(). safe to use when obj is null.- Parameters:
obj
-- Returns:
- hashcode of the object or 0 if obj is null
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stringValue
Evaluates the given object as a String and trims it if the trim flag is true.- Parameters:
value
- an object to interpret as a Stringtrim
- whether to trim the string- Returns:
- the String value implied by the given object as returned by the toString() method, or "null" if the object is null.
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defaultIfNull
Returns the original object if this one is != null. If the original object is null the default one is returned. The default object has no restriction, it might be itself null.- Parameters:
originalObj
- the original objectdefaultObj
- the default object- Returns:
- the original object if not null, the default one otherwise.
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