程序包 cn.taketoday.expression.spel.ast

类 Operator.DescriptorComparison

java.lang.Object

cn.taketoday.expression.spel.ast.Operator.DescriptorComparison

封闭类:

Operator

protected static final class Operator.DescriptorComparison
extends Object

A descriptor comparison encapsulates the result of comparing descriptor for two operands and describes at what level they are compatible.

字段概要

字段

修饰符和类型	字段	说明
final boolean	areCompatible
final boolean	areNumbers
final char	compatibleType
(专用程序包) static final Operator.DescriptorComparison	INCOMPATIBLE_NUMBERS
(专用程序包) static final Operator.DescriptorComparison	NOT_NUMBERS

构造器概要

构造器

限定符	构造器	说明
private	DescriptorComparison(boolean areNumbers, boolean areCompatible, char compatibleType)

方法概要

修饰符和类型	方法	说明
static Operator.DescriptorComparison	checkNumericCompatibility(String leftDeclaredDescriptor, String rightDeclaredDescriptor, String leftActualDescriptor, String rightActualDescriptor)	Return an object that indicates whether the input descriptors are compatible.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

NOT_NUMBERS

static final Operator.DescriptorComparison NOT_NUMBERS

INCOMPATIBLE_NUMBERS

static final Operator.DescriptorComparison INCOMPATIBLE_NUMBERS

areNumbers

public final boolean areNumbers

areCompatible

public final boolean areCompatible

compatibleType

public final char compatibleType

构造器详细资料

DescriptorComparison

private DescriptorComparison(boolean areNumbers,
 boolean areCompatible,
 char compatibleType)

方法详细资料

checkNumericCompatibility

public static Operator.DescriptorComparison checkNumericCompatibility(@Nullable
 String leftDeclaredDescriptor,
 @Nullable
 String rightDeclaredDescriptor,
 @Nullable
 String leftActualDescriptor,
 @Nullable
 String rightActualDescriptor)

Return an object that indicates whether the input descriptors are compatible.

A declared descriptor is what could statically be determined (e.g. from looking at the return value of a property accessor method) whilst an actual descriptor is the type of an actual object that was returned, which may differ.

For generic types with unbound type variables, the declared descriptor discovered may be 'Object' but from the actual descriptor it is possible to observe that the objects are really numeric values (e.g. ints).

参数:

leftDeclaredDescriptor - the statically determinable left descriptor

rightDeclaredDescriptor - the statically determinable right descriptor

leftActualDescriptor - the dynamic/runtime left object descriptor

rightActualDescriptor - the dynamic/runtime right object descriptor

返回:

a DescriptorComparison object indicating the type of compatibility, if any