Class ObjectMethods
java.lang.Object
java.lang.runtime.ObjectMethods
Bootstrap methods for state-driven implementations of core methods,
including
Object.equals(Object)
, Object.hashCode()
, and
Object.toString()
. These methods may be used, for example, by
Java compiler implementations to implement the bodies of Object
methods for record classes.- Since:
- 16
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Method Summary
Modifier and TypeMethodDescriptionstatic Object
bootstrap
(MethodHandles.Lookup lookup, String methodName, TypeDescriptor type, Class<?> recordClass, String names, MethodHandle... getters) Bootstrap method to generate theObject.equals(Object)
,Object.hashCode()
, andObject.toString()
methods, based on a description of the component names and accessor methods, for eitherinvokedynamic
call sites or dynamic constant pool entries.
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Method Details
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bootstrap
public static Object bootstrap(MethodHandles.Lookup lookup, String methodName, TypeDescriptor type, Class<?> recordClass, String names, MethodHandle... getters) throws Throwable Bootstrap method to generate theObject.equals(Object)
,Object.hashCode()
, andObject.toString()
methods, based on a description of the component names and accessor methods, for eitherinvokedynamic
call sites or dynamic constant pool entries. For more detail on the semantics of the generated methods see the specification ofRecord.equals(Object)
,Record.hashCode()
andRecord.toString()
.- Parameters:
lookup
- Every bootstrap method is expected to have alookup
which usually represents a lookup context with the accessibility privileges of the caller. This is becauseinvokedynamic
call sites always provide alookup
to the corresponding bootstrap method, but this method just ignores thelookup
parametermethodName
- the name of the method to generate, which must be one of"equals"
,"hashCode"
, or"toString"
type
- aMethodType
corresponding the descriptor type for the method, which must correspond to the descriptor for the correspondingObject
method, if linking aninvokedynamic
call site, or the constantMethodHandle.class
, if linking a dynamic constantrecordClass
- the record class hosting the record componentsnames
- the list of component names, joined into a string separated by ";", or the empty string if there are no components. This parameter is ignored if themethodName
parameter is"equals"
or"hashCode"
getters
- method handles for the accessor methods for the components- Returns:
- a call site if invoked by indy, or a method handle if invoked by a condy
- Throws:
IllegalArgumentException
- if the bootstrap arguments are invalid or inconsistentNullPointerException
- if any argument isnull
or if any element in thegetters
array isnull
Throwable
- if any exception is thrown during call site construction
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