org.antlr.v4.runtime.misc

Class ObjectEqualityComparator

java.lang.Object

org.antlr.v4.runtime.misc.AbstractEqualityComparator<Object>

org.antlr.v4.runtime.misc.ObjectEqualityComparator

All Implemented Interfaces:

EqualityComparator<Object>

public final class ObjectEqualityComparator
extends AbstractEqualityComparator<Object>

This default implementation of EqualityComparator uses object equality for comparisons by calling Object.hashCode() and Object.equals(java.lang.Object).

Author:

Sam Harwell

Field Summary

Fields

Modifier and Type	Field and Description
static ObjectEqualityComparator	INSTANCE

Constructor Summary

Constructors

Constructor and Description
ObjectEqualityComparator()

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object a, Object b) This method tests if two objects are equal.
int	hashCode(Object obj) This method returns a hash code for the specified object.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final ObjectEqualityComparator INSTANCE

Constructor Detail

ObjectEqualityComparator

public ObjectEqualityComparator()

Method Detail

hashCode

public int hashCode(Object obj)

This method returns a hash code for the specified object.

This implementation returns obj.hashCode().

Parameters:

obj - The object.

Returns:

The hash code for obj.

equals

public boolean equals(Object a,
                      Object b)

This method tests if two objects are equal.

This implementation relies on object equality. If both objects are null, this method returns true. Otherwise if only a is null, this method returns false. Otherwise, this method returns the result of a.equals(b).

Parameters:

a - The first object to compare.

b - The second object to compare.

Returns:

true if a equals b, otherwise false.