Package de.isas.lipidomics.palinom

Class HandlerUtils

java.lang.Object

de.isas.lipidomics.palinom.HandlerUtils

public class HandlerUtils
extends Object

Common functions for ANTLRv4's RuleNode handling.

Author:

nils.hoffmann

Constructor Summary

Constructors

Constructor	Description
HandlerUtils()

Method Summary

Modifier and Type	Method	Description
static <T extends org.antlr.v4.runtime.tree.RuleNode> Integer	asInt(T context, Integer defaultValue)	Parse the provided context's text value as an Integer or use default value.
static <T> Optional<T>	maybe(T t)	Wrap t as an optional of nullable.
static <T,R> R	maybeMapOr(T t, Function<? super T,R> mapper, R r)	Wrap t as an optional and return r if t is null or empty.

Methods inherited from class java.lang.Object

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

Constructor Detail

HandlerUtils

public HandlerUtils()

Method Detail

asInt

public static <T extends org.antlr.v4.runtime.tree.RuleNode> Integer asInt(T context,
                                                                           Integer defaultValue)

Parse the provided context's text value as an Integer or use default value.

Type Parameters:

T - the type of the context.

Parameters:

context - the context.

defaultValue - the default value.

Returns:

the context's text value as an integer, or the default value.

maybe

public static <T> Optional<T> maybe(T t)

Wrap t as an optional of nullable.

Type Parameters:

T - the type of t.

Parameters:

t - the argument.

Returns:

an optional.

maybeMapOr

public static <T,R> R maybeMapOr(T t,
                                       Function<? super T,R> mapper,
                                       R r)

Wrap t as an optional and return r if t is null or empty.

Type Parameters:

T - the type of t.

R - the type of the return value r.

Parameters:

t - the argument to wrap.

mapper - the mapping function to get from t to r, if t is not null.

r - the default return value.

Returns:

the mapped value for t of type R, or the default value r.