79 lines
2.6 KiB
Java
79 lines
2.6 KiB
Java
/**
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* Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
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*/
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package akka.japi.pf;
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import scala.MatchError;
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import scala.PartialFunction;
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import scala.runtime.BoxedUnit;
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/**
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* Version of {@link scala.PartialFunction} that can be built during
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* runtime from Java.
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* This is a specialized version of {@link UnitMatch} to map java
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* void methods to {@link scala.runtime.BoxedUnit}.
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*
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* @param <I> the input type, that this PartialFunction will be applied to
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*/
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public class UnitMatch<I> extends AbstractMatch<I, BoxedUnit> {
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/**
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* Convenience function to create a {@link UnitPFBuilder} with the first
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* case statement added.
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*
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* @param type a type to match the argument against
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* @param apply an action to apply to the argument if the type matches
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* @return a builder with the case statement added
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* @see UnitPFBuilder#match(Class, FI.UnitApply)
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*/
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public static final <F, P> UnitPFBuilder<F> match(final Class<P> type, FI.UnitApply<P> apply) {
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return new UnitPFBuilder<F>().match(type, apply);
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}
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/**
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* Convenience function to create a {@link UnitPFBuilder} with the first
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* case statement added.
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*
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* @param type a type to match the argument against
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* @param predicate a predicate that will be evaluated on the argument if the type matches
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* @param apply an action to apply to the argument if the type and predicate matches
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* @return a builder with the case statement added
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* @see UnitPFBuilder#match(Class, FI.TypedPredicate, FI.UnitApply)
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*/
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public static <F, P> UnitPFBuilder<F> match(final Class<P> type,
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final FI.TypedPredicate<P> predicate,
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final FI.UnitApply<P> apply) {
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return new UnitPFBuilder<F>().match(type, predicate, apply);
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}
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/**
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* Create a {@link UnitMatch} from the builder.
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*
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* @param builder a builder representing the partial function
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* @return a {@link UnitMatch} that can be reused
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*/
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public static <F> UnitMatch<F> create(UnitPFBuilder<F> builder) {
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return new UnitMatch<F>(builder.build());
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}
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private UnitMatch(PartialFunction<I, BoxedUnit> statements) {
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super(statements);
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}
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/**
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* Convenience function to make the Java code more readable.
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*
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* <pre><code>
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* UnitMatcher<X> matcher = UnitMatcher.create(...);
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*
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* matcher.match(obj);
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* </code></pre>
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*
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* @param i the argument to apply the match to
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* @throws scala.MatchError if there is no match
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*/
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public void match(I i) throws MatchError {
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statements.apply(i);
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}
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}
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