+act #3770 Added Java 8 friendly APIs for Actor and FSM

akka-actor/src/main/java/akka/japi/pf/UnitPFBuilder.java

@@ -0,0 +1,85 @@
+/**
+ * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package akka.japi.pf;
+
+import scala.runtime.BoxedUnit;
+
+/**
+ * A builder for {@link scala.PartialFunction}.
+ * This is a specialized version of {@link PFBuilder} to map java
+ * void methods to {@link scala.runtime.BoxedUnit}.
+ *
+ * @param <I> the input type, that this PartialFunction to be applied to
+ */
+public final class UnitPFBuilder<I> extends AbstractPFBuilder<I, BoxedUnit> {
+
+  /**
+   * Create a UnitPFBuilder.
+   */
+  public UnitPFBuilder() {
+  }
+
+  /**
+   * Add a new case statement to this builder.
+   *
+   * @param type   a type to match the argument against
+   * @param apply  an action to apply to the argument if the type matches
+   * @return       a builder with the case statement added
+   */
+  public <P> UnitPFBuilder<I> match(final Class<P> type,
+                                    final FI.UnitApply<P> apply) {
+    addStatement(new UnitCaseStatement<I, P>(
+      new FI.Predicate() {
+        @Override
+        public boolean defined(Object o) {
+          return type.isInstance(o);
+        }
+      }, apply));
+    return this;
+  }
+
+  /**
+   * Add a new case statement to this builder.
+   *
+   * @param type       a type to match the argument against
+   * @param predicate  a predicate that will be evaluated on the argument if the type matches
+   * @param apply      an action to apply to the argument if the type matches and the predicate returns true
+   * @return           a builder with the case statement added
+   */
+  public <P> UnitPFBuilder<I> match(final Class<P> type,
+                                    final FI.TypedPredicate<P> predicate,
+                                    final FI.UnitApply<P> apply) {
+    addStatement(new UnitCaseStatement<I, P>(
+      new FI.Predicate() {
+        @Override
+        public boolean defined(Object o) {
+          if (!type.isInstance(o))
+            return false;
+          else {
+            @SuppressWarnings("unchecked")
+            P p = (P) o;
+            return predicate.defined(p);
+          }
+        }
+      }, apply));
+    return this;
+  }
+
+  /**
+   * Add a new case statement to this builder, that matches any argument.
+   * @param apply  an action to apply to the argument
+   * @return       a builder with the case statement added
+   */
+  public UnitPFBuilder<I> matchAny(final FI.UnitApply<Object> apply) {
+    addStatement(new UnitCaseStatement<I, Object>(
+      new FI.Predicate() {
+        @Override
+        public boolean defined(Object o) {
+          return true;
+        }
+      }, apply));
+    return this;
+  }
+}