Mercurial > jdk8-mips64-public > langtools / annotate
test/tools/javac/lambda/lambdaExecution/TBlock.java@c09b7234cded (annotated)
test/tools/javac/lambda/lambdaExecution/TBlock.java
Tue, 14 May 2013 11:11:09 -0700
- author
- rfield
- date
- Tue, 14 May 2013 11:11:09 -0700
- changeset 1752
- c09b7234cded
- parent 0
- 959103a6100f
- permissions
- -rw-r--r--
8012556: Implement lambda methods on interfaces as static
8006140: Javac NPE compiling Lambda expression on initialization expression of static field in interface
Summary: Lambdas occurring in static contexts or those not needing instance information should be generated into static methods. This has long been the case for classes. However, as a work-around to the lack of support for statics on interfaces, interface lambda methods have been generated into default methods. For lambdas in interface static contexts (fields and static methods) this causes an NPE in javac because there is no 'this'. MethodHandles now support static methods on interfaces. This changeset allows lambda methods to be generated as static interface methods. An existing bug in Hotspot (8013875) is exposed in a test when the "-esa" flag is used. This test and another test that already exposed this bug have been marked with @ignore.
Reviewed-by: mcimadamore
| aoqi@0 | 1 | /** |
| aoqi@0 | 2 | * Performs operations upon an input object which may modify that object and/or |
| aoqi@0 | 3 | * external state (other objects). |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * <p>All block implementations are expected to: |
| aoqi@0 | 6 | * <ul> |
| aoqi@0 | 7 | * <li>When used for aggregate operations upon many elements blocks |
| aoqi@0 | 8 | * should not assume that the {@code apply} operation will be called upon |
| aoqi@0 | 9 | * elements in any specific order.</li> |
| aoqi@0 | 10 | * </ul> |
| aoqi@0 | 11 | * |
| aoqi@0 | 12 | * @param <T> The type of input objects to {@code apply}. |
| aoqi@0 | 13 | */ |
| aoqi@0 | 14 | public interface TBlock<T> { |
| aoqi@0 | 15 | |
| aoqi@0 | 16 | /** |
| aoqi@0 | 17 | * Performs operations upon the provided object which may modify that object |
| aoqi@0 | 18 | * and/or external state. |
| aoqi@0 | 19 | * |
| aoqi@0 | 20 | * @param t an input object |
| aoqi@0 | 21 | */ |
| aoqi@0 | 22 | void apply(T t); |
| aoqi@0 | 23 | |
| aoqi@0 | 24 | /** |
| aoqi@0 | 25 | * Returns a Block which performs in sequence the {@code apply} methods of |
| aoqi@0 | 26 | * multiple Blocks. This Block's {@code apply} method is performed followed |
| aoqi@0 | 27 | * by the {@code apply} method of the specified Block operation. |
| aoqi@0 | 28 | * |
| aoqi@0 | 29 | * @param other an additional Block which will be chained after this Block |
| aoqi@0 | 30 | * @return a Block which performs in sequence the {@code apply} method of |
| aoqi@0 | 31 | * this Block and the {@code apply} method of the specified Block operation |
| aoqi@0 | 32 | */ |
| aoqi@0 | 33 | public default TBlock<T> chain(TBlock<? super T> other) { |
| aoqi@0 | 34 | return (T t) -> { apply(t); other.apply(t); }; |
| aoqi@0 | 35 | } |
| aoqi@0 | 36 | } |
