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71 lines
1.8 KiB
71 lines
1.8 KiB
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.util.stream;
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/**
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* An enum describing the known shape specializations for stream abstractions.
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* Each will correspond to a specific subinterface of {@link BaseStream}
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* (e.g., {@code REFERENCE} corresponds to {@code Stream}, {@code INT_VALUE}
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* corresponds to {@code IntStream}). Each may also correspond to
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* specializations of value-handling abstractions such as {@code Spliterator},
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* {@code Consumer}, etc.
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*
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* @apiNote
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* This enum is used by implementations to determine compatibility between
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* streams and operations (i.e., if the output shape of a stream is compatible
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* with the input shape of the next operation).
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*
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* <p>Some APIs require you to specify both a generic type and a stream shape
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* for input or output elements, such as {@link TerminalOp} which has both
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* generic type parameters for its input types, and a getter for the
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* input shape. When representing primitive streams in this way, the
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* generic type parameter should correspond to the wrapper type for that
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* primitive type.
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*
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* @since 1.8
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*/
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enum StreamShape {
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/**
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* The shape specialization corresponding to {@code Stream} and elements
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* that are object references.
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*/
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REFERENCE,
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/**
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* The shape specialization corresponding to {@code IntStream} and elements
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* that are {@code int} values.
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*/
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INT_VALUE,
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/**
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* The shape specialization corresponding to {@code LongStream} and elements
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* that are {@code long} values.
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*/
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LONG_VALUE,
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/**
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* The shape specialization corresponding to {@code DoubleStream} and
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* elements that are {@code double} values.
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*/
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DOUBLE_VALUE
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}
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