44 lines
1.1 KiB
Java
44 lines
1.1 KiB
Java
package org.gcube.data.streams.delegates;
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import org.gcube.data.streams.Stream;
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import org.gcube.data.streams.generators.Generator;
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/**
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* A {@link Stream} of elements generated by the elements of an input {@link Stream}
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*
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* @author Fabio Simeoni
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*
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* @param <E1> the type of elements of the input stream
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* @param <E2> the type of stream elements
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*/
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public class PipedStream<E1,E2> extends AbstractDelegateStream<E1, E2> {
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private final Generator<E1, E2> generator;
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/**
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* Creates an instance with a {@link Stream} and an element {@link Generator}.
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* @param stream the stream
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* @param generator the generator
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* @throws IllegalArgumentException if the stream or the generator are <code>null</code>
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*/
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public PipedStream(Stream<E1> stream,Generator<E1, E2> generator) throws IllegalArgumentException {
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super(stream);
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if (generator == null)
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throw new IllegalArgumentException("invalid null generator");
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this.generator=generator;
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}
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@Override
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protected E2 delegateNext() {
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return generator.yield(stream().next());
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}
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@Override
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protected boolean delegateHasNext() {
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return stream().hasNext();
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}
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}
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