63 lines
1.1 KiB
Java
63 lines
1.1 KiB
Java
package org.gcube.data.streams;
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import org.gcube.data.streams.exceptions.StreamSkipSignal;
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import org.gcube.data.streams.exceptions.StreamStopSignal;
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/**
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* A generic {@link Stream} consumer that delegates element processing and failure handling to a {@link Callback}.
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* @author Fabio Simeoni
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*
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* @param <T> the type of stream elements
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*/
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public final class StreamConsumer<T> {
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private final Stream<T> stream;
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private final Callback<T> callback;
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/**
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* Creates an instance with a {@link Stream} and a {@link Callback}
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* @param stream the stream
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* @param callback the callback
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*/
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public StreamConsumer(Stream<T> stream, Callback<T> callback) {
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this.stream=stream;
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this.callback=callback;
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}
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/**
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* Starts the iteration.
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*/
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public void start() {
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consume();
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}
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//helper
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private void consume() {
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try {
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consuming: while (stream.hasNext()) {
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T next = stream.next();
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try {
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callback.consume(next);
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}
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catch(StreamSkipSignal skip) {
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continue consuming;
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}
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catch(StreamStopSignal stop) {
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break consuming;
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}
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}
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}
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finally {
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stream.close();
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}
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}
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}
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