75 lines
1.3 KiB
Java
75 lines
1.3 KiB
Java
/**
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*
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*/
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package org.gcube.portlets.user.speciesdiscovery.server.stream;
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import java.io.IOException;
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import org.apache.log4j.Logger;
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/**
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* Utility class for convert an input into a different kind of output.
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* @author "Federico De Faveri defaveri@isti.cnr.it"
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*
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*/
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public class ConversionIterator<I,O> implements CloseableIterator<O> {
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protected Logger logger = Logger.getLogger(ConversionIterator.class);
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protected CloseableIterator<I> source;
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protected Converter<I, O> converter;
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public ConversionIterator( CloseableIterator<I> source, Converter<I, O> converter) {
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this.source = source;
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this.converter = converter;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean hasNext() {
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return source.hasNext();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public O next() {
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assert hasNext();
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try {
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I input = source.next();
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////Another check
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if(input==null){
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logger.warn("Skipping conversion source.next() is Null!!");
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return null;
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}
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O output = converter.convert(input);
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return output;
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} catch (Exception e) {
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logger.error("Error converting element", e);
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}
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return null;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void close() throws IOException {
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source.close();
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void remove() {}
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}
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