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52 lines
1.3 KiB
Java
52 lines
1.3 KiB
Java
package org.gcube.data.spd.plugin.fwk.readers;
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import gr.uoa.di.madgik.grs.reader.ForwardReader;
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import gr.uoa.di.madgik.grs.reader.GRS2ReaderException;
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import gr.uoa.di.madgik.grs.record.GenericRecord;
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import gr.uoa.di.madgik.grs.record.field.StringField;
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import java.net.URI;
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import java.util.Iterator;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public abstract class RSReader<T> implements Iterator<T>{
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private static final Logger logger = LoggerFactory.getLogger(RSReader.class);
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private Iterator<GenericRecord> it;
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private ForwardReader<GenericRecord> reader;
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public RSReader(String locator) throws Exception{
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reader=new ForwardReader<GenericRecord>(new URI(locator));
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reader.setIteratorTimeout(3000);
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it =reader.iterator();
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}
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@Override
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public boolean hasNext() {
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if (it.hasNext()) return true;
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else {
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try {
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reader.close();
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} catch (GRS2ReaderException e) {
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logger.error("error closing reader",e);
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}
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return false;
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}
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}
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@Override
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public T next() {
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try {
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return transform(((StringField)it.next().getField("result")).getPayload());
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} catch (Exception e) {
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logger.error("error getting tree",e);
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return null;
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}
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}
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public abstract T transform(String serializedItem) throws Exception;
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@Override
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public void remove() {}
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}
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