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/**
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* Copyright (C) 2009 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.io.stream;
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import java.util.Set;
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import org.apache.log4j.Logger;
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import eu.etaxonomy.cdm.io.common.events.IIoObserver;
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import eu.etaxonomy.cdm.io.stream.terms.TermUri;
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/**
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* FilteredReader filters a stream. Only a sub-stream of the input items
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* is in the output stream.
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* @author a.mueller
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\* @since 23.11.2011
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*
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*/
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public class FilteredStream implements IItemStream {
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@SuppressWarnings("unused")
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private static Logger logger = Logger.getLogger(FilteredStream.class);
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private final IItemStream reader;
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private final ItemFilter<StreamItem> filter;
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private StreamItem next;
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/**
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* @param list
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*/
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public FilteredStream(IItemStream reader, ItemFilter<StreamItem> filter) {
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this.reader = reader;
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this.filter = filter;
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}
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@Override
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public StreamItem read() {
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StreamItem result;
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if (hasNext()){
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result = next;
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next = null;
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}else{
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result = null;
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}
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return result;
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}
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@Override
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public boolean hasNext(){
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if (next != null){
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return true;
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}
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while (reader.hasNext()){
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next = reader.read();
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if (filter == null || ! filter.toBeRemovedFromStream(next)){
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return true;
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}
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}
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next = null;
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return false;
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}
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@Override
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public TermUri getTerm() {
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return reader.getTerm();
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}
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@Override
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public String getItemLocation() {
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return reader.getItemLocation();
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}
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@Override
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public String getStreamLocation() {
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return reader.getStreamLocation();
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}
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@Override
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public void addObservers(Set<IIoObserver> observers) {
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reader.addObservers(observers);
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}
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}
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