| /*=============================================================================# |
| # Copyright (c) 2015, 2021 Stephan Wahlbrink and others. |
| # |
| # This program and the accompanying materials are made available under the |
| # terms of the Eclipse Public License 2.0 which is available at |
| # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0 |
| # which is available at https://www.apache.org/licenses/LICENSE-2.0. |
| # |
| # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 |
| # |
| # Contributors: |
| # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation |
| #=============================================================================*/ |
| |
| package org.eclipse.statet.internal.rhelp.core.index; |
| |
| import java.io.IOException; |
| import java.util.Set; |
| |
| import org.apache.lucene.index.FieldInfo; |
| import org.apache.lucene.index.LeafReader; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.index.StoredFieldVisitor; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.SimpleCollector; |
| |
| import org.eclipse.statet.jcommons.lang.NonNullByDefault; |
| |
| |
| @NonNullByDefault |
| public class DocFieldVisitorCollector extends SimpleCollector { |
| |
| |
| public abstract static class Visitor extends StoredFieldVisitor { |
| |
| |
| private final Set<String> fieldNames; |
| |
| |
| public Visitor(final Set<String> fieldNames) { |
| this.fieldNames= fieldNames; |
| } |
| |
| |
| @Override |
| public Status needsField(final FieldInfo fieldInfo) throws IOException { |
| return this.fieldNames.contains(fieldInfo.name) ? Status.YES : Status.NO; |
| } |
| |
| public void setReader(final LeafReader reader) throws IOException { |
| } |
| |
| public abstract void newDocMatch(int doc, float score) throws IOException; |
| |
| public abstract void finalizeDocMatch() throws IOException; |
| |
| } |
| |
| |
| private final Visitor visitor; |
| |
| private Scorer scorer; |
| |
| private LeafReader reader; |
| private LeafReader readerSet; |
| |
| |
| public DocFieldVisitorCollector(final Visitor visitor) { |
| this.visitor= visitor; |
| } |
| |
| |
| @Override |
| public boolean needsScores() { |
| return true; |
| } |
| |
| @Override |
| protected void doSetNextReader(final LeafReaderContext context) throws IOException { |
| this.reader= context.reader(); |
| } |
| |
| @Override |
| public void setScorer(final Scorer scorer) throws IOException { |
| this.scorer= scorer; |
| } |
| |
| @Override |
| public void collect(final int doc) throws IOException { |
| final float score= this.scorer.score(); |
| if (score > 0.0f) { |
| if (this.readerSet != this.reader) { |
| this.visitor.setReader(this.readerSet= this.reader); |
| } |
| this.visitor.newDocMatch(doc, score); |
| this.reader.document(doc, this.visitor); |
| this.visitor.finalizeDocMatch(); |
| } |
| } |
| |
| } |