it.drwolf.ridire.session.async.callable.CorpusDeleter.java Source code

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Here is the source code for it.drwolf.ridire.session.async.callable.CorpusDeleter.java

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/*******************************************************************************
 * Copyright 2013 Universit degli Studi di Firenze
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package it.drwolf.ridire.session.async.callable;

import it.drwolf.ridire.index.ContextsIndexManager;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.ArrayUtils;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.jboss.seam.Component;
import org.jboss.seam.contexts.Lifecycle;

public class CorpusDeleter extends IndexingCommand {
    private String corpusName;
    private ContextsIndexManager contextsIndexManager;
    private float percentage = 0.0f;

    public CorpusDeleter(String corpusName) {
        super();
        this.corpusName = corpusName;
    }

    public IndexingResult call() {
        IndexingResult indexingResult = new IndexingResult();
        Lifecycle.beginCall();
        try {
            this.contextsIndexManager = (ContextsIndexManager) Component.getInstance("contextsIndexManager");
            TopDocs termDocs = null;
            int updated = 0;
            int totToBeModified = 0;
            this.contextsIndexManager.reOpenIndexReaderW();
            termDocs = this.contextsIndexManager.getIndexSearcherW()
                    .search(new TermQuery(new Term("corpus", this.corpusName)), Integer.MAX_VALUE);
            totToBeModified = termDocs.totalHits;
            for (int i = 0; i < termDocs.totalHits; i += 30) {
                ScoreDoc[] tmp = (ScoreDoc[]) ArrayUtils.subarray(termDocs.scoreDocs, i, i + 30);
                for (ScoreDoc scoreDoc : tmp) {
                    this.contextsIndexManager.reOpenIndexReaderW();
                    Document d = this.contextsIndexManager.getIndexSearcherW().doc(scoreDoc.doc);
                    List<String> corporaNames = new ArrayList<String>();
                    for (String cn : d.getValues("corpus")) {
                        if (!cn.equals(this.corpusName)) {
                            corporaNames.add(cn);
                        }
                    }
                    d.removeFields("corpus");
                    if (corporaNames.size() > 0) {
                        for (String cn : corporaNames) {
                            d.add(new Field("corpus", cn, Field.Store.YES, Field.Index.NOT_ANALYZED));
                        }
                    }
                    try {
                        this.contextsIndexManager.closeIndexWriter();
                        this.contextsIndexManager.getIndexSearcherW().getIndexReader().deleteDocument(scoreDoc.doc);
                        this.contextsIndexManager.getIndexSearcherW().getIndexReader().close();
                        this.contextsIndexManager.openIndexWriterWithoutCreating();
                        this.contextsIndexManager.getIndexWriter().updateDocument(new Term("corpus"), d);
                        this.contextsIndexManager.closeIndexWriter();
                    } catch (RuntimeException e) {
                        e.printStackTrace();
                        throw e;
                    }
                    ++updated;
                    this.percentage = updated / (totToBeModified * 1.0f);
                }
            }
            this.contextsIndexManager.openIndexWriterWithoutCreating();
            this.contextsIndexManager.getIndexWriter().expungeDeletes();
            this.contextsIndexManager.closeIndexWriter();
        } catch (Exception e) {
            e.printStackTrace();
        }
        Lifecycle.endCall();
        this.setTerminated(true);
        return indexingResult;
    }

    public String getDescription() {
        return "Deleting corpus: " + this.corpusName;
    }

    public float getPercentage() {
        return this.percentage;
    }

}