org.netbeans.modules.jackpot30.backend.impl.spi.StatisticsGenerator.java Source code

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Here is the source code for org.netbeans.modules.jackpot30.backend.impl.spi.StatisticsGenerator.java

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2012 Oracle and/or its affiliates. All rights reserved.
 *
 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
 * Other names may be trademarks of their respective owners.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
 * License.  When distributing the software, include this License Header
 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the GPL Version 2 section of the License file that
 * accompanied this code. If applicable, add the following below the
 * License Header, with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 *
 * If you wish your version of this file to be governed by only the CDDL
 * or only the GPL Version 2, indicate your decision by adding
 * "[Contributor] elects to include this software in this distribution
 * under the [CDDL or GPL Version 2] license." If you do not indicate a
 * single choice of license, a recipient has the option to distribute
 * your version of this file under either the CDDL, the GPL Version 2 or
 * to extend the choice of license to its licensees as provided above.
 * However, if you add GPL Version 2 code and therefore, elected the GPL
 * Version 2 license, then the option applies only if the new code is
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 *
 * Contributor(s):
 *
 * Portions Copyrighted 2012 Sun Microsystems, Inc.
 */
package org.netbeans.modules.jackpot30.backend.impl.spi;

import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.FieldSelector;
import org.apache.lucene.document.FieldSelectorResult;
import org.apache.lucene.index.IndexReader;
import org.openide.util.Lookup;

/**
 *
 * @author lahvac
 */
public abstract class StatisticsGenerator {

    protected abstract void amendStatistics(IndexReader r, Document doc) throws IOException;

    public static Map<String, Long> generateStatistics(IndexReader r) throws IOException {
        statistics = new HashMap<String, Long>();

        Collection<? extends StatisticsGenerator> generators = Lookup.getDefault()
                .lookupAll(StatisticsGenerator.class);

        int maxDocs = r.maxDoc();

        for (int d = 0; d < maxDocs; d++) {
            Document doc = r.document(d, new FieldSelector() {
                @Override
                public FieldSelectorResult accept(String string) {
                    return FieldSelectorResult.LAZY_LOAD;
                }
            });

            for (StatisticsGenerator sg : generators) {
                sg.amendStatistics(r, doc);
            }
        }

        Map<String, Long> result = statistics;

        statistics = null;

        return result;
    }

    private static Map<String, Long> statistics;

    protected final void increment(String key) {
        add(key, 1);
    }

    protected void add(String key, long count) {
        Long val = statistics.get(key);

        if (val == null)
            val = 0L;

        statistics.put(key, val + count);
    }

}