com.mathworks.xzheng.admin.Fragments.java Source code

Introduction

Here is the source code for com.mathworks.xzheng.admin.Fragments.java

Source

package com.mathworks.xzheng.admin;

/**
 * Copyright Manning Publications Co.
 *
 * 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 lan      
*/

import java.util.Collection;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.index.IndexCommit;
import org.apache.lucene.index.IndexDeletionPolicy;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy;
import org.apache.lucene.index.SnapshotDeletionPolicy;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.Version;

// From chapter 11

public class Fragments {
    public void test() throws Exception {
        Directory dir = null;
        Analyzer analyzer = null;
        // START
        IndexDeletionPolicy policy = new KeepOnlyLastCommitDeletionPolicy();
        SnapshotDeletionPolicy snapshotter = new SnapshotDeletionPolicy(policy);

        IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_46, analyzer);
        config.setIndexDeletionPolicy(snapshotter);
        IndexWriter writer = new IndexWriter(dir, config);
        // END

        IndexCommit commit = null;
        try {
            commit = (IndexCommit) snapshotter.snapshot();
            Collection<String> fileNames = commit.getFileNames();
            /*<iterate over & copy files from fileNames>*/
        } finally {
            snapshotter.release(commit);
        }
    }
}