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Lucene example source code file (TestPayloads.java)

This example Lucene source code file (TestPayloads.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

document, document, exception, exception, indexwriter, io, payload, payload, payloadanalyzer, payloaddata, string, term, this, this, util, wrong

The Lucene TestPayloads.java source code

package org.apache.lucene.index;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.MockTokenizer;
import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.WhitespaceTokenizer;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.UnicodeUtil;
import org.apache.lucene.util._TestUtil;


public class TestPayloads extends LuceneTestCase {
    
    // Simple tests to test the Payload class
    public void testPayload() throws Exception {
        byte[] testData = "This is a test!".getBytes();
        Payload payload = new Payload(testData);
        assertEquals("Wrong payload length.", testData.length, payload.length());
        
        // test copyTo()
        byte[] target = new byte[testData.length - 1];
        try {
            payload.copyTo(target, 0);
            fail("Expected exception not thrown");
        } catch (Exception expected) {
            // expected exception
        }
        
        target = new byte[testData.length + 3];
        payload.copyTo(target, 3);
        
        for (int i = 0; i < testData.length; i++) {
            assertEquals(testData[i], target[i + 3]);
        }
        

        // test toByteArray()
        target = payload.toByteArray();
        assertByteArrayEquals(testData, target);

        // test byteAt()
        for (int i = 0; i < testData.length; i++) {
            assertEquals(payload.byteAt(i), testData[i]);
        }
        
        try {
            payload.byteAt(testData.length + 1);
            fail("Expected exception not thrown");
        } catch (Exception expected) {
            // expected exception
        }
        
        Payload clone = (Payload) payload.clone();
        assertEquals(payload.length(), clone.length());
        for (int i = 0; i < payload.length(); i++) {
          assertEquals(payload.byteAt(i), clone.byteAt(i));
        }
        
    }

    // Tests whether the DocumentWriter and SegmentMerger correctly enable the
    // payload bit in the FieldInfo
    public void testPayloadFieldBit() throws Exception {
        Directory ram = newDirectory();
        PayloadAnalyzer analyzer = new PayloadAnalyzer();
        IndexWriter writer = new IndexWriter(ram, newIndexWriterConfig( TEST_VERSION_CURRENT, analyzer));
        Document d = new Document();
        // this field won't have any payloads
        d.add(newField("f1", "This field has no payloads", Field.Store.NO, Field.Index.ANALYZED));
        // this field will have payloads in all docs, however not for all term positions,
        // so this field is used to check if the DocumentWriter correctly enables the payloads bit
        // even if only some term positions have payloads
        d.add(newField("f2", "This field has payloads in all docs", Field.Store.NO, Field.Index.ANALYZED));
        d.add(newField("f2", "This field has payloads in all docs", Field.Store.NO, Field.Index.ANALYZED));
        // this field is used to verify if the SegmentMerger enables payloads for a field if it has payloads 
        // enabled in only some documents
        d.add(newField("f3", "This field has payloads in some docs", Field.Store.NO, Field.Index.ANALYZED));
        // only add payload data for field f2
        analyzer.setPayloadData("f2", 1, "somedata".getBytes(), 0, 1);
        writer.addDocument(d);
        // flush
        writer.close();        
        
        SegmentReader reader = SegmentReader.getOnlySegmentReader(ram);
        FieldInfos fi = reader.fieldInfos();
        assertFalse("Payload field bit should not be set.", fi.fieldInfo("f1").storePayloads);
        assertTrue("Payload field bit should be set.", fi.fieldInfo("f2").storePayloads);
        assertFalse("Payload field bit should not be set.", fi.fieldInfo("f3").storePayloads);
        reader.close();
        
        // now we add another document which has payloads for field f3 and verify if the SegmentMerger
        // enabled payloads for that field
        writer = new IndexWriter(ram, newIndexWriterConfig( TEST_VERSION_CURRENT,
            analyzer).setOpenMode(OpenMode.CREATE));
        d = new Document();
        d.add(newField("f1", "This field has no payloads", Field.Store.NO, Field.Index.ANALYZED));
        d.add(newField("f2", "This field has payloads in all docs", Field.Store.NO, Field.Index.ANALYZED));
        d.add(newField("f2", "This field has payloads in all docs", Field.Store.NO, Field.Index.ANALYZED));
        d.add(newField("f3", "This field has payloads in some docs", Field.Store.NO, Field.Index.ANALYZED));
        // add payload data for field f2 and f3
        analyzer.setPayloadData("f2", "somedata".getBytes(), 0, 1);
        analyzer.setPayloadData("f3", "somedata".getBytes(), 0, 3);
        writer.addDocument(d);
        // force merge
        writer.optimize();
        // flush
        writer.close();

        reader = SegmentReader.getOnlySegmentReader(ram);
        fi = reader.fieldInfos();
        assertFalse("Payload field bit should not be set.", fi.fieldInfo("f1").storePayloads);
        assertTrue("Payload field bit should be set.", fi.fieldInfo("f2").storePayloads);
        assertTrue("Payload field bit should be set.", fi.fieldInfo("f3").storePayloads);
        reader.close();        
        ram.close();
    }

    // Tests if payloads are correctly stored and loaded using both RamDirectory and FSDirectory
    public void testPayloadsEncoding() throws Exception {
        // first perform the test using a RAMDirectory
        Directory dir = newDirectory();
        performTest(dir);
        dir.close();
        // now use a FSDirectory and repeat same test
        File dirName = _TestUtil.getTempDir("test_payloads");
        dir = newFSDirectory(dirName);
        performTest(dir);
       _TestUtil.rmDir(dirName);
        dir.close();
    }
    
    // builds an index with payloads in the given Directory and performs
    // different tests to verify the payload encoding
    private void performTest(Directory dir) throws Exception {
        PayloadAnalyzer analyzer = new PayloadAnalyzer();
        IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
            TEST_VERSION_CURRENT, analyzer)
            .setOpenMode(OpenMode.CREATE)
            .setMergePolicy(newLogMergePolicy()));
        
        // should be in sync with value in TermInfosWriter
        final int skipInterval = 16;
        
        final int numTerms = 5;
        final String fieldName = "f1";
        
        int numDocs = skipInterval + 1; 
        // create content for the test documents with just a few terms
        Term[] terms = generateTerms(fieldName, numTerms);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < terms.length; i++) {
            sb.append(terms[i].text);
            sb.append(" ");
        }
        String content = sb.toString();
        
        
        int payloadDataLength = numTerms * numDocs * 2 + numTerms * numDocs * (numDocs - 1) / 2;
        byte[] payloadData = generateRandomData(payloadDataLength);
        
        Document d = new Document();
        d.add(newField(fieldName, content, Field.Store.NO, Field.Index.ANALYZED));
        // add the same document multiple times to have the same payload lengths for all
        // occurrences within two consecutive skip intervals
        int offset = 0;
        for (int i = 0; i < 2 * numDocs; i++) {
            analyzer.setPayloadData(fieldName, payloadData, offset, 1);
            offset += numTerms;
            writer.addDocument(d);
        }
        
        // make sure we create more than one segment to test merging
        writer.commit();
        
        // now we make sure to have different payload lengths next at the next skip point        
        for (int i = 0; i < numDocs; i++) {
            analyzer.setPayloadData(fieldName, payloadData, offset, i);
            offset += i * numTerms;
            writer.addDocument(d);
        }
        
        writer.optimize();
        // flush
        writer.close();
        
        
        /*
         * Verify the index
         * first we test if all payloads are stored correctly
         */        
        IndexReader reader = IndexReader.open(dir, true);
        
        byte[] verifyPayloadData = new byte[payloadDataLength];
        offset = 0;
        TermPositions[] tps = new TermPositions[numTerms];
        for (int i = 0; i < numTerms; i++) {
            tps[i] = reader.termPositions(terms[i]);
        }
        
        while (tps[0].next()) {
            for (int i = 1; i < numTerms; i++) {
                tps[i].next();
            }
            int freq = tps[0].freq();

            for (int i = 0; i < freq; i++) {
                for (int j = 0; j < numTerms; j++) {
                    tps[j].nextPosition();
                    if (tps[j].isPayloadAvailable()) {
                      tps[j].getPayload(verifyPayloadData, offset);
                      offset += tps[j].getPayloadLength();
                    }
                }
            }
        }
        
        for (int i = 0; i < numTerms; i++) {
            tps[i].close();
        }
        
        assertByteArrayEquals(payloadData, verifyPayloadData);
        
        /*
         *  test lazy skipping
         */        
        TermPositions tp = reader.termPositions(terms[0]);
        tp.next();
        tp.nextPosition();
        // now we don't read this payload
        tp.nextPosition();
        assertEquals("Wrong payload length.", 1, tp.getPayloadLength());
        byte[] payload = tp.getPayload(null, 0);
        assertEquals(payload[0], payloadData[numTerms]);
        tp.nextPosition();
        
        // we don't read this payload and skip to a different document
        tp.skipTo(5);
        tp.nextPosition();
        assertEquals("Wrong payload length.", 1, tp.getPayloadLength());
        payload = tp.getPayload(null, 0);
        assertEquals(payload[0], payloadData[5 * numTerms]);
                
        
        /*
         * Test different lengths at skip points
         */
        tp.seek(terms[1]);
        tp.next();
        tp.nextPosition();
        assertEquals("Wrong payload length.", 1, tp.getPayloadLength());
        tp.skipTo(skipInterval - 1);
        tp.nextPosition();
        assertEquals("Wrong payload length.", 1, tp.getPayloadLength());
        tp.skipTo(2 * skipInterval - 1);
        tp.nextPosition();
        assertEquals("Wrong payload length.", 1, tp.getPayloadLength());
        tp.skipTo(3 * skipInterval - 1);
        tp.nextPosition();
        assertEquals("Wrong payload length.", 3 * skipInterval - 2 * numDocs - 1, tp.getPayloadLength());
        
        /*
         * Test multiple call of getPayload()
         */
        tp.getPayload(null, 0);
        try {
            // it is forbidden to call getPayload() more than once
            // without calling nextPosition()
            tp.getPayload(null, 0);
            fail("Expected exception not thrown");
        } catch (Exception expected) {
            // expected exception
        }
        
        reader.close();
        
        // test long payload
        analyzer = new PayloadAnalyzer();
        writer = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT,
            analyzer).setOpenMode(OpenMode.CREATE));
        String singleTerm = "lucene";
        
        d = new Document();
        d.add(newField(fieldName, singleTerm, Field.Store.NO, Field.Index.ANALYZED));
        // add a payload whose length is greater than the buffer size of BufferedIndexOutput
        payloadData = generateRandomData(2000);
        analyzer.setPayloadData(fieldName, payloadData, 100, 1500);
        writer.addDocument(d);

        
        writer.optimize();
        // flush
        writer.close();
        
        reader = IndexReader.open(dir, true);
        tp = reader.termPositions(new Term(fieldName, singleTerm));
        tp.next();
        tp.nextPosition();

        verifyPayloadData = new byte[tp.getPayloadLength()];
        tp.getPayload(verifyPayloadData, 0);
        byte[] portion = new byte[1500];
        System.arraycopy(payloadData, 100, portion, 0, 1500);
        
        assertByteArrayEquals(portion, verifyPayloadData);
        reader.close();
        
    }
    
    private void generateRandomData(byte[] data) {
        random.nextBytes(data);
    }

    private byte[] generateRandomData(int n) {
        byte[] data = new byte[n];
        generateRandomData(data);
        return data;
    }
    
    private Term[] generateTerms(String fieldName, int n) {
        int maxDigits = (int) (Math.log(n) / Math.log(10));
        Term[] terms = new Term[n];
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < n; i++) {
            sb.setLength(0);
            sb.append("t");
            int zeros = maxDigits - (int) (Math.log(i) / Math.log(10));
            for (int j = 0; j < zeros; j++) {
                sb.append("0");
            }
            sb.append(i);
            terms[i] = new Term(fieldName, sb.toString());
        }
        return terms;
    }


    void assertByteArrayEquals(byte[] b1, byte[] b2) {
        if (b1.length != b2.length) {
          fail("Byte arrays have different lengths: " + b1.length + ", " + b2.length);
        }
        
        for (int i = 0; i < b1.length; i++) {
          if (b1[i] != b2[i]) {
            fail("Byte arrays different at index " + i + ": " + b1[i] + ", " + b2[i]);
          }
        }
      }    
    
    
    /**
     * This Analyzer uses an WhitespaceTokenizer and PayloadFilter.
     */
    private static class PayloadAnalyzer extends Analyzer {
        Map<String,PayloadData> fieldToData = new HashMap();
        
        void setPayloadData(String field, byte[] data, int offset, int length) {
            fieldToData.put(field, new PayloadData(0, data, offset, length));
        }

        void setPayloadData(String field, int numFieldInstancesToSkip, byte[] data, int offset, int length) {
            fieldToData.put(field, new PayloadData(numFieldInstancesToSkip, data, offset, length));
        }
        
        @Override
        public TokenStream tokenStream(String fieldName, Reader reader) {
            PayloadData payload =  fieldToData.get(fieldName);
            TokenStream ts = new WhitespaceTokenizer(TEST_VERSION_CURRENT, reader);
            if (payload != null) {
                if (payload.numFieldInstancesToSkip == 0) {
                    ts = new PayloadFilter(ts, payload.data, payload.offset, payload.length);
                } else {
                    payload.numFieldInstancesToSkip--;
                }
            }
            return ts;
        }
        
        private static class PayloadData {
            byte[] data;
            int offset;
            int length;
            int numFieldInstancesToSkip;
            
            PayloadData(int skip, byte[] data, int offset, int length) {
                numFieldInstancesToSkip = skip;
                this.data = data;
                this.offset = offset;
                this.length = length;
            }
        }
    }

    
    /**
     * This Filter adds payloads to the tokens.
     */
    private static class PayloadFilter extends TokenFilter {
        private byte[] data;
        private int length;
        private int offset;
        Payload payload = new Payload();
        PayloadAttribute payloadAtt;
        
        public PayloadFilter(TokenStream in, byte[] data, int offset, int length) {
            super(in);
            this.data = data;
            this.length = length;
            this.offset = offset;
            payloadAtt = addAttribute(PayloadAttribute.class);
        }
        
        @Override
        public boolean incrementToken() throws IOException {
            boolean hasNext = input.incrementToken();
            if (hasNext) {
                if (offset + length <= data.length) {
                    Payload p = new Payload();
                    payloadAtt.setPayload(p);
                    p.setData(data, offset, length);
                    offset += length;                
                } else {
                    payloadAtt.setPayload(null);
                }
            }
            
            return hasNext;
        }
    }
    
    public void testThreadSafety() throws Exception {
        final int numThreads = 5;
        final int numDocs = 50 * RANDOM_MULTIPLIER;
        final ByteArrayPool pool = new ByteArrayPool(numThreads, 5);
        
        Directory dir = newDirectory();
        final IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig( 
            TEST_VERSION_CURRENT, new MockAnalyzer(random)));
        final String field = "test";
        
        Thread[] ingesters = new Thread[numThreads];
        for (int i = 0; i < numThreads; i++) {
            ingesters[i] = new Thread() {
                @Override
                public void run() {
                    try {
                        for (int j = 0; j < numDocs; j++) {
                            Document d = new Document();
                            d.add(new Field(field, new PoolingPayloadTokenStream(pool)));
                            writer.addDocument(d);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                        fail(e.toString());
                    }
                }
            };
            ingesters[i].start();
        }
        
        for (int i = 0; i < numThreads; i++) {
          ingesters[i].join();
        }
        writer.close();
        IndexReader reader = IndexReader.open(dir, true);
        TermEnum terms = reader.terms();
        while (terms.next()) {
            TermPositions tp = reader.termPositions(terms.term());
            while(tp.next()) {
                int freq = tp.freq();
                for (int i = 0; i < freq; i++) {
                    tp.nextPosition();
                    assertEquals(pool.bytesToString(tp.getPayload(new byte[5], 0)), terms.term().text);
                }
            }
            tp.close();
        }
        terms.close();
        reader.close();
        dir.close();
        assertEquals(pool.size(), numThreads);
    }
    
    private class PoolingPayloadTokenStream extends TokenStream {
        private byte[] payload;
        private boolean first;
        private ByteArrayPool pool;
        private String term;

        CharTermAttribute termAtt;
        PayloadAttribute payloadAtt;
        
        PoolingPayloadTokenStream(ByteArrayPool pool) {
            this.pool = pool;
            payload = pool.get();
            generateRandomData(payload);
            term = pool.bytesToString(payload);
            first = true;
            payloadAtt = addAttribute(PayloadAttribute.class);
            termAtt = addAttribute(CharTermAttribute.class);
        }
        
        @Override
        public boolean incrementToken() throws IOException {
            if (!first) return false;
            first = false;
            clearAttributes();
            termAtt.append(term);
            payloadAtt.setPayload(new Payload(payload));
            return true;
        }
        
        @Override
        public void close() throws IOException {
            pool.release(payload);
        }
        
    }
    
    private static class ByteArrayPool {
        private List<byte[]> pool;
        
        ByteArrayPool(int capacity, int size) {
            pool = new ArrayList<byte[]>();
            for (int i = 0; i < capacity; i++) {
                pool.add(new byte[size]);
            }
        }
        
        private UnicodeUtil.UTF8Result utf8Result = new UnicodeUtil.UTF8Result();

        synchronized String bytesToString(byte[] bytes) {
            String s = new String(bytes);
            UnicodeUtil.UTF16toUTF8(s, 0, s.length(), utf8Result);
            try {
                return new String(utf8Result.result, 0, utf8Result.length, "UTF-8");
            } catch (UnsupportedEncodingException uee) {
                return null;
            }
        }
    
        synchronized byte[] get() {
            return pool.remove(0);
        }
        
        synchronized void release(byte[] b) {
            pool.add(b);
        }
        
        synchronized int size() {
            return pool.size();
        }
    }

  public void testAcrossFields() throws Exception {
    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random, dir,
                                                     new MockAnalyzer(random, MockTokenizer.WHITESPACE, true));
    Document doc = new Document();
    doc.add(new Field("hasMaybepayload", "here we go", Field.Store.YES, Field.Index.ANALYZED));
    writer.addDocument(doc);
    writer.close();

    writer = new RandomIndexWriter(random, dir,
                                   new MockAnalyzer(random, MockTokenizer.WHITESPACE, true));
    doc = new Document();
    doc.add(new Field("hasMaybepayload2", "here we go", Field.Store.YES, Field.Index.ANALYZED));
    writer.addDocument(doc);
    writer.addDocument(doc);
    writer.optimize();
    writer.close();

    _TestUtil.checkIndex(dir);

    dir.close();
  }
}

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