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Apache Lucene (module: codecs)
package org.apache.lucene.codecs.simpletext;
/*
* 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.IOException;
import java.math.BigInteger;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Locale;
import java.util.Set;
import org.apache.lucene.codecs.DocValuesConsumer;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.index.SegmentWriteState;
import org.apache.lucene.index.FieldInfo.DocValuesType;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IOUtils;
class SimpleTextDocValuesWriter extends DocValuesConsumer {
final static BytesRef END = new BytesRef("END");
final static BytesRef FIELD = new BytesRef("field ");
final static BytesRef TYPE = new BytesRef(" type ");
// used for numerics
final static BytesRef MINVALUE = new BytesRef(" minvalue ");
final static BytesRef PATTERN = new BytesRef(" pattern ");
// used for bytes
final static BytesRef LENGTH = new BytesRef("length ");
final static BytesRef MAXLENGTH = new BytesRef(" maxlength ");
// used for sorted bytes
final static BytesRef NUMVALUES = new BytesRef(" numvalues ");
final static BytesRef ORDPATTERN = new BytesRef(" ordpattern ");
final IndexOutput data;
final BytesRef scratch = new BytesRef();
final int numDocs;
private final Set fieldsSeen = new HashSet(); // for asserting
public SimpleTextDocValuesWriter(SegmentWriteState state, String ext) throws IOException {
// System.out.println("WRITE: " + IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, ext) + " " + state.segmentInfo.getDocCount() + " docs");
data = state.directory.createOutput(IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, ext), state.context);
numDocs = state.segmentInfo.getDocCount();
}
// for asserting
private boolean fieldSeen(String field) {
assert !fieldsSeen.contains(field): "field \"" + field + "\" was added more than once during flush";
fieldsSeen.add(field);
return true;
}
@Override
public void addNumericField(FieldInfo field, Iterable values) throws IOException {
assert fieldSeen(field.name);
assert (field.getDocValuesType() == FieldInfo.DocValuesType.NUMERIC ||
field.getNormType() == FieldInfo.DocValuesType.NUMERIC);
writeFieldEntry(field, FieldInfo.DocValuesType.NUMERIC);
// first pass to find min/max
long minValue = Long.MAX_VALUE;
long maxValue = Long.MIN_VALUE;
for(Number n : values) {
long v = n == null ? 0 : n.longValue();
minValue = Math.min(minValue, v);
maxValue = Math.max(maxValue, v);
}
// write our minimum value to the .dat, all entries are deltas from that
SimpleTextUtil.write(data, MINVALUE);
SimpleTextUtil.write(data, Long.toString(minValue), scratch);
SimpleTextUtil.writeNewline(data);
// build up our fixed-width "simple text packed ints"
// format
BigInteger maxBig = BigInteger.valueOf(maxValue);
BigInteger minBig = BigInteger.valueOf(minValue);
BigInteger diffBig = maxBig.subtract(minBig);
int maxBytesPerValue = diffBig.toString().length();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < maxBytesPerValue; i++) {
sb.append('0');
}
// write our pattern to the .dat
SimpleTextUtil.write(data, PATTERN);
SimpleTextUtil.write(data, sb.toString(), scratch);
SimpleTextUtil.writeNewline(data);
final String patternString = sb.toString();
final DecimalFormat encoder = new DecimalFormat(patternString, new DecimalFormatSymbols(Locale.ROOT));
int numDocsWritten = 0;
// second pass to write the values
for(Number n : values) {
long value = n == null ? 0 : n.longValue();
assert value >= minValue;
Number delta = BigInteger.valueOf(value).subtract(BigInteger.valueOf(minValue));
String s = encoder.format(delta);
assert s.length() == patternString.length();
SimpleTextUtil.write(data, s, scratch);
SimpleTextUtil.writeNewline(data);
if (n == null) {
SimpleTextUtil.write(data, "F", scratch);
} else {
SimpleTextUtil.write(data, "T", scratch);
}
SimpleTextUtil.writeNewline(data);
numDocsWritten++;
assert numDocsWritten <= numDocs;
}
assert numDocs == numDocsWritten: "numDocs=" + numDocs + " numDocsWritten=" + numDocsWritten;
}
@Override
public void addBinaryField(FieldInfo field, Iterable values) throws IOException {
assert fieldSeen(field.name);
assert field.getDocValuesType() == DocValuesType.BINARY;
int maxLength = 0;
for(BytesRef value : values) {
final int length = value == null ? 0 : value.length;
maxLength = Math.max(maxLength, length);
}
writeFieldEntry(field, FieldInfo.DocValuesType.BINARY);
// write maxLength
SimpleTextUtil.write(data, MAXLENGTH);
SimpleTextUtil.write(data, Integer.toString(maxLength), scratch);
SimpleTextUtil.writeNewline(data);
int maxBytesLength = Long.toString(maxLength).length();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < maxBytesLength; i++) {
sb.append('0');
}
// write our pattern for encoding lengths
SimpleTextUtil.write(data, PATTERN);
SimpleTextUtil.write(data, sb.toString(), scratch);
SimpleTextUtil.writeNewline(data);
final DecimalFormat encoder = new DecimalFormat(sb.toString(), new DecimalFormatSymbols(Locale.ROOT));
int numDocsWritten = 0;
for(BytesRef value : values) {
// write length
final int length = value == null ? 0 : value.length;
SimpleTextUtil.write(data, LENGTH);
SimpleTextUtil.write(data, encoder.format(length), scratch);
SimpleTextUtil.writeNewline(data);
// write bytes -- don't use SimpleText.write
// because it escapes:
if (value != null) {
data.writeBytes(value.bytes, value.offset, value.length);
}
// pad to fit
for (int i = length; i < maxLength; i++) {
data.writeByte((byte)' ');
}
SimpleTextUtil.writeNewline(data);
if (value == null) {
SimpleTextUtil.write(data, "F", scratch);
} else {
SimpleTextUtil.write(data, "T", scratch);
}
SimpleTextUtil.writeNewline(data);
numDocsWritten++;
}
assert numDocs == numDocsWritten;
}
@Override
public void addSortedField(FieldInfo field, Iterable values, Iterable docToOrd) throws IOException {
assert fieldSeen(field.name);
assert field.getDocValuesType() == DocValuesType.SORTED;
writeFieldEntry(field, FieldInfo.DocValuesType.SORTED);
int valueCount = 0;
int maxLength = -1;
for(BytesRef value : values) {
maxLength = Math.max(maxLength, value.length);
valueCount++;
}
// write numValues
SimpleTextUtil.write(data, NUMVALUES);
SimpleTextUtil.write(data, Integer.toString(valueCount), scratch);
SimpleTextUtil.writeNewline(data);
// write maxLength
SimpleTextUtil.write(data, MAXLENGTH);
SimpleTextUtil.write(data, Integer.toString(maxLength), scratch);
SimpleTextUtil.writeNewline(data);
int maxBytesLength = Integer.toString(maxLength).length();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < maxBytesLength; i++) {
sb.append('0');
}
// write our pattern for encoding lengths
SimpleTextUtil.write(data, PATTERN);
SimpleTextUtil.write(data, sb.toString(), scratch);
SimpleTextUtil.writeNewline(data);
final DecimalFormat encoder = new DecimalFormat(sb.toString(), new DecimalFormatSymbols(Locale.ROOT));
int maxOrdBytes = Long.toString(valueCount+1L).length();
sb.setLength(0);
for (int i = 0; i < maxOrdBytes; i++) {
sb.append('0');
}
// write our pattern for ords
SimpleTextUtil.write(data, ORDPATTERN);
SimpleTextUtil.write(data, sb.toString(), scratch);
SimpleTextUtil.writeNewline(data);
final DecimalFormat ordEncoder = new DecimalFormat(sb.toString(), new DecimalFormatSymbols(Locale.ROOT));
// for asserts:
int valuesSeen = 0;
for(BytesRef value : values) {
// write length
SimpleTextUtil.write(data, LENGTH);
SimpleTextUtil.write(data, encoder.format(value.length), scratch);
SimpleTextUtil.writeNewline(data);
// write bytes -- don't use SimpleText.write
// because it escapes:
data.writeBytes(value.bytes, value.offset, value.length);
// pad to fit
for (int i = value.length; i < maxLength; i++) {
data.writeByte((byte)' ');
}
SimpleTextUtil.writeNewline(data);
valuesSeen++;
assert valuesSeen <= valueCount;
}
assert valuesSeen == valueCount;
for(Number ord : docToOrd) {
SimpleTextUtil.write(data, ordEncoder.format(ord.longValue()+1), scratch);
SimpleTextUtil.writeNewline(data);
}
}
@Override
public void addSortedSetField(FieldInfo field, Iterable values, Iterable docToOrdCount, Iterable ords) throws IOException {
assert fieldSeen(field.name);
assert field.getDocValuesType() == DocValuesType.SORTED_SET;
writeFieldEntry(field, FieldInfo.DocValuesType.SORTED_SET);
long valueCount = 0;
int maxLength = 0;
for(BytesRef value : values) {
maxLength = Math.max(maxLength, value.length);
valueCount++;
}
// write numValues
SimpleTextUtil.write(data, NUMVALUES);
SimpleTextUtil.write(data, Long.toString(valueCount), scratch);
SimpleTextUtil.writeNewline(data);
// write maxLength
SimpleTextUtil.write(data, MAXLENGTH);
SimpleTextUtil.write(data, Integer.toString(maxLength), scratch);
SimpleTextUtil.writeNewline(data);
int maxBytesLength = Integer.toString(maxLength).length();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < maxBytesLength; i++) {
sb.append('0');
}
// write our pattern for encoding lengths
SimpleTextUtil.write(data, PATTERN);
SimpleTextUtil.write(data, sb.toString(), scratch);
SimpleTextUtil.writeNewline(data);
final DecimalFormat encoder = new DecimalFormat(sb.toString(), new DecimalFormatSymbols(Locale.ROOT));
// compute ord pattern: this is funny, we encode all values for all docs to find the maximum length
int maxOrdListLength = 0;
StringBuilder sb2 = new StringBuilder();
Iterator ordStream = ords.iterator();
for (Number n : docToOrdCount) {
sb2.setLength(0);
int count = n.intValue();
for (int i = 0; i < count; i++) {
long ord = ordStream.next().longValue();
if (sb2.length() > 0) {
sb2.append(",");
}
sb2.append(Long.toString(ord));
}
maxOrdListLength = Math.max(maxOrdListLength, sb2.length());
}
sb2.setLength(0);
for (int i = 0; i < maxOrdListLength; i++) {
sb2.append('X');
}
// write our pattern for ord lists
SimpleTextUtil.write(data, ORDPATTERN);
SimpleTextUtil.write(data, sb2.toString(), scratch);
SimpleTextUtil.writeNewline(data);
// for asserts:
long valuesSeen = 0;
for(BytesRef value : values) {
// write length
SimpleTextUtil.write(data, LENGTH);
SimpleTextUtil.write(data, encoder.format(value.length), scratch);
SimpleTextUtil.writeNewline(data);
// write bytes -- don't use SimpleText.write
// because it escapes:
data.writeBytes(value.bytes, value.offset, value.length);
// pad to fit
for (int i = value.length; i < maxLength; i++) {
data.writeByte((byte)' ');
}
SimpleTextUtil.writeNewline(data);
valuesSeen++;
assert valuesSeen <= valueCount;
}
assert valuesSeen == valueCount;
ordStream = ords.iterator();
// write the ords for each doc comma-separated
for(Number n : docToOrdCount) {
sb2.setLength(0);
int count = n.intValue();
for (int i = 0; i < count; i++) {
long ord = ordStream.next().longValue();
if (sb2.length() > 0) {
sb2.append(",");
}
sb2.append(Long.toString(ord));
}
// now pad to fit: these are numbers so spaces work well. reader calls trim()
int numPadding = maxOrdListLength - sb2.length();
for (int i = 0; i < numPadding; i++) {
sb2.append(' ');
}
SimpleTextUtil.write(data, sb2.toString(), scratch);
SimpleTextUtil.writeNewline(data);
}
}
/** write the header for this field */
private void writeFieldEntry(FieldInfo field, FieldInfo.DocValuesType type) throws IOException {
SimpleTextUtil.write(data, FIELD);
SimpleTextUtil.write(data, field.name, scratch);
SimpleTextUtil.writeNewline(data);
SimpleTextUtil.write(data, TYPE);
SimpleTextUtil.write(data, type.toString(), scratch);
SimpleTextUtil.writeNewline(data);
}
@Override
public void close() throws IOException {
boolean success = false;
try {
assert !fieldsSeen.isEmpty();
// TODO: sheisty to do this here?
SimpleTextUtil.write(data, END);
SimpleTextUtil.writeNewline(data);
success = true;
} finally {
if (success) {
IOUtils.close(data);
} else {
IOUtils.closeWhileHandlingException(data);
}
}
}
}