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Allow FST builder to use different writer (apache#12543)
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69 changes: 69 additions & 0 deletions
69
lucene/core/src/java/org/apache/lucene/util/fst/ByteBlockPoolReverseBytesReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.lucene.util.fst; | ||
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| import java.io.IOException; | ||
| import org.apache.lucene.util.ByteBlockPool; | ||
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| /** Reads in reverse from a ByteBlockPool. */ | ||
| final class ByteBlockPoolReverseBytesReader extends FST.BytesReader { | ||
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| private final ByteBlockPool buf; | ||
| // the difference between the FST node address and the hash table copied node address | ||
| private long posDelta; | ||
| private long pos; | ||
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| public ByteBlockPoolReverseBytesReader(ByteBlockPool buf) { | ||
| this.buf = buf; | ||
| } | ||
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| @Override | ||
| public byte readByte() { | ||
| return buf.readByte(pos--); | ||
| } | ||
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| @Override | ||
| public void readBytes(byte[] b, int offset, int len) { | ||
| for (int i = 0; i < len; i++) { | ||
| b[offset + i] = buf.readByte(pos--); | ||
| } | ||
| } | ||
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| @Override | ||
| public void skipBytes(long numBytes) throws IOException { | ||
| pos -= numBytes; | ||
| } | ||
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| @Override | ||
| public long getPosition() { | ||
| return pos + posDelta; | ||
| } | ||
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| @Override | ||
| public void setPosition(long pos) { | ||
| this.pos = pos - posDelta; | ||
| } | ||
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| @Override | ||
| public boolean reversed() { | ||
| return true; | ||
| } | ||
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| public void setPosDelta(long posDelta) { | ||
| this.posDelta = posDelta; | ||
| } | ||
| } |
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103 changes: 103 additions & 0 deletions
103
lucene/core/src/java/org/apache/lucene/util/fst/DataOutputFSTWriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package org.apache.lucene.util.fst; | ||
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| import java.io.Closeable; | ||
| import java.io.IOException; | ||
| import org.apache.lucene.store.DataOutput; | ||
| import org.apache.lucene.util.Accountable; | ||
| import org.apache.lucene.util.RamUsageEstimator; | ||
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| /** | ||
| * An {@link FSTWriter} which write to a DataOutput | ||
| * | ||
| * @lucene.experimental | ||
| */ | ||
| public class DataOutputFSTWriter implements FSTWriter { | ||
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| private static final long BASE_RAM_BYTES_USED = | ||
| RamUsageEstimator.shallowSizeOfInstance(DataOutputFSTWriter.class); | ||
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| private final DataOutput dataOutput; | ||
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| protected boolean finish = false; | ||
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| private long size = 0L; | ||
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| /** | ||
| * ctor | ||
| * | ||
| * @param dataOutput the data output to write to | ||
| */ | ||
| public DataOutputFSTWriter(DataOutput dataOutput) { | ||
| this.dataOutput = dataOutput; | ||
| } | ||
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| @Override | ||
| public long ramBytesUsed() { | ||
| long size = BASE_RAM_BYTES_USED; | ||
| if (dataOutput instanceof Accountable) { | ||
| size += ((Accountable) dataOutput).ramBytesUsed(); | ||
| } | ||
| return size; | ||
| } | ||
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| @Override | ||
| public long size() { | ||
| return size; | ||
| } | ||
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| @Override | ||
| public void writeByte(byte b) throws IOException { | ||
| size++; | ||
| dataOutput.writeByte(b); | ||
| } | ||
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| @Override | ||
| public void writeBytes(byte[] b, int offset, int length) throws IOException { | ||
| size += length; | ||
| dataOutput.writeBytes(b, offset, length); | ||
| } | ||
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| @Override | ||
| public void finish() throws IOException { | ||
| finish = true; | ||
| if (dataOutput instanceof Closeable) { | ||
| ((Closeable) dataOutput).close(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void writeTo(DataOutput out) throws IOException { | ||
| // Technically we can support this method, as the DataOutput by this time has already been | ||
| // closed. | ||
| // But allow the FST which is already written to a DataOutput to be saved to another DataOutput | ||
| // would be rather a strange use case | ||
| throw new UnsupportedOperationException("writeTo(DataOutput) is not supported by this class"); | ||
| } | ||
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| @Override | ||
| public FST.BytesReader getReverseBytesReader() { | ||
| // Technically we can support this method, as the DataOutput by this time has already been | ||
| // closed. | ||
| // However, I think ideally we would want the FSTWriter/FSTCompiler to only write the FST to the | ||
| // DataOutput, and | ||
| // some process later on can construct the FST using the FSTStore method. | ||
| throw new UnsupportedOperationException( | ||
| "getReverseBytesReader() is not supported by this class"); | ||
| } | ||
| } |
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