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modules/accumulo/src/main/java/org/apache/fluo/accumulo/iterators/ColumnBuffer.java
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.fluo.accumulo.iterators; | ||
|
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| import java.lang.IllegalArgumentException; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.function.LongPredicate; | ||
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| import org.apache.accumulo.core.data.Key; | ||
| import org.apache.accumulo.core.data.PartialKey; | ||
| import org.apache.accumulo.core.data.Value; | ||
|
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| /** | ||
| * This class buffers Keys that all have the same row+column. Internally | ||
| * it only stores one Key, a list of timestamps and a list of values. At iteration | ||
| * time it materializes each Key+Value. | ||
| */ | ||
| class ColumnBuffer { | ||
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| private Key key; | ||
| private ArrayList<Long> timeStamps; | ||
| private ArrayList<byte[]> values; | ||
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| public ColumnBuffer() { | ||
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| this.key = null; | ||
| this.timeStamps = new ArrayList<>(); | ||
| this.values = new ArrayList<>(); | ||
| } | ||
|
|
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| /** | ||
| * @param timestamp Timestamp to be added to buffer | ||
| * @param v Value to be added to buffer | ||
| */ | ||
| private void add(long timestamp, byte[] v) { | ||
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| timeStamps.add(timestamp); | ||
| values.add(v); | ||
| } | ||
|
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| /** | ||
| * When empty, the first key added sets the row+column. After this all keys | ||
| * added must have the same row+column. | ||
| * | ||
| * @param k Key to be added to buffer | ||
| * @param v Value to be added to buffer | ||
| */ | ||
| public void add(Key k, byte[] vByte) throws IllegalArgumentException { | ||
| vByte = Arrays.copyOf(vByte, vByte.length); | ||
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| if (key == null) { | ||
| key = new Key(k); | ||
| add(k.getTimestamp(), vByte); | ||
| } else if (key.equals(k, PartialKey.ROW_COLFAM_COLQUAL_COLVIS)) { | ||
| add(k.getTimestamp(), vByte); | ||
| } else { | ||
| throw new IllegalArgumentException(); | ||
| } | ||
| } | ||
|
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| /** | ||
| * When empty, the first key added sets the row+column. After this all keys | ||
| * added must have the same row+column. | ||
| * | ||
| * @param k Key to be added to buffer | ||
| * @param v Value to be added to buffer | ||
| */ | ||
| public void add(Key k, Value v) throws IllegalArgumentException { | ||
| add(k, v.get()); | ||
| } | ||
|
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| /** | ||
| * Clears the dest ColumnBuffer and inserts all entries in dest where the timestamp passes | ||
| * the timestampTest. | ||
| * | ||
| * @param dest Destination ColumnBuffer | ||
| * @param timestampTest Test to determine which timestamps get added to dest | ||
| */ | ||
| public void copyTo(ColumnBuffer dest, LongPredicate timestampTest) { | ||
| dest.clear(); | ||
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| if (key != null) { | ||
| dest.key = new Key(key); | ||
| } | ||
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| for (int i = 0; i < timeStamps.size(); i++) { | ||
| long time = timeStamps.get(i); | ||
| if (timestampTest.test(time)) { | ||
| dest.add(time, values.get(i)); | ||
| } | ||
| } | ||
| } | ||
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| public void clear() { | ||
| timeStamps.clear(); | ||
| values.clear(); | ||
| key = null; | ||
| } | ||
|
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| /** | ||
| * @return the size of the current buffer | ||
| */ | ||
| public int size() { | ||
| return timeStamps.size(); | ||
| } | ||
|
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| /** | ||
| * @param pos Position of the Key that will be retrieved | ||
| * @return The key at a given position | ||
| */ | ||
| public Key getKey(int pos) { | ||
| Key tmpKey = new Key(key); | ||
| tmpKey.setTimestamp(timeStamps.get(pos)); | ||
| return tmpKey; | ||
| } | ||
|
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| /** | ||
| * @param pos Position of the Value that will be retrieved | ||
| * @return The value at a given position | ||
| */ | ||
| public Value getValue(int pos) { | ||
| return new Value(values.get(pos)); | ||
| } | ||
| } |
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38 changes: 38 additions & 0 deletions
38
modules/accumulo/src/test/java/org/apache/fluo/accumulo/iterators/ColumnBufferTest.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,38 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.fluo.accumulo.iterators; | ||
|
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| import java.lang.IllegalArgumentException; | ||
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| import org.apache.accumulo.core.data.Key; | ||
| import org.apache.accumulo.core.data.Value; | ||
| import org.junit.Assert; | ||
| import org.junit.Test; | ||
|
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| public class ColumnBufferTest { | ||
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| @Test | ||
| public void testDifferentKeys() { | ||
| ColumnBuffer columnBuffer = new ColumnBuffer(); | ||
| columnBuffer.add(new Key("row1"), new Value()); | ||
| try { | ||
| columnBuffer.add(new Key("row2"), new Value()); | ||
| Assert.fail(); | ||
| } catch (IllegalArgumentException e) { | ||
|
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| } | ||
| } | ||
| } |