| /* |
| * 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 |
| * |
| * https://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.trevni; |
| |
| import java.io.IOException; |
| |
| /** A column output buffer for array columns. */ |
| class ArrayColumnOutputBuffer extends ColumnOutputBuffer { |
| private int length; // remaining in current array |
| |
| private static final int NONE = -1; |
| |
| private int runLength; // length of current run |
| private int runValue = NONE; // what kind of run |
| |
| public ArrayColumnOutputBuffer(ColumnFileWriter writer, ColumnMetaData meta) throws IOException { |
| super(writer, meta); |
| assert getMeta().isArray() || getMeta().getParent() != null; |
| assert !getMeta().hasIndexValues(); |
| } |
| |
| @Override |
| public void writeLength(int l) throws IOException { |
| assert this.length == 0; |
| assert l >= 0; |
| this.length = l; |
| if (l == runValue) { |
| runLength++; // continue a run |
| return; |
| } |
| flushRun(); // end a run |
| if (l == 1 || l == 0) { |
| runLength = 1; // start a run |
| runValue = l; |
| } else { |
| getBuffer().writeLength(l); // not a run |
| } |
| } |
| |
| @Override |
| public void writeValue(Object value) throws IOException { |
| assert length > 0; |
| if (getMeta().getType() != ValueType.NULL) { |
| flushRun(); |
| getBuffer().writeValue(value, getMeta().getType()); |
| } |
| length -= 1; |
| } |
| |
| @Override |
| void flushBuffer() throws IOException { |
| flushRun(); |
| super.flushBuffer(); |
| } |
| |
| private void flushRun() throws IOException { |
| if (runLength == 0) // not in run |
| return; |
| else if (runLength == 1) // single value |
| getBuffer().writeLength(runValue); |
| else // a run |
| getBuffer().writeLength((3 - runValue) - (runLength << 1)); |
| |
| runLength = 0; // reset |
| runValue = NONE; |
| } |
| |
| } |