| /* |
| * 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.iotdb.db.queryengine.transformation.dag.input; |
| |
| import org.apache.iotdb.db.exception.query.QueryProcessException; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.ConstantOperand; |
| import org.apache.iotdb.db.queryengine.transformation.api.LayerPointReader; |
| import org.apache.iotdb.db.queryengine.transformation.api.YieldableState; |
| import org.apache.iotdb.db.utils.CommonUtils; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.utils.Binary; |
| |
| import org.apache.commons.lang3.Validate; |
| |
| import java.io.IOException; |
| |
| /** LayerPointReader for constants. */ |
| public class ConstantInputReader implements LayerPointReader { |
| |
| private final ConstantOperand expression; |
| |
| protected int cachedInt; |
| protected long cachedLong; |
| protected float cachedFloat; |
| protected double cachedDouble; |
| protected boolean cachedBoolean; |
| protected Binary cachedBinary; |
| |
| public ConstantInputReader(ConstantOperand expression) throws QueryProcessException { |
| this.expression = Validate.notNull(expression); |
| |
| Object value = CommonUtils.parseValue(expression.getDataType(), expression.getValueString()); |
| if (value == null) { |
| throw new QueryProcessException( |
| "Invalid constant operand: " + expression.getExpressionString()); |
| } |
| |
| switch (expression.getDataType()) { |
| case INT32: |
| cachedInt = (int) value; |
| break; |
| case INT64: |
| cachedLong = (long) value; |
| break; |
| case FLOAT: |
| cachedFloat = (float) value; |
| break; |
| case DOUBLE: |
| cachedDouble = (double) value; |
| break; |
| case TEXT: |
| cachedBinary = (Binary) value; |
| break; |
| case BOOLEAN: |
| cachedBoolean = (boolean) value; |
| break; |
| default: |
| throw new QueryProcessException("Unsupported type: " + expression.getDataType()); |
| } |
| } |
| |
| @Override |
| public boolean isConstantPointReader() { |
| return true; |
| } |
| |
| @Override |
| public YieldableState yield() { |
| return YieldableState.YIELDABLE; |
| } |
| |
| @Override |
| public boolean next() { |
| return true; |
| } |
| |
| @Override |
| public void readyForNext() { |
| // Do nothing |
| } |
| |
| @Override |
| public TSDataType getDataType() { |
| return expression.getDataType(); |
| } |
| |
| @Override |
| public long currentTime() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int currentInt() throws IOException { |
| return cachedInt; |
| } |
| |
| @Override |
| public long currentLong() throws IOException { |
| return cachedLong; |
| } |
| |
| @Override |
| public float currentFloat() throws IOException { |
| return cachedFloat; |
| } |
| |
| @Override |
| public double currentDouble() throws IOException { |
| return cachedDouble; |
| } |
| |
| @Override |
| public boolean currentBoolean() throws IOException { |
| return cachedBoolean; |
| } |
| |
| @Override |
| public Binary currentBinary() throws IOException { |
| return cachedBinary; |
| } |
| |
| @Override |
| public boolean isCurrentNull() { |
| return false; |
| } |
| } |