| /* |
| * 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.phoenix.expression; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.sql.SQLException; |
| |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.phoenix.execute.RuntimeContext; |
| import org.apache.phoenix.expression.visitor.ExpressionVisitor; |
| import org.apache.phoenix.schema.tuple.Tuple; |
| import org.apache.phoenix.schema.types.PDataType; |
| |
| public class CorrelateVariableFieldAccessExpression extends BaseTerminalExpression { |
| private final RuntimeContext runtimeContext; |
| private final String variableId; |
| private final Expression fieldAccessExpression; |
| |
| public CorrelateVariableFieldAccessExpression(RuntimeContext context, String variableId, Expression fieldAccessExpression) { |
| super(); |
| this.runtimeContext = context; |
| this.variableId = variableId; |
| this.fieldAccessExpression = fieldAccessExpression; |
| } |
| |
| @Override |
| public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) { |
| Tuple variable = runtimeContext.getCorrelateVariableValue(variableId); |
| if (variable == null) |
| throw new RuntimeException("Variable '" + variableId + "' not set."); |
| |
| return fieldAccessExpression.evaluate(variable, ptr); |
| } |
| |
| @Override |
| public <T> T accept(ExpressionVisitor<T> visitor) { |
| return visitor.visit(this); |
| } |
| |
| @Override |
| public void write(DataOutput output) throws IOException { |
| ImmutableBytesWritable ptr = new ImmutableBytesWritable(); |
| boolean success = evaluate(null, ptr); |
| Object value = success ? getDataType().toObject(ptr) : null; |
| try { |
| LiteralExpression expr = LiteralExpression.newConstant(value, getDataType()); |
| expr.write(output); |
| } catch (SQLException e) { |
| throw new IOException(e); |
| } |
| } |
| |
| @SuppressWarnings("rawtypes") |
| @Override |
| public PDataType getDataType() { |
| return this.fieldAccessExpression.getDataType(); |
| } |
| |
| } |