| /* |
| * 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.drill.common.expression; |
| |
| import java.io.IOException; |
| |
| import org.apache.drill.common.config.DrillConfig; |
| import org.apache.drill.common.expression.visitors.ExprVisitor; |
| import org.apache.drill.common.parser.LogicalExpressionParser; |
| import org.apache.drill.common.types.TypeProtos.MajorType; |
| |
| import com.fasterxml.jackson.core.JsonGenerator; |
| import com.fasterxml.jackson.core.JsonParser; |
| import com.fasterxml.jackson.databind.DeserializationContext; |
| import com.fasterxml.jackson.databind.SerializerProvider; |
| import com.fasterxml.jackson.databind.annotation.JsonSerialize; |
| import com.fasterxml.jackson.databind.deser.std.StdDeserializer; |
| import com.fasterxml.jackson.databind.ser.std.StdSerializer; |
| |
| @JsonSerialize(using = LogicalExpression.Se.class) |
| public interface LogicalExpression extends Iterable<LogicalExpression> { |
| |
| MajorType getMajorType(); |
| |
| <T, V, E extends Exception> T accept(ExprVisitor<T, V, E> visitor, V value) throws E; |
| |
| ExpressionPosition getPosition(); |
| |
| int getSelfCost(); |
| int getCumulativeCost(); |
| |
| @SuppressWarnings("serial") |
| class De extends StdDeserializer<LogicalExpression> { |
| DrillConfig config; |
| |
| public De(DrillConfig config) { |
| super(LogicalExpression.class); |
| this.config = config; |
| } |
| |
| @Override |
| public LogicalExpression deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException { |
| String expr = jp.getText(); |
| |
| if (expr == null || expr.isEmpty()) { |
| return null; |
| } |
| |
| return LogicalExpressionParser.parse(expr); |
| } |
| } |
| |
| @SuppressWarnings("serial") |
| class Se extends StdSerializer<LogicalExpression> { |
| |
| protected Se() { |
| super(LogicalExpression.class); |
| } |
| |
| @Override |
| public void serialize(LogicalExpression value, JsonGenerator jgen, SerializerProvider provider) throws IOException { |
| StringBuilder sb = new StringBuilder(); |
| ExpressionStringBuilder esb = new ExpressionStringBuilder(); |
| value.accept(esb, sb); |
| jgen.writeString(sb.toString()); |
| } |
| } |
| } |