org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonDeserializer Maven / Gradle / Ivy
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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.
*/
package org.apache.flink.table.planner.plan.nodes.exec.serde;
import org.apache.flink.table.api.TableException;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonParser;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.DeserializationContext;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.JsonNode;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.rex.RexWindowBound;
import org.apache.calcite.rex.RexWindowBounds;
import java.io.IOException;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.FIELD_NAME_IS_FOLLOWING;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.FIELD_NAME_IS_PRECEDING;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.FIELD_NAME_KIND;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.FIELD_NAME_OFFSET;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.KIND_BOUNDED_WINDOW;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.KIND_CURRENT_ROW;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.KIND_UNBOUNDED_FOLLOWING;
import static org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer.KIND_UNBOUNDED_PRECEDING;
/**
* JSON deserializer for {@link RexWindowBound}. refer to {@link RexWindowBoundJsonSerializer} for
* serializer.
*/
public class RexWindowBoundJsonDeserializer extends StdDeserializer {
public RexWindowBoundJsonDeserializer() {
super(RexWindowBound.class);
}
@Override
public RexWindowBound deserialize(
JsonParser jsonParser, DeserializationContext deserializationContext)
throws IOException {
JsonNode jsonNode = jsonParser.readValueAsTree();
String kind = jsonNode.get(FIELD_NAME_KIND).asText().toUpperCase();
switch (kind) {
case KIND_CURRENT_ROW:
return RexWindowBounds.CURRENT_ROW;
case KIND_UNBOUNDED_FOLLOWING:
return RexWindowBounds.UNBOUNDED_FOLLOWING;
case KIND_UNBOUNDED_PRECEDING:
return RexWindowBounds.UNBOUNDED_PRECEDING;
case KIND_BOUNDED_WINDOW:
FlinkDeserializationContext flinkDeserializationContext =
(FlinkDeserializationContext) deserializationContext;
RexNode offset = null;
if (jsonNode.get(FIELD_NAME_OFFSET) != null) {
offset =
flinkDeserializationContext
.getObjectMapper()
.readValue(
jsonNode.get(FIELD_NAME_OFFSET).toString(),
RexNode.class);
}
if (offset != null && jsonNode.get(FIELD_NAME_IS_FOLLOWING) != null) {
return RexWindowBounds.following(offset);
} else if (offset != null && jsonNode.get(FIELD_NAME_IS_PRECEDING) != null) {
return RexWindowBounds.preceding(offset);
} else {
throw new TableException("Unknown RexWindowBound: " + jsonNode.toString());
}
default:
throw new TableException("Unknown RexWindowBound: " + jsonNode.toString());
}
}
}