org.apache.flink.table.planner.plan.nodes.exec.serde.RexWindowBoundJsonSerializer 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,
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* See the License for the specific language governing permissions and
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*/
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.JsonGenerator;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.SerializerProvider;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ser.std.StdSerializer;
import org.apache.calcite.rex.RexWindowBound;
import java.io.IOException;
/**
* JSON serializer for {@link RexWindowBound}. refer to {@link RexWindowBoundJsonDeserializer} for
* deserializer.
*
* Supports serialize CURRENT_ROW, UNBOUNDED_PRECEDING, UNBOUNDED_FOLLOWING, Preceding Bounded
* Window and Following Bounded Window.
*/
public class RexWindowBoundJsonSerializer extends StdSerializer {
public static final String FIELD_NAME_KIND = "kind";
public static final String KIND_CURRENT_ROW = "CURRENT_ROW";
public static final String KIND_UNBOUNDED_PRECEDING = "UNBOUNDED_PRECEDING";
public static final String KIND_UNBOUNDED_FOLLOWING = "UNBOUNDED_FOLLOWING";
public static final String KIND_BOUNDED_WINDOW = "BOUNDED_WINDOW";
public static final String FIELD_NAME_IS_PRECEDING = "isPreceding";
public static final String FIELD_NAME_IS_FOLLOWING = "isFollowing";
public static final String FIELD_NAME_OFFSET = "offset";
public RexWindowBoundJsonSerializer() {
super(RexWindowBound.class);
}
@Override
public void serialize(
RexWindowBound rexWindowBound, JsonGenerator gen, SerializerProvider serializerProvider)
throws IOException {
gen.writeStartObject();
if (rexWindowBound.isCurrentRow()) {
gen.writeStringField(FIELD_NAME_KIND, KIND_CURRENT_ROW);
} else if (rexWindowBound.isUnbounded()) {
if (rexWindowBound.isPreceding()) {
gen.writeStringField(FIELD_NAME_KIND, KIND_UNBOUNDED_PRECEDING);
} else if (rexWindowBound.isFollowing()) {
gen.writeStringField(FIELD_NAME_KIND, KIND_UNBOUNDED_FOLLOWING);
} else {
throw new TableException("Unknown RexWindowBound: " + rexWindowBound);
}
} else {
gen.writeStringField(FIELD_NAME_KIND, KIND_BOUNDED_WINDOW);
if (rexWindowBound.isPreceding()) {
gen.writeBooleanField(FIELD_NAME_IS_PRECEDING, true);
} else if (rexWindowBound.isFollowing()) {
gen.writeBooleanField(FIELD_NAME_IS_FOLLOWING, true);
} else {
throw new TableException("Unknown RexWindowBound: " + rexWindowBound);
}
gen.writeObjectField(FIELD_NAME_OFFSET, rexWindowBound.getOffset());
}
gen.writeEndObject();
}
}