/*
* Licensed 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 com.facebook.presto.sql;
import com.facebook.presto.sql.parser.SqlParser;
import com.facebook.presto.sql.tree.Expression;
import com.facebook.presto.sql.tree.FunctionCall;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import javax.inject.Inject;
import java.io.IOException;
import java.util.Optional;
import static com.facebook.presto.sql.ExpressionUtils.rewriteIdentifiersToSymbolReferences;
public final class Serialization
{
private Serialization() {}
public static class ExpressionSerializer
extends JsonSerializer<Expression>
{
@Override
public void serialize(Expression expression, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
throws IOException
{
jsonGenerator.writeString(ExpressionFormatter.formatExpression(expression, Optional.empty()));
}
}
public static class ExpressionDeserializer
extends JsonDeserializer<Expression>
{
private final SqlParser sqlParser;
@Inject
public ExpressionDeserializer(SqlParser sqlParser)
{
this.sqlParser = sqlParser;
}
@Override
public Expression deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
throws IOException
{
return rewriteIdentifiersToSymbolReferences(sqlParser.createExpression(jsonParser.readValueAs(String.class)));
}
}
public static class FunctionCallDeserializer
extends JsonDeserializer<FunctionCall>
{
private final SqlParser sqlParser;
@Inject
public FunctionCallDeserializer(SqlParser sqlParser)
{
this.sqlParser = sqlParser;
}
@Override
public FunctionCall deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
throws IOException
{
return (FunctionCall) rewriteIdentifiersToSymbolReferences(sqlParser.createExpression(jsonParser.readValueAs(String.class)));
}
}
}