org.apache.hudi.internal.schema.visitor.InternalSchemaVisitor 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.hudi.internal.schema.visitor;
import org.apache.hudi.internal.schema.InternalSchema;
import org.apache.hudi.internal.schema.Type;
import org.apache.hudi.internal.schema.Types;
import java.util.List;
/**
* Base class of schema visitor.
*/
public abstract class InternalSchemaVisitor {
public void beforeField(Types.Field field) {
}
public void afterField(Types.Field field) {
}
public void beforeArrayElement(Types.Field elementField) {
beforeField(elementField);
}
public void afterArrayElement(Types.Field elementField) {
afterField(elementField);
}
public void beforeMapKey(Types.Field keyField) {
beforeField(keyField);
}
public void afterMapKey(Types.Field keyField) {
afterField(keyField);
}
public void beforeMapValue(Types.Field valueField) {
beforeField(valueField);
}
public void afterMapValue(Types.Field valueField) {
afterField(valueField);
}
public T schema(InternalSchema schema, T recordResult) {
return null;
}
public T record(Types.RecordType record, List fieldResults) {
return null;
}
public T field(Types.Field field, T fieldResult) {
return null;
}
public T array(Types.ArrayType array, T elementResult) {
return null;
}
public T map(Types.MapType map, T keyResult, T valueResult) {
return null;
}
public T primitive(Type.PrimitiveType primitive) {
return null;
}
}