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    • org.apache.iceberg.transforms.VoidTransform 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.iceberg.transforms;

import java.io.ObjectStreamException;
import org.apache.iceberg.expressions.BoundPredicate;
import org.apache.iceberg.expressions.UnboundPredicate;
import org.apache.iceberg.types.Type;

class VoidTransform implements Transform {
  private static final VoidTransform INSTANCE = new VoidTransform<>();

  @SuppressWarnings("unchecked")
  static  VoidTransform get() {
    return (VoidTransform) INSTANCE;
  }

  private VoidTransform() {
  }

  @Override
  public Void apply(Object value) {
    return null;
  }

  @Override
  public boolean canTransform(Type type) {
    return true;
  }

  @Override
  public Type getResultType(Type sourceType) {
    return sourceType;
  }

  @Override
  public UnboundPredicate projectStrict(String name, BoundPredicate predicate) {
    return null;
  }

  @Override
  public UnboundPredicate project(String name, BoundPredicate predicate) {
    return null;
  }

  @Override
  public String toHumanString(Void value) {
    return "null";
  }

  @Override
  public String toString() {
    return "void";
  }

  Object writeReplace() throws ObjectStreamException {
    return SerializationProxies.VoidTransformProxy.get();
  }
}
    
    
    
    

    




    
    
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