NotNullConstraint.java
/*
* 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.spi.constraints;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Optional;
import static java.util.stream.Collectors.toCollection;
public class NotNullConstraint<T>
extends TableConstraint<T>
{
public NotNullConstraint(T column)
{
this(Optional.empty(), new LinkedHashSet<T>(Collections.singleton(column)));
}
public NotNullConstraint(Optional<String> name, T column)
{
this(name, new LinkedHashSet<T>(Collections.singleton(column)));
}
@JsonCreator
public NotNullConstraint(@JsonProperty("name") Optional<String> name,
@JsonProperty("columns") LinkedHashSet<T> columnNames)
{
super(name, columnNames, true, true, true);
}
@Override
public <T, R> Optional<TableConstraint<R>> rebaseConstraint(Map<T, R> assignments)
{
if (this.getColumns().stream().allMatch(assignments::containsKey)) {
return Optional.of(new NotNullConstraint<R>(this.getName(), (LinkedHashSet<R>) this.getColumns().stream().map(assignments::get).collect(toCollection(LinkedHashSet::new))));
}
else {
return Optional.empty();
}
}
}