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Cassandra support for Spring Data
/*
* Copyright 2016-2020 the original author or authors.
*
* 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
*
* https://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.springframework.data.cassandra.core.cql.keyspace;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import com.datastax.oss.driver.api.core.CqlIdentifier;
import com.datastax.oss.driver.api.core.type.DataType;
/**
* Object to configure a {@code ALTER TYPE} specification.
*
* @author Fabio J. Mendes
* @author Mark Paluch
* @since 1.5
* @see CqlIdentifier
*/
public class AlterUserTypeSpecification extends UserTypeNameSpecification {
private final List changes = new ArrayList<>();
private AlterUserTypeSpecification(CqlIdentifier name) {
super(name);
}
/**
* Entry point into the {@link AlterColumnSpecification}'s fluent API given {@code typeName} to alter a user type.
* Convenient if imported statically.
*
* @param typeName must not be {@literal null} or empty.
* @return a new {@link AlterUserTypeSpecification}.
*/
public static AlterUserTypeSpecification alterType(String typeName) {
return alterType(CqlIdentifier.fromCql(typeName));
}
/**
* Entry point into the {@link AlterUserTypeSpecification}'s fluent API given {@code typeName} to alter a type.
* Convenient if imported statically.
*
* @param typeName must not be {@literal null} or empty.
* @return a new {@link AlterUserTypeSpecification}.
*/
private static AlterUserTypeSpecification alterType(CqlIdentifier typeName) {
return new AlterUserTypeSpecification(typeName);
}
/**
* Adds an {@literal ADD} to the list of field changes.
*
* @param field must not be {@literal null} or empty.
* @param type must not be {@literal null}.
* @return {@code this} {@link AlterUserTypeSpecification}.
*/
public AlterUserTypeSpecification add(String field, DataType type) {
return add(CqlIdentifier.fromCql(field), type);
}
/**
* Adds an {@literal ADD} to the list of field changes.
*
* @param field must not be {@literal null}.
* @param type must not be {@literal null}.
* @return {@code this} {@link AlterUserTypeSpecification}.
*/
public AlterUserTypeSpecification add(CqlIdentifier field, DataType type) {
return add(AddColumnSpecification.addColumn(field, type));
}
/**
* Adds an {@literal ALTER} to the list of field changes.
*
* @param field must not be {@literal null} or empty.
* @param type must not be {@literal null}.
* @return {@code this} {@link AlterUserTypeSpecification}.
*/
public AlterUserTypeSpecification alter(String field, DataType type) {
return alter(CqlIdentifier.fromCql(field), type);
}
/**
* Adds an {@literal ALTER} to the list of field changes.
*
* @param field must not be {@literal null}.
* @param type must not be {@literal null}.
* @return {@code this} {@link AlterUserTypeSpecification}.
*/
public AlterUserTypeSpecification alter(CqlIdentifier field, DataType type) {
return add(AlterColumnSpecification.alterColumn(field, type));
}
/**
* Adds an {@literal RENAME} to the list of field changes.
*
* @param from must not be {@literal null} or empty.
* @param to must not be {@literal null} or empty.
* @return {@code this} {@link AlterUserTypeSpecification}.
*/
public AlterUserTypeSpecification rename(String from, String to) {
return rename(CqlIdentifier.fromCql(from), CqlIdentifier.fromCql(to));
}
/**
* Adds an {@literal RENAME} to the list of field changes.
*
* @param from must not be {@literal null}.
* @param to must not be {@literal null} or empty.
* @return {@code this} {@link AlterUserTypeSpecification}.
*/
public AlterUserTypeSpecification rename(CqlIdentifier from, CqlIdentifier to) {
return add(new RenameColumnSpecification(from, to));
}
private AlterUserTypeSpecification add(ColumnChangeSpecification specification) {
changes.add(specification);
return this;
}
/**
* @return an unmodifiable list of field changes.
*/
public List getChanges() {
return Collections.unmodifiableList(changes);
}
}