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Cassandra support for Spring Data
/*
* Copyright 2016-2018 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
*
* 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.springframework.data.cassandra.core.cql.generator;
import org.springframework.data.cassandra.core.cql.keyspace.AddColumnSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.AlterColumnSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.AlterUserTypeSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.ColumnChangeSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.RenameColumnSpecification;
import org.springframework.util.Assert;
/**
* CQL generator for generating {@code ALTER TYPE} statements.
*
* @author Fabio J. Mendes
* @author Mark Paluch
* @since 1.5
* @see AlterUserTypeSpecification
* @see AddColumnSpecification
* @see RenameColumnSpecification
* @see AlterColumnSpecification
*/
public class AlterUserTypeCqlGenerator extends UserTypeNameCqlGenerator {
/**
* Create a new {@link AlterUserTypeCqlGenerator} for a {@link AlterUserTypeSpecification}.
*
* @param specification must not be {@literal null}.
*/
public AlterUserTypeCqlGenerator(AlterUserTypeSpecification specification) {
super(specification);
}
public static String toCql(AlterUserTypeSpecification specification) {
return new AlterUserTypeCqlGenerator(specification).toCql();
}
/*
* (non-Javadoc)
* @see org.springframework.data.cassandra.core.cql.generator.UserTypeNameCqlGenerator#toCql(java.lang.StringBuilder)
*/
@Override
public StringBuilder toCql(StringBuilder cql) {
Assert.notNull(getSpecification().getName(), "User type name must not be null");
Assert.isTrue(!getSpecification().getChanges().isEmpty(),
String.format("User type [%s] does not contain fields", getSpecification().getName()));
return changesCql(preambleCql(cql)).append(";");
}
private StringBuilder preambleCql(StringBuilder cql) {
return cql.append("ALTER TYPE ").append(spec().getName()).append(' ');
}
private StringBuilder changesCql(StringBuilder cql) {
boolean first = true;
boolean lastChangeWasRename = false;
for (ColumnChangeSpecification change : spec().getChanges()) {
if (!first) {
cql.append(' ');
}
getCqlGeneratorFor(change, lastChangeWasRename).toCql(cql);
lastChangeWasRename = change instanceof RenameColumnSpecification;
first = false;
}
return cql;
}
private ColumnChangeCqlGenerator getCqlGeneratorFor(ColumnChangeSpecification change,
boolean lastChangeWasRename) {
if (change instanceof AddColumnSpecification) {
return new AddColumnCqlGenerator((AddColumnSpecification) change);
}
if (change instanceof AlterColumnSpecification) {
return new AlterColumnCqlGenerator((AlterColumnSpecification) change);
}
if (change instanceof RenameColumnSpecification) {
return new RenameColumnCqlGenerator(lastChangeWasRename ? "AND" : RenameColumnCqlGenerator.RENAME, change);
}
throw new IllegalArgumentException(
String.format("Unknown ColumnChangeSpecification type: %s", change.getClass().getName()));
}
}