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Cassandra support for Spring Data
/*
* Copyright 2013-2018 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 java.util.Map;
import org.springframework.data.cassandra.core.cql.keyspace.AlterKeyspaceSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.Option;
/**
* CQL generator for generating {@code ALTER TABLE} statements.
*
* @author Matthew T. Adams
*/
public class AlterKeyspaceCqlGenerator extends KeyspaceOptionsCqlGenerator {
public AlterKeyspaceCqlGenerator(AlterKeyspaceSpecification specification) {
super(specification);
}
public static String toCql(AlterKeyspaceSpecification specification) {
return new AlterKeyspaceCqlGenerator(specification).toCql();
}
@Override
public StringBuilder toCql(StringBuilder cql) {
preambleCql(cql);
optionsCql(cql);
cql.append(";");
return cql;
}
private void preambleCql(StringBuilder cql) {
cql.append("ALTER KEYSPACE ").append(spec().getName()).append(" ");
}
@SuppressWarnings("unchecked")
private void optionsCql(StringBuilder cql) {
// begin options clause
Map options = spec().getOptions();
if (!options.isEmpty()) {
// option preamble
boolean first = true;
cql.append(" WITH ");
// end option preamble
if (!options.isEmpty()) {
for (String name : options.keySet()) {
// append AND if we're not on first option
if (first) {
first = false;
} else {
cql.append(" AND ");
}
// append =
cql.append(name);
Object value = options.get(name);
if (value == null) { // then assume string-only, valueless option like "COMPACT STORAGE"
continue;
}
cql.append(" = ");
if (value instanceof Map) {
optionValueMap((Map