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Cassandra support for Spring Data
/*
* Copyright 2013-2024 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.generator;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.springframework.data.cassandra.core.cql.keyspace.CqlStringUtils;
import org.springframework.data.cassandra.core.cql.keyspace.CreateIndexSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.CreateIndexSpecification.ColumnFunction;
import org.springframework.util.StringUtils;
/**
* CQL generator for generating a {@code CREATE INDEX} statement.
*
* @author Matthew T. Adams
* @author David Webb
* @author Mark Paluch
*/
public class CreateIndexCqlGenerator extends IndexNameCqlGenerator {
public CreateIndexCqlGenerator(CreateIndexSpecification specification) {
super(specification);
}
public static String toCql(CreateIndexSpecification specification) {
return new CreateIndexCqlGenerator(specification).toCql();
}
@Override
public StringBuilder toCql(StringBuilder cql) {
cql.append("CREATE").append(spec().isCustom() ? " CUSTOM" : "").append(" INDEX")
.append(spec().getIfNotExists() ? " IF NOT EXISTS" : "");
if (spec().getName() != null) {
cql.append(" ").append(spec().getName().asCql(true));
}
cql.append(" ON ").append(spec().getTableName().asCql(true)).append(" (");
if (spec().getColumnFunction() != ColumnFunction.NONE) {
cql.append(spec().getColumnFunction().name()).append("(").append(spec().getColumnName().asCql(true)).append(")");
} else {
cql.append(spec().getColumnName().asCql(true));
}
cql.append(")");
if (spec().isCustom()) {
cql.append(" USING ").append("'").append(spec().getUsing()).append("'");
}
Map options = spec().getOptions();
if (!options.isEmpty()) {
List entries = new ArrayList<>(options.size());
options.forEach((key, value) -> entries
.add(String.format("'%s': '%s'", CqlStringUtils.escapeSingle(key), CqlStringUtils.escapeSingle(value))));
StringBuilder optionsCql = new StringBuilder(" WITH OPTIONS = ").append("{");
optionsCql.append(StringUtils.collectionToDelimitedString(entries, ", "));
optionsCql.append("}");
cql.append(optionsCql);
}
cql.append(";");
return cql;
}
}