/*
* Copyright 2013-2017 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.cassandra.core.cql.generator;
import static org.springframework.cassandra.core.PrimaryKeyType.*;
import static org.springframework.cassandra.core.cql.CqlStringUtils.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.springframework.cassandra.core.keyspace.ColumnSpecification;
import org.springframework.cassandra.core.keyspace.CreateTableSpecification;
import org.springframework.cassandra.core.keyspace.Option;
/**
* CQL generator for generating a {@code CREATE TABLE} statement.
*
* @author Matthew T. Adams
* @author Alex Shvid
*/
public class CreateTableCqlGenerator extends TableCqlGenerator<CreateTableSpecification> {
public static String toCql(CreateTableSpecification specification) {
return new CreateTableCqlGenerator(specification).toCql();
}
public CreateTableCqlGenerator(CreateTableSpecification specification) {
super(specification);
}
@Override
public StringBuilder toCql(StringBuilder cql) {
cql = noNull(cql);
preambleCql(cql);
columnsAndOptionsCql(cql);
cql.append(";");
return cql;
}
protected StringBuilder preambleCql(StringBuilder cql) {
return noNull(cql).append("CREATE TABLE ").append(spec().getIfNotExists() ? "IF NOT EXISTS " : "")
.append(spec().getName());
}
@SuppressWarnings("unchecked")
protected StringBuilder columnsAndOptionsCql(StringBuilder cql) {
cql = noNull(cql);
// begin columns
cql.append(" (");
List<ColumnSpecification> partitionKeys = new ArrayList<>();
List<ColumnSpecification> clusterKeys = new ArrayList<>();
for (ColumnSpecification col : spec().getColumns()) {
col.toCql(cql).append(", ");
if (col.getKeyType() == PARTITIONED) {
partitionKeys.add(col);
} else if (col.getKeyType() == CLUSTERED) {
clusterKeys.add(col);
}
}
// begin primary key clause
cql.append("PRIMARY KEY (");
if (partitionKeys.size() > 1) {
// begin partition key clause
cql.append("(");
}
appendColumnNames(cql, partitionKeys);
if (partitionKeys.size() > 1) {
cql.append(")");
// end partition key clause
}
if (!clusterKeys.isEmpty()) {
cql.append(", ");
}
appendColumnNames(cql, clusterKeys);
cql.append(")");
// end primary key clause
cql.append(")");
// end columns
StringBuilder ordering = createOrderingClause(clusterKeys);
// begin options
// begin option clause
Map<String, Object> options = spec().getOptions();
if (ordering != null || !options.isEmpty()) {
// option preamble
boolean first = true;
cql.append(" WITH ");
// end option preamble
if (ordering != null) {
cql.append(ordering);
first = false;
}
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 <name> = <value>
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<Option, Object>) value, cql);
continue; // end non-empty value map
}
// else just use value as string
cql.append(value.toString());
}
}
}
// end options
return cql;
}
private static StringBuilder createOrderingClause(List<ColumnSpecification> columns) {
StringBuilder ordering = null;
boolean first = true;
for (ColumnSpecification col : columns) {
if (col.getOrdering() != null) { // then ordering specified
if (ordering == null) { // then initialize ordering clause
ordering = new StringBuilder().append("CLUSTERING ORDER BY (");
}
if (first) {
first = false;
} else {
ordering.append(", ");
}
ordering.append(col.getName()).append(" ").append(col.getOrdering().cql());
}
}
if (ordering != null) { // then end ordering option
ordering.append(")");
}
return ordering;
}
private static void appendColumnNames(StringBuilder str, List<ColumnSpecification> columns) {
boolean first = true;
for (ColumnSpecification col : columns) {
if (first) {
first = false;
} else {
str.append(", ");
}
str.append(col.getName());
}
}
}