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Spring Data Relational support
/*
* Copyright 2019-2023 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.relational.core.sql;
/**
* Factory for common {@link Expression}s.
*
* @author Mark Paluch
* @author Jens Schauder
* @since 1.1
* @see SQL
* @see Conditions
* @see Functions
*/
public abstract class Expressions {
private static Expression ASTERISK = new SimpleExpression("*");
/**
* @return a new asterisk {@code *} expression.
*/
public static Expression asterisk() {
return ASTERISK;
}
/**
* Creates a plain {@code sql} {@link Expression}.
*
* @param sql the SQL, must not be {@literal null} or empty.
* @return a SQL {@link Expression}.
*/
public static Expression just(String sql) {
return new SimpleExpression(sql);
}
/**
* @return a new {@link Table}.scoped asterisk {@code .*} expression.
*/
public static Expression asterisk(Table table) {
return table.asterisk();
}
/**
* @return a new {@link Cast} expression.
* @since 2.3
*/
public static Expression cast(Expression expression, String targetType) {
return Cast.create(expression, targetType);
}
// Utility constructor.
private Expressions() {}
static public class SimpleExpression extends AbstractSegment implements Expression {
private final String expression;
SimpleExpression(String expression) {
this.expression = expression;
}
@Override
public String toString() {
return expression;
}
}
}
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