org.mybatis.dynamic.sql.SqlCriterion Maven / Gradle / Ivy

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/*
 *    Copyright ${license.git.copyrightYears} 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.mybatis.dynamic.sql;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Stream;

public abstract class SqlCriterion {

    private final String connector;
    private final List subCriteria;

    protected SqlCriterion(AbstractBuilder builder) {
        connector = builder.connector;
        subCriteria = Objects.requireNonNull(builder.subCriteria);
    }

    public Optional connector() {
        return Optional.ofNullable(connector);
    }

    public  Stream mapSubCriteria(Function mapper) {
        return subCriteria.stream().map(mapper);
    }

    public abstract  R accept(SqlCriterionVisitor visitor);

    protected abstract static class AbstractBuilder> {
        private String connector;
        private final List subCriteria = new ArrayList<>();

        public T withConnector(String connector) {
            this.connector = connector;
            return getThis();
        }

        public T withSubCriteria(List subCriteria) {
            this.subCriteria.addAll(subCriteria);
            return getThis();
        }

        protected abstract T getThis();
    }
}