TableAliasCalculatorWithParent.java

/*
 *    Copyright 2016-2024 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.mybatis.dynamic.sql.render;

import java.util.Objects;
import java.util.Optional;

import org.mybatis.dynamic.sql.SqlTable;

public class TableAliasCalculatorWithParent implements TableAliasCalculator {
    private final TableAliasCalculator parent;
    private final TableAliasCalculator child;

    private TableAliasCalculatorWithParent(Builder builder) {
        parent = Objects.requireNonNull(builder.parent);
        child = Objects.requireNonNull(builder.child);
    }

    @Override
    public Optional<String> aliasForColumn(SqlTable table) {
        Optional<String> answer = child.aliasForColumn(table);
        if (answer.isPresent()) {
            return answer;
        }
        return parent.aliasForColumn(table);
    }

    @Override
    public Optional<String> aliasForTable(SqlTable table) {
        Optional<String> answer = child.aliasForTable(table);
        if (answer.isPresent()) {
            return answer;
        }
        return parent.aliasForTable(table);
    }

    public static class Builder {
        private TableAliasCalculator parent;
        private TableAliasCalculator child;

        public Builder withParent(TableAliasCalculator parent) {
            this.parent = parent;
            return this;
        }

        public Builder withChild(TableAliasCalculator child) {
            this.child = child;
            return this;
        }

        public TableAliasCalculatorWithParent build() {
            return new TableAliasCalculatorWithParent(this);
        }
    }
}