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MyBatis framework for generating dynamic SQL
There is a newer version: 1.5.2
/**
 *    Copyright 2016-2017 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.mybatis.dynamic.sql.insert;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;

import org.mybatis.dynamic.sql.SqlColumn;
import org.mybatis.dynamic.sql.SqlTable;
import org.mybatis.dynamic.sql.util.ConstantMapping;
import org.mybatis.dynamic.sql.util.InsertMapping;
import org.mybatis.dynamic.sql.util.NullMapping;
import org.mybatis.dynamic.sql.util.PropertyMapping;
import org.mybatis.dynamic.sql.util.StringConstantMapping;

public class InsertDSL {

    private T record;
    private SqlTable table;
    private List columnMappings = new ArrayList<>();
    
    private InsertDSL(T record, SqlTable table) {
        this.record = record;
        this.table = table;
    }
    
    public  ColumnMappingFinisher map(SqlColumn column) {
        return new ColumnMappingFinisher<>(column);
    }
    
    public InsertModel build() {
        return InsertModel.withRecord(record)
                .withTable(table)
                .withColumnMappings(columnMappings)
                .build();
    }
    
    public static  IntoGatherer insert(T record) {
        return new IntoGatherer<>(record);
    }

    public static class IntoGatherer {
        private T record;
        
        private IntoGatherer(T record) {
            this.record = record;
        }

        public InsertDSL into(SqlTable table) {
            return new InsertDSL<>(record, table);
        }
    }
    
    public class ColumnMappingFinisher {
        private SqlColumn column;
            
        public ColumnMappingFinisher(SqlColumn column) {
            this.column = column;
        }
            
        public InsertDSL toProperty(String property) {
            columnMappings.add(PropertyMapping.of(column, property));
            return InsertDSL.this;
        }
            
        public InsertDSL toPropertyWhenPresent(String property, Supplier valueSupplier) {
            if (valueSupplier.get() != null) {
                toProperty(property);
            }
            return InsertDSL.this;
        }
            
        public InsertDSL toNull() {
            columnMappings.add(NullMapping.of(column));
            return InsertDSL.this;
        }
            
        public InsertDSL toConstant(String constant) {
            columnMappings.add(ConstantMapping.of(column, constant));
            return InsertDSL.this;
        }
            
        public InsertDSL toStringConstant(String constant) {
            columnMappings.add(StringConstantMapping.of(column, constant));
            return InsertDSL.this;
        }
    }
}