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Lightweight Object SQL Relational Mapping (OSRM)
There is a newer version: 6.1
/*
 * Copyright 2017 @objectsql.com
 *
 * 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 com.objectsql.support;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Join implements Serializable {

    private JoinType type;
    private List conditions;
    private AliasTable table;

    public Object getTable(){
        return table.getTable();
    }

    public Join(AliasTable table){
        this(table, JoinType.LEFT_JOIN);
    }

    public Join(AliasTable table, JoinType type){
        this.table = table;
        this.type = type;
        this.conditions = new ArrayList();
    }

    public static Join create(AliasTable table){
        return new Join(table);
    }

    public static Join create(AliasTable table, JoinType type){
        return new Join(table, type);
    }

    public Join on(Column column, Object value, ExpressionType expressionType){
        conditions.add(new Condition().and(new Expression(column, value, expressionType)));
        return this;
    }

    public Join on(String columnName, Object value, ExpressionType expressionType){
        conditions.add(new Condition().and(new Expression(new Column(this.table.getAlias(), columnName), value, expressionType)));
        return this;
    }

    public  Join on(LambdaQuery lambdaQuery, Object value, ExpressionType expressionType){
        conditions.add(new Condition().and(new Expression(new Column(this.table.getAlias(), lambdaQuery.getColumnName()), value, expressionType)));
        return this;
    }

    public Join on(String columnName, Column column){
        conditions.add(new Condition().and(new Expression(new Column(this.table.getAlias(), columnName), column, ExpressionType.CDT_EQUAL)));
        return this;
    }

    public  Join on(LambdaQuery lambdaQuery, Column column){
        conditions.add(new Condition().and(new Expression(new Column(this.table.getAlias(), lambdaQuery.getColumnName()), column, ExpressionType.CDT_EQUAL)));
        return this;
    }

    public Join on(Column thisColumn, Column column){
        conditions.add(new Condition().and(new Expression(thisColumn, column, ExpressionType.CDT_EQUAL)));
        return this;
    }

    public Join on(Condition condition){
        if(condition != null) {
            conditions.add(condition);
        }
        return this;
    }

    public JoinType getType() {
        return type;
    }

    public void setType(JoinType type) {
        this.type = type;
    }

    public List getConditions() {
        return conditions;
    }

    public void setConditions(List conditions) {
        this.conditions = conditions;
    }

    public String getAlias() {
        return this.table.getAlias();
    }

}