jooq/jOOQ/src/main/java/org/jooq/impl/Join.java

/**
 * Copyright (c) 2009-2011, Lukas Eder, lukas.eder@gmail.com
 * All rights reserved.
 *
 * This software is licensed to you under the Apache License, Version 2.0
 * (the "License"); You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * . Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * . Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * . Neither the name "jOOQ" nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.jooq.impl;

import java.util.Collection;
import java.util.List;

import org.jooq.Attachable;
import org.jooq.BindContext;
import org.jooq.Condition;
import org.jooq.Field;
import org.jooq.JoinType;
import org.jooq.QueryPart;
import org.jooq.RenderContext;
import org.jooq.SQLDialect;
import org.jooq.Table;
import org.jooq.TableLike;

/**
 * @author Lukas Eder
 */
class Join extends AbstractQueryPart {

    private static final long           serialVersionUID = 2275930365728978050L;

    private final TableLike<?>          table;
    private final JoinType              type;
    private final ConditionProviderImpl condition;
    private final FieldList             using;
    private final boolean               usingSyntax;

    Join(TableLike<?> table, JoinType type, Condition... conditions) {
        this.condition = new ConditionProviderImpl();
        this.condition.addConditions(conditions);
        this.using = new FieldList();
        this.usingSyntax = false;

        this.table = table;
        this.type = type;
    }

    Join(TableLike<?> table, JoinType type, Collection<? extends Field<?>> using) {
        this.condition = new ConditionProviderImpl();
        this.using = new FieldList(using);
        this.usingSyntax = true;

        this.table = table;
        this.type = type;
    }

    @Override
    public final List<Attachable> getAttachables() {
        return getAttachables(table, condition, using);
    }

    @Override
    public final void bind(BindContext context) {
        context.bind(getTable());

        if (usingSyntax) {
            context.bind((QueryPart) using);
        }
        else {
            context.bind(getCondition());
        }
    }

    final Condition getCondition() {
        return condition.getWhere();
    }

    final Table<?> getTable() {
        return table.asTable();
    }

    final JoinType getType(RenderContext context) {
        if (context.getDialect() == SQLDialect.ASE && type == JoinType.CROSS_JOIN) {
            return JoinType.JOIN;
        }
        else {
            return type;
        }
    }

    @Override
    public final void toSQL(RenderContext context) {
        context.sql(getType(context).toSQL());
        context.sql(" ");
        context.sql(getTable());

        switch (getType(context)) {

            // CROSS JOIN does not have any additional clauses
            case CROSS_JOIN:

            // NATURAL JOIN does not have any additional clauses
            case NATURAL_JOIN:
            case NATURAL_LEFT_OUTER_JOIN:
            case NATURAL_RIGHT_OUTER_JOIN:
                break;

            // Regular JOINs
            default: {
                toSQL0(context);
                break;
            }
        }
    }

    private void toSQL0(RenderContext context) {
        if (usingSyntax) {
            context.sql(" using (");
            Util.toSQLNames(context, using);
            context.sql(")");
        }
        else {
            context.sql(" on ").sql(getCondition());
        }
    }

    @Override
    public final boolean declaresTables() {
        return true;
    }
}