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/*
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package org.jooq.impl;

import java.sql.SQLException;

import org.jooq.BindContext;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.DSLContext;
import org.jooq.QueryPart;
import org.jooq.QueryPartInternal;
import org.jooq.RenderContext;
import org.jooq.conf.SettingsTools;
import org.jooq.exception.DataAccessException;
import org.jooq.exception.SQLDialectNotSupportedException;

/**
 * @author Lukas Eder
 */
abstract class AbstractQueryPart implements QueryPartInternal {

    private static final long serialVersionUID = 2078114876079493107L;

    // -------------------------------------------------------------------------
    // [#1544] The deprecated Attachable and Attachable internal API
    // -------------------------------------------------------------------------

    Configuration configuration() {
        return new DefaultConfiguration();
    }

    // -------------------------------------------------------------------------
    // Deprecated API
    // -------------------------------------------------------------------------

    /**
     * @deprecated - 3.4.0 - [#2694] - Use
     *             {@link QueryPartInternal#accept(Context)} instead.
     */
    @Override
    @Deprecated
    public final void toSQL(RenderContext context) {}

    /**
     * @deprecated - 3.4.0 - [#2694] - Use
     *             {@link QueryPartInternal#accept(Context)} instead.
     */
    @Override
    @Deprecated
    public final void bind(BindContext context) throws DataAccessException {}

    // -------------------------------------------------------------------------
    // The QueryPart and QueryPart internal API
    // -------------------------------------------------------------------------

    /**
     * Subclasses may override this
     */
    @Override
    public boolean declaresFields() {
        return false;
    }

    /**
     * Subclasses may override this
     */
    @Override
    public boolean declaresTables() {
        return false;
    }

    /**
     * Subclasses may override this
     */
    @Override
    public boolean declaresWindows() {
        return false;
    }

    /**
     * Subclasses may override this
     */
    @Override
    public boolean declaresCTE() {
        return false;
    }

    /**
     * Subclasses may override this
     */
    @Override
    public boolean generatesCast() {
        return false;
    }

    // -------------------------------------------------------------------------
    // The Object API
    // -------------------------------------------------------------------------

    @Override
    public boolean equals(Object that) {
        if (this == that) {
            return true;
        }

        // This is a working default implementation. It should be overridden by
        // concrete subclasses, to improve performance
        if (that instanceof QueryPart) {
            String sql1 = create().renderInlined(this);
            String sql2 = create().renderInlined((QueryPart) that);

            return sql1.equals(sql2);
        }

        return false;
    }

    @Override
    public int hashCode() {
        // This is a working default implementation. It should be overridden by
        // concrete subclasses, to improve performance

        return create().renderInlined(this).hashCode();
    }

    @Override
    public String toString() {
        try {
            return create(configuration().derive(SettingsTools.clone(configuration().settings()).withRenderFormatted(true))).renderInlined(this);
        }
        catch (SQLDialectNotSupportedException e) {
            return "[ ... " + e.getMessage() + " ... ]";
        }
    }

    // -------------------------------------------------------------------------
    // Internal convenience methods
    // -------------------------------------------------------------------------

    /**
     * Internal convenience method
     */
    protected final DSLContext create() {
        return create(configuration());
    }

    /**
     * Internal convenience method
     */
    protected final DSLContext create(Configuration configuration) {
        return DSL.using(configuration);
    }

    /**
     * Internal convenience method
     */
    protected final DSLContext create(Context ctx) {
        return DSL.using(ctx.configuration());
    }

    /**
     * Internal convenience method
     */
    protected final DataAccessException translate(String sql, SQLException e) {
        return Tools.translate(sql, e);
    }
}