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/*
 * Copyright 2011, Mysema Ltd
 *
 * 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.mysema.query.sql;

import com.mysema.query.QueryFactory;
import com.mysema.query.sql.dml.SQLDeleteClause;
import com.mysema.query.sql.dml.SQLInsertClause;
import com.mysema.query.sql.dml.SQLMergeClause;
import com.mysema.query.sql.dml.SQLUpdateClause;
import com.mysema.query.types.Expression;
import com.mysema.query.types.Path;
import com.mysema.query.types.SubQueryExpression;

/**
 * Factory interface for query and clause creation.
 *
 * The default implementation is {@link SQLQueryFactory} and should be used for general
 * query creation. Type specific variants are available if database specific queries need to be created.
 *
 * @author tiwe
 *
 * @param  query type
 * @param  subquery type
 * @param  delete clause type
 * @param  update clause type
 * @param  insert clause type
 * @param  merge clause type
 */
public interface SQLCommonQueryFactory, // extends AbstractSQLQuery
    SQ extends AbstractSQLSubQuery,
    D extends SQLDeleteClause,
    U extends SQLUpdateClause,
    I extends SQLInsertClause,
    M extends SQLMergeClause> extends QueryFactory {

    /**
     * Create a new DELETE clause
     *
     * @param path
     * @return
     */
    D delete(RelationalPath path);

    /**
     * Create a new SELECT query
     *
     * @param from
     * @return
     */
    Q from(Expression from);

    /**
     * Create a new SELECT query
     *
     * @param from
     * @return
     */
    Q from(Expression... from);

    /**
     * Create a new SELECT query
     *
     * @param from
     * @return
     */
    Q from(SubQueryExpression subQuery, Path alias);

    /**
     * Create a new INSERT INTO clause
     *
     * @param path
     * @return
     */
    I insert(RelationalPath path);

    /**
     * Create a new MERGE clause
     *
     * @param path
     * @return
     */
    M merge(RelationalPath path);

    /**
     * Create a new UPDATE clause
     *
     * @param path
     * @return
     */
    U update(RelationalPath path);

    /* (non-Javadoc)
     * @see com.mysema.query.QueryFactory#query()
     */
    @Override
    Q query();

    /* (non-Javadoc)
     * @see com.mysema.query.QueryFactory#subQuery()
     */
    @Override
    SQ subQuery();

    /**
     * @param from
     * @return
     */
    SQ subQuery(Expression from);

}