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/**
 * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * This work is dual-licensed
 * - under the Apache Software License 2.0 (the "ASL")
 * - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
 * =============================================================================
 * You may choose which license applies to you:
 *
 * - If you're using this work with Open Source databases, you may choose
 *   either ASL or jOOQ License.
 * - If you're using this work with at least one commercial database, you must
 *   choose jOOQ License
 *
 * For more information, please visit http://www.jooq.org/licenses
 *
 * Apache Software License 2.0:
 * -----------------------------------------------------------------------------
 * 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.
 *
 * jOOQ License and Maintenance Agreement:
 * -----------------------------------------------------------------------------
 * Data Geekery grants the Customer the non-exclusive, timely limited and
 * non-transferable license to install and use the Software under the terms of
 * the jOOQ License and Maintenance Agreement.
 *
 * This library is distributed with a LIMITED WARRANTY. See the jOOQ License
 * and Maintenance Agreement for more details: http://www.jooq.org/licensing
 */
package org.jooq.impl;

import static org.jooq.Clause.CREATE_INDEX;
import static org.jooq.impl.DSL.fieldByName;
import static org.jooq.impl.DSL.name;
import static org.jooq.impl.DSL.tableByName;

import org.jooq.Clause;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.CreateIndexFinalStep;
import org.jooq.CreateIndexStep;
import org.jooq.Field;
import org.jooq.QueryPart;
import org.jooq.Table;

/**
 * @author Lukas Eder
 */
class CreateIndexImpl extends AbstractQuery implements

    // Cascading interface implementations for CREATE INDEX behaviour
    CreateIndexStep,
    CreateIndexFinalStep {

    /**
     * Generated UID
     */
    private static final long     serialVersionUID = 8904572826501186329L;
    private static final Clause[] CLAUSES          = { CREATE_INDEX };

    private final String index;
    private Table     table;
    private Field[]   fields;

    CreateIndexImpl(Configuration configuration, String index) {
        super(configuration);

        this.index = index;
    }

    // ------------------------------------------------------------------------
    // XXX: DSL API
    // ------------------------------------------------------------------------

    @Override
    public final CreateIndexFinalStep on(Table t, Field... f) {
        this.table = t;
        this.fields = f;

        return this;
    }

    @Override
    public final CreateIndexFinalStep on(String tableName, String... fieldNames) {
        Field[] f = new Field[fieldNames.length];

        for (int i = 0; i < f.length; i++)
            f[i] = fieldByName(fieldNames[i]);

        return on(tableByName(tableName), f);
    }

    // ------------------------------------------------------------------------
    // XXX: QueryPart API
    // ------------------------------------------------------------------------

    @Override
    public final void accept(Context ctx) {
        ctx.keyword("create index")
           .sql(" ")
           .visit(name(index))
           .sql(" ")
           .keyword("on")
           .sql(" ")
           .visit(table)
           .sql("(")
           .qualify(false)
           .visit(new QueryPartList(fields))
           .qualify(true)
           .sql(")");
    }

    @Override
    public final Clause[] clauses(Context ctx) {
        return CLAUSES;
    }
}