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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.SCHEMA;
import static org.jooq.Clause.SCHEMA_REFERENCE;

import java.util.Collections;
import java.util.List;

import org.jooq.Clause;
import org.jooq.Context;
import org.jooq.Schema;
import org.jooq.Sequence;
import org.jooq.Table;
import org.jooq.UDT;
import org.jooq.tools.StringUtils;

/**
 * A common base class for database schemata
 * 
 * This type is for JOOQ INTERNAL USE only. Do not reference directly
 *
 * @author Lukas Eder
 */
public class SchemaImpl extends AbstractQueryPart implements Schema {

    private static final long     serialVersionUID = -8101463810207566546L;
    private static final Clause[] CLAUSES          = { SCHEMA, SCHEMA_REFERENCE };

    private final String          schemaName;

    public SchemaImpl(String name) {
        super();

        this.schemaName = name;
    }

    @Override
    public final String getName() {
        return schemaName;
    }

    @Override
    public final void accept(Context ctx) {
        ctx.literal(getName());
    }

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

    @Override
    public final Table getTable(String name) {
        for (Table table : getTables()) {
            if (table.getName().equals(name)) {
                return table;
            }
        }

        return null;
    }

    @Override
    public final UDT getUDT(String name) {
        for (UDT udt : getUDTs()) {
            if (udt.getName().equals(name)) {
                return udt;
            }
        }

        return null;
    }

    @Override
    public final Sequence getSequence(String name) {
        for (Sequence sequence : getSequences()) {
            if (sequence.getName().equals(name)) {
                return sequence;
            }
        }

        return null;
    }

    /**
     * {@inheritDoc}
     * 

     * Subclasses should override this method
     */
    @Override
    public List> getTables() {
        return Collections.emptyList();
    }

    /**
     * {@inheritDoc}
     * 

     * Subclasses should override this method
     */
    @Override
    public List> getUDTs() {
        return Collections.emptyList();
    }

    /**
     * {@inheritDoc}
     * 
     * Subclasses should override this method
     */
    @Override
    public List> getSequences() {
        return Collections.emptyList();
    }

    // ------------------------------------------------------------------------
    // XXX: Object API
    // ------------------------------------------------------------------------

    @Override
    public int hashCode() {

        // [#1938] This is a much more efficient hashCode() implementation
        // compared to that of standard QueryParts
        return getName() != null ? getName().hashCode() : 0;
    }

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

        // [#2144] SchemaImpl equality can be decided without executing the
        // rather expensive implementation of AbstractQueryPart.equals()
        if (that instanceof SchemaImpl) {
            return StringUtils.equals(getName(), (((SchemaImpl) that).getName()));
        }

        return super.equals(that);
    }
}