Quadcap Embeddable Database

com/quadcap/sql/meta/MetaSchemas.java

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package com.quadcap.sql.meta;

/* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.IOException;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Vector;

import java.sql.DatabaseMetaData;
import java.sql.SQLException;

import com.quadcap.sql.Column;
import com.quadcap.sql.Database;
import com.quadcap.sql.Row;
import com.quadcap.sql.Session;

import com.quadcap.sql.index.Btree;
import com.quadcap.sql.index.BCursor;

import com.quadcap.sql.types.*;

import com.quadcap.util.Debug;

/**
 * A Cursor supporting the <code>getSchemas</code> function.
 *
 * @author Stan Bailes
 */
public class MetaSchemas extends MetaCursor {
    static Column[] cols = {
        new Column("TABLE_SCHEM", typeString)                   // 1
    };

    static int[] sortColumns = { 1 };

    /**
     * Cursor constructor.
     */
    public MetaSchemas(Session session)
        throws SQLException
    {
        super(session, null);
        try {
            addColumns(cols);
            HashMap schemaNames = new HashMap();
            Database db = session.getDatabase();
            session.getTableWriteLock("#Schema");
            synchronized (db.getFile().getLock()) {
                Iterator iter = db.getRelationNameIterator();
                while (iter.hasNext()) {
                    String name = iter.next().toString();
                    int idx = name.indexOf('.');
                    if (idx > 0) {
                        name = name.substring(0, idx);
                    } else {
                        name = session.getConnection().getAuth();
                    }
                    if (!schemaNames.containsKey(name)) {
                        Row row = new Row(1);
                        row.set(1, new ValueString(name));
                        addRow(row);
                        schemaNames.put(name, "");
                    }
                }
            }
            sort();
        } catch (ValueException e) {
            Debug.print(e);
            SQLException te = new SQLException(e.toString(), "Q000P");
            te.setNextException(e);
            throw te;
        } catch (IOException e) {
            Debug.print(e);
            throw new SQLException(e.toString(), "Q000Q");
        }           
    }
    
    /**
     * Sort by type
     */
    public int[] getSortColumns() {
        return sortColumns;
    }    
}