notqueryitem.java

一个工作流设计及定义的系统,可以直接与数据库结合进行系统工作流程的定义及应用.

/*
 * Copyright (c) 2005, John Mettraux, OpenWFE.org
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * . Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.  
 * 
 * . Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * 
 * . Neither the name of the "OpenWFE" nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id: NotQueryItem.java,v 1.11 2005/05/17 16:41:06 jmettraux Exp $
 */

//
// NotQueryItem.java
//
// [e-mail]
//
// generated with 
// jtmpl 1.1.00 16.08.2003 John Mettraux ([e-mail])
//

package openwfe.org.xdbc.query;

import openwfe.org.sql.SqlUtils;
import openwfe.org.xdbc.XdbcException;


/**
 * the intersection between 2 sets of results...
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Id: NotQueryItem.java,v 1.11 2005/05/17 16:41:06 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public class NotQueryItem

    extends CompositeQueryItem

{

    /*
    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger
        .getLogger(NotQueryItem.class.getName());
    */

    //
    // CONSTANTS & co

    public final static String XML_ELT_NAME = "not";

    //
    // FIELDS
    
    //
    // CONSTRUCTORS

    //
    // METHODS from QueryItem

    public String getQueryString ()
    {
        StringBuffer sb = new StringBuffer();

        sb.append("NOT (");
        sb.append(((QueryItem)this.items.get(0)).getQueryString());
        sb.append(")");

        return sb.toString();
    }

    public boolean matches (org.jdom.Element elt)
    {
        if (this.items.size() > 0)
            return ! ((QueryItem)this.items.get(0)).matches(elt);
        return false;
    }

    public org.jdom.Element encode ()
    {
        org.jdom.Element result = new org.jdom.Element(XML_ELT_NAME);

        result.addContent(((QueryItem)this.items.get(0)).encode());

        return result;
    }

    /**
     * override
     */
    public IdSet query (String clientIdLike, java.sql.Connection con)
        throws XdbcException
    {
        if (this.items.size() < 1) return new IdSet();

        QueryItem child = (QueryItem)this.items.get(0);

        IdSet childResult = child.query(clientIdLike, con);

        if (childResult.isNegative())
        {
            childResult.setNegative(false);
            return childResult;
        }

        //
        // prepare query
        
        StringBuffer sb = new StringBuffer();

        sb.append("SELECT ");
        sb.append("id, ");
        sb.append(CLIENT_ID);
        sb.append(" FROM ");
        sb.append(DOCUMENTS);
        sb.append(" WHERE ");

        if (clientIdLike != null)
        {
            sb.append(CLIENT_ID);
            sb.append(" LIKE ");
            sb.append(SqlUtils.prepareString(clientIdLike));
            sb.append(", ");
        }

        java.util.Iterator it = childResult.getSet().iterator();
        while (it.hasNext())
        {
            sb.append("id");
            sb.append(" <> ");
            sb.append(it.next().toString());

            if (it.hasNext()) sb.append(" AND ");
        }

        String query = sb.toString();

        log.debug(" ~~~ query >\n"+query+"\n<");

        //
        // execute query

        return AtomicQueryItem.executeQuery(con, query);
    }

    //
    // METHODS from CompositeQueryItem

    public static CompositeQueryItem buildNew ()
    {
        return new NotQueryItem();
    }

    /**
     * override
     */
    protected IdSet combineResults (IdSet set1, IdSet set2)
    {
        return null;
    }

    /**
     * override
     */
    public CompositeQueryItem add (QueryItem qi)
    {
        if (this.items.size() < 1) this.items.add(qi);
        return this;
    }

    //
    // METHODS

    //
    // STATIC METHODS

    public static QueryItem decode (org.jdom.Element elt)
        throws XdbcException
    {
        NotQueryItem result = new NotQueryItem();

        java.util.Iterator it = elt.getChildren().iterator();
        while (it.hasNext())
            result.items.add(QueryDecoder.decode((org.jdom.Element)it.next()));

        return result;
    }

}