Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

*

* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

*

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

*

* For more information, contact:

*

*  Generalitat Valenciana

*   Conselleria d'Infraestructures i Transport

*   Av. Blasco Ib??ez, 50

*   46010 VALENCIA

*   SPAIN

*

*      +34 963862235

*   gvsig@gva.es

*      www.gvsig.gva.es

*

*    or

*

*   IVER T.I. S.A

*   Salamanca 50

*   46005 Valencia

*   Spain

*

*   +34 963163400

*   dac@iver.es

*/

package es.gva.cit.catalogClient.languages;

import java.util.Iterator;

/**

 * This class is used to create a Basic Encoding Rules (BER) query.

 * See the specification for more information.

 * 

 * 

 * @author Jorge Piera Llodra (piera_jor@gva.es)

 * @see http://www.loc.gov/z3950/agency/

 */

public class BasicEncodingRules extends AbstractGeneralLanguage {

/**

 * It adds a new clause to the query

 * 

 * 

 * @param use It is a number that represent an attribute (4=Title,62=abstract,...)

 * @param structure It defines the attribute type (1=Phrase,2=wors,...)

 * @param relation Relation between the attribute and the query (1=LessThan,3=equal,...)

 * @param line String with the user introduced value

 * @param concordancia Relationship between different words of the same field (more than one words)

 * E,A o Y --> Exact, All, anY

 * @param operator Relationship between fields (title, abstract)

 * 'and' or 'or'

 */

    public void addClauses(String use, String structure, String relation, String line, String concordancia, String operator) {        

        currentClause = null;

        //Cut the words

        Iterator values = parseValues(line, concordancia);

        addClauses(use, structure, relation, values, concordancia,operator);

    } 

/**

 * It realize the same function than the "addClauses(String use, String structure

 * String relation,String line, String concordancia)" function, but the words

 * to find are in a vector.

 * 

 * 

 * @param use 

 * @param structure 

 * @param relation 

 * @param values 

 * @param concordancia 

 * @param operator 

 */

    public void addClauses(String use, String structure, String relation, Iterator values, String concordancia, String operator) {        

        while (values.hasNext())

            addTerm(use, structure, relation, (String) values.next(),

                getOperator(concordancia));

        addCurrentClauseQuery(operator);

    } 

/**

 * Add a new serch field

 * 

 * 

 * @param use BER use

 * @param structure BER structure

 * @param relation BER relation

 * @param value Filed value

 * @param operator "and" or "or"

 */

    private void addTerm(String use, String structure, String relation, String value, String operator) {        

        StringBuffer term = new StringBuffer();

        if (use != null) {

            term.append("@attr 1=" + use + " ");

        }

        if (structure != null) {

            term.append("@attr 4=" + structure + " ");

        }

        if (relation != null) {

            term.append("@attr 2=" + relation + " ");

        }

        term.append("\"" + value + "\" ");

        if (currentClause == null) {

            currentClause = term.toString();

        } else {

            currentClause = "@" + operator + " " + currentClause + " " + term;

        }

    } 

/**

 * It adds a new query to the current query.

 * 

 * 

 * @param operator 'and' or 'or'. Relation between fields

 */

    protected void addCurrentClauseQuery(String operator) {        

        if (currentClause != null) {

            if (currentQuery == null) {

                currentQuery = currentClause;

            } else {

                currentQuery = "@" + operator + " " + currentQuery + " " + currentClause;

            }

        }

    } 

/**

 * It returns the complete BER query

 * 

 * 

 * @return 

 */

    public String toString(String database) {        

        if ((database == null) || (database.equals(""))){

                database = "geo";

        }

            return "@attrset bib-1 " + currentQuery;

    } 

 }