    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/model/filterencoding/ExpressionDefines.java $
    002    /*----------------------------------------------------------------------------
    003     This file is part of deegree, http://deegree.org/
    004     Copyright (C) 2001-2009 by:
    005       Department of Geography, University of Bonn
    006     and
    007       lat/lon GmbH
    008
    009     This library is free software; you can redistribute it and/or modify it under
    010     the terms of the GNU Lesser General Public License as published by the Free
    011     Software Foundation; either version 2.1 of the License, or (at your option)
    012     any later version.
    013     This library is distributed in the hope that it will be useful, but WITHOUT
    014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
    016     details.
    017     You should have received a copy of the GNU Lesser General Public License
    018     along with this library; if not, write to the Free Software Foundation, Inc.,
    019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    020
    021     Contact information:
    022
    023     lat/lon GmbH
    024     Aennchenstr. 19, 53177 Bonn
    025     Germany
    026     http://lat-lon.de/
    027
    028     Department of Geography, University of Bonn
    029     Prof. Dr. Klaus Greve
    030     Postfach 1147, 53001 Bonn
    031     Germany
    032     http://www.geographie.uni-bonn.de/deegree/
    033
    034     e-mail: info@deegree.org
    035    ----------------------------------------------------------------------------*/
    036    package org.deegree.model.filterencoding;
    037
    038    import java.util.HashMap;
    039    import java.util.Map;
    040
    041    /**
    042     * Defines codes and constants for easy coping with the different kinds of Expressions (both
    043     * XML-Entities & JavaObjects).
    044     *
    045     * @author Markus Schneider
    046     * @version 06.08.2002
    047     */
    048    public class ExpressionDefines {
    049
    050        // expression codes
    051        /**
    052         *
    053         */
    054        public static final int EXPRESSION = 0;
    055
    056        /**
    057         *
    058         */
    059        public static final int PROPERTYNAME = 1;
    060
    061        /**
    062         *
    063         */
    064        public static final int LITERAL = 2;
    065
    066        /**
    067         *
    068         */
    069        public static final int FUNCTION = 3;
    070
    071        /**
    072         *
    073         */
    074        public static final int ADD = 4;
    075
    076        /**
    077         *
    078         */
    079        public static final int SUB = 5;
    080
    081        /**
    082         *
    083         */
    084        public static final int MUL = 6;
    085
    086        /**
    087         *
    088         */
    089        public static final int DIV = 7;
    090
    091        /**
    092         *
    093         */
    094        public static final int UNKNOWN = -1;
    095
    096        /**
    097         * Returns the id of an expression for a given name.
    098         *
    099         * @param name
    100         *
    101         * @return EXPRESSION / PROPERTYNAME / LITERAL / ...
    102         */
    103        public synchronized static int getIdByName( String name ) {
    104            if ( names == null )
    105                buildHashMaps();
    106            ExpressionInfo expression = names.get( name.toLowerCase() );
    107            if ( expression == null )
    108                return UNKNOWN;
    109            return expression.id;
    110        }
    111
    112        /**
    113         * Returns the name of an expression for a given id.
    114         *
    115         * @param id
    116         *
    117         * @return null / Name of expression
    118         */
    119        public static String getNameById( int id ) {
    120            if ( names == null )
    121                buildHashMaps();
    122            ExpressionInfo expression = ids.get( new Integer( id ) );
    123            if ( expression == null )
    124                return null;
    125            return expression.name;
    126        }
    127
    128        // used to associate names with the expressions
    129        private static Map<String, ExpressionInfo> names = null;
    130
    131        // used to associate ids (Integers) with the expressions
    132        private static Map<Integer, ExpressionInfo> ids = null;
    133
    134        private static void addExpression( int id, String name ) {
    135            ExpressionInfo expressionInfo = new ExpressionInfo( id, name );
    136            names.put( name.toLowerCase(), expressionInfo );
    137            ids.put( new Integer( id ), expressionInfo );
    138        }
    139
    140        private static void buildHashMaps() {
    141            names = new HashMap<String, ExpressionInfo>();
    142            ids = new HashMap<Integer, ExpressionInfo>();
    143            addExpression( EXPRESSION, "Expression" );
    144            addExpression( PROPERTYNAME, "PropertyName" );
    145            addExpression( LITERAL, "Literal" );
    146            addExpression( FUNCTION, "Function" );
    147            addExpression( ADD, "Add" );
    148            addExpression( SUB, "Sub" );
    149            addExpression( MUL, "Mul" );
    150            addExpression( DIV, "Div" );
    151        }
    152    }
    153
    154    class ExpressionInfo {
    155
    156        int id;
    157
    158        String name;
    159
    160        ExpressionInfo( int id, String name ) {
    161            this.id = id;
    162            this.name = name;
    163
    164        }
    165    }