001: //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/trunk/src/org/deegree/model/filterencoding/ExpressionDefines.java $
002: /*---------------- FILE HEADER ------------------------------------------
003:
004: This file is part of deegree.
005: Copyright (C) 2001-2008 by:
006: EXSE, Department of Geography, University of Bonn
007: http://www.giub.uni-bonn.de/deegree/
008: lat/lon GmbH
009: http://www.lat-lon.de
010:
011: This library is free software; you can redistribute it and/or
012: modify it under the terms of the GNU Lesser General Public
013: License as published by the Free Software Foundation; either
014: version 2.1 of the License, or (at your option) any later version.
015:
016: This library is distributed in the hope that it will be useful,
017: but WITHOUT ANY WARRANTY; without even the implied warranty of
018: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
019: Lesser General Public License for more details.
020:
021: You should have received a copy of the GNU Lesser General Public
022: License along with this library; if not, write to the Free Software
023: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
024:
025: Contact:
026:
027: Andreas Poth
028: lat/lon GmbH
029: Aennchenstr. 19
030: 53115 Bonn
031: Germany
032: E-Mail: poth@lat-lon.de
033:
034: Prof. Dr. Klaus Greve
035: Department of Geography
036: University of Bonn
037: Meckenheimer Allee 166
038: 53115 Bonn
039: Germany
040: E-Mail: greve@giub.uni-bonn.de
041:
042:
043: ---------------------------------------------------------------------------*/
044: package org.deegree.model.filterencoding;
045:
046: import java.util.HashMap;
047: import java.util.Map;
048:
049: /**
050: * Defines codes and constants for easy coping with the different kinds of Expressions (both
051: * XML-Entities & JavaObjects).
052: *
053: * @author Markus Schneider
054: * @version 06.08.2002
055: */
056: public class ExpressionDefines {
057:
058: // expression codes
059: public static final int EXPRESSION = 0;
060:
061: public static final int PROPERTYNAME = 1;
062:
063: public static final int LITERAL = 2;
064:
065: public static final int FUNCTION = 3;
066:
067: public static final int ADD = 4;
068:
069: public static final int SUB = 5;
070:
071: public static final int MUL = 6;
072:
073: public static final int DIV = 7;
074:
075: public static final int UNKNOWN = -1;
076:
077: /**
078: * Returns the id of an expression for a given name.
079: *
080: * @return EXPRESSION / PROPERTYNAME / LITERAL / ...
081: */
082: public synchronized static int getIdByName(String name) {
083: if (names == null)
084: buildHashMaps();
085: ExpressionInfo expression = names.get(name.toLowerCase());
086: if (expression == null)
087: return UNKNOWN;
088: return expression.id;
089: }
090:
091: /**
092: * Returns the name of an expression for a given id.
093: *
094: * @return null / Name of expression
095: */
096: public static String getNameById(int id) {
097: if (names == null)
098: buildHashMaps();
099: ExpressionInfo expression = ids.get(new Integer(id));
100: if (expression == null)
101: return null;
102: return expression.name;
103: }
104:
105: // used to associate names with the expressions
106: private static Map<String, ExpressionInfo> names = null;
107:
108: // used to associate ids (Integers) with the expressions
109: private static Map<Integer, ExpressionInfo> ids = null;
110:
111: private static void addExpression(int id, String name) {
112: ExpressionInfo expressionInfo = new ExpressionInfo(id, name);
113: names.put(name.toLowerCase(), expressionInfo);
114: ids.put(new Integer(id), expressionInfo);
115: }
116:
117: private static void buildHashMaps() {
118: names = new HashMap<String, ExpressionInfo>();
119: ids = new HashMap<Integer, ExpressionInfo>();
120: addExpression(EXPRESSION, "Expression");
121: addExpression(PROPERTYNAME, "PropertyName");
122: addExpression(LITERAL, "Literal");
123: addExpression(FUNCTION, "Function");
124: addExpression(ADD, "Add");
125: addExpression(SUB, "Sub");
126: addExpression(MUL, "Mul");
127: addExpression(DIV, "Div");
128: }
129: }
130:
131: class ExpressionInfo {
132:
133: int id;
134:
135: String name;
136:
137: ExpressionInfo(int id, String name) {
138: this.id = id;
139: this.name = name;
140:
141: }
142: }
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