001 // License: GPL. For details, see LICENSE file.
002 package org.openstreetmap.josm.gui.mappaint;
003
004 import static org.openstreetmap.josm.tools.Utils.equal;
005
006 import java.awt.Color;
007 import java.util.Arrays;
008 import java.util.HashMap;
009 import java.util.List;
010 import java.util.Map;
011
012 import org.openstreetmap.josm.gui.mappaint.mapcss.CSSColors;
013 import org.openstreetmap.josm.tools.Utils;
014
015 /**
016 * Simple map of properties with dynamic typing.
017 */
018 public class Cascade implements Cloneable {
019
020 public static final Cascade EMPTY_CASCADE = new Cascade();
021
022 protected Map<String, Object> prop = new HashMap<String, Object>();
023
024 public <T> T get(String key, T def, Class<T> klass) {
025 return get(key, def, klass, false);
026 }
027
028 /**
029 * Get value for the given key
030 * @param key the key
031 * @param def default value, can be null
032 * @param klass the same as T
033 * @param suppressWarnings show or don't show a warning when some value is
034 * found, but cannot be converted to the requested type
035 * @return if a value with class klass has been mapped to key, returns this
036 * value, def otherwise
037 */
038 public <T> T get(String key, T def, Class<T> klass, boolean suppressWarnings) {
039 if (def != null && !klass.isInstance(def))
040 throw new IllegalArgumentException();
041 Object o = prop.get(key);
042 if (o == null)
043 return def;
044 T res = convertTo(o, klass);
045 if (res == null) {
046 if (!suppressWarnings) {
047 System.err.println(String.format("Warning: unable to convert property %s to type %s: found %s of type %s!", key, klass, o, o.getClass()));
048 }
049 return def;
050 } else
051 return res;
052 }
053
054 public Object get(String key) {
055 return prop.get(key);
056 }
057
058 public void put(String key, Object val) {
059 prop.put(key, val);
060 }
061
062 public void putOrClear(String key, Object val) {
063 if (val != null) {
064 prop.put(key, val);
065 } else {
066 prop.remove(key);
067 }
068 }
069
070 public void remove(String key) {
071 prop.remove(key);
072 }
073
074 @SuppressWarnings("unchecked")
075 public static <T> T convertTo(Object o, Class<T> klass) {
076 if (o == null)
077 return null;
078 if (klass.isInstance(o))
079 return (T) o;
080
081 if (klass == float.class || klass == Float.class)
082 return (T) toFloat(o);
083
084 if (klass == double.class || klass == Double.class) {
085 o = toFloat(o);
086 if (o != null) {
087 o = new Double((Float) o);
088 }
089 return (T) o;
090 }
091
092 if (klass == boolean.class || klass == Boolean.class)
093 return (T) toBool(o);
094
095 if (klass == float[].class)
096 return (T) toFloatArray(o);
097
098 if (klass == Color.class)
099 return (T) toColor(o);
100
101 if (klass == String.class) {
102 if (o instanceof Keyword)
103 return (T) ((Keyword) o).val;
104
105 return (T) o.toString();
106 }
107
108 return null;
109 }
110
111 private static Float toFloat(Object o) {
112 if (o instanceof Float)
113 return (Float) o;
114 if (o instanceof Double)
115 return new Float((Double) o);
116 if (o instanceof Integer)
117 return new Float((Integer) o);
118 if (o instanceof String) {
119 try {
120 float f = Float.parseFloat((String) o);
121 return f;
122 } catch (NumberFormatException e) {
123 }
124 }
125 return null;
126 }
127
128 private static Boolean toBool(Object o) {
129 if (o instanceof Boolean)
130 return (Boolean) o;
131 if (o instanceof Keyword) {
132 String s = ((Keyword) o).val;
133 if (equal(s, "true") || equal(s, "yes"))
134 return true;
135 if (equal(s, "false") || equal(s, "no"))
136 return false;
137 }
138 return null;
139 }
140
141 private static float[] toFloatArray(Object o) {
142 if (o instanceof float[])
143 return (float[]) o;
144 if (o instanceof List) {
145 List l = (List) o;
146 float[] a = new float[l.size()];
147 for (int i=0; i<l.size(); ++i) {
148 Float f = toFloat(l.get(i));
149 if (f == null)
150 return null;
151 else
152 a[i] = f;
153 }
154 return a;
155 }
156 Float f = toFloat(o);
157 if (f != null)
158 return new float[] { f };
159 return null;
160 }
161
162 private static Color toColor(Object o) {
163 if (o instanceof Color)
164 return (Color) o;
165 if (o instanceof Keyword)
166 return CSSColors.get(((Keyword) o).val);
167 return null;
168 }
169
170 @Override
171 public Cascade clone() {
172 @SuppressWarnings("unchecked")
173 HashMap<String, Object> clonedProp = (HashMap) ((HashMap) this.prop).clone();
174 Cascade c = new Cascade();
175 c.prop = clonedProp;
176 return c;
177 }
178
179 @Override
180 public String toString() {
181 StringBuilder res = new StringBuilder("Cascade{ ");
182 for (String key : prop.keySet()) {
183 res.append(key+":");
184 Object val = prop.get(key);
185 if (val instanceof float[]) {
186 res.append(Arrays.toString((float[]) val));
187 } else if (val instanceof Color) {
188 res.append(Utils.toString((Color)val));
189 } else {
190 res.append(val+"");
191 }
192 res.append("; ");
193 }
194 return res.append("}").toString();
195 }
196
197 public boolean containsKey(String key) {
198 return prop.containsKey(key);
199 }
200 }