001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.gui.mappaint;
003
004import java.awt.Color;
005import java.util.Arrays;
006import java.util.HashMap;
007import java.util.List;
008import java.util.Map;
009import java.util.Map.Entry;
010import java.util.regex.Pattern;
011
012import org.openstreetmap.josm.Main;
013import org.openstreetmap.josm.gui.mappaint.mapcss.CSSColors;
014import org.openstreetmap.josm.tools.ColorHelper;
015import org.openstreetmap.josm.tools.Utils;
016
017/**
018 * Simple map of properties with dynamic typing.
019 */
020public final class Cascade implements Cloneable {
021
022    public static final Cascade EMPTY_CASCADE = new Cascade();
023
024    private Map<String, Object> prop = new HashMap<>();
025
026    private boolean defaultSelectedHandling = true;
027
028    private static final Pattern HEX_COLOR_PATTERN = Pattern.compile("#([0-9a-fA-F]{3}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})");
029
030    public <T> T get(String key, T def, Class<T> klass) {
031        return get(key, def, klass, false);
032    }
033
034    /**
035     * Get value for the given key
036     * @param <T> the expected type
037     * @param key the key
038     * @param def default value, can be null
039     * @param klass the same as T
040     * @param suppressWarnings show or don't show a warning when some value is
041     *      found, but cannot be converted to the requested type
042     * @return if a value with class klass has been mapped to key, returns this
043     *      value, def otherwise
044     */
045    public <T> T get(String key, T def, Class<T> klass, boolean suppressWarnings) {
046        if (def != null && !klass.isInstance(def))
047            throw new IllegalArgumentException(def+" is not an instance of "+klass);
048        Object o = prop.get(key);
049        if (o == null)
050            return def;
051        T res = convertTo(o, klass);
052        if (res == null) {
053            if (!suppressWarnings) {
054                Main.warn(String.format("Unable to convert property %s to type %s: found %s of type %s!", key, klass, o, o.getClass()));
055            }
056            return def;
057        } else
058            return res;
059    }
060
061    public Object get(String key) {
062        return prop.get(key);
063    }
064
065    public void put(String key, Object val) {
066        prop.put(key, val);
067    }
068
069    public void putOrClear(String key, Object val) {
070        if (val != null) {
071            prop.put(key, val);
072        } else {
073            prop.remove(key);
074        }
075    }
076
077    public void remove(String key) {
078        prop.remove(key);
079    }
080
081    @SuppressWarnings("unchecked")
082    public static <T> T convertTo(Object o, Class<T> klass) {
083        if (o == null)
084            return null;
085        if (klass.isInstance(o))
086            return (T) o;
087
088        if (klass == float.class || klass == Float.class)
089            return (T) toFloat(o);
090
091        if (klass == double.class || klass == Double.class) {
092            o = toFloat(o);
093            if (o != null) {
094                o = new Double((Float) o);
095            }
096            return (T) o;
097        }
098
099        if (klass == boolean.class || klass == Boolean.class)
100            return (T) toBool(o);
101
102        if (klass == float[].class)
103            return (T) toFloatArray(o);
104
105        if (klass == Color.class)
106            return (T) toColor(o);
107
108        if (klass == String.class) {
109            if (o instanceof Keyword)
110                return (T) ((Keyword) o).val;
111            if (o instanceof Color) {
112                Color c = (Color) o;
113                int alpha = c.getAlpha();
114                if (alpha != 255)
115                    return (T) String.format("#%06x%02x", ((Color) o).getRGB() & 0x00ffffff, alpha);
116                return (T) String.format("#%06x", ((Color) o).getRGB() & 0x00ffffff);
117
118            }
119
120            return (T) o.toString();
121        }
122
123        return null;
124    }
125
126    private static Float toFloat(Object o) {
127        if (o instanceof Number)
128            return ((Number) o).floatValue();
129        if (o instanceof String && !((String) o).isEmpty()) {
130            try {
131                return Float.valueOf((String) o);
132            } catch (NumberFormatException e) {
133                if (Main.isDebugEnabled()) {
134                    Main.debug("'"+o+"' cannot be converted to float");
135                }
136            }
137        }
138        return null;
139    }
140
141    private static Boolean toBool(Object o) {
142        if (o instanceof Boolean)
143            return (Boolean) o;
144        String s = null;
145        if (o instanceof Keyword) {
146            s = ((Keyword) o).val;
147        } else if (o instanceof String) {
148            s = (String) o;
149        }
150        if (s != null)
151            return !(s.isEmpty() || "false".equals(s) || "no".equals(s) || "0".equals(s) || "0.0".equals(s));
152        if (o instanceof Number)
153            return ((Number) o).floatValue() != 0;
154        if (o instanceof List)
155            return !((List) o).isEmpty();
156        if (o instanceof float[])
157            return ((float[]) o).length != 0;
158
159        return null;
160    }
161
162    private static float[] toFloatArray(Object o) {
163        if (o instanceof float[])
164            return (float[]) o;
165        if (o instanceof List) {
166            List<?> l = (List<?>) o;
167            float[] a = new float[l.size()];
168            for (int i = 0; i < l.size(); ++i) {
169                Float f = toFloat(l.get(i));
170                if (f == null)
171                    return null;
172                else
173                    a[i] = f;
174            }
175            return a;
176        }
177        Float f = toFloat(o);
178        if (f != null)
179            return new float[] {f};
180        return null;
181    }
182
183    private static Color toColor(Object o) {
184        if (o instanceof Color)
185            return (Color) o;
186        if (o instanceof Keyword)
187            return CSSColors.get(((Keyword) o).val);
188        if (o instanceof String) {
189            Color c = CSSColors.get((String) o);
190            if (c != null)
191                return c;
192            if (HEX_COLOR_PATTERN.matcher((String) o).matches()) {
193                return ColorHelper.html2color((String) o);
194            }
195        }
196        return null;
197    }
198
199    @Override
200    public Cascade clone() {
201        @SuppressWarnings("unchecked")
202        Map<String, Object> clonedProp = (Map<String, Object>) ((HashMap) this.prop).clone();
203        Cascade c = new Cascade();
204        c.prop = clonedProp;
205        return c;
206    }
207
208    @Override
209    public String toString() {
210        StringBuilder res = new StringBuilder("Cascade{ ");
211        for (Entry<String, Object> entry : prop.entrySet()) {
212            res.append(entry.getKey()+':');
213            Object val = entry.getValue();
214            if (val instanceof float[]) {
215                res.append(Arrays.toString((float[]) val));
216            } else if (val instanceof Color) {
217                res.append(Utils.toString((Color) val));
218            } else if (val != null) {
219                res.append(val);
220            }
221            res.append("; ");
222        }
223        return res.append('}').toString();
224    }
225
226    public boolean containsKey(String key) {
227        return prop.containsKey(key);
228    }
229
230    public boolean isDefaultSelectedHandling() {
231        return defaultSelectedHandling;
232    }
233
234    public void setDefaultSelectedHandling(boolean defaultSelectedHandling) {
235        this.defaultSelectedHandling = defaultSelectedHandling;
236    }
237}