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