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.TreeSet;
011import java.util.regex.Pattern;
012
013import org.openstreetmap.josm.Main;
014import org.openstreetmap.josm.gui.mappaint.mapcss.CSSColors;
015import org.openstreetmap.josm.tools.ColorHelper;
016import org.openstreetmap.josm.tools.Utils;
017
018/**
019 * Simple map of properties with dynamic typing.
020 */
021public final class Cascade implements Cloneable {
022
023    private Map<String, Object> prop = new HashMap<>();
024
025    private boolean defaultSelectedHandling = true;
026
027    private static final Pattern HEX_COLOR_PATTERN = Pattern.compile("#([0-9a-fA-F]{3}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})");
028
029    public <T> T get(String key, T def, Class<T> klass) {
030        return get(key, def, klass, false);
031    }
032
033    /**
034     * Get value for the given key
035     * @param <T> the expected type
036     * @param key the key
037     * @param def default value, can be null
038     * @param klass the same as T
039     * @param suppressWarnings show or don't show a warning when some value is
040     *      found, but cannot be converted to the requested type
041     * @return if a value with class klass has been mapped to key, returns this
042     *      value, def otherwise
043     */
044    public <T> T get(String key, T def, Class<T> klass, boolean suppressWarnings) {
045        if (def != null && !klass.isInstance(def))
046            throw new IllegalArgumentException(def+" is not an instance of "+klass);
047        Object o = prop.get(key);
048        if (o == null)
049            return def;
050        T res = convertTo(o, klass);
051        if (res == null) {
052            if (!suppressWarnings) {
053                Main.warn(String.format("Unable to convert property %s to type %s: found %s of type %s!", key, klass, o, o.getClass()));
054            }
055            return def;
056        } else
057            return res;
058    }
059
060    public Object get(String key) {
061        return prop.get(key);
062    }
063
064    public void put(String key, Object val) {
065        prop.put(key, val);
066    }
067
068    public void putOrClear(String key, Object val) {
069        if (val != null) {
070            prop.put(key, val);
071        } else {
072            prop.remove(key);
073        }
074    }
075
076    public void remove(String key) {
077        prop.remove(key);
078    }
079
080    @SuppressWarnings("unchecked")
081    public static <T> T convertTo(Object o, Class<T> klass) {
082        if (o == null)
083            return null;
084        if (klass.isInstance(o))
085            return (T) o;
086
087        if (klass == float.class || klass == Float.class)
088            return (T) toFloat(o);
089
090        if (klass == double.class || klass == Double.class) {
091            o = toFloat(o);
092            if (o != null) {
093                o = Double.valueOf((Float) o);
094            }
095            return (T) o;
096        }
097
098        if (klass == boolean.class || klass == Boolean.class)
099            return (T) toBool(o);
100
101        if (klass == float[].class)
102            return (T) toFloatArray(o);
103
104        if (klass == Color.class)
105            return (T) toColor(o);
106
107        if (klass == String.class) {
108            if (o instanceof Keyword)
109                return (T) ((Keyword) o).val;
110            if (o instanceof Color) {
111                Color c = (Color) o;
112                int alpha = c.getAlpha();
113                if (alpha != 255)
114                    return (T) String.format("#%06x%02x", ((Color) o).getRGB() & 0x00ffffff, alpha);
115                return (T) String.format("#%06x", ((Color) o).getRGB() & 0x00ffffff);
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('\'' + (String) 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        try {
200            Cascade c = (Cascade) super.clone();
201            @SuppressWarnings({ "unchecked", "rawtypes" })
202            Map<String, Object> clonedProp = (Map<String, Object>) ((HashMap) this.prop).clone();
203            c.prop = clonedProp;
204            return c;
205        } catch (CloneNotSupportedException e) {
206            throw new IllegalStateException(e);
207        }
208    }
209
210    @Override
211    public String toString() {
212        StringBuilder res = new StringBuilder("Cascade{ ");
213        // List properties in alphabetical order to be deterministic, without changing "prop" to a TreeMap
214        // (no reason too, not sure about the potential memory/performance impact of such a change)
215        TreeSet<String> props = new TreeSet<>();
216        for (Entry<String, Object> entry : prop.entrySet()) {
217            StringBuilder sb = new StringBuilder(entry.getKey()).append(':');
218            Object val = entry.getValue();
219            if (val instanceof float[]) {
220                sb.append(Arrays.toString((float[]) val));
221            } else if (val instanceof Color) {
222                sb.append(Utils.toString((Color) val));
223            } else if (val != null) {
224                sb.append(val);
225            }
226            sb.append("; ");
227            props.add(sb.toString());
228        }
229        for (String s : props) {
230            res.append(s);
231        }
232        return res.append('}').toString();
233    }
234
235    public boolean containsKey(String key) {
236        return prop.containsKey(key);
237    }
238
239    public boolean isDefaultSelectedHandling() {
240        return defaultSelectedHandling;
241    }
242
243    public void setDefaultSelectedHandling(boolean defaultSelectedHandling) {
244        this.defaultSelectedHandling = defaultSelectedHandling;
245    }
246}