001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.gui.mappaint;
003
004import static org.openstreetmap.josm.tools.Utils.equal;
005
006import java.awt.Color;
007import java.util.Arrays;
008import java.util.HashMap;
009import java.util.List;
010import java.util.Map;
011import java.util.regex.Pattern;
012
013import org.openstreetmap.josm.Main;
014import org.openstreetmap.josm.gui.mappaint.mapcss.CSSColors;
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    protected Map<String, Object> prop = new HashMap<String, Object>();
025
026    private final static Pattern HEX_COLOR_PATTERN = Pattern.compile("#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})");
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();
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
110            return (T) o.toString();
111        }
112
113        return null;
114    }
115
116    private static Float toFloat(Object o) {
117        if (o instanceof Float)
118            return (Float) o;
119        if (o instanceof Double)
120            return new Float((Double) o);
121        if (o instanceof Integer)
122            return new Float((Integer) o);
123        if (o instanceof String && !((String) o).isEmpty()) {
124            try {
125                return Float.parseFloat((String) o);
126            } catch (NumberFormatException e) {
127                Main.debug("'"+o+"' cannot be converted to float");
128            }
129        }
130        return null;
131    }
132
133    private static Boolean toBool(Object o) {
134        if (o instanceof Boolean)
135            return (Boolean) o;
136        if (o instanceof Keyword) {
137            String s = ((Keyword) o).val;
138            if (equal(s, "true") || equal(s, "yes"))
139                return true;
140            if (equal(s, "false") || equal(s, "no"))
141                return false;
142        }
143        return null;
144    }
145
146    private static float[] toFloatArray(Object o) {
147        if (o instanceof float[])
148            return (float[]) o;
149        if (o instanceof List) {
150            List<?> l = (List<?>) o;
151            float[] a = new float[l.size()];
152            for (int i=0; i<l.size(); ++i) {
153                Float f = toFloat(l.get(i));
154                if (f == null)
155                    return null;
156                else
157                    a[i] = f;
158            }
159            return a;
160        }
161        Float f = toFloat(o);
162        if (f != null)
163            return new float[] { f };
164        return null;
165    }
166
167    private static Color toColor(Object o) {
168        if (o instanceof Color)
169            return (Color) o;
170        if (o instanceof Keyword)
171            return CSSColors.get(((Keyword) o).val);
172        if (o instanceof String) {
173            Color c = CSSColors.get((String) o);
174            if (c != null)
175                return c;
176            if (HEX_COLOR_PATTERN.matcher((String) o).matches()) {
177                return Utils.hexToColor((String) o);
178            }
179        }
180        return null;
181    }
182
183    @Override
184    public Cascade clone() {
185        @SuppressWarnings("unchecked")
186        HashMap<String, Object> clonedProp = (HashMap) ((HashMap) this.prop).clone();
187        Cascade c = new Cascade();
188        c.prop = clonedProp;
189        return c;
190    }
191
192    @Override
193    public String toString() {
194        StringBuilder res = new StringBuilder("Cascade{ ");
195        for (String key : prop.keySet()) {
196            res.append(key+":");
197            Object val = prop.get(key);
198            if (val instanceof float[]) {
199                res.append(Arrays.toString((float[]) val));
200            } else if (val instanceof Color) {
201                res.append(Utils.toString((Color)val));
202            } else {
203                res.append(val+"");
204            }
205            res.append("; ");
206        }
207        return res.append("}").toString();
208    }
209
210    public boolean containsKey(String key) {
211        return prop.containsKey(key);
212    }
213}