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A themeable Look and Feel for java swing
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/*
 * MIT License
 *
 * Copyright (c) 2021 Jannis Weis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package com.github.weisj.darklaf.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import javax.swing.*;
import javax.swing.plaf.ActionMapUIResource;

/**
 * An ActionMap that populates its contents as necessary. The contents are populated by invoking the
 * loadActionMap method on the passed in Object.
 *
 * @author Scott Violet
 */
public class LazyActionMap extends ActionMapUIResource {
    /** Object to invoke loadActionMap on. This may be a Class object. */
    private transient Object _loader;

    public LazyActionMap(final Class loader) {
        _loader = loader;
    }

    /**
     * Installs an ActionMap that will be populated by invoking the loadActionMap method on
     * the specified Class when necessary.
     *
     * 
     * This should be used if the ActionMap can be shared.
     *
     * @param c JComponent to install the ActionMap on.
     * @param loaderClass Class object that gets loadActionMap invoked on.
     * @param defaultsKey Key to use to defaults table to check for existing map and what resulting Map
     *        will be registered on.
     */
    public static void installLazyActionMap(final JComponent c, final Class loaderClass, final String defaultsKey) {
        ActionMap map = (ActionMap) UIManager.get(defaultsKey);
        if (map == null) {
            map = new LazyActionMap(loaderClass);
            UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
        }
        SwingUtilities.replaceUIActionMap(c, map);
    }

    /**
     * Returns an ActionMap that will be populated by invoking the loadActionMap method on
     * the specified Class when necessary.
     *
     * 
     * This should be used if the ActionMap can be shared.
     *
     * @param loaderClass Class object that gets loadActionMap invoked on.
     * @param defaultsKey Key to use to defaults table to check for existing map and what resulting Map
     *        will be registered on.
     * @return the action map
     */
    public static ActionMap getActionMap(final Class loaderClass, final String defaultsKey) {
        ActionMap map = (ActionMap) UIManager.get(defaultsKey);
        if (map == null) {
            map = new LazyActionMap(loaderClass);
            UIManager.getLookAndFeelDefaults().put(defaultsKey, map);
        }
        return map;
    }

    public void put(final Action action) {
        put(action.getValue(Action.NAME), action);
    }

    private void loadIfNecessary() {
        if (_loader != null) {
            Object loader = _loader;

            _loader = null;
            Class klass = (Class) loader;
            try {
                Method method = klass.getDeclaredMethod("loadActionMap", LazyActionMap.class);
                method.invoke(klass, this);
            } catch (final NoSuchMethodException nsme) {
                assert false : "LazyActionMap unable to load actions " + klass;
            } catch (IllegalAccessException | InvocationTargetException | IllegalArgumentException iae) {
                assert false : "LazyActionMap unable to load actions " + iae;
            }
        }
    }

    public void setParent(final ActionMap map) {
        loadIfNecessary();
        super.setParent(map);
    }

    public void put(final Object key, final Action action) {
        loadIfNecessary();
        super.put(key, action);
    }

    public Action get(final Object key) {
        loadIfNecessary();
        return super.get(key);
    }

    public void remove(final Object key) {
        loadIfNecessary();
        super.remove(key);
    }

    public void clear() {
        loadIfNecessary();
        super.clear();
    }

    public Object[] keys() {
        loadIfNecessary();
        return super.keys();
    }

    public int size() {
        loadIfNecessary();
        return super.size();
    }

    public Object[] allKeys() {
        loadIfNecessary();
        return super.allKeys();
    }
}