MenuSupport.java

package open.dolphin.helper;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;

/**
 * MenuSupport
 *
 * @author Minagawa,Kazushi
 *
 */
public class MenuSupport implements MenuListener {
    
    private ActionMap actions;
    private Object[] chains;
    
    public MenuSupport(Object owner) {
        Object[] chs = new Object[3];
        chs[1] = MenuSupport.this;
        chs[2] = owner;
        setChains(chs);
    }
    
    @Override
    public void menuSelected(MenuEvent e) {
    }
    
    @Override
    public void menuDeselected(MenuEvent e) {
    }
    
    @Override
    public void menuCanceled(MenuEvent e) {
    }
    
    public void registerActions(ActionMap actions) {
        this.actions = actions;
    }
    
    public Action getAction(String name) {
        if (actions != null) {
            return actions.get(name);
        }
        return null;
    }
    
    public ActionMap getActions() {
        return actions;
    }
    
    public void disableAllMenus() {
        if (actions != null) {
            Object[] keys = actions.keys();
            for (Object o : keys) {
                actions.get(o).setEnabled(false);
            }
        }
    }
    
    public void disableMenus(String[] menus) {
        if (actions != null && menus != null) {
            for (String name : menus) {
                Action action = actions.get(name);
                if (action != null) {
                    action.setEnabled(false);
                }
            }
        }
    }
    
    public void enableMenus(String[] menus) {
        if (actions != null && menus != null) {
            for (String name : menus) {
                Action action = actions.get(name);
                if (action != null) {
                    action.setEnabled(true);
                }
            }
        }
    }
    
    public void enabledAction(String name, boolean enabled) {
        if (actions != null) {
            Action action = actions.get(name);
            if (action != null) {
                action.setEnabled(enabled);
            }
        }
    }
    
    public final void setChains(Object[] chains) {
        this.chains = chains;
    }
    
    public final Object[] getChains() {
        return chains;
    }
    
    public void addChain(Object obj) {
        // 最初のターゲットに設定する
        chains[0] = obj;
    }
    
    public Object getChain() {
        // 最初のターゲットを返す
        return chains[0];
    }
    
    /**
     * chain にそってリフレクションでメソッドを実行する。
     * メソッドを実行するオブジェクトがあればそこで終了する。
     * メソッドを実行するオブジェクトが存在しない場合もそこで終了する。
     * コマンドチェインパターンのリフレクション版。
     * @param method
     * @return メソッドが実行された時 true
     */
    public boolean sendToChain(String method) {
        
        boolean handled = false;
        
        if (chains != null) {
            
            for (Object target : chains) {
                
                if (target != null) {
                    try {
                        Method mth = target.getClass().getMethod(method, (Class[])null);
                        mth.invoke(target, (Object[])null);
                        handled = true;
                        break;
                    } catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                        // この target では実行できない
                    }
                }
            }
        }
        
        return handled;
    }
    
    public boolean sendToChain(String method, String arg) {
        
        boolean handled = false;
        
        if (chains != null) {
            
            for (Object target : chains) {
                
                if (target != null) {
                    try {
                        Method mth = target.getClass().getMethod(method, new Class[]{String.class});
                        mth.invoke(target, new Object[]{arg});
                        handled = true;
                        break;
                    } catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                        // この target では実行できない
                    }
                }
            }
        }
        
        return handled;
    }
    
    
    public void cut() {}
        
    public void copy() {}             
       
    public void paste() {}
}