NodeParser.java

package com.mattc.autotyper.meta;

import javafx.scene.Node;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleButton;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.common.reflect.ClassPath;
import com.google.common.reflect.ClassPath.ClassInfo;
import com.mattc.autotyper.util.Console;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

@FXCompatible
public class NodeParser {

    private static final BiMap<String, Class<? extends Node>> nodeMap = HashBiMap.create();

    static {

        try {
            findParseableNodes(nodeMap);
        } catch (final ClassNotFoundException e) {
            Console.exception(e);
        }

        // Non-API Parseables
        nodeMap.put("%b", Button.class);
        nodeMap.put("%t", TextField.class);
        nodeMap.put("%c", ComboBox.class);
        nodeMap.put("%B", ToggleButton.class);
    }

    public List<Node> parse(String format) {
        final Scanner scan = new Scanner(format);
        final List<Node> nodes = Lists.newArrayList();
        final StringBuilder sb = new StringBuilder();

        while (scan.hasNext()) {
            final String temp = scan.next();

            if (nodeMap.containsKey(temp)) {
                try {
                    nodes.add(new Label(sb.append(" ").toString()));
                    nodes.add(createInstanceOf(nodeMap.get(temp)));
                    nodes.add(new Label(" "));
                    sb.setLength(0);
                    sb.trimToSize();
                } catch (InstantiationException | IllegalAccessException e) {
                    Console.exception(e);
                }
            } else if (temp.startsWith("%")) {
                scan.close();
                throw new IllegalStateException("Tag is in Tag Format but is not a VALID Tag! -- " + temp);
            } else {
                sb.append(temp).append(" ");
            }
        }

        nodes.add(new Label(sb.toString()));

        scan.close();
        return nodes;
    }

    private Node createInstanceOf(Class<? extends Node> klass) throws InstantiationException, IllegalAccessException {
        try {
            boolean unlocked = false;
            final Constructor<? extends Node> con = klass.getDeclaredConstructor();
            if ((unlocked = !con.isAccessible())) {
                con.setAccessible(true);
            }
            con.setAccessible(true);
            final Node val = con.newInstance();
            if (unlocked) {
                con.setAccessible(false);
            }

            return val;
        } catch (IllegalArgumentException | InvocationTargetException | NoSuchMethodException | SecurityException e) {
            throw new IllegalArgumentException("No Private/Protected/Public No-Arg Constructor to Initialize!", e);
        }
    }

    @SuppressWarnings("unchecked")
    private static final void findParseableNodes(Map<String, Class<? extends Node>> map) throws ClassNotFoundException {

        try {
            final ImmutableSet<ClassInfo> klasses = ClassPath.from(ClassLoader.getSystemClassLoader()).getTopLevelClassesRecursive("com.mattc");

            for (final ClassInfo ci : klasses) {
                final Class<?> klass = Class.forName(ci.getName());

                final FXParseable anno = klass.getAnnotation(FXParseable.class);
                if ((anno != null) && !Node.class.isAssignableFrom(klass))
                    throw new IllegalStateException("Non-Parseable Class tagged with @FXParseable! A Parseable Class is one that inherits of Node...");
                if ((anno == null) || !Node.class.isAssignableFrom(klass)) {
                    continue;
                }

                String tag = anno.value();

                if (tag.equals(FXParseable.NO_VAL)) {
                    tag = NodeParser.createTagFor(klass);
                } else if (!tag.startsWith("%"))
                    throw new IllegalArgumentException("Attempted to set tag to " + tag + " but a tag must start with a '%'!");
                else if (map.containsKey(tag))
                    throw new IllegalArgumentException("Attempt to set tag to " + tag + " for " + klass.getSimpleName() + " but it conflicts with another tag!");

                Console.info("Add FXParseable " + ci.getName() + " as " + tag);
                map.put(tag, (Class<? extends Node>) klass);
            }

        } catch (final IOException e) {
            Console.exception(e);
        }

    }

    public static final String createTagFor(Class<?> klass) {
        final char[] name = klass.getSimpleName().toCharArray();
        final StringBuilder sb = new StringBuilder("%");

        for (final char c : name)
            if (Character.isUpperCase(c)) {
                sb.append(c);
            }

        return sb.toString().toLowerCase();
    }

    public static final Class<? extends Node> getClassFor(String tag) {
        return nodeMap.get(tag);
    }

    public static final String getTagFor(Class<? extends Node> klass) {
        return nodeMap.inverse().get(klass);
    }

}