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JAnnocessor Model Adapter
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/**
 * Copyright 2011 Nikolche Mihajlovski
 *
 * This file is part of JAnnocessor.
 *
 * JAnnocessor is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JAnnocessor is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JAnnocessor.  If not, see .
 */

package org.jannocessor.adapter;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;

import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;

import org.apache.commons.lang.ArrayUtils;
import org.jannocessor.collection.Power;
import org.jannocessor.collection.api.PowerList;
import org.jannocessor.model.CodeNode;
import org.jannocessor.model.JavaElement;
import org.jannocessor.model.JavaElementKind;
import org.jannocessor.model.Name;
import org.jannocessor.model.structure.JavaMetadata;
import org.jannocessor.model.type.JavaType;

public abstract class JavaElementAdapter extends JavaCodeModelAdapter implements
		JavaElement, SourceHolder {

	private static final long serialVersionUID = -6260794797849358247L;

	private final Element element;

	public JavaElementAdapter(Element element, Elements elementUtils,
			Types typeUtils) {
		super(elementUtils, typeUtils);
		this.element = element;
	}

	@Override
	public JavaElement getParent() {
		return retrieveParent();
	}

	@SuppressWarnings("unchecked")
	protected  T retrieveParent() {
		return (T) getElementAdapter(element.getEnclosingElement(),
				JavaElement.class);
	}

	private List getEnclosedElements(Element element) {
		if (element == null) {
			throw new IllegalArgumentException("The element must not be NULL!");
		}

		try {
			// sometimes a strange NPE arises here, it's probably a bug
			return element.getEnclosedElements();
		} catch (Exception e) {
			return new ArrayList();
		}
	}

	protected PowerList getEnclosedElements() {
		PowerList enclosedElements = Power.list();

		for (Element enclosedElement : getEnclosedElements(element)) {
			enclosedElements.add(getElementAdapter(enclosedElement,
					JavaElement.class));
		}

		return enclosedElements;
	}

	@Override
	public Name getName() {
		return getNameAdapter(element.getSimpleName().toString());
	}

	@Override
	public Element retrieveSourceElement() {
		return element;
	}

	@Override
	public JavaType getType() {
		return getTypeAdapter(element.asType());
	}

	@SuppressWarnings("unchecked")
	protected  PowerList findChildrenByType(Class clazz) {
		PowerList results = Power.list();

		for (CodeNode child : getEnclosedElements()) {
			if (clazz.isAssignableFrom(child.getClass())) {
				results.add((T) child);
			}
		}

		return results;
	}

	@SuppressWarnings("unchecked")
	protected > T[] getModifierValues(Class enumType,
			String... exceptValues) {
		Set modifiers = element.getModifiers();
		T[] values = (T[]) Array.newInstance(enumType, modifiers.size());

		int index = 0;
		for (Modifier modifier : modifiers) {
			if (!ArrayUtils.contains(exceptValues, modifier.name())) {
				values[index++] = Enum.valueOf(enumType, modifier.name());
			}
		}

		if (index < values.length) {
			// if some modifier was filtered out, cut the array
			values = Arrays.copyOf(values, index);
		}

		return values;
	}

	@Override
	public JavaElementKind getKind() {
		String kindName = element.getKind().toString();
		if (kindName.equals("ANNOTATION_TYPE")) {
			kindName = "ANNOTATION";
		}

		JavaElementKind kind = JavaElementKind.valueOf(kindName);

		switch (kind) {
		case CLASS:
		case INTERFACE:
		case ENUM:
		case ANNOTATION:
			kind = JavaElementKind.valueOf("NESTED_" + kindName);
			break;
		}

		return kind;
	}

	protected PowerList getAnnotatedMetadata() {
		PowerList results = Power.list();

		for (AnnotationMirror annotationMirror : element.getAnnotationMirrors()) {
			results.add(getMetadataAdapter(annotationMirror));
		}

		return results;
	}

	@Override
	protected Class getAdaptedInterface() {
		return JavaElement.class;
	}

	@Override
	public JavaElement copy() {
		throw calculatedMethodException();
	}

}