/*******************************************************************************
 * Copyright (c) 2009, 2011 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 * 
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.common.core.internal.resource.java.binary;

import java.util.Collection;
import java.util.Vector;
import org.eclipse.jdt.core.IField;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jpt.common.core.JptCommonCorePlugin;
import org.eclipse.jpt.common.core.resource.java.JavaResourceAnnotatedElement;
import org.eclipse.jpt.common.core.resource.java.JavaResourceEnum;
import org.eclipse.jpt.common.core.resource.java.JavaResourceEnumConstant;
import org.eclipse.jpt.common.core.resource.java.JavaResourceNode;
import org.eclipse.jpt.common.utility.internal.CollectionTools;
import org.eclipse.jpt.common.utility.internal.iterables.FilteringIterable;
import org.eclipse.jpt.common.utility.internal.iterables.LiveCloneIterable;

/**
 * binary enum
 */
final class BinaryEnum
	extends BinaryAbstractType
	implements JavaResourceEnum
{
	private final Vector<JavaResourceEnumConstant> enumConstants;


	// ********** construction/initialization **********

	BinaryEnum(JavaResourceNode parent, IType type) {
		super(parent, type);
		this.enumConstants = this.buildEnumConstants();
	}

	public Kind getKind() {
		return JavaResourceAnnotatedElement.Kind.ENUM;
	}
	// ********** overrides **********

	@Override
	public void update() {
		super.update();
		this.updateEnumConstants();
	}

	// TODO
	private void updateEnumConstants() {
		throw new UnsupportedOperationException();
	}

	
	// ********** JavaResourceEnum implementation **********


	// ********** enum constants **********

	public Iterable<JavaResourceEnumConstant> getEnumConstants() {
		return new LiveCloneIterable<JavaResourceEnumConstant>(this.enumConstants);
	}

	private void addEnumConstant(JavaResourceEnumConstant enumConstants) {
		this.addItemToCollection(enumConstants, this.enumConstants, ENUMS_COLLECTION);
	}

	private JavaResourceEnumConstant getEnumConstant(String enumConstantName, int occurrence) {
		for (JavaResourceEnumConstant enumConstant : this.getEnumConstants()) {
			if (enumConstant.isFor(enumConstantName, occurrence)) {
				return enumConstant;
			}
		}
		return null;
	}

	private void removeEnumConstants(Collection<JavaResourceEnumConstant> remove) {
		this.removeItemsFromCollection(remove, this.enumConstants, ENUMS_COLLECTION);
	}

	private Vector<JavaResourceEnumConstant> buildEnumConstants() {
		Iterable<IField> jdtEnumConstants = this.getEnumConstants(this.getMember());
		Vector<JavaResourceEnumConstant> result = new Vector<JavaResourceEnumConstant>(CollectionTools.size(jdtEnumConstants));
		for (IField jdtEnumConstant : jdtEnumConstants) {
			result.add(this.buildEnumConstant(jdtEnumConstant));
		}
		return result;
	}

	private Iterable<IField> getEnumConstants(IType type) {
		return new FilteringIterable<IField>(CollectionTools.iterable(this.getFields(type))) {
			@Override
			protected boolean accept(IField jdtField) {
				return isEnumConstant(jdtField);
			}
		};
	}

	private IField[] getFields(IType type) {
		try {
			return type.getFields();
		} catch (JavaModelException ex) {
			JptCommonCorePlugin.log(ex);
			return EMPTY_FIELD_ARRAY;
		}
	}
	private static final IField[] EMPTY_FIELD_ARRAY = new IField[0];

	private boolean isEnumConstant(IField field) {
		try {
			return field.isEnumConstant();
		} catch (JavaModelException ex) {
			JptCommonCorePlugin.log(ex);
			return false;
		}
	}

	private JavaResourceEnumConstant buildEnumConstant(IField jdtEnumConstant) {
		return new BinaryEnumConstant(this, jdtEnumConstant);
	}
}