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Core services for Usergrid system.
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/*******************************************************************************
 * Copyright 2012 Apigee Corporation
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.usergrid.persistence;

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.usergrid.utils.UUIDUtils;

public class Identifier {

	public enum Type {
		UUID, NAME, EMAIL
	}

	final Type type;
	final Object value;

	static Pattern emailRegEx = Pattern
			.compile("[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,4}");
	static Pattern nameRegEx = Pattern.compile("[a-zA-Z0-9_\\-./]*");

	private Identifier(Type type, Object value) {
		this.type = type;
		this.value = value;
	}

	public static Identifier from(Object obj) {
		if (obj == null) {
			return null;
		}
		if (obj instanceof UUID) {
			return new Identifier(Type.UUID, obj);
		}
		if (obj instanceof String) {
			UUID uuid = UUIDUtils.tryGetUUID((String) obj);
			if (uuid != null) {
				return new Identifier(Type.UUID, uuid);
			}
			Matcher m = emailRegEx.matcher((String) obj);
			if (m.matches()) {
				return new Identifier(Type.EMAIL, ((String) obj).toLowerCase());
			}
			m = nameRegEx.matcher((String) obj);
			if (m.matches()) {
				return new Identifier(Type.NAME, ((String) obj).toLowerCase());
			}
		}
		return null;
	}

	public static Identifier fromUUID(UUID uuid) {
		if (uuid == null) {
			return null;
		}
		return new Identifier(Type.UUID, uuid);
	}

	public static Identifier fromName(String name) {
		if (name == null) {
			return null;
		}
		return new Identifier(Type.NAME, name);
	}

	public static Identifier fromEmail(String email) {
		if (email == null) {
			return null;
		}
		return new Identifier(Type.EMAIL, email);
	}

	public UUID getUUID() {
		if (type != Type.UUID) {
			return null;
		}
		return (UUID) value;
	}

	public boolean isUUID() {
		return type == Type.UUID;
	}

	public String getEmail() {
		if (type != Type.EMAIL) {
			return null;
		}
		return (String) value;
	}

	public boolean isEmail() {
		return type == Type.EMAIL;
	}

	public String getName() {
		if (type != Type.NAME) {
			return null;
		}
		return (String) value;
	}

	public boolean isName() {
		return type == Type.NAME;
	}

	@Override
	public String toString() {
		return value.toString();
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((type == null) ? 0 : type.hashCode());
		result = prime * result + ((value == null) ? 0 : value.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (getClass() != obj.getClass()) {
			return false;
		}
		Identifier other = (Identifier) obj;
		if (type != other.type) {
			return false;
		}
		if (value == null) {
			if (other.value != null) {
				return false;
			}
		} else if (!value.equals(other.value)) {
			return false;
		}
		return true;
	}

	public static List fromList(List l) {
		List identifiers = null;
		if ((l != null) && (l.size() > 0)) {
			for (String s : l) {
				Identifier identifier = Identifier.from(s);
				if (identifier != null) {
					if (identifiers == null) {
						identifiers = new ArrayList();
					}
					identifiers.add(identifier);
				}
			}
		}
		return identifiers;
	}

}