/*
 * Copyright 2013 Nokia 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 com.nokia.util.avro.types;

import org.codehaus.jackson.annotate.JsonValue;

import java.util.Collections;
import java.util.Set;

/**
 * Class which represents an Avro primitive type.
 * http://avro.apache.org/docs/current/spec.html#schema_primitive
 *
 * @author Ben Fagin (Nokia)
 * @version 01-12-2012
 */
public class AvroPrimitive extends AvroType {
	public static final AvroPrimitive NULL_TYPE = PrimitiveType.NULL.newInstance();

	public enum PrimitiveType {
		NULL("null", "null"),
		BOOLEAN("boolean", "true"),
		INT("int", "0"),
		LONG("long", "0"),
		FLOAT("float", "0.0"),
		DOUBLE("double", "0.0"),
		STRING("string", ""),
		BYTES("bytes", "\\\\u00FF"),   // this is a byte buffer
		BYTE("int", "0"),              // avro has no concept of a single byte

		;

		public final String name;
		public final String defaultValue;

		PrimitiveType(String name, String defaultValue) {
			this.name = name;
			this.defaultValue = defaultValue;
		}

		public AvroPrimitive newInstance() {
			return new AvroPrimitive(this);
		}
	}

	private String name;

	public AvroPrimitive(PrimitiveType type) {
		this.name = type.name;
		this.defaultValue = type.defaultValue;
	}

	public static AvroPrimitive fromType(String type) {
		PrimitiveType value = null;
		
		for (PrimitiveType primitiveType : PrimitiveType.values()) {
			if (primitiveType.name().equals(type.toUpperCase())) {
				value = primitiveType;
				break;
			}
		}
		
		if (value == null) {
			throw new RuntimeException("unsupported primitive type: " + type);
		}
		
		return new AvroPrimitive(value);
	}	
	
	@JsonValue
	public String getType() {
		return name;
	}

	@Override
	public Set<String> getDependencies() {
		return Collections.emptySet();
	}

	public boolean equalsType(AvroPrimitive other) {
		return this.name.equals(other.name);
	}
}