com.google.code.or.common.glossary.Metadata Maven / Gradle / Ivy

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.google.code.or.common.glossary;

import java.io.IOException;
import java.io.Serializable;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

import com.google.code.or.common.util.CodecUtils;
import com.google.code.or.common.util.MySQLConstants;
import com.google.code.or.io.util.XDeserializer;

/**
 * @author Jingqi Xu
 */
public final class Metadata implements Serializable
{
	//
	private static final long serialVersionUID = 4634414541769527837L;

	//
	private final byte[] type;
	private final int[] metadata;

	/**
	 * 
	 */
	public Metadata(byte[] type, int[] metadata)
	{
		this.type = type;
		this.metadata = metadata;
	}

	/**
	 * 
	 */
	@Override
	public String toString()
	{
		return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE).append("metadata", metadata).toString();
	}

	/**
	 * 
	 */
	public byte getType(int column)
	{
		return this.type[column];
	}

	public int getMetadata(int column)
	{
		return this.metadata[column];
	}

	/**
	 * 
	 */
	public static final Metadata valueOf(byte[] type, byte[] data) throws IOException
	{
		final int[] metadata = new int[type.length];
		final XDeserializer d = new XDeserializer(data);
		for (int i = 0; i < type.length; i++)
		{
			final int t = CodecUtils.toUnsigned(type[i]);
			switch (t)
			{
				case MySQLConstants.TYPE_FLOAT :
				case MySQLConstants.TYPE_DOUBLE :
				case MySQLConstants.TYPE_TINY_BLOB :
				case MySQLConstants.TYPE_BLOB :
				case MySQLConstants.TYPE_MEDIUM_BLOB :
				case MySQLConstants.TYPE_LONG_BLOB :
				case MySQLConstants.TYPE_TIMESTAMP2 :
				case MySQLConstants.TYPE_TIME2 :
				case MySQLConstants.TYPE_DATETIME2 :
					metadata[i] = d.readInt(1);
					break;
				case MySQLConstants.TYPE_BIT :
				case MySQLConstants.TYPE_VARCHAR :
				case MySQLConstants.TYPE_NEWDECIMAL :
					metadata[i] = d.readInt(2); // Little-endian
					break;
				case MySQLConstants.TYPE_SET :
				case MySQLConstants.TYPE_ENUM :
				case MySQLConstants.TYPE_STRING :
					metadata[i] = CodecUtils.toInt(d.readBytes(2), 0, 2); // Big-endian
					break;
				default :
					metadata[i] = 0;
			}
		}
		return new Metadata(type, metadata);
	}
}