com.google.code.or.common.glossary.Metadata.java Source code

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Here is the source code for com.google.code.or.common.glossary.Metadata.java

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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);
    }
}