| /************************************************************** |
| * |
| * 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. |
| * |
| *************************************************************/ |
| |
| |
| |
| import java.io.OutputStream; |
| import java.io.InputStream; |
| import java.io.DataOutputStream; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| |
| /** |
| * <p>Contains the raw bytes for a record in a pdb.</p> |
| * |
| * <p>Note that it is not associated with a record number or id.</p> |
| * |
| * @author Akhil Arora, Herbie Ong |
| * @see PalmDB |
| */ |
| |
| |
| public final class Record { |
| |
| /** record bytes */ |
| private byte[] data; |
| |
| /** |
| * Default constructor. |
| */ |
| |
| public Record() { |
| |
| data = new byte[0]; |
| } |
| |
| /** |
| * Constructor to create a Record filled with bytes. |
| * Note that this does not check for 64k record sizes. |
| * User of this class has to check for that. |
| * |
| * @param d byte array contents for this object. |
| */ |
| |
| public Record(byte[] d) { |
| |
| data = new byte[d.length]; |
| System.arraycopy(d, 0, data, 0, d.length); |
| } |
| |
| /** |
| * This method returns the number of bytes in this object. |
| * |
| * @return int number of bytes in this object. |
| */ |
| |
| public int getSize() { |
| |
| return data.length; |
| } |
| |
| /** |
| * This method returns the contents of this object. |
| * |
| * @return byte[] contents in byte array |
| */ |
| |
| public byte[] getBytes() { |
| |
| return data; |
| } |
| |
| /** |
| * Write out the record length followed by the data |
| * in this Record object. |
| * |
| * @param out the stream to write the object to |
| * @throws IOException if any I/O error occurs |
| */ |
| |
| |
| public void write(OutputStream outs) throws IOException { |
| |
| DataOutputStream out = new DataOutputStream(outs); |
| out.writeShort(data.length); |
| out.write(data); |
| } |
| |
| /** |
| * Read the necessary data to create a pdb from |
| * the input stream. |
| * |
| * @param in the stream to read data from in order to |
| * restore the object |
| * @throws IOException if any I/O error occurs |
| */ |
| |
| public void read(InputStream ins) throws IOException { |
| |
| DataInputStream in = new DataInputStream(ins); |
| int len = in.readUnsignedShort(); |
| data = new byte[len]; |
| in.readFully(data); |
| } |
| |
| /** |
| * Override equals method of Object. |
| * |
| * 2 Record objects are equal if they contain the same bytes |
| * in the array. |
| * |
| * This is used primarily for testing purposes only for now. |
| * |
| * @param obj a Record object to compare with |
| * @return boolean true if obj is equal to this, else false. |
| */ |
| |
| public boolean equals(Object obj) { |
| |
| boolean bool = false; |
| |
| if (obj instanceof Record) { |
| |
| Record rec = (Record) obj; |
| |
| checkLabel: { |
| |
| if (rec.getSize() == data.length) { |
| |
| for (int i = 0; i < data.length; i++) { |
| |
| if (data[i] != rec.data[i]) { |
| break checkLabel; |
| } |
| } |
| |
| bool = true; |
| } |
| } |
| } |
| |
| return bool; |
| } |
| } |