ChangeMap

java.lang.Object
- db.buffers.ChangeMap

```
public class ChangeMap
extends java.lang.Object
```
ChangeMap facilitates the decoding of change-data to determine if a specific buffer was modified by the corresponding buffer file version.

See Also:

ChangeMapFile

Constructor Summary

Constructors
Constructor Description

ChangeMap(byte[] mapData)
Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`containsIndex(int index)`	Returns true if the specified index is within the bounds of this map.
`byte[]`	`getData()`	Get the underlying change map data as a byte array
`boolean`	`hasChanged(int index)`	Returns true if the change map data indicates that the specified buffer has been modified.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ChangeMap
```
public ChangeMap(byte[] mapData)
```
    Constructor.
    
    Parameters:
    
    mapData - change map data
- Method Detail
  - getData
```
public byte[] getData()
```
    Get the underlying change map data as a byte array
    
    Returns:
    
    change map data
  - hasChanged
```
public boolean hasChanged(int index)
```
    Returns true if the change map data indicates that the specified buffer has been modified.
    
    Parameters:
    
    index - buffer index
  - containsIndex
```
public boolean containsIndex(int index)
```
    Returns true if the specified index is within the bounds of this map.