View (Exonum Java Binding: Core 0.4.0 API)

java.lang.Object
- com.exonum.binding.proxy.AbstractNativeProxy
- - com.exonum.binding.storage.database.View

Direct Known Subclasses:

Fork, Snapshot
```
public abstract class View
extends AbstractNativeProxy
```
Represents a view of a database.
There are two sub-types:
- A snapshot, which is a read-only view.
- A fork, which is a read-write view.
As in some cases the clients need to detect any changes made to a database, a view also holds a modification counter, which any clients changing the database state must notify.
See Also:

Snapshot, Fork

Field Summary
- Fields inherited from class com.exonum.binding.proxy.AbstractNativeProxy
  nativeHandle

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`canModify()`	Returns true if this view allows modifications to the database state; false if it is immutable.
`Cleaner`	`getCleaner()`	Returns the cleaner of this view.
`ModificationCounter`	`getModificationCounter()`	Returns a modification counter, corresponding to this view.
`long`	`getViewNativeHandle()`	Returns a native handle of this view.

Methods inherited from class com.exonum.binding.proxy.AbstractNativeProxy
getNativeHandle, isValidHandle

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

- Method Detail
  - canModify
```
public boolean canModify()
```
    Returns true if this view allows modifications to the database state; false if it is immutable.
  - getViewNativeHandle
```
public long getViewNativeHandle()
```
    Returns a native handle of this view.
    
    Throws:
    
    java.lang.IllegalStateException - if the view is invalid (closed or nullptr)
  - getCleaner
```
public Cleaner getCleaner()
```
    Returns the cleaner of this view.
  - getModificationCounter
```
public ModificationCounter getModificationCounter()
```
    Returns a modification counter, corresponding to this view. The clients, trying to modify a collection using this view, must notify the counter first.