Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [T Extensions 3](https://developer.android.com/sdkExtensions) Summary: [Ctors](https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#pubctors) \| [Methods](https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#inhmethods)

# DocumentChangeInfo

*** ** * ** ***

[Kotlin](https://developer.android.com/reference/kotlin/android/app/appsearch/observer/DocumentChangeInfo "View this page in Kotlin") \|Java


`
public

final

class
DocumentChangeInfo
`


`

extends https://developer.android.com/reference/java/lang/Object


`

`


`

|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.app.appsearch.observer.DocumentChangeInfo |

<br />

*** ** * ** ***

Contains information about an individual change detected by an `https://developer.android.com/reference/android/app/appsearch/observer/ObserverCallback`.

This class reports information about document changes, that is, when documents were added,
updated or removed.

Changes are grouped by package, database, schema type and namespace. Each unique combination
of these items will generate a unique `https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo`.

Notifications are only sent for documents whose schema type matches an observer's schema
filters (as determined by `https://developer.android.com/reference/android/app/appsearch/observer/ObserverSpec#getFilterSchemas()`).

Note that document changes that happen during schema migration from calling `https://developer.android.com/reference/android/app/appsearch/AppSearchSession#setSchema(android.app.appsearch.SetSchemaRequest,%20java.util.concurrent.Executor,%20java.util.concurrent.Executor,%20java.util.function.Consumer<android.app.appsearch.AppSearchResult<android.app.appsearch.SetSchemaResponse>>)` are not reported via this class. Such changes
are reported through `https://developer.android.com/reference/android/app/appsearch/observer/SchemaChangeInfo`.

## Summary

| ### Public constructors ||
|---|---|
| ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#DocumentChangeInfo(java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String,%20java.util.Set<java.lang.String>)(https://developer.android.com/reference/java/lang/String packageName, https://developer.android.com/reference/java/lang/String database, https://developer.android.com/reference/java/lang/String namespace, https://developer.android.com/reference/java/lang/String schemaName, https://developer.android.com/reference/java/util/Set<https://developer.android.com/reference/java/lang/String> changedDocumentIds) ` Constructs a new `https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo`. |

| ### Public methods ||
|---|---|
| ` boolean` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object o) ` Indicates whether some other object is "equal to" this one. |
| ` https://developer.android.com/reference/java/util/Set<https://developer.android.com/reference/java/lang/String>` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#getChangedDocumentIds()() ` Returns the set of document IDs that have been changed as part of this notification. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#getDatabaseName()() ` Returns the database in which the documents that was changed reside. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#getNamespace()() ` Returns the namespace of the documents that changed. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#getPackageName()() ` Returns the package name of the app which owns the documents that changed. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#getSchemaName()() ` Returns the name of the schema type that contains the changed documents. |
| ` int` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#hashCode()() ` Returns a hash code value for the object. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo#toString()() ` Returns a string representation of the object. |

| ### Inherited methods |
|---|---|
| From class ` https://developer.android.com/reference/java/lang/Object ` |---|---| | ` https://developer.android.com/reference/java/lang/Object` | ` https://developer.android.com/reference/java/lang/Object#clone()() ` Creates and returns a copy of this object. | | ` boolean` | ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` https://developer.android.com/reference/java/lang/Object#finalize()() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final https://developer.android.com/reference/java/lang/Class<?>` | ` https://developer.android.com/reference/java/lang/Object#getClass()() ` Returns the runtime class of this `Object`. | | ` int` | ` https://developer.android.com/reference/java/lang/Object#hashCode()() ` Returns a hash code value for the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notify()() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#notifyAll()() ` Wakes up all threads that are waiting on this object's monitor. | | ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/java/lang/Object#toString()() ` Returns a string representation of the object. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` https://developer.android.com/reference/java/lang/Object#wait()() ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*. | ||

## Public constructors

### DocumentChangeInfo

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [T Extensions 3](https://developer.android.com/sdkExtensions)

```
public DocumentChangeInfo (String packageName, 
                String database, 
                String namespace, 
                String schemaName, 
                Set<String> changedDocumentIds)
```

Constructs a new `https://developer.android.com/reference/android/app/appsearch/observer/DocumentChangeInfo`.

<br />

| Parameters ||
|---|---|
| `packageName` | `String`: The package name of the app which owns the documents that changed. This value cannot be `null`. <br /> |
| `database` | `String`: The database in which the documents that changed reside. This value cannot be `null`. <br /> |
| `namespace` | `String`: The namespace in which the documents that changed reside. This value cannot be `null`. <br /> |
| `schemaName` | `String`: The name of the schema type that contains the changed documents. This value cannot be `null`. <br /> |
| `changedDocumentIds` | `Set`: The set of document IDs that have been changed as part of this notification. This value cannot be `null`. <br /> |

## Public methods

### equals

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public boolean equals (Object o)
```

Indicates whether some other object is "equal to" this one.


The `equals` method implements an equivalence relation
on non-null object references:

- It is *reflexive*: for any non-null reference value `x`, `x.equals(x)` should return `true`.
- It is *symmetric*: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`.
- It is *transitive*: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`.
- It is *consistent*: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified.
- For any non-null reference value `x`, `x.equals(null)` should return `false`.


An equivalence relation partitions the elements it operates on
into *equivalence classes*; all the members of an
equivalence class are equal to each other. Members of an
equivalence class are substitutable for each other, at least
for some purposes.

<br />

| Parameters ||
|---|---|
| `o` | `Object`: This value may be `null`. <br /> |

| Returns ||
|---|---|
| `boolean` | `true` if this object is the same as the obj argument; `false` otherwise. <br /> |

### getChangedDocumentIds

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [T Extensions 3](https://developer.android.com/sdkExtensions)

```
public Set<String> getChangedDocumentIds ()
```

Returns the set of document IDs that have been changed as part of this notification.

This will never be empty.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Set<https://developer.android.com/reference/java/lang/String>` | This value cannot be `null`. <br /> |

### getDatabaseName

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [T Extensions 3](https://developer.android.com/sdkExtensions)

```
public String getDatabaseName ()
```

Returns the database in which the documents that was changed reside.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | This value cannot be `null`. <br /> |

### getNamespace

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [T Extensions 3](https://developer.android.com/sdkExtensions)

```
public String getNamespace ()
```

Returns the namespace of the documents that changed.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | This value cannot be `null`. <br /> |

### getPackageName

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [T Extensions 3](https://developer.android.com/sdkExtensions)

```
public String getPackageName ()
```

Returns the package name of the app which owns the documents that changed.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | This value cannot be `null`. <br /> |

### getSchemaName

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Also in [T Extensions 3](https://developer.android.com/sdkExtensions)

```
public String getSchemaName ()
```

Returns the name of the schema type that contains the changed documents.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | This value cannot be `null`. <br /> |

### hashCode

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public int hashCode ()
```

Returns a hash code value for the object. This method is
supported for the benefit of hash tables such as those provided by
`https://developer.android.com/reference/java/util/HashMap`.


The general contract of `hashCode` is:

- Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
- If two objects are equal according to the `https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)` method, then calling the `hashCode` method on each of the two objects must produce the same integer result.
- It is *not* required that if two objects are unequal according to the `https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

<br />

<br />

| Returns ||
|---|---|
| `int` | a hash code value for this object. <br /> |

### toString

Added in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public String toString ()
```

Returns a string representation of the object.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | This value cannot be `null`. <br /> |