GetItemRequest (AWS Java SDK for Amazon DynamoDB 1.9.16 API)

java.lang.Object
- com.amazonaws.AmazonWebServiceRequest
- - com.amazonaws.services.dynamodbv2.model.GetItemRequest

All Implemented Interfaces:

Serializable
```
public class GetItemRequest
extends com.amazonaws.AmazonWebServiceRequest
implements Serializable
```
Container for the parameters to the GetItem operation.
The GetItem operation returns a set of attributes for the item with the given primary key. If there is no matching item, GetItem does not return any data.

GetItem provides an eventually consistent read by default. If your application requires a strongly consistent read, set ConsistentRead to true . Although a strongly consistent read might take more time than an eventually consistent read, it always returns the last updated value.

See Also:
AmazonDynamoDB.getItem(GetItemRequest), Serialized Form

Field Summary
- Fields inherited from class com.amazonaws.AmazonWebServiceRequest
  NOOP

Constructor Summary

Constructors
Constructor and Description
`GetItemRequest()` Default constructor for a new GetItemRequest object.
`GetItemRequest(String tableName, Map<String,AttributeValue> key)` Constructs a new GetItemRequest object.
`GetItemRequest(String tableName, Map<String,AttributeValue> key, Boolean consistentRead)` Constructs a new GetItemRequest object.

Method Summary

Methods
Modifier and Type	Method and Description
`GetItemRequest`	`addExpressionAttributeNamesEntry(String key, String value)` One or more substitution tokens for simplifying complex expressions.
`GetItemRequest`	`addKeyEntry(String key, AttributeValue value)` A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
`GetItemRequest`	`clearExpressionAttributeNamesEntries()` Removes all the entries added into ExpressionAttributeNames.
`GetItemRequest`	`clearKeyEntries()` Removes all the entries added into Key.
`boolean`	`equals(Object obj)`
`List<String>`	`getAttributesToGet()`
`Boolean`	`getConsistentRead()` A value that if set to `true`, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
`Map<String,String>`	`getExpressionAttributeNames()` One or more substitution tokens for simplifying complex expressions.
`Map<String,AttributeValue>`	`getKey()` A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
`String`	`getProjectionExpression()` One or more attributes to retrieve from the table.
`String`	`getReturnConsumedCapacity()` A value that if set to `TOTAL`, the response includes ConsumedCapacity data for tables and indexes.
`String`	`getTableName()` The name of the table containing the requested item.
`int`	`hashCode()`
`Boolean`	`isConsistentRead()` A value that if set to `true`, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
`void`	`setAttributesToGet(Collection<String> attributesToGet)`
`void`	`setConsistentRead(Boolean consistentRead)` A value that if set to `true`, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
`void`	`setExpressionAttributeNames(Map<String,String> expressionAttributeNames)` One or more substitution tokens for simplifying complex expressions.
`void`	`setKey(Map.Entry<String,AttributeValue> hashKey, Map.Entry<String,AttributeValue> rangeKey)` A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
`void`	`setKey(Map<String,AttributeValue> key)` A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
`void`	`setProjectionExpression(String projectionExpression)` One or more attributes to retrieve from the table.
`void`	`setReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)` A value that if set to `TOTAL`, the response includes ConsumedCapacity data for tables and indexes.
`void`	`setReturnConsumedCapacity(String returnConsumedCapacity)` A value that if set to `TOTAL`, the response includes ConsumedCapacity data for tables and indexes.
`void`	`setTableName(String tableName)` The name of the table containing the requested item.
`String`	`toString()` Returns a string representation of this object; useful for testing and debugging.
`GetItemRequest`	`withAttributesToGet(Collection<String> attributesToGet)`
`GetItemRequest`	`withAttributesToGet(String... attributesToGet)`
`GetItemRequest`	`withConsistentRead(Boolean consistentRead)` A value that if set to `true`, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
`GetItemRequest`	`withExpressionAttributeNames(Map<String,String> expressionAttributeNames)` One or more substitution tokens for simplifying complex expressions.
`GetItemRequest`	`withKey(Map.Entry<String,AttributeValue> hashKey, Map.Entry<String,AttributeValue> rangeKey)` A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
`GetItemRequest`	`withKey(Map<String,AttributeValue> key)` A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
`GetItemRequest`	`withProjectionExpression(String projectionExpression)` One or more attributes to retrieve from the table.
`GetItemRequest`	`withReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)` A value that if set to `TOTAL`, the response includes ConsumedCapacity data for tables and indexes.
`GetItemRequest`	`withReturnConsumedCapacity(String returnConsumedCapacity)` A value that if set to `TOTAL`, the response includes ConsumedCapacity data for tables and indexes.
`GetItemRequest`	`withTableName(String tableName)` The name of the table containing the requested item.

Methods inherited from class com.amazonaws.AmazonWebServiceRequest
copyBaseTo, copyPrivateRequestParameters, getCustomRequestHeaders, getGeneralProgressListener, getReadLimit, getRequestClientOptions, getRequestCredentials, getRequestMetricCollector, putCustomRequestHeader, setGeneralProgressListener, setRequestCredentials, setRequestMetricCollector, withGeneralProgressListener, withRequestMetricCollector

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

- Constructor Detail
  - GetItemRequest
```
public GetItemRequest()
```
    Default constructor for a new GetItemRequest object. Callers should use the setter or fluent setter (with...) methods to initialize this object after creating it.
  - GetItemRequest
```
public GetItemRequest(String tableName,
              Map<String,AttributeValue> key)
```
    Constructs a new GetItemRequest object. Callers should use the setter or fluent setter (with...) methods to initialize any additional object members.
    
    Parameters:
    tableName - The name of the table containing the requested item.
    key - A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
  - GetItemRequest
```
public GetItemRequest(String tableName,
              Map<String,AttributeValue> key,
              Boolean consistentRead)
```
    Constructs a new GetItemRequest object. Callers should use the setter or fluent setter (with...) methods to initialize any additional object members.
    
    Parameters:
    tableName - The name of the table containing the requested item.
    key - A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    consistentRead - A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
- Method Detail
  - getTableName
```
public String getTableName()
```
    The name of the table containing the requested item.
    Constraints:
    Length: 3 - 255
    Pattern: [a-zA-Z0-9_.-]+
    
    Returns:
    The name of the table containing the requested item.
  - setTableName
```
public void setTableName(String tableName)
```
    The name of the table containing the requested item.
    Constraints:
    Length: 3 - 255
    Pattern: [a-zA-Z0-9_.-]+
    
    Parameters:
    tableName - The name of the table containing the requested item.
  - withTableName
```
public GetItemRequest withTableName(String tableName)
```
    The name of the table containing the requested item.
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Length: 3 - 255
    Pattern: [a-zA-Z0-9_.-]+
    
    Parameters:
    tableName - The name of the table containing the requested item.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
  - getKey
```
public Map<String,AttributeValue> getKey()
```
    A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    
    Returns:
    A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
  - setKey
```
public void setKey(Map<String,AttributeValue> key)
```
    A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    
    Parameters:
    key - A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
  - withKey
```
public GetItemRequest withKey(Map<String,AttributeValue> key)
```
    A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    key - A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
  - setKey
```
public void setKey(Map.Entry<String,AttributeValue> hashKey,
          Map.Entry<String,AttributeValue> rangeKey)
            throws IllegalArgumentException
```
    A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    This method accepts the hashKey, rangeKey of Key as java.util.Map.Entry objects.
    
    Parameters:
    hashKey - Primary hash key.
    rangeKey - Primary range key. (null if it a hash-only table)
    
    Throws:
    
    IllegalArgumentException
  - withKey
```
public GetItemRequest withKey(Map.Entry<String,AttributeValue> hashKey,
                     Map.Entry<String,AttributeValue> rangeKey)
                       throws IllegalArgumentException
```
    A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    This method accepts the hashKey, rangeKey of Key as java.util.Map.Entry objects.
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    hashKey - Primary hash key.
    rangeKey - Primary range key. (null if it a hash-only table)
    
    Throws:
    
    IllegalArgumentException
  - addKeyEntry
```
public GetItemRequest addKeyEntry(String key,
                         AttributeValue value)
```
    A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
    For the primary key, you must provide all of the attributes. For example, with a hash type primary key, you only need to specify the hash attribute. For a hash-and-range type primary key, you must specify both the hash attribute and the range attribute.
    The method adds a new key-value pair into Key parameter, and returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    key - The key of the entry to be added into Key.
    value - The corresponding value of the entry to be added into Key.
  - clearKeyEntries
```
public GetItemRequest clearKeyEntries()
```
    Removes all the entries added into Key.
    Returns a reference to this object so that method calls can be chained together.
  - getAttributesToGet
```
public List<String> getAttributesToGet()
```
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
    Constraints:
    Length: 1 -
    
    Returns:
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
  - setAttributesToGet
```
public void setAttributesToGet(Collection<String> attributesToGet)
```
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
    Constraints:
    Length: 1 -
    
    Parameters:
    attributesToGet -
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
  - withAttributesToGet
```
public GetItemRequest withAttributesToGet(String... attributesToGet)
```
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Length: 1 -
    
    Parameters:
    attributesToGet -
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
  - withAttributesToGet
```
public GetItemRequest withAttributesToGet(Collection<String> attributesToGet)
```
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Length: 1 -
    
    Parameters:
    attributesToGet -
    There is a newer parameter available. Use ProjectionExpression instead. Note that if you use AttributesToGet and ProjectionExpression at the same time, DynamoDB will return a ValidationException exception.
    This parameter allows you to retrieve lists or maps; however, it cannot retrieve individual list or map elements.
    The names of one or more attributes to retrieve. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
  - isConsistentRead
```
public Boolean isConsistentRead()
```
    A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
    
    Returns:
    A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
  - setConsistentRead
```
public void setConsistentRead(Boolean consistentRead)
```
    A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
    
    Parameters:
    consistentRead - A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
  - withConsistentRead
```
public GetItemRequest withConsistentRead(Boolean consistentRead)
```
    A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    consistentRead - A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
  - getConsistentRead
```
public Boolean getConsistentRead()
```
    A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
    
    Returns:
    A value that if set to true, then the operation uses strongly consistent reads; otherwise, eventually consistent reads are used.
  - getReturnConsumedCapacity
```
public String getReturnConsumedCapacity()
```
    A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    
    Returns:
    A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    See Also:
    ReturnConsumedCapacity
  - setReturnConsumedCapacity
```
public void setReturnConsumedCapacity(String returnConsumedCapacity)
```
    A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    
    Parameters:
    returnConsumedCapacity - A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    See Also:
    ReturnConsumedCapacity
  - withReturnConsumedCapacity
```
public GetItemRequest withReturnConsumedCapacity(String returnConsumedCapacity)
```
    A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    
    Parameters:
    returnConsumedCapacity - A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
    See Also:
    ReturnConsumedCapacity
  - setReturnConsumedCapacity
```
public void setReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
```
    A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    
    Parameters:
    returnConsumedCapacity - A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    See Also:
    ReturnConsumedCapacity
  - withReturnConsumedCapacity
```
public GetItemRequest withReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
```
    A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    
    Parameters:
    returnConsumedCapacity - A value that if set to TOTAL, the response includes ConsumedCapacity data for tables and indexes. If set to INDEXES, the response includes ConsumedCapacity for indexes. If set to NONE (the default), ConsumedCapacity is not included in the response.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
    See Also:
    ReturnConsumedCapacity
  - getProjectionExpression
```
public String getProjectionExpression()
```
    One or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
    If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    
    Returns:
    One or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
    If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
  - setProjectionExpression
```
public void setProjectionExpression(String projectionExpression)
```
    One or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
    If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    
    Parameters:
    projectionExpression - One or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
    If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
  - withProjectionExpression
```
public GetItemRequest withProjectionExpression(String projectionExpression)
```
    One or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
    If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    projectionExpression - One or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
    If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
    
    Returns:
    A reference to this updated object so that method calls can be chained together.
  - getExpressionAttributeNames
```
public Map<String,String> getExpressionAttributeNames()
```
    One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:
    - To shorten an attribute name that is very long or unwieldy in an expression.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following expression:
    - order.customerInfo.LastName = "Smith" OR order.customerInfo.LastName = "Jones"
    Now suppose that you specified the following for ExpressionAttributeNames:
    - {"n":"order.customerInfo.LastName"}
    The expression can now be simplified as follows:
    - #n = "Smith" OR #n = "Jones"
    Returns:
    One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:
    
    To shorten an attribute name that is very long or unwieldy in an expression.
    
    To create a placeholder for repeating occurrences of an attribute name in an expression.
    
    To prevent special characters in an attribute name from being misinterpreted in an expression.
    
    Use the # character in an expression to dereference an attribute name. For example, consider the following expression:
    order.customerInfo.LastName = "Smith" OR order.customerInfo.LastName = "Jones"
    
    Now suppose that you specified the following for ExpressionAttributeNames:
    {"n":"order.customerInfo.LastName"}
    
    The expression can now be simplified as follows:
    #n = "Smith" OR #n = "Jones"
  - setExpressionAttributeNames
```
public void setExpressionAttributeNames(Map<String,String> expressionAttributeNames)
```
    One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:
    - To shorten an attribute name that is very long or unwieldy in an expression.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following expression:
    - order.customerInfo.LastName = "Smith" OR order.customerInfo.LastName = "Jones"
    Now suppose that you specified the following for ExpressionAttributeNames:
    - {"n":"order.customerInfo.LastName"}
    The expression can now be simplified as follows:
    - #n = "Smith" OR #n = "Jones"
    Parameters:
    expressionAttributeNames - One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:
    
    To shorten an attribute name that is very long or unwieldy in an expression.
    
    To create a placeholder for repeating occurrences of an attribute name in an expression.
    
    To prevent special characters in an attribute name from being misinterpreted in an expression.
    
    Use the # character in an expression to dereference an attribute name. For example, consider the following expression:
    order.customerInfo.LastName = "Smith" OR order.customerInfo.LastName = "Jones"
    
    Now suppose that you specified the following for ExpressionAttributeNames:
    {"n":"order.customerInfo.LastName"}
    
    The expression can now be simplified as follows:
    #n = "Smith" OR #n = "Jones"
  - withExpressionAttributeNames
```
public GetItemRequest withExpressionAttributeNames(Map<String,String> expressionAttributeNames)
```
    One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:
    - To shorten an attribute name that is very long or unwieldy in an expression.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following expression:
    - order.customerInfo.LastName = "Smith" OR order.customerInfo.LastName = "Jones"
    Now suppose that you specified the following for ExpressionAttributeNames:
    - {"n":"order.customerInfo.LastName"}
    The expression can now be simplified as follows:
    - #n = "Smith" OR #n = "Jones"
    Returns a reference to this object so that method calls can be chained together.
    Parameters:
    expressionAttributeNames - One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:
    
    To shorten an attribute name that is very long or unwieldy in an expression.
    
    To create a placeholder for repeating occurrences of an attribute name in an expression.
    
    To prevent special characters in an attribute name from being misinterpreted in an expression.
    
    Use the # character in an expression to dereference an attribute name. For example, consider the following expression:
    order.customerInfo.LastName = "Smith" OR order.customerInfo.LastName = "Jones"
    
    Now suppose that you specified the following for ExpressionAttributeNames:
    {"n":"order.customerInfo.LastName"}
    
    The expression can now be simplified as follows:
    #n = "Smith" OR #n = "Jones"
    Returns:
    A reference to this updated object so that method calls can be chained together.
  - addExpressionAttributeNamesEntry
```
public GetItemRequest addExpressionAttributeNamesEntry(String key,
                                              String value)
```
    One or more substitution tokens for simplifying complex expressions. The following are some use cases for an ExpressionAttributeNames value:
    - To shorten an attribute name that is very long or unwieldy in an expression.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following expression:
    - order.customerInfo.LastName = "Smith" OR order.customerInfo.LastName = "Jones"
    Now suppose that you specified the following for ExpressionAttributeNames:
    - {"n":"order.customerInfo.LastName"}
    The expression can now be simplified as follows:
    - #n = "Smith" OR #n = "Jones"
    The method adds a new key-value pair into ExpressionAttributeNames parameter, and returns a reference to this object so that method calls can be chained together.
    Parameters:
    key - The key of the entry to be added into ExpressionAttributeNames.
    value - The corresponding value of the entry to be added into ExpressionAttributeNames.
  - clearExpressionAttributeNamesEntries
```
public GetItemRequest clearExpressionAttributeNamesEntries()
```
    Removes all the entries added into ExpressionAttributeNames.
    Returns a reference to this object so that method calls can be chained together.
  - toString
```
public String toString()
```
    Returns a string representation of this object; useful for testing and debugging.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    A string representation of this object.
    See Also:
    Object.toString()
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object

Class GetItemRequest

Field Summary

Fields inherited from class com.amazonaws.AmazonWebServiceRequest

Constructor Summary

Method Summary

Methods inherited from class com.amazonaws.AmazonWebServiceRequest

Methods inherited from class java.lang.Object

Constructor Detail

GetItemRequest

GetItemRequest

GetItemRequest

Method Detail

getTableName

setTableName

withTableName

getKey

setKey

withKey

setKey

withKey

addKeyEntry

clearKeyEntries

getAttributesToGet

setAttributesToGet

withAttributesToGet

withAttributesToGet

isConsistentRead

setConsistentRead

withConsistentRead

getConsistentRead

getReturnConsumedCapacity

setReturnConsumedCapacity

withReturnConsumedCapacity

setReturnConsumedCapacity

withReturnConsumedCapacity

getProjectionExpression

setProjectionExpression

withProjectionExpression

getExpressionAttributeNames

setExpressionAttributeNames

withExpressionAttributeNames

addExpressionAttributeNamesEntry

clearExpressionAttributeNamesEntries

toString

hashCode

equals