ScanRequest (AWS Java SDK :: Services :: Amazon DynamoDB 2.17.153 API)

java.lang.Object
- software.amazon.awssdk.core.SdkRequest
- - software.amazon.awssdk.awscore.AwsRequest
  - - software.amazon.awssdk.services.dynamodb.model.DynamoDbRequest
    - - software.amazon.awssdk.services.dynamodb.model.ScanRequest

All Implemented Interfaces:: SdkPojo, ToCopyableBuilder<ScanRequest.Builder,ScanRequest>

@Generated(value="software.amazon.awssdk:codegen")
public final class ScanRequest
extends DynamoDbRequest
implements ToCopyableBuilder<ScanRequest.Builder,ScanRequest>

Represents the input of a Scan operation.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static interface ScanRequest.Builder

Nested Classes
Modifier and Type	Class and Description
`static interface`	`ScanRequest.Builder`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`List<String>`	`attributesToGet()` This is a legacy parameter.
`static ScanRequest.Builder`	`builder()`
`ConditionalOperator`	`conditionalOperator()` This is a legacy parameter.
`String`	`conditionalOperatorAsString()` This is a legacy parameter.
`Boolean`	`consistentRead()` A Boolean value that determines the read consistency model during the scan:
`boolean`	`equals(Object obj)`
`boolean`	`equalsBySdkFields(Object obj)`
`Map<String,AttributeValue>`	`exclusiveStartKey()` The primary key of the first item that this operation will evaluate.
`Map<String,String>`	`expressionAttributeNames()` One or more substitution tokens for attribute names in an expression.
`Map<String,AttributeValue>`	`expressionAttributeValues()` One or more values that can be substituted in an expression.
`String`	`filterExpression()` A string that contains conditions that DynamoDB applies after the `Scan` operation, but before the data is returned to you.
`<T> Optional<T>`	`getValueForField(String fieldName, Class<T> clazz)`
`boolean`	`hasAttributesToGet()` For responses, this returns true if the service returned a value for the AttributesToGet property.
`boolean`	`hasExclusiveStartKey()` For responses, this returns true if the service returned a value for the ExclusiveStartKey property.
`boolean`	`hasExpressionAttributeNames()` For responses, this returns true if the service returned a value for the ExpressionAttributeNames property.
`boolean`	`hasExpressionAttributeValues()` For responses, this returns true if the service returned a value for the ExpressionAttributeValues property.
`int`	`hashCode()`
`boolean`	`hasScanFilter()` For responses, this returns true if the service returned a value for the ScanFilter property.
`String`	`indexName()` The name of a secondary index to scan.
`Integer`	`limit()` The maximum number of items to evaluate (not necessarily the number of matching items).
`String`	`projectionExpression()` A string that identifies one or more attributes to retrieve from the specified table or index.
`ReturnConsumedCapacity`	`returnConsumedCapacity()` Returns the value of the ReturnConsumedCapacity property for this object.
`String`	`returnConsumedCapacityAsString()` Returns the value of the ReturnConsumedCapacity property for this object.
`Map<String,Condition>`	`scanFilter()` This is a legacy parameter.
`List<SdkField<?>>`	`sdkFields()`
`Integer`	`segment()` For a parallel `Scan` request, `Segment` identifies an individual segment to be scanned by an application worker.
`Select`	`select()` The attributes to be returned in the result.
`String`	`selectAsString()` The attributes to be returned in the result.
`static Class<? extends ScanRequest.Builder>`	`serializableBuilderClass()`
`String`	`tableName()` The name of the table containing the requested items; or, if you provide `IndexName`, the name of the table to which that index belongs.
`ScanRequest.Builder`	`toBuilder()`
`String`	`toString()` Returns a string representation of this object.
`Integer`	`totalSegments()` For a parallel `Scan` request, `TotalSegments` represents the total number of segments into which the `Scan` operation will be divided.

Methods inherited from class software.amazon.awssdk.awscore.AwsRequest
overrideConfiguration

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

Methods inherited from interface software.amazon.awssdk.utils.builder.ToCopyableBuilder
copy

- Method Detail
  - tableName
```
public final String tableName()
```
    The name of the table containing the requested items; or, if you provide IndexName, the name of the table to which that index belongs.
    
    Returns:
    
    The name of the table containing the requested items; or, if you provide IndexName, the name of the table to which that index belongs.
  - indexName
```
public final String indexName()
```
    The name of a secondary index to scan. This index can be any local secondary index or global secondary index. Note that if you use the IndexName parameter, you must also provide TableName.
    
    Returns:
    
    The name of a secondary index to scan. This index can be any local secondary index or global secondary index. Note that if you use the IndexName parameter, you must also provide TableName.
  - hasAttributesToGet
```
public final boolean hasAttributesToGet()
```
    For responses, this returns true if the service returned a value for the AttributesToGet property. This DOES NOT check that the value is non-empty (for which, you should check the isEmpty() method on the property). This is useful because the SDK will never return a null collection or map, but you may need to differentiate between the service returning nothing (or null) and the service returning an empty collection or map. For requests, this returns true if a value for the property was specified in the request builder, and false if a value was not specified.
  - attributesToGet
```
public final List<String> attributesToGet()
```
    This is a legacy parameter. Use ProjectionExpression instead. For more information, see AttributesToGet in the Amazon DynamoDB Developer Guide.
    
    Attempts to modify the collection returned by this method will result in an UnsupportedOperationException.
    
    This method will never return null. If you would like to know whether the service returned this field (so that you can differentiate between null and empty), you can use the hasAttributesToGet() method.
    
    Returns:
    
    This is a legacy parameter. Use ProjectionExpression instead. For more information, see AttributesToGet in the Amazon DynamoDB Developer Guide.
  - limit
```
public final Integer limit()
```
    The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed dataset size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey to apply in a subsequent operation to continue the operation. For more information, see Working with Queries in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed dataset size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey to apply in a subsequent operation to continue the operation. For more information, see Working with Queries in the Amazon DynamoDB Developer Guide.
  - select
```
public final Select select()
```
    The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
    - ALL_ATTRIBUTES - Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index, DynamoDB fetches the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required.
    - ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifying ALL_ATTRIBUTES.
    - COUNT - Returns the number of matching items, rather than the matching items themselves.
    - SPECIFIC_ATTRIBUTES - Returns only the attributes listed in AttributesToGet. This return value is equivalent to specifying AttributesToGet without specifying any value for Select.
      
      If you query or scan a local secondary index and request only attributes that are projected into that index, the operation reads only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB fetches each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
      
      If you query or scan a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
    If neither Select nor AttributesToGet are specified, DynamoDB defaults to ALL_ATTRIBUTES when accessing a table, and ALL_PROJECTED_ATTRIBUTES when accessing an index. You cannot use both Select and AttributesToGet together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES. (This usage is equivalent to specifying AttributesToGet without any value for Select.)
    
    If you use the ProjectionExpression parameter, then the value for Select can only be SPECIFIC_ATTRIBUTES. Any other value for Select will return an error.
    
    If the service returns an enum value that is not available in the current SDK version, select will return Select.UNKNOWN_TO_SDK_VERSION. The raw value returned by the service is available from selectAsString().
    Returns:
    The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
    
    ALL_ATTRIBUTES - Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index, DynamoDB fetches the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required.
    
    ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifying ALL_ATTRIBUTES.
    
    COUNT - Returns the number of matching items, rather than the matching items themselves.
    
    SPECIFIC_ATTRIBUTES - Returns only the attributes listed in AttributesToGet. This return value is equivalent to specifying AttributesToGet without specifying any value for Select.
    
    If you query or scan a local secondary index and request only attributes that are projected into that index, the operation reads only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB fetches each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
    
    If you query or scan a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
    
    If neither Select nor AttributesToGet are specified, DynamoDB defaults to ALL_ATTRIBUTES when accessing a table, and ALL_PROJECTED_ATTRIBUTES when accessing an index. You cannot use both Select and AttributesToGet together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES. (This usage is equivalent to specifying AttributesToGet without any value for Select .)
    
    If you use the ProjectionExpression parameter, then the value for Select can only be SPECIFIC_ATTRIBUTES. Any other value for Select will return an error.
    See Also:
    
    Select
  - selectAsString
```
public final String selectAsString()
```
    The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
    - ALL_ATTRIBUTES - Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index, DynamoDB fetches the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required.
    - ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifying ALL_ATTRIBUTES.
    - COUNT - Returns the number of matching items, rather than the matching items themselves.
    - SPECIFIC_ATTRIBUTES - Returns only the attributes listed in AttributesToGet. This return value is equivalent to specifying AttributesToGet without specifying any value for Select.
      
      If you query or scan a local secondary index and request only attributes that are projected into that index, the operation reads only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB fetches each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
      
      If you query or scan a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
    If neither Select nor AttributesToGet are specified, DynamoDB defaults to ALL_ATTRIBUTES when accessing a table, and ALL_PROJECTED_ATTRIBUTES when accessing an index. You cannot use both Select and AttributesToGet together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES. (This usage is equivalent to specifying AttributesToGet without any value for Select.)
    
    If you use the ProjectionExpression parameter, then the value for Select can only be SPECIFIC_ATTRIBUTES. Any other value for Select will return an error.
    
    If the service returns an enum value that is not available in the current SDK version, select will return Select.UNKNOWN_TO_SDK_VERSION. The raw value returned by the service is available from selectAsString().
    Returns:
    The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
    
    ALL_ATTRIBUTES - Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index, DynamoDB fetches the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required.
    
    ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifying ALL_ATTRIBUTES.
    
    COUNT - Returns the number of matching items, rather than the matching items themselves.
    
    SPECIFIC_ATTRIBUTES - Returns only the attributes listed in AttributesToGet. This return value is equivalent to specifying AttributesToGet without specifying any value for Select.
    
    If you query or scan a local secondary index and request only attributes that are projected into that index, the operation reads only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB fetches each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
    
    If you query or scan a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
    
    If neither Select nor AttributesToGet are specified, DynamoDB defaults to ALL_ATTRIBUTES when accessing a table, and ALL_PROJECTED_ATTRIBUTES when accessing an index. You cannot use both Select and AttributesToGet together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES. (This usage is equivalent to specifying AttributesToGet without any value for Select .)
    
    If you use the ProjectionExpression parameter, then the value for Select can only be SPECIFIC_ATTRIBUTES. Any other value for Select will return an error.
    See Also:
    
    Select
  - hasScanFilter
```
public final boolean hasScanFilter()
```
    For responses, this returns true if the service returned a value for the ScanFilter property. This DOES NOT check that the value is non-empty (for which, you should check the isEmpty() method on the property). This is useful because the SDK will never return a null collection or map, but you may need to differentiate between the service returning nothing (or null) and the service returning an empty collection or map. For requests, this returns true if a value for the property was specified in the request builder, and false if a value was not specified.
  - scanFilter
```
public final Map<String,Condition> scanFilter()
```
    This is a legacy parameter. Use FilterExpression instead. For more information, see ScanFilter in the Amazon DynamoDB Developer Guide.
    
    Attempts to modify the collection returned by this method will result in an UnsupportedOperationException.
    
    This method will never return null. If you would like to know whether the service returned this field (so that you can differentiate between null and empty), you can use the hasScanFilter() method.
    
    Returns:
    
    This is a legacy parameter. Use FilterExpression instead. For more information, see ScanFilter in the Amazon DynamoDB Developer Guide.
  - conditionalOperator
```
public final ConditionalOperator conditionalOperator()
```
    This is a legacy parameter. Use FilterExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    If the service returns an enum value that is not available in the current SDK version, conditionalOperator will return ConditionalOperator.UNKNOWN_TO_SDK_VERSION. The raw value returned by the service is available from conditionalOperatorAsString().
    
    Returns:
    
    This is a legacy parameter. Use FilterExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    See Also:
    
    ConditionalOperator
  - conditionalOperatorAsString
```
public final String conditionalOperatorAsString()
```
    This is a legacy parameter. Use FilterExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    If the service returns an enum value that is not available in the current SDK version, conditionalOperator will return ConditionalOperator.UNKNOWN_TO_SDK_VERSION. The raw value returned by the service is available from conditionalOperatorAsString().
    
    Returns:
    
    This is a legacy parameter. Use FilterExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    See Also:
    
    ConditionalOperator
  - hasExclusiveStartKey
```
public final boolean hasExclusiveStartKey()
```
    For responses, this returns true if the service returned a value for the ExclusiveStartKey property. This DOES NOT check that the value is non-empty (for which, you should check the isEmpty() method on the property). This is useful because the SDK will never return a null collection or map, but you may need to differentiate between the service returning nothing (or null) and the service returning an empty collection or map. For requests, this returns true if a value for the property was specified in the request builder, and false if a value was not specified.
  - exclusiveStartKey
```
public final Map<String,AttributeValue> exclusiveStartKey()
```
    The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the previous operation.
    
    The data type for ExclusiveStartKey must be String, Number or Binary. No set data types are allowed.
    
    In a parallel scan, a Scan request that includes ExclusiveStartKey must specify the same segment whose previous Scan returned the corresponding value of LastEvaluatedKey.
    
    Attempts to modify the collection returned by this method will result in an UnsupportedOperationException.
    
    This method will never return null. If you would like to know whether the service returned this field (so that you can differentiate between null and empty), you can use the hasExclusiveStartKey() method.
    
    Returns:
    
    The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the previous operation.
    
    The data type for ExclusiveStartKey must be String, Number or Binary. No set data types are allowed.
    
    In a parallel scan, a Scan request that includes ExclusiveStartKey must specify the same segment whose previous Scan returned the corresponding value of LastEvaluatedKey.
  - returnConsumedCapacity
```
public final ReturnConsumedCapacity returnConsumedCapacity()
```
    Returns the value of the ReturnConsumedCapacity property for this object.
    If the service returns an enum value that is not available in the current SDK version, returnConsumedCapacity will return ReturnConsumedCapacity.UNKNOWN_TO_SDK_VERSION. The raw value returned by the service is available from returnConsumedCapacityAsString().
    
    Returns:
    
    The value of the ReturnConsumedCapacity property for this object.
    
    See Also:
    
    ReturnConsumedCapacity
  - returnConsumedCapacityAsString
```
public final String returnConsumedCapacityAsString()
```
    Returns the value of the ReturnConsumedCapacity property for this object.
    If the service returns an enum value that is not available in the current SDK version, returnConsumedCapacity will return ReturnConsumedCapacity.UNKNOWN_TO_SDK_VERSION. The raw value returned by the service is available from returnConsumedCapacityAsString().
    
    Returns:
    
    The value of the ReturnConsumedCapacity property for this object.
    
    See Also:
    
    ReturnConsumedCapacity
  - totalSegments
```
public final Integer totalSegments()
```
    For a parallel Scan request, TotalSegments represents the total number of segments into which the Scan operation will be divided. The value of TotalSegments corresponds to the number of application workers that will perform the parallel scan. For example, if you want to use four application threads to scan a table or an index, specify a TotalSegments value of 4.
    
    The value for TotalSegments must be greater than or equal to 1, and less than or equal to 1000000. If you specify a TotalSegments value of 1, the Scan operation will be sequential rather than parallel.
    
    If you specify TotalSegments, you must also specify Segment.
    
    Returns:
    
    For a parallel Scan request, TotalSegments represents the total number of segments into which the Scan operation will be divided. The value of TotalSegments corresponds to the number of application workers that will perform the parallel scan. For example, if you want to use four application threads to scan a table or an index, specify a TotalSegments value of 4.
    
    The value for TotalSegments must be greater than or equal to 1, and less than or equal to 1000000. If you specify a TotalSegments value of 1, the Scan operation will be sequential rather than parallel.
    
    If you specify TotalSegments, you must also specify Segment.
  - segment
```
public final Integer segment()
```
    For a parallel Scan request, Segment identifies an individual segment to be scanned by an application worker.
    
    Segment IDs are zero-based, so the first segment is always 0. For example, if you want to use four application threads to scan a table or an index, then the first thread specifies a Segment value of 0, the second thread specifies 1, and so on.
    
    The value of LastEvaluatedKey returned from a parallel Scan request must be used as ExclusiveStartKey with the same segment ID in a subsequent Scan operation.
    
    The value for Segment must be greater than or equal to 0, and less than the value provided for TotalSegments.
    
    If you provide Segment, you must also provide TotalSegments.
    
    Returns:
    
    For a parallel Scan request, Segment identifies an individual segment to be scanned by an application worker.
    
    Segment IDs are zero-based, so the first segment is always 0. For example, if you want to use four application threads to scan a table or an index, then the first thread specifies a Segment value of 0, the second thread specifies 1, and so on.
    
    The value of LastEvaluatedKey returned from a parallel Scan request must be used as ExclusiveStartKey with the same segment ID in a subsequent Scan operation.
    
    The value for Segment must be greater than or equal to 0, and less than the value provided for TotalSegments.
    
    If you provide Segment, you must also provide TotalSegments.
  - projectionExpression
```
public final String projectionExpression()
```
    A string that identifies one or more attributes to retrieve from the specified table or index. 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.
    
    For more information, see Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    A string that identifies one or more attributes to retrieve from the specified table or index. 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.
    
    For more information, see Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
  - filterExpression
```
public final String filterExpression()
```
    A string that contains conditions that DynamoDB applies after the Scan operation, but before the data is returned to you. Items that do not satisfy the FilterExpression criteria are not returned.
    
    A FilterExpression is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
    
    For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    A string that contains conditions that DynamoDB applies after the Scan operation, but before the data is returned to you. Items that do not satisfy the FilterExpression criteria are not returned.
    
    A FilterExpression is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
    
    For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide.
  - hasExpressionAttributeNames
```
public final boolean hasExpressionAttributeNames()
```
    For responses, this returns true if the service returned a value for the ExpressionAttributeNames property. This DOES NOT check that the value is non-empty (for which, you should check the isEmpty() method on the property). This is useful because the SDK will never return a null collection or map, but you may need to differentiate between the service returning nothing (or null) and the service returning an empty collection or map. For requests, this returns true if a value for the property was specified in the request builder, and false if a value was not specified.
  - expressionAttributeNames
```
public final Map<String,String> expressionAttributeNames()
```
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    - To access an attribute whose name conflicts with a DynamoDB reserved word.
    - 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 attribute name:
    - Percentile
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    - {"#P":"Percentile"}
    You could then use this substitution in an expression, as in this example:
    - #P = :val
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
    
    Attempts to modify the collection returned by this method will result in an UnsupportedOperationException.
    
    This method will never return null. If you would like to know whether the service returned this field (so that you can differentiate between null and empty), you can use the hasExpressionAttributeNames() method.
    Returns:
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    
    To access an attribute whose name conflicts with a DynamoDB reserved word.
    
    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 attribute name:
    
    Percentile
    
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    
    {"#P":"Percentile"}
    
    You could then use this substitution in an expression, as in this example:
    
    #P = :val
    
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Specifying Item Attributes in the Amazon DynamoDB Developer Guide.
  - hasExpressionAttributeValues
```
public final boolean hasExpressionAttributeValues()
```
    For responses, this returns true if the service returned a value for the ExpressionAttributeValues property. This DOES NOT check that the value is non-empty (for which, you should check the isEmpty() method on the property). This is useful because the SDK will never return a null collection or map, but you may need to differentiate between the service returning nothing (or null) and the service returning an empty collection or map. For requests, this returns true if a value for the property was specified in the request builder, and false if a value was not specified.
  - expressionAttributeValues
```
public final Map<String,AttributeValue> expressionAttributeValues()
```
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Condition Expressions in the Amazon DynamoDB Developer Guide.
    
    Attempts to modify the collection returned by this method will result in an UnsupportedOperationException.
    
    This method will never return null. If you would like to know whether the service returned this field (so that you can differentiate between null and empty), you can use the hasExpressionAttributeValues() method.
    
    Returns:
    
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Condition Expressions in the Amazon DynamoDB Developer Guide.
  - consistentRead
```
public final Boolean consistentRead()
```
    A Boolean value that determines the read consistency model during the scan:
    - If ConsistentRead is false, then the data returned from Scan might not contain the results from other recently completed write operations (PutItem, UpdateItem , or DeleteItem).
    - If ConsistentRead is true, then all of the write operations that completed before the Scan began are guaranteed to be contained in the Scan response.
    The default setting for ConsistentRead is false.
    
    The ConsistentRead parameter is not supported on global secondary indexes. If you scan a global secondary index with ConsistentRead set to true, you will receive a ValidationException .
    Returns:
    A Boolean value that determines the read consistency model during the scan:
    
    If ConsistentRead is false, then the data returned from Scan might not contain the results from other recently completed write operations (PutItem, UpdateItem, or DeleteItem).
    
    If ConsistentRead is true, then all of the write operations that completed before the Scan began are guaranteed to be contained in the Scan response.
    
    The default setting for ConsistentRead is false.
    
    The ConsistentRead parameter is not supported on global secondary indexes. If you scan a global secondary index with ConsistentRead set to true, you will receive a ValidationException.
  - toBuilder
```
public ScanRequest.Builder toBuilder()
```
    Specified by:
    
    toBuilder in interface ToCopyableBuilder<ScanRequest.Builder,ScanRequest>
    
    Specified by:
    
    toBuilder in class DynamoDbRequest
  - builder
```
public static ScanRequest.Builder builder()
```
  - serializableBuilderClass
```
public static Class<? extends ScanRequest.Builder> serializableBuilderClass()
```
  - hashCode
```
public final int hashCode()
```
    Overrides:
    
    hashCode in class AwsRequest
  - equals
```
public final boolean equals(Object obj)
```
    Overrides:
    
    equals in class AwsRequest
  - equalsBySdkFields
```
public final boolean equalsBySdkFields(Object obj)
```
    Specified by:
    
    equalsBySdkFields in interface SdkPojo
  - toString
```
public final String toString()
```
    Returns a string representation of this object. This is useful for testing and debugging. Sensitive data will be redacted from this string using a placeholder value.
    
    Overrides:
    
    toString in class Object
  - getValueForField
```
public final <T> Optional<T> getValueForField(String fieldName,
                                              Class<T> clazz)
```
    Overrides:
    
    getValueForField in class SdkRequest
  - sdkFields
```
public final List<SdkField<?>> sdkFields()
```
    Specified by:
    
    sdkFields in interface SdkPojo

Class ScanRequest

Nested Class Summary

Method Summary

Methods inherited from class software.amazon.awssdk.awscore.AwsRequest

Methods inherited from class java.lang.Object

Methods inherited from interface software.amazon.awssdk.utils.builder.ToCopyableBuilder

Method Detail

tableName

indexName

hasAttributesToGet

attributesToGet

limit

select

selectAsString

hasScanFilter

scanFilter

conditionalOperator

conditionalOperatorAsString

hasExclusiveStartKey

exclusiveStartKey

returnConsumedCapacity

returnConsumedCapacityAsString

totalSegments

segment

projectionExpression

filterExpression

hasExpressionAttributeNames

expressionAttributeNames

hasExpressionAttributeValues

expressionAttributeValues

consistentRead

toBuilder

builder

serializableBuilderClass

hashCode

equals

equalsBySdkFields

toString

getValueForField

sdkFields