Storage (Apache TinkerPop 3.3.1-SNAPSHOT API)

All Known Implementing Classes:

FileSystemStorage, SparkContextStorage
```
public interface Storage
```
Storage is a standard API that providers can implement to allow "file-system"-based access to data sources. The methods provided by Storage are similar in form and behavior to standard Linux operating system commands.

Author:

Marko A. Rodriguez (http://markorodriguez.com)

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`boolean`	`cp(String sourceLocation, String targetLocation)` Recursively copy all the data sources from the source location to the target location.
`boolean`	`exists(String location)` Determine whether the specified location has a data source.
`default Iterator<String>`	`head(String location)` Get a string representation of the specified number of lines at the data source location.
`default Iterator<Vertex>`	`head(String location, Class readerClass)` Get the vertices at the specified graph location.
`Iterator<Vertex>`	`head(String location, Class readerClass, int totalLines)` Get the vertices at the specified graph location.
`Iterator<String>`	`head(String location, int totalLines)` Get a string representation of the specified number of lines at the data source location.
`default <K,V> Iterator<KeyValue<K,V>>`	`head(String location, String memoryKey, Class readerClass)` Get the `KeyValue` data at the specified memory location.
`<K,V> Iterator<KeyValue<K,V>>`	`head(String location, String memoryKey, Class readerClass, int totalLines)` Get the `KeyValue` data at the specified memory location.
`List<String>`	`ls()` List all the data sources in the root directory.
`List<String>`	`ls(String location)` List all the data sources at the specified location.
`boolean`	`rm(String location)` Recursively remove the data source at the specified location.

- Method Detail
  - ls
```
List<String> ls()
```
    List all the data sources in the root directory.
    
    Returns:
    
    the data sources in the root directory
  - ls
```
List<String> ls(String location)
```
    List all the data sources at the specified location.
    
    Parameters:
    
    location - a location
    
    Returns:
    
    the data sources at the specified location
  - cp
```
boolean cp(String sourceLocation,
           String targetLocation)
```
    Recursively copy all the data sources from the source location to the target location.
    
    Parameters:
    
    sourceLocation - the source location
    
    targetLocation - the target location
    
    Returns:
    
    whether data sources were copied
  - exists
```
boolean exists(String location)
```
    Determine whether the specified location has a data source.
    
    Parameters:
    
    location - a location to check
    
    Returns:
    
    whether that location has a data source.
  - rm
```
boolean rm(String location)
```
    Recursively remove the data source at the specified location.
    
    Parameters:
    
    location - the location of the data source
    
    Returns:
    
    whether a data source was removed.
  - head
```
default Iterator<String> head(String location)
```
    Get a string representation of the specified number of lines at the data source location.
    
    Parameters:
    
    location - the data source location
    
    Returns:
    
    an iterator of lines
  - head
```
Iterator<String> head(String location,
                      int totalLines)
```
    Get a string representation of the specified number of lines at the data source location.
    
    Parameters:
    
    location - the data source location
    
    totalLines - the total number of lines to retrieve
    
    Returns:
    
    an iterator of lines.
  - head
```
Iterator<Vertex> head(String location,
                      Class readerClass,
                      int totalLines)
```
    Get the vertices at the specified graph location.
    
    Parameters:
    
    location - the location of the graph (or the root location and search will be made)
    
    readerClass - the class of the parser that understands the graph format
    
    totalLines - the total number of lines of the graph to return
    
    Returns:
    
    an iterator of vertices.
  - head
```
default Iterator<Vertex> head(String location,
                              Class readerClass)
```
    Get the vertices at the specified graph location.
    
    Parameters:
    
    location - the location of the graph (or the root location and search will be made)
    
    readerClass - the class of the parser that understands the graph format
    
    Returns:
    
    an iterator of vertices.
  - head
```
<K,V> Iterator<KeyValue<K,V>> head(String location,
                                   String memoryKey,
                                   Class readerClass,
                                   int totalLines)
```
    Get the KeyValue data at the specified memory location.
    
    Parameters:
    
    location - the root location of the data
    
    memoryKey - the memory key
    
    readerClass - the class of the parser that understands the memory format
    
    totalLines - the total number of key-values to return
    
    Returns:
    
    an iterator of key-values.
  - head
```
default <K,V> Iterator<KeyValue<K,V>> head(String location,
                                           String memoryKey,
                                           Class readerClass)
```
    Get the KeyValue data at the specified memory location.
    
    Parameters:
    
    location - the root location of the data
    
    memoryKey - the memory key
    
    readerClass - the class of the parser that understands the memory format
    
    Returns:
    
    an iterator of key-values.

Interface Storage

Method Summary

Method Detail

ls

ls

cp

exists

rm

head

head

head

head

head

head