Utils (deep commons 0.2.9 API)

java.lang.Object
- com.stratio.deep.utils.Utils

```
public final class Utils
extends Object
```
Utility class providing useful methods to manipulate the conversion between ByteBuffers maps coming from the underlying Cassandra API to instances of a concrete javabean.

Author:

Luca Rosellini

Method Summary

Methods
Modifier and Type	Method and Description
`static String`	`additionalFilterGenerator(Map<String,Serializable> additionalFilters)` Generates the part of the query where clause that will hit the Cassandra's secondary indexes.
`static String`	`batchQueryGenerator(List<String> statements)` Returns a CQL batch query wrapping the given statements.
`static scala.Tuple2<Cells,Cells>`	`cellList2tuple(Cells cells)` Utility method that converts an IDeepType to tuple of two Cells. The first Cells element contains the list of Cell elements that represent the key (partition + cluster key).
`static String`	`createTableQueryGenerator(Cells keys, Cells values, String outputKeyspace, String outputColumnFamily)` Generates a create table cql statement from the given Cells description.
`static <T extends IDeepType> scala.Tuple2<Cells,Cells>`	`deepType2tuple(T e)` Convers an instance of type to a tuple of ( Map, List ).
`static Method`	`findSetter(String propertyName, Class entityClass, Class valueType)` Resolves the setter name for the property whose name is 'propertyName' whose type is 'valueType' in the entity bean whose class is 'entityClass'.
`static Field[]`	`getAllFields(Class clazz)` Return the set of fields declared at all level of class hierachy
`static InetAddress`	`inetAddressFromLocation(String location)` Returns the inet address for the specified location.
`static <T> org.apache.cassandra.db.marshal.AbstractType<?>`	`marshallerInstance(T obj)` Returns an instance of the Cassandra validator that matches the provided object.
`static <T extends IDeepType> T`	`newTypeInstance(Class<T> clazz)` Creates a new instance of the given class.
`static <T> T`	`newTypeInstance(String className, Class<T> returnClass)` Creates a new instance of the given class name.
`static scala.Tuple2<String[],Object[]>`	`prepareTuple4CqlDriver(scala.Tuple2<Cells,Cells> tuple)` Splits columns names and values as required by Datastax java driver to generate an Insert query.
`static String`	`quote(String identifier)` Quoting for working with uppercase
`static String`	`singleQuote(String identifier)` Quoting for working with uppercase
`static String`	`updateQueryGenerator(Cells keys, Cells values, String outputKeyspace, String outputColumnFamily)` Generates the update query for the provided IDeepType.

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

- Method Detail
  - cellList2tuple
```
public static scala.Tuple2<Cells,Cells> cellList2tuple(Cells cells)
```
    Utility method that converts an IDeepType to tuple of two Cells.
    The first Cells element contains the list of Cell elements that represent the key (partition + cluster key).
    The second Cells element contains all the other columns.
    
    Parameters:
    cells - the Cells object to process.
    
    Returns:
    a pair whose first element is a Cells object containing key Cell(s) and whose second element contains all of the other Cell(s).
  - deepType2tuple
```
public static <T extends IDeepType> scala.Tuple2<Cells,Cells> deepType2tuple(T e)
```
    Convers an instance of type to a tuple of ( Map, List ). The first map contains the key column names and the corresponding values. The ByteBuffer list contains the value of the columns that will be bounded to CQL query parameters.
    
    Type Parameters:
    T - the entity object generic type.
    Parameters:
    e - the entity object to process.
    
    Returns:
    a pair whose first element is a Cells object containing key Cell(s) and whose second element contains all of the other Cell(s).
  - newTypeInstance
```
public static <T extends IDeepType> T newTypeInstance(Class<T> clazz)
```
    Creates a new instance of the given class.
    
    Parameters:
    clazz - the class object for which a new instance should be created.
    
    Returns:
    the new instance of class clazz.
  - newTypeInstance
```
public static <T> T newTypeInstance(String className,
                    Class<T> returnClass)
```
    Creates a new instance of the given class name.
    
    Parameters:
    className - the class object for which a new instance should be created.
    
    Returns:
    the new instance of class clazz.
  - quote
```
public static String quote(String identifier)
```
    Quoting for working with uppercase
  - singleQuote
```
public static String singleQuote(String identifier)
```
    Quoting for working with uppercase
  - additionalFilterGenerator
```
public static String additionalFilterGenerator(Map<String,Serializable> additionalFilters)
```
    Generates the part of the query where clause that will hit the Cassandra's secondary indexes.
    
    Parameters:
    additionalFilters - the map of filters names and values.
    
    Returns:
    the query subpart corresponding to the provided additional filters.
  - createTableQueryGenerator
```
public static String createTableQueryGenerator(Cells keys,
                               Cells values,
                               String outputKeyspace,
                               String outputColumnFamily)
```
    Generates a create table cql statement from the given Cells description.
    
    Parameters:
    keys - the row keys wrapped inside a Cells object.
    values - all the other row columns wrapped inside a Cells object.
    outputKeyspace - the output keyspace.
    outputColumnFamily - the output column family.
    
    Returns:
    the create table statement.
  - updateQueryGenerator
```
public static String updateQueryGenerator(Cells keys,
                          Cells values,
                          String outputKeyspace,
                          String outputColumnFamily)
```
    Generates the update query for the provided IDeepType. The UPDATE query takes into account all the columns of the testentity, even those containing the null value. We do not generate the key part of the update query. The provided query will be concatenated with the key part by CqlRecordWriter.
    
    Parameters:
    keys - the row keys wrapped inside a Cells object.
    values - all the other row columns wrapped inside a Cells object.
    outputKeyspace - the output keyspace.
    outputColumnFamily - the output column family.
    
    Returns:
    the update query statement.
  - batchQueryGenerator
```
public static String batchQueryGenerator(List<String> statements)
```
    Returns a CQL batch query wrapping the given statements.
    
    Parameters:
    statements - the list of statements to use to generate the batch statement.
    
    Returns:
    the batch statement.
  - prepareTuple4CqlDriver
```
public static scala.Tuple2<String[],Object[]> prepareTuple4CqlDriver(scala.Tuple2<Cells,Cells> tuple)
```
    Splits columns names and values as required by Datastax java driver to generate an Insert query.
    
    Parameters:
    tuple - an object containing the key Cell(s) as the first element and all the other columns as the second element.
    
    Returns:
    an object containing an array of column names as the first element and an array of column values as the second element.
  - findSetter
```
public static Method findSetter(String propertyName,
                Class entityClass,
                Class valueType)
```
    Resolves the setter name for the property whose name is 'propertyName' whose type is 'valueType' in the entity bean whose class is 'entityClass'. If we don't find a setter following Java's naming conventions, before throwing an exception we try to resolve the setter following Scala's naming conventions.
    
    Parameters:
    propertyName - the field name of the property whose setter we want to resolve.
    entityClass - the bean class object in which we want to search for the setter.
    valueType - the class type of the object that we want to pass to the setter.
    
    Returns:
    the resolved setter.
  - marshallerInstance
```
public static <T> org.apache.cassandra.db.marshal.AbstractType<?> marshallerInstance(T obj)
```
    Returns an instance of the Cassandra validator that matches the provided object.
    
    Type Parameters:
    T - the generic object type.
    Parameters:
    obj - the object to use to resolve the cassandra marshaller.
    
    Returns:
    an instance of the Cassandra validator that matches the provided object.
    
    Throws:
    
    DeepGenericException - if no validator can be found for the specified object.
  - inetAddressFromLocation
```
public static InetAddress inetAddressFromLocation(String location)
```
    Returns the inet address for the specified location.
    
    Parameters:
    location - the address as String
    
    Returns:
    the InetAddress object associated to the provided address.
  - getAllFields
```
public static Field[] getAllFields(Class clazz)
```
    Return the set of fields declared at all level of class hierachy

Class Utils

Method Summary

Methods inherited from class java.lang.Object

Method Detail

cellList2tuple

deepType2tuple

newTypeInstance

newTypeInstance

quote

singleQuote

additionalFilterGenerator

createTableQueryGenerator

updateQueryGenerator

batchQueryGenerator

prepareTuple4CqlDriver

findSetter

marshallerInstance

inetAddressFromLocation

getAllFields