Package org.apache.cassandra.cql3

Class Lists

java.lang.Object

org.apache.cassandra.cql3.Lists

public abstract class Lists
extends Object

Static helper methods and classes for lists.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Lists.Appender
static class	Lists.DelayedValue	Basically similar to a Value, but with some non-pure function (that need to be evaluated at execution time) in it.
static class	Lists.Discarder
static class	Lists.DiscarderByIndex
static class	Lists.Literal
static class	Lists.Marker	A marker for List values and IN relations
static class	Lists.Prepender
static class	Lists.Setter
static class	Lists.SetterByIndex
static class	Lists.Value

Method Summary

Modifier and Type	Method	Description
static <T> ListType<?>	getExactListTypeIfKnown(List<T> items, Function<T,AbstractType<?>> mapper)	Returns the exact ListType from the items if it can be known.
static <T> ListType<?>	getPreferredCompatibleType(List<T> items, Function<T,AbstractType<?>> mapper)
static ColumnSpecification	indexSpecOf(ColumnSpecification column)
static <T> String	listToString(Iterable<T> items, Function<T,String> mapper)	Create a String representation of the list from the specified items associated to the list elements.
static String	listToString(List<?> elements)	Create a String representation of the list containing the specified elements.
static AssignmentTestable.TestResult	testListAssignment(ColumnSpecification receiver, List<? extends AssignmentTestable> elements)	Tests that the list with the specified elements can be assigned to the specified column.
static ColumnSpecification	valueSpecOf(ColumnSpecification column)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

indexSpecOf

public static ColumnSpecification indexSpecOf(ColumnSpecification column)

valueSpecOf

public static ColumnSpecification valueSpecOf(ColumnSpecification column)

testListAssignment

public static AssignmentTestable.TestResult testListAssignment(ColumnSpecification receiver,
 List<? extends AssignmentTestable> elements)

Tests that the list with the specified elements can be assigned to the specified column.

Parameters:

receiver - the receiving column

elements - the list elements

listToString

public static String listToString(List<?> elements)

Create a String representation of the list containing the specified elements.

Parameters:

elements - the list elements

Returns:

a String representation of the list

listToString

public static <T> String listToString(Iterable<T> items,
 Function<T,String> mapper)

Create a String representation of the list from the specified items associated to the list elements.

Parameters:

items - items associated to the list elements

mapper - the mapper used to map the items to the String representation of the list elements

Returns:

a String representation of the list

getExactListTypeIfKnown

public static <T> ListType<?> getExactListTypeIfKnown(List<T> items,
 Function<T,AbstractType<?>> mapper)

Returns the exact ListType from the items if it can be known.

Parameters:

items - the items mapped to the list elements

mapper - the mapper used to retrieve the element types from the items

Returns:

the exact ListType from the items if it can be known or null

getPreferredCompatibleType

public static <T> ListType<?> getPreferredCompatibleType(List<T> items,
 Function<T,AbstractType<?>> mapper)