com.linkedin.data

Class DataList

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

com.linkedin.data.collections.CheckedList<java.lang.Object>

com.linkedin.data.DataList

All Implemented Interfaces:

Common, CommonList<java.lang.Object>, DataComplex, Instrumentable, java.lang.Cloneable, java.lang.Iterable<java.lang.Object>, java.util.Collection<java.lang.Object>, java.util.List<java.lang.Object>

public final class DataList
extends CheckedList<java.lang.Object>
implements DataComplex

A DataList is ordered list of Data objects.

When an value is being added or replaced on the list, the list will verify that the value is a Data object. If the value is not a Data object, then the list will throw an IllegalArgumentException.

Cloning via the clone() method will shallow copy the DataList and will not deep copy contained complex objects. Copying via the copy() method will deep copy the DataList, which includes deep copying the contained complex objects.

Instrumentation if enabled is only enabled for the DataList and not for the underlying CheckedList. Furthermore, if a DataList is cloned, the clone will not have instrumentation enabled and the clone's instrumented data will be cleared.

Since DataList extends CheckedList, copying of the DataList is lazy and may be delayed until the DataList is about to be modified.

Field Summary

Fields inherited from class java.util.AbstractList

modCount

Fields inherited from interface com.linkedin.data.Instrumentable

TIMES_ACCESSED, VALUE

Constructor Summary

Constructors

Constructor and Description
DataList() Construct an empty DataList.
DataList(int initialCapacity) Construct a DataList with the specified initial capacity.
DataList(java.util.List<? extends java.lang.Object> list) Construct a DataList with Data objects provided by the input list.

Method Summary

Modifier and Type	Method and Description
void	clearInstrumentedData() Clear tracked data.
DataList	clone() Shallow clone.
void	collectInstrumentedData(java.lang.StringBuilder keyPrefix, java.util.Map<java.lang.String,java.util.Map<java.lang.String,java.lang.Object>> instrumentedData, boolean collectAllData) Collect either all the data in this and contained Instrumentable or only the keys or indices that have been marked as accessed depending on the collectAllData flag.
DataList	copy() Deep copy.
void	copyReferencedObjects(com.linkedin.data.DataComplexTable alreadyCopied) Deep copy this object and the complex Data objects referenced by this object.
int	dataComplexHashCode() Returns the data complex hash code of this data complex object.
java.lang.Object	get(int index)
DataList	getDataList(int index) Returns the element at the specified position cast to a DataList.
DataMap	getDataMap(int index) Returns the element at the specified position cast to a DataMap.
boolean	isMadeReadOnly() Whether this object and recursively contained complex objects are read-only.
void	makeReadOnly() Make read-only this object and recursively contained complex objects.
void	startInstrumentingAccess() Sets the state of this Instrumentable to start instrumenting data access.
void	stopInstrumentingAccess() Sets the state of this Instrumentable to stop instrumenting data access.
java.util.Collection<java.lang.Object>	values() Return the collection of values in this complex object.

Methods inherited from class com.linkedin.data.collections.CheckedList

add, add, addAll, addAll, addWithoutChecking, clear, contains, containsAll, equals, getObject, hashCode, indexOf, invalidate, isEmpty, isReadOnly, lastIndexOf, remove, remove, removeAll, removeRange, retainAll, set, setReadOnly, setWithoutChecking, size, toArray, toArray, toString

Methods inherited from class java.util.AbstractList

iterator, listIterator, listIterator, subList

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.linkedin.data.collections.Common

invalidate, isReadOnly, setReadOnly

Methods inherited from interface java.util.List

iterator, listIterator, listIterator, replaceAll, sort, spliterator, subList

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

DataList

public DataList()

Construct an empty DataList.

DataList

public DataList(java.util.List<? extends java.lang.Object> list)

Construct a DataList with Data objects provided by the input list.

Parameters:

list - provides the initial Data objects in the constructed list.

DataList

public DataList(int initialCapacity)

Construct a DataList with the specified initial capacity.

Parameters:

initialCapacity - provides the initial capacity of the DataList.

Method Detail

get

public java.lang.Object get(int index)

Specified by:

get in interface java.util.List<java.lang.Object>

Overrides:

get in class CheckedList<java.lang.Object>

clone

public DataList clone()
               throws java.lang.CloneNotSupportedException

Description copied from interface: Common

Shallow clone. The contained values are not recursively cloned. The clone will be read-write enabled.

Specified by:

clone in interface Common

Specified by:

clone in interface CommonList<java.lang.Object>

Specified by:

clone in interface DataComplex

Overrides:

clone in class CheckedList<java.lang.Object>

Returns:

the clone.

Throws:

java.lang.CloneNotSupportedException - if the object cannot be shallow copied.

copy

public DataList copy()
              throws java.lang.CloneNotSupportedException

Description copied from interface: DataComplex

Deep copy. Clones this object, deep copies complex Data objects referenced by this object, and update internal references to point to the deep copies.

Specified by:

copy in interface DataComplex

Throws:

java.lang.CloneNotSupportedException - if the object cannot be deep copied.

copyReferencedObjects

public void copyReferencedObjects(com.linkedin.data.DataComplexTable alreadyCopied)
                           throws java.lang.CloneNotSupportedException

Deep copy this object and the complex Data objects referenced by this object.

Parameters:

alreadyCopied - provides the objects already copied, and their copies.

Throws:

java.lang.CloneNotSupportedException - if the referenced object cannot be copied.

values

public java.util.Collection<java.lang.Object> values()

Description copied from interface: DataComplex

Return the collection of values in this complex object. This is not recursive. It only returns the values directly contained in this object.

Specified by:

values in interface DataComplex

Returns:

the collection of values in this complex object.

makeReadOnly

public void makeReadOnly()

Description copied from interface: DataComplex

Make read-only this object and recursively contained complex objects. This is irreversible, once a complex object becomes read-only, it cannot be changed back to read-write. Note: Contained primitive types are always immutable.

Specified by:

makeReadOnly in interface DataComplex

isMadeReadOnly

public boolean isMadeReadOnly()

Description copied from interface: DataComplex

Whether this object and recursively contained complex objects are read-only. Note: Contained primitive types are always immutable.

Specified by:

isMadeReadOnly in interface DataComplex

Returns:

whether this object and recursively contained complex objects are read-only.

getDataList

public DataList getDataList(int index)

Returns the element at the specified position cast to a DataList.

Parameters:

index - of the element to return.

Returns:

the element at the specified position cast to a DataList.

getDataMap

public DataMap getDataMap(int index)

Returns the element at the specified position cast to a DataMap.

Parameters:

index - of the element to return.

Returns:

the element at the specified position cast to a DataMap.

startInstrumentingAccess

public void startInstrumentingAccess()

Description copied from interface: Instrumentable

Sets the state of this Instrumentable to start instrumenting data access. The types of accesses that are instrumented depends on the actual concrete classes that implement this interface. The minimum expectation is that read access via Collection#get, Map#get, and Map.containsKey(Object) are instrumented as an access.

Specified by:

startInstrumentingAccess in interface Instrumentable

stopInstrumentingAccess

public void stopInstrumentingAccess()

Description copied from interface: Instrumentable

Sets the state of this Instrumentable to stop instrumenting data access.

Specified by:

stopInstrumentingAccess in interface Instrumentable

clearInstrumentedData

public void clearInstrumentedData()

Description copied from interface: Instrumentable

Clear tracked data.

Specified by:

clearInstrumentedData in interface Instrumentable

collectInstrumentedData

public void collectInstrumentedData(java.lang.StringBuilder keyPrefix,
                                    java.util.Map<java.lang.String,java.util.Map<java.lang.String,java.lang.Object>> instrumentedData,
                                    boolean collectAllData)

Description copied from interface: Instrumentable

Collect either all the data in this and contained Instrumentable or only the keys or indices that have been marked as accessed depending on the collectAllData flag. The data is collected into the instrumentedData supplied. Each entry's key in the instrumentedData map is the fully qualified name of the accessed key or index. The fully qualified name is constructed by pre-pending the provided keyPrefix and the keys and indices of antecedent objects traversed to reach this particular key or index. Each entry's value in the instrumentedData map is another map. The minimum expectation is that the latter map has at least two entries, the "value" entry holds the String representation object identified by the fully qualified name, and the "timesAcessed" entry has the number of times the fully qualified name has been accessed. The number of times accessed may be null in case it is unknown how many times the key or index was accessed due to instrumentation limitations.

Specified by:

collectInstrumentedData in interface Instrumentable

Parameters:

keyPrefix - is the prefix to prepend to the fully qualified name of accessed keys and indices.

instrumentedData - provides the map to hold the output of the collected instrumented data, each map entry's key is the fully qualified name of the key or index accessed, and the map entry's value is another map that holds collected data.

collectAllData - indicates whether to collect all data in this and contained Instrumentable or only the keys or indices accessed.

dataComplexHashCode

public int dataComplexHashCode()

Description copied from interface: DataComplex

Returns the data complex hash code of this data complex object.

Specified by:

dataComplexHashCode in interface DataComplex

Returns:

the data complex hash code.