com.google.protobuf

Class LazyStringArrayList

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

com.google.protobuf.LazyStringArrayList

All Implemented Interfaces:

Internal.ProtobufList<String>, LazyStringList, ProtocolStringList, Iterable<String>, Collection<String>, List<String>, RandomAccess

public class LazyStringArrayList
extends AbstractList<E>
implements LazyStringList, RandomAccess

An implementation of LazyStringList that wraps an ArrayList. Each element is one of String, ByteString, or byte[]. It caches the last one requested which is most likely the one needed next. This minimizes memory usage while satisfying the most common use cases.

Note that this implementation is not synchronized. If multiple threads access an ArrayList instance concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification.) This is typically accomplished by synchronizing on some object that naturally encapsulates the list.

If the implementation is accessed via concurrent reads, this is thread safe. Conversions are done in a thread safe manner. It's possible that the conversion may happen more than once if two threads attempt to access the same element and the modifications were not visible to each other, but this will not result in any corruption of the list or change in behavior other than performance.

Author:

[email protected] (Jon Perlow)

Field Summary

Fields

Modifier and Type	Field and Description
static LazyStringList	EMPTY

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Constructor and Description
LazyStringArrayList()
LazyStringArrayList(int intialCapacity)
LazyStringArrayList(LazyStringList from)
LazyStringArrayList(List<String> from)

Method Summary

Methods

Modifier and Type	Method and Description
void	add(byte[] element) Appends the specified element to the end of this list (optional operation).
void	add(ByteString element) Appends the specified element to the end of this list (optional operation).
boolean	add(E e)
void	add(int index, String element)
boolean	addAll(Collection<? extends String> c)
boolean	addAll(int index, Collection<? extends String> c)
boolean	addAllByteArray(Collection<byte[]> c) Appends all elements in the specified byte[] collection to the end of this list.
boolean	addAllByteString(Collection<? extends ByteString> values) Appends all elements in the specified ByteString collection to the end of this list.
List<byte[]>	asByteArrayList() Returns a mutable view of this list.
List<ByteString>	asByteStringList() Returns a view of the data as a list of ByteStrings.
void	clear()
protected void	ensureIsMutable() Throws an UnsupportedOperationException if the list is immutable.
String	get(int index)
byte[]	getByteArray(int index) Returns the element at the specified position in this list as byte[].
ByteString	getByteString(int index) Returns the element at the specified position in this list as a ByteString.
List<?>	getUnderlyingElements() Returns an unmodifiable List of the underlying elements, each of which is either a String or its equivalent UTF-8 encoded ByteString or byte[].
LazyStringList	getUnmodifiableView() Returns an unmodifiable view of the list.
boolean	isModifiable() Returns whether this list can be modified via the publicly accessible List methods.
void	makeImmutable() Makes this list immutable.
void	mergeFrom(LazyStringList other) Merges all elements from another LazyStringList into this one.
String	remove(int index)
boolean	remove(Object o)
boolean	removeAll(Collection<?> c)
boolean	retainAll(Collection<?> c)
void	set(int index, byte[] s) Replaces the element at the specified position in this list with the specified element (optional operation).
void	set(int index, ByteString s) Replaces the element at the specified position in this list with the specified element (optional operation).
String	set(int index, String s)
int	size()

Methods inherited from class java.util.AbstractList

equals, hashCode, indexOf, iterator, lastIndexOf, listIterator, listIterator, removeRange, subList

Methods inherited from class java.util.AbstractCollection

contains, containsAll, isEmpty, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

add, contains, containsAll, equals, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, removeAll, retainAll, subList, toArray, toArray

Field Detail

EMPTY

public static final LazyStringList EMPTY

Constructor Detail

LazyStringArrayList

public LazyStringArrayList()

LazyStringArrayList

public LazyStringArrayList(int intialCapacity)

LazyStringArrayList

public LazyStringArrayList(LazyStringList from)

LazyStringArrayList

public LazyStringArrayList(List<String> from)

Method Detail

get

public String get(int index)

Specified by:

get in interface List<String>

Specified by:

get in class AbstractList<String>

size

public int size()

Specified by:

size in interface Collection<String>

Specified by:

size in interface List<String>

Specified by:

size in class AbstractCollection<String>

set

public String set(int index,
         String s)

Specified by:

set in interface List<String>

add

public void add(int index,
       String element)

Specified by:

add in interface List<String>

addAll

public boolean addAll(Collection<? extends String> c)

Specified by:

addAll in interface Collection<String>

Specified by:

addAll in interface List<String>

addAll

public boolean addAll(int index,
             Collection<? extends String> c)

Specified by:

addAll in interface List<String>

addAllByteString

public boolean addAllByteString(Collection<? extends ByteString> values)

Description copied from interface: LazyStringList

Appends all elements in the specified ByteString collection to the end of this list.

Specified by:

addAllByteString in interface LazyStringList

Parameters:

values - collection whose elements are to be added to this list

Returns:

true if this list changed as a result of the call

addAllByteArray

public boolean addAllByteArray(Collection<byte[]> c)

Description copied from interface: LazyStringList

Appends all elements in the specified byte[] collection to the end of this list.

Specified by:

addAllByteArray in interface LazyStringList

Parameters:

c - collection whose elements are to be added to this list

Returns:

true if this list changed as a result of the call

remove

public String remove(int index)

Specified by:

remove in interface List<String>

clear

public void clear()

Specified by:

clear in interface Collection<String>

Specified by:

clear in interface List<String>

add

public void add(ByteString element)

Description copied from interface: LazyStringList

Appends the specified element to the end of this list (optional operation).

Specified by:

add in interface LazyStringList

Parameters:

element - element to be appended to this list

add

public void add(byte[] element)

Description copied from interface: LazyStringList

Appends the specified element to the end of this list (optional operation).

Specified by:

add in interface LazyStringList

Parameters:

element - element to be appended to this list

getByteString

public ByteString getByteString(int index)

Description copied from interface: LazyStringList

Returns the element at the specified position in this list as a ByteString.

Specified by:

getByteString in interface LazyStringList

Parameters:

index - index of the element to return

Returns:

the element at the specified position in this list

getByteArray

public byte[] getByteArray(int index)

Description copied from interface: LazyStringList

Returns the element at the specified position in this list as byte[].

Specified by:

getByteArray in interface LazyStringList

Parameters:

index - index of the element to return

Returns:

the element at the specified position in this list

set

public void set(int index,
       ByteString s)

Description copied from interface: LazyStringList

Replaces the element at the specified position in this list with the specified element (optional operation).

Specified by:

set in interface LazyStringList

Parameters:

index - index of the element to replace

s - the element to be stored at the specified position

set

public void set(int index,
       byte[] s)

Description copied from interface: LazyStringList

Replaces the element at the specified position in this list with the specified element (optional operation).

Specified by:

set in interface LazyStringList

Parameters:

index - index of the element to replace

s - the element to be stored at the specified position

getUnderlyingElements

public List<?> getUnderlyingElements()

Description copied from interface: LazyStringList

Returns an unmodifiable List of the underlying elements, each of which is either a String or its equivalent UTF-8 encoded ByteString or byte[]. It is an error for the caller to modify the returned List, and attempting to do so will result in an UnsupportedOperationException.

Specified by:

getUnderlyingElements in interface LazyStringList

mergeFrom

public void mergeFrom(LazyStringList other)

Description copied from interface: LazyStringList

Merges all elements from another LazyStringList into this one. This method differs from List.addAll(Collection) on that underlying byte arrays are copied instead of reference shared. Immutable API doesn't need to use this method as byte[] is not used there at all.

Specified by:

mergeFrom in interface LazyStringList

asByteArrayList

public List<byte[]> asByteArrayList()

Description copied from interface: LazyStringList

Returns a mutable view of this list. Changes to the view will be made into the original list. This method is used in mutable API only.

Specified by:

asByteArrayList in interface LazyStringList

asByteStringList

public List<ByteString> asByteStringList()

Description copied from interface: ProtocolStringList

Returns a view of the data as a list of ByteStrings.

Specified by:

asByteStringList in interface ProtocolStringList

getUnmodifiableView

public LazyStringList getUnmodifiableView()

Description copied from interface: LazyStringList

Returns an unmodifiable view of the list.

Specified by:

getUnmodifiableView in interface LazyStringList

add

public boolean add(E e)

Specified by:

add in interface Collection<E>

Specified by:

add in interface List<E>

Overrides:

add in class AbstractList<E>

isModifiable

public boolean isModifiable()

Description copied from interface: Internal.ProtobufList

Returns whether this list can be modified via the publicly accessible List methods.

Specified by:

isModifiable in interface Internal.ProtobufList<E>

makeImmutable

public final void makeImmutable()

Description copied from interface: Internal.ProtobufList

Makes this list immutable. All subsequent modifications will throw an UnsupportedOperationException.

Specified by:

makeImmutable in interface Internal.ProtobufList<E>

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<E>

Specified by:

remove in interface List<E>

Overrides:

remove in class AbstractCollection<E>

removeAll

public boolean removeAll(Collection<?> c)

Specified by:

removeAll in interface Collection<E>

Specified by:

removeAll in interface List<E>

Overrides:

removeAll in class AbstractCollection<E>

retainAll

public boolean retainAll(Collection<?> c)

Specified by:

retainAll in interface Collection<E>

Specified by:

retainAll in interface List<E>

Overrides:

retainAll in class AbstractCollection<E>

ensureIsMutable

protected void ensureIsMutable()

Throws an UnsupportedOperationException if the list is immutable. Subclasses are responsible for invoking this method on mutate operations.