com.google.protobuf.LazyStringList Maven / Gradle / Ivy
// Protocol Buffers - Google's data interchange format
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// https://developers.google.com/protocol-buffers/
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package com.google.protobuf;
import java.util.Collection;
import java.util.List;
/**
* An interface extending {@code List} that also provides access to the items of the list as
* UTF8-encoded ByteString or byte[] objects. This is used by the protocol buffer implementation to
* support lazily converting bytes parsed over the wire to String objects until needed and also
* increases the efficiency of serialization if the String was never requested as the ByteString or
* byte[] is already cached. The ByteString methods are used in immutable API only and byte[]
* methods used in mutable API only for they use different representations for string/bytes fields.
*
* @author [email protected] (Jon Perlow)
*/
public interface LazyStringList extends ProtocolStringList {
/**
* Returns the element at the specified position in this list as a ByteString.
*
* @param index index of the element to return
* @return the element at the specified position in this list
* @throws IndexOutOfBoundsException if the index is out of range ({@code index < 0 || index >=
* size()})
*/
ByteString getByteString(int index);
/**
* Returns the element at the specified position in this list as an Object that will either be a
* String or a ByteString.
*
* @param index index of the element to return
* @return the element at the specified position in this list
* @throws IndexOutOfBoundsException if the index is out of range ({@code index < 0 || index >=
* size()})
*/
Object getRaw(int index);
/**
* Returns the element at the specified position in this list as byte[].
*
* @param index index of the element to return
* @return the element at the specified position in this list
* @throws IndexOutOfBoundsException if the index is out of range ({@code index < 0 || index >=
* size()})
*/
byte[] getByteArray(int index);
/**
* Appends the specified element to the end of this list (optional operation).
*
* @param element element to be appended to this list
* @throws UnsupportedOperationException if the add operation is not supported by this
* list
*/
void add(ByteString element);
/**
* Appends the specified element to the end of this list (optional operation).
*
* @param element element to be appended to this list
* @throws UnsupportedOperationException if the add operation is not supported by this
* list
*/
void add(byte[] element);
/**
* Replaces the element at the specified position in this list with the specified element
* (optional operation).
*
* @param index index of the element to replace
* @param element the element to be stored at the specified position
* @throws UnsupportedOperationException if the set operation is not supported by this
* list IndexOutOfBoundsException if the index is out of range ({@code index < 0 || index >=
* size()})
*/
void set(int index, ByteString element);
/**
* Replaces the element at the specified position in this list with the specified element
* (optional operation).
*
* @param index index of the element to replace
* @param element the element to be stored at the specified position
* @throws UnsupportedOperationException if the set operation is not supported by this
* list IndexOutOfBoundsException if the index is out of range ({@code index < 0 || index >=
* size()})
*/
void set(int index, byte[] element);
/**
* Appends all elements in the specified ByteString collection to the end of this list.
*
* @param c collection whose elements are to be added to this list
* @return true if this list changed as a result of the call
* @throws UnsupportedOperationException if the addAllByteString operation is not
* supported by this list
*/
boolean addAllByteString(Collection c);
/**
* Appends all elements in the specified byte[] collection to the end of this list.
*
* @param c collection whose elements are to be added to this list
* @return true if this list changed as a result of the call
* @throws UnsupportedOperationException if the addAllByteArray operation is not
* supported by this list
*/
boolean addAllByteArray(Collection c);
/**
* Returns an unmodifiable List of the underlying elements, each of which is either a {@code
* String} or its equivalent UTF-8 encoded {@code ByteString} or byte[]. It is an error for the
* caller to modify the returned List, and attempting to do so will result in an {@link
* UnsupportedOperationException}.
*/
List getUnderlyingElements();
/**
* Merges all elements from another LazyStringList into this one. This method differs from {@link
* #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.
*/
void mergeFrom(LazyStringList other);
/**
* 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.
*/
List asByteArrayList();
/** Returns an unmodifiable view of the list. */
LazyStringList getUnmodifiableView();
}