Interface LazyStringList

  • All Superinterfaces:
    Collection<String>, Iterable<String>, List<String>, ProtocolStringList
    All Known Implementing Classes:
    LazyStringArrayList, UnmodifiableLazyStringList


    public interface LazyStringList
    extends ProtocolStringList
    An interface extending List<String> 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.
    • Method Detail

      • getByteString

        ByteString getByteString(int index)
        Returns the element at the specified position in this list as a ByteString.
        Parameters:
        index - index of the element to return
        Returns:
        the element at the specified position in this list
        Throws:
        IndexOutOfBoundsException - if the index is out of range ( index < 0 || index >= size())
      • getByteArray

        byte[] getByteArray(int index)
        Returns the element at the specified position in this list as byte[].
        Parameters:
        index - index of the element to return
        Returns:
        the element at the specified position in this list
        Throws:
        IndexOutOfBoundsException - if the index is out of range ( index < 0 || index >= size())
      • add

        void add(ByteString element)
        Appends the specified element to the end of this list (optional operation).
        Parameters:
        element - element to be appended to this list
        Throws:
        UnsupportedOperationException - if the add operation is not supported by this list
      • add

        void add(byte[] element)
        Appends the specified element to the end of this list (optional operation).
        Parameters:
        element - element to be appended to this list
        Throws:
        UnsupportedOperationException - if the add operation is not supported by this list
      • set

        void set(int index,
                 ByteString element)
        Replaces the element at the specified position in this list with the specified element (optional operation).
        Parameters:
        index - index of the element to replace
        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 ( index < 0 || index >= size())
      • set

        void set(int index,
                 byte[] element)
        Replaces the element at the specified position in this list with the specified element (optional operation).
        Parameters:
        index - index of the element to replace
        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 ( index < 0 || index >= size())
      • addAllByteString

        boolean addAllByteString(Collection<? extends ByteString> c)
        Appends all elements in the specified ByteString collection to the end of this list.
        Parameters:
        c - collection whose elements are to be added to this list
        Returns:
        true if this list changed as a result of the call
        Throws:
        UnsupportedOperationException - if the addAllByteString operation is not supported by this list
      • addAllByteArray

        boolean addAllByteArray(Collection<byte[]> c)
        Appends all elements in the specified byte[] collection to the end of this list.
        Parameters:
        c - collection whose elements are to be added to this list
        Returns:
        true if this list changed as a result of the call
        Throws:
        UnsupportedOperationException - if the addAllByteArray operation is not supported by this list
      • getUnderlyingElements

        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[]. It is an error for the caller to modify the returned List, and attempting to do so will result in an UnsupportedOperationException.
      • mergeFrom

        void mergeFrom(LazyStringList other)
        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.
      • asByteArrayList

        List<byte[]> asByteArrayList()
        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.
      • getUnmodifiableView

        LazyStringList getUnmodifiableView()
        Returns an unmodifiable view of the list.