Package com.vaadin.collaborationengine

Class ListOperation

  • public class ListOperation
extends Object
    A list operation providing the list item value, its position, the scope and conditions that should be met for the operation to succeed.
    Author:
    Vaadin Ltd

    • Method Detail

      • insertFirst

        public static ListOperation insertFirst​(Object value)
        Creates a list operation to insert the given value as the first item of the list.
        Parameters:
        value - the value, not null
        Returns:
        the list operation, not null

      • insertLast

        public static ListOperation insertLast​(Object value)
        Creates a list operation to insert the given value as the last item of the list.
        Parameters:
        value - the value, not null
        Returns:
        the list operation, not null

      • insertBefore

        public static ListOperation insertBefore​(ListKey before,
                                         Object value)
        Creates a list operation to insert the given value just before the position specified by the given key.
        Parameters:
        before - the position key, not null
        value - the value, not null
        Returns:
        the list operation, not null

      • insertAfter

        public static ListOperation insertAfter​(ListKey after,
                                        Object value)
        Creates a list operation to insert the given value just after the position specified by the given key.
        Parameters:
        after - the position key, not null
        value - the value, not null
        Returns:
        the list operation, not null

      • insertBetween

        public static ListOperation insertBetween​(ListKey prev,
                                          ListKey next,
                                          Object value)
        Creates a list operation to insert the given value between the positions specified by the given keys. If the given keys are not adjacent, the operation will fail.
        Parameters:
        prev - the position of the previous item, not null
        next - the position of the next item, not null
        value - the value, not null
        Returns:
        the list operation, not null

      • withScope

        public ListOperation withScope​(EntryScope scope)
        Sets the scope of the item affected by this operation. If not set, the default scope will be EntryScope.TOPIC. Values with EntryScope.CONNECTION scope will be automatically removed once the connection to the topic which created them is deactivated.
        Parameters:
        scope - the scope, not null
        Returns:
        this operation, not null

      • ifNext

        public ListOperation ifNext​(ListKey key,
                            ListKey nextKey)
        Adds a condition that requires the specified nextKey to be right after the specified key when the operation is applied. A null nextKey can be used to represent the tail of the list.
        Parameters:
        key - the reference key, not null
        nextKey - the required key, or null to represent the tail of the list
        Returns:
        this operation, not null

      • ifLast

        public ListOperation ifLast​(ListKey key)
        Adds a condition that requires the specified key to be the last in the list.
        Parameters:
        key - the key, not null
        Returns:
        this operation, not null

      • ifPrev

        public ListOperation ifPrev​(ListKey key,
                            ListKey prevKey)
        Adds a condition that requires the specified prevKey to be right before the specified key when the operation is applied. A null prevKey can be used to represent the head of the list.
        Parameters:
        key - the reference key, not null
        prevKey - the required key, or null to represent the head of the list
        Returns:
        this operation, not null

      • ifFirst

        public ListOperation ifFirst​(ListKey key)
        Adds a condition that requires the specified key to be the first in the list.
        Parameters:
        key - the key, not null
        Returns:
        this operation, not null

      • ifEmpty

        public ListOperation ifEmpty()
        Adds a condition that requires the list to be empty.
        Returns:
        this operation, not null

      • ifNotEmpty

        public ListOperation ifNotEmpty()
        Adds a condition that requires the list not to be empty.
        Returns:
        this operation, not null