A parent has children, and has methods for accessing them. The Parent class is never encountered except as the superclass for some other object.

Methods
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Included Modules
Class Public methods
new(parent=nil)

Constructor @param parent if supplied, will be set as the parent of this object

# File lib/rexml/parent.rb, line 13
def initialize parent=nil
  super(parent)
  @children = []
end
Instance Public methods
<<( object )
Alias for: push
[]( index )

Fetches a child at a given index @param index the Integer index of the child to fetch

# File lib/rexml/parent.rb, line 57
def []( index )
  @children[index]
end
[]=( *args )

Set an index entry. See Array#[]= @param index the index of the element to set @param opt either the object to set, or an Integer length @param child if opt is an Integer, this is the child to set @return the parent (self)

# File lib/rexml/parent.rb, line 70
def []=( *args )
  args[-1].parent = self
  @children[*args[0..-2]] = args[-1]
end
add( object )
Also aliased as: push
# File lib/rexml/parent.rb, line 18
def add( object )
  object.parent = self
  @children << object
  object
end
children()
Alias for: to_a
deep_clone()

Deeply clones this object. This creates a complete duplicate of this Parent, including all descendants.

# File lib/rexml/parent.rb, line 148
def deep_clone
  cl = clone()
  each do |child|
    if child.kind_of? Parent
      cl << child.deep_clone
    else
      cl << child.clone
    end
  end
  cl
end
delete( object )
# File lib/rexml/parent.rb, line 32
def delete( object )
  found = false
  @children.delete_if {|c| c.equal?(object) and found = true }
  object.parent = nil if found
  found ? object : nil
end
delete_at( index )
# File lib/rexml/parent.rb, line 47
def delete_at( index )
  @children.delete_at index
end
delete_if( &block )
# File lib/rexml/parent.rb, line 43
def delete_if( &block )
  @children.delete_if(&block)
end
each(&block)
Also aliased as: each_child
# File lib/rexml/parent.rb, line 39
def each(&block)
  @children.each(&block)
end
each_child(&block)
Alias for: each
each_index( &block )
# File lib/rexml/parent.rb, line 51
def each_index( &block )
  @children.each_index(&block)
end
index( child )

Fetches the index of a given child @param child the child to get the index of @return the index of the child, or nil if the object is not a child of this parent.

# File lib/rexml/parent.rb, line 123
def index( child )
  count = -1
  @children.find { |i| count += 1 ; i.hash == child.hash }
  count
end
insert_after( child1, child2 )

Inserts an child after another child @param child1 this is either an xpath or an Element. If an Element, child2 will be inserted after child1 in the child list of the parent. If an xpath, child2 will be inserted after the first child to match the xpath. @param child2 the child to insert @return the parent (self)

# File lib/rexml/parent.rb, line 102
def insert_after( child1, child2 )
  if child1.kind_of? String
    child1 = XPath.first( self, child1 )
    child1.parent.insert_after child1, child2
  else
    ind = index(child1)+1
    child2.parent.delete(child2) if child2.parent
    @children[ind,0] = child2
    child2.parent = self
  end
  self
end
insert_before( child1, child2 )

Inserts an child before another child @param child1 this is either an xpath or an Element. If an Element, child2 will be inserted before child1 in the child list of the parent. If an xpath, child2 will be inserted before the first child to match the xpath. @param child2 the child to insert @return the parent (self)

# File lib/rexml/parent.rb, line 82
def insert_before( child1, child2 )
  if child1.kind_of? String
    child1 = XPath.first( self, child1 )
    child1.parent.insert_before child1, child2
  else
    ind = index(child1)
    child2.parent.delete(child2) if child2.parent
    @children[ind,0] = child2
    child2.parent = self
  end
  self
end
length()
Alias for: size
parent?()
# File lib/rexml/parent.rb, line 162
def parent?
  true
end
push( object )
Also aliased as: <<
Alias for: add
replace_child( to_replace, replacement )

Replaces one child with another, making sure the nodelist is correct @param to_replace the child to replace (must be a Child) @param replacement the child to insert into the nodelist (must be a Child)

# File lib/rexml/parent.rb, line 140
def replace_child( to_replace, replacement )
  @children.map! {|c| c.equal?( to_replace ) ? replacement : c }
  to_replace.parent = nil
  replacement.parent = self
end
size()

@return the number of children of this parent

Also aliased as: length
# File lib/rexml/parent.rb, line 130
def size
  @children.size
end
to_a()
Also aliased as: children
# File lib/rexml/parent.rb, line 115
def to_a
  @children.dup
end
unshift( object )
# File lib/rexml/parent.rb, line 27
def unshift( object )
  object.parent = self
  @children.unshift object
end