question: return the child of a node mapping to the input childname concode_field_sep HashMap<String,TrieNode> children concode_elem_sep TrieNode parent concode_elem_sep boolean property concode_elem_sep Logger LOG concode_elem_sep TrieNode rootNode concode_field_sep String[] getChildren concode_elem_sep TrieNode getParent concode_elem_sep boolean getProperty concode_elem_sep void deleteChild concode_elem_sep void setProperty concode_elem_sep String toString concode_elem_sep void setParent concode_elem_sep void deletePath concode_elem_sep void addChild concode_elem_sep void addPath concode_elem_sep String findMaxPrefix
target: TrieNode function ( String arg0 ) { synchronized ( children ) { if ( ! children . containsKey ( arg0 ) ) { return null ; } else { return children . get ( arg0 ) ; } } }