question: return the first filter in the filter chain for this appender . the return value may be null if no is filter is set . concode_field_sep Layout layout concode_elem_sep Filter tailFilter concode_elem_sep String name concode_elem_sep Priority threshold concode_elem_sep Filter headFilter concode_elem_sep ErrorHandler errorHandler concode_elem_sep boolean closed concode_field_sep void setName concode_elem_sep String getName concode_elem_sep void setThreshold concode_elem_sep void clearFilters concode_elem_sep void setLayout concode_elem_sep void activateOptions concode_elem_sep Filter getFilter concode_elem_sep ErrorHandler getErrorHandler concode_elem_sep Layout getLayout concode_elem_sep void doAppend concode_elem_sep void setErrorHandler concode_elem_sep void addFilter concode_elem_sep boolean isAsSevereAsThreshold concode_elem_sep void finalize concode_elem_sep Priority getThreshold concode_elem_sep void append
target: Filter function ( ) { return headFilter ; }