de.up.ling.irtg.codec

Class BottomUpTreeAutomatonInputCodec

java.lang.Object

de.up.ling.irtg.codec.InputCodec<TreeAutomaton>

de.up.ling.irtg.codec.BottomUpTreeAutomatonInputCodec

public class BottomUpTreeAutomatonInputCodec
extends InputCodec<TreeAutomaton>

A codec for reading tree automata written in Thomas Hanneforth's format for weighted bottom-up tree automata. Rules are written in the following format:

TOP(q1,q2) -> q0  <35133>

where TOP is the terminal symbol, and q0, q1, q2 are states. Each rule may optionally be followed by a weight in angle brackets. If no weight is specified, the codec assumes a rule weight of 1.

The final states of the automaton are listed before the first rule, i.e.:

q0
q1

The comment character is #; everything following a # symbol on the same line is ignored by the codec.

Note that the codec is currently limited in that one can write symbols like " and < in the original file format. But the codec will only accept symbols that start and end with " and have no " in between (and analogously for ').

Author:

koller

Constructor Summary

Constructors

Constructor and Description
BottomUpTreeAutomatonInputCodec()

Method Summary

Modifier and Type	Method and Description
TreeAutomaton	read(InputStream is) Reads an object from an input stream.

Methods inherited from class de.up.ling.irtg.codec.InputCodec

addOptions, getAllInputCodecs, getInputCodecByExtension, getInputCodecByName, getInputCodecByNameOrExtension, getInputCodecs, getMetadata, getOption, hasTrueOption, main, read, setOption, setProgressListener

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BottomUpTreeAutomatonInputCodec

public BottomUpTreeAutomatonInputCodec()

Method Detail

read

public TreeAutomaton read(InputStream is)
                   throws CodecParseException,
                          IOException

Description copied from class: InputCodec

Reads an object from an input stream.

Specified by:

read in class InputCodec<TreeAutomaton>

Returns:

Throws:

CodecParseException - if an error occurred while decoding the input stream into an object

IOException - if an error occurred while reading data from the input stream