com.legstar.base.finder

Class CobolTypeFinder

java.lang.Object

com.legstar.base.finder.CobolTypeFinder

Direct Known Subclasses:

CobolComplexTypeFinder

public abstract class CobolTypeFinder
extends Object

A finder looks up the signature of a Cobol type in a byte stream.

This is useful when you are looking for a particular Cobol type (typically a complex type) in a byte stream that otherwise contains data you are not interested in.

Constructor Summary

Constructors

Constructor and Description
CobolTypeFinder()

Method Summary

Modifier and Type	Method and Description
abstract int	getSignatureLen()
int	indexOf(byte[] hostData, int start, int length) Lookup for the signature of a Cobol type.
abstract boolean	match(byte[] hostData, int start, int length) Match a Cobol type to an incoming host bytes set.

Methods inherited from class java.lang.Object

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

Constructor Detail

CobolTypeFinder

public CobolTypeFinder()

Method Detail

indexOf

public int indexOf(byte[] hostData,
                   int start,
                   int length)

Lookup for the signature of a Cobol type.

Attempts at finding the type one byte at a time delegating the matching to specialized classes.

Parameters:

hostData - the incoming host data where the matching type might appear

start - where to start looking in the incoming host data

length - where to stop looking in the incoming host data

Returns:

the position of the match or -1 if there is no match

match

public abstract boolean match(byte[] hostData,
                              int start,
                              int length)

Match a Cobol type to an incoming host bytes set.

Parameters:

hostData - the host bytes set

start - where to start matching

length - the size of the incoming host bytes set. This should be large enough to hold a signature but is not guaranteed to hold more than that.

Returns:

true if the Cobol type is compatible with the host bytes at the given start position

getSignatureLen

public abstract int getSignatureLen()

Returns:

the byte length of the signature (total number of bytes needed to match the type)