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An extensible framework for creating ISO 8583 messages. Ported from OpenIso.Net http://code.google.com/p/openiso8583net/

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package org.bitbucket.openisoj;

import org.bitbucket.openisoj.fieldvalidator.IFieldValidator;

public class Field implements IField {

	public static IField getAsciiVar(int fieldNr, int lengthIdnicator, int maxLength, IFieldValidator validator)
			throws Exception {
		return new Field(fieldNr, FieldDescriptor.getAsciiVar(lengthIdnicator, maxLength, validator));
	}

	public static IField getBinFixed(int fieldNr, int packedLength) throws Exception {
		return new Field(fieldNr, FieldDescriptor.getBinaryFixed(packedLength));
	}

	protected IFieldDescriptor _fieldDescriptor;

	private int _fieldNr;

	private String _value;

	public Field(int fieldNumber, IFieldDescriptor fieldDescriptor) {
		_fieldNr = fieldNumber;
		_fieldDescriptor = fieldDescriptor;
	}

	public int getFieldNr() {
		return _fieldNr;
	}

	public int getPackedLength() throws Exception {
		return _fieldDescriptor.getPackedLenghth(_value);
	}

	public String getValue() {
		return _fieldDescriptor.getAdjuster() == null ? _value : _fieldDescriptor.getAdjuster().get(_value);
	}

	public void setValue(String value) {
		_value = _fieldDescriptor.getAdjuster() == null ? value : _fieldDescriptor.getAdjuster().set(value);

	}

	public byte[] toMsg() throws Exception {
		return _fieldDescriptor.pack(_fieldNr, _value);
	}

	@Override
	public String toString() {
		try {
			return toString("");
		} catch (Exception e) {
			return "ERROR IN DISPLAY!";
		}
	}

	public String toString(String prefix) throws Exception {
		return _fieldDescriptor.display(prefix, _fieldNr, _value);
	}

	public int unpack(byte[] msg, int offset) {
		UnpackObject obj = _fieldDescriptor.unpack(_fieldNr, msg, offset);
		_value = obj.data;
		return obj.offset;
	}

}