The following example contains the definition of an ISO 8583 message
FieldBuilder fieldBuilder = FieldBuilder.builder(MsgFieldType.MSG)
.defineName("msg");
MsgField isoMsgField = fieldBuilder.getCurrentField();
MsgField mti = FieldBuilder.builder(MsgFieldType.VAL)
.defineName(MTI_NAME)
.defineBodyPacker(BcdBodyPacker.rightPaddingF())
.defineLen(2)
.defineParent(isoMsgField)
.getCurrentField();
MsgField bitmap = FieldBuilder.from(mti)
.createSibling(MsgFieldType.BIT_SET)
.defineName(BITMAP_NAME)
.defineHeaderBitmapPacker(IfbBitmapPacker.getInstance(16))
.getCurrentField();
FieldBuilder.from(bitmap)
.createChild(MsgFieldType.LEN_VAL)
.defineFieldNum(2)
.defineName(PAN_02_NAME)
.defineStringer(StringStringer.getInstance())
.defineBodyPacker(BcdBodyPacker.rightPaddingF())
.defineHeaderLengthPacker(EbcdicDecimalLengthPacker.getInstance(2));
FieldBuilder.from(bitmap)
.createChild(MsgFieldType.LEN_VAL)
.defineFieldNum(3)
.defineName(PROCESSING_CODE_03_NAME)
.defineBodyPacker(BcdBodyPacker.rightPaddingF())
.defineHeaderLengthPacker(BcdLengthPacker.getInstance(1));
Field58.defineField58(bitmap);
fieldBuilder.validateStructure();
// filling with data
ValueHolder valueHolder = ValueHolder.newInstance(isoMsgField);
String mtiValue = "0200";
valueHolder.jumpToChild(MTI_NAME).setValue(mtiValue);
String pan = "123456781234567";
String processingCode = "32";
valueHolder.jumpToSibling(BITMAP_NAME)
.jumpToChild(PAN_02_NAME).setValue(pan)
.jumpToSibling(PROCESSING_CODE_03_NAME).setValue(processingCode);
fillField58(valueHolder);
// packing
byte[] bytes = valueHolder.jumpToRoot().pack();
String expectedBitmapHex = "E0000000000000400000000000000000";
String expectedPanLengthHex = "F0F8";
char padding = BcdBodyPacker.FILLER_F;
String expectedProcessingCodeLenHex = "01";
String expectedHex =
mtiValue +
expectedBitmapHex +
expectedPanLengthHex + pan + padding +
expectedProcessingCodeLenHex + processingCode;
String packedHex = HexService.bytesToHex(bytes);
assertTrue(packedHex.startsWith(expectedHex));
// unpacking
MsgValue msgValue = ValueHolder.unpack(bytes, 0, isoMsgField);
assertEquals(2, msgValue.getChildren().size());
// data browsing
MsgPair rootPair = ValueHolder.newInstance(msgValue, isoMsgField).getCurrentPair();
assertNotNull(rootPair);
String mtiString = ValueHolder.newInstance(rootPair).jumpToChild(MTI_NAME).getValue(String.class);
assertEquals(mtiValue, mtiString);
MsgPair bitmapPair = ValueHolder.newInstance(rootPair).jumpToChild(BITMAP_NAME).getCurrentPair();
assertNotNull(bitmap);
ValueHolder panValueHolder = ValueHolder.newInstance(bitmapPair).jumpToChild(PAN_02_NAME);
assertNotNull(panValueHolder);
String unpackedPanString = panValueHolder.getValue(String.class);
assertEquals(pan, unpackedPanString);The message definition can be described as XML by calling the DumpService.dumpMsgField(isoMsgField) method
<f type="MSG" name="msg">
<f type="VAL" name="mti" bodyPacker="BcdBodyPacker" len="2"/>
<f type="BIT_SET" name="bitmap" bitMapPacker="IfbBitmapPacker">
<f type="LEN_VAL" fieldNum="2" name="PAN_02" lengthPacker="EbcdicDecimalLengthPacker" bodyPacker="BcdBodyPacker"/>
<f type="LEN_VAL" fieldNum="3" name="Processing_code_03" lengthPacker="BcdLengthPacker" bodyPacker="BcdBodyPacker"/>
<f type="LEN_VAL" fieldNum="58" name="field_58" lengthPacker="EbcdicDecimalLengthPacker" maxLen="999" childTagPacker="EbcdicDecimalTagPacker(2)" childLenPacker="EbcdicDecimalLengthPacker">
<f type="LEN_TAG_VAL" tag="35" name="rate_request_reference" bodyPacker="AsciiBodyPacker"/>
<f type="LEN_TAG_VAL" tag="37" name="dcc_data">
<f type="VAL" name="dcc_status" bodyPacker="EbcdicBodyPacker" len="1"/>
<f type="VAL" name="currency_code" bodyPacker="EbcdicBodyPacker" len="3"/>
<f type="VAL" name="transaction_amount" bodyPacker="EbcdicBodyPacker" len="12"/>
<f type="VAL" name="conversion_rate" bodyPacker="EbcdicBodyPacker" len="8"/>
</f>
<f type="LEN_TAG_VAL" tag="53" name="non_loyalty_group" bodyPacker="EbcdicBodyPacker"/>
<f type="LEN_TAG_VAL" tag="90" name="90" bodyPacker="EbcdicBodyPacker"/>
<f type="LEN_TAG_VAL" tag="92" name="92" bodyPacker="EbcdicBodyPacker"/>
<f type="LEN_TAG_VAL" tag="93" name="93" bodyPacker="EbcdicBodyPacker"/>
<f type="LEN_TAG_VAL" tag="95" name="95" bodyPacker="EbcdicBodyPacker"/>
<f type="LEN_TAG_VAL" tag="97" name="97" bodyPacker="EbcdicBodyPacker"/>
<f type="LEN_TAG_VAL" tag="98" name="pos_terminal_capabilities" bodyPacker="EbcdicBodyPacker"/>
</f>
</f>
</f>The message values can be described as XML by calling the DumpService.dumpMsgValue(isoMsgField, msgValue, false) method
<f name="msg">
<f name="mti" val="0200"/>
<f name="bitmap" bitmapHex="E0000000000000400000000000000000" bitSet="{1, 2, 3, 58}">
<f name="PAN_02" fieldNum="2" val="123456781234567" lenHex="F0F8" valHex="123456781234567F"/>
<f name="Processing_code_03" fieldNum="3" val="32" lenHex="01"/>
<f name="field_58" fieldNum="58" lenHex="F0F6F9">
<f name="rate_request_reference" tag="35" val="018F1AEE03E404843C" lenHex="F0F2F0" tagHex="F3F5" valHex="303138463141454530334534303438343343"/>
<f name="dcc_data" tag="37" lenHex="F0F2F6" tagHex="F3F7">
<f name="dcc_status" val="U" valHex="E4"/>
<f name="currency_code" val="978" valHex="F9F7F8"/>
<f name="transaction_amount" val="000000005555" valHex="F0F0F0F0F0F0F0F0F5F5F5F5"/>
<f name="conversion_rate" val="40011670" valHex="F4F0F0F1F1F6F7F0"/>
</f>
<f name="non_loyalty_group" tag="53" val="003021" lenHex="F0F0F8" tagHex="F5F3" valHex="F0F0F3F0F2F1"/>
<f name="pos_terminal_capabilities" tag="98" val="8" lenHex="F0F0F3" tagHex="F9F8" valHex="F8"/>
</f>
</f>
</f>The complete example is located on GitHub FieldBuilderTest.java.