template.markdown.iso-8583-packer.doc.asciihex.ascii-length-packer.md Maven / Gradle / Ivy

# `AsciiLengthPacker` examples

Some MsgFields have defined the `LEN` subfield, see the [field-types.md](../field-types.md) description.

The following example shows how to define a field length in ASCII format
```Java
&&beginPlaceholder {
    "className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
    "description": "Example of ASCII length definition",
    "parameters": {
        "sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/asciihex/AsciiLengthPackerTest.java",
        "beginString": "            FieldBuilder.builder(MsgFieldType.LEN_VAL)",
        "endString": ".defineBodyPacker(AsciiBodyPacker.getInstance());",
        "indentation": ""
    }
} &&endPlaceholder
```

The field structure
```XML
&&beginPlaceholder {
    "className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
    "description": "MsgField dump",
    "parameters": {
        "sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
        "beginString": "AsciiLengthPackerTest - MsgField structure dump: ",
        "includeBeginString": "false",
        "endString": "\"/>",
        "indentation": ""
    }
} &&endPlaceholder
```

The following example shows packing and unpacking of the field value
```Java
&&beginPlaceholder {
    "className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
    "description": "Example of ASCII length packing and unpacking",
    "parameters": {
        "sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/asciihex/AsciiLengthPackerTest.java",
        "beginString": "        String value = \"abc\";",
        "endString": "assertEquals(value, msgValue.getBodyValue(String.class));",
        "indentation": "    "
    }
} &&endPlaceholder
```

The packed `FieldValue` with `lenHex` looks like the next example
```XML
&&beginPlaceholder {
    "className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
    "description": "MsgValue dump",
    "parameters": {
        "sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
        "beginString": "AsciiLengthPackerTest - MsgValue structure dump: ",
        "includeBeginString": "false",
        "endString": "\"/>",
        "indentation": ""
    }
} &&endPlaceholder
```

Some examples of packed values
```
&&beginPlaceholder {
    "className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
    "description": "Some examples of packed values",
    "parameters": {
        "sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
        "beginString": "Examples of integers packed with AsciiLengthPacker",
        "includeBeginString": "true",
        "endString": "Examples end.",
        "includeEndString": "false",
        "indentation": ""
    }
} &&endPlaceholder
```

More examples see [complex-example.md](../complex-example.md).