Module ibm.jzos

Package com.ibm.jzos.fields

Class StringField

java.lang.Object

com.ibm.jzos.fields.StringField

All Implemented Interfaces:

Field

public class StringField
extends Object
implements Field

A String Field.

Since:

2.1.0

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_ENCODING
static final char	HIGH_VALUE	The Unicode character that translates to EBCDIC 0xFF using Cp1047

Constructor Summary

Constructors

Constructor	Description
StringField(int offset, int length)	Construct an instance with trim=true, padLeft=false, and allowTruncation=true.
StringField(int offset, int length, boolean trim)	Construct an instance with padLeft=false and allowTruncation=true.
StringField(int offset, int length, boolean trim, boolean padLeft)	Construct an instance with allowTruncation=true.
StringField(int offset, int length, boolean trim, boolean padLeft, boolean allowTruncation)	Construct an instance.
StringField(int offset, int length, boolean trim, boolean padLeft, boolean allowTruncation, String encoding)	Construct an instance.

Method Summary

Modifier and Type	Method	Description
boolean	equals(String aString1, String aString2)	Compare two Strings, possible null, for equality.
int	getByteLength()	Answer the length of the field described by the receiver
String	getEncoding()	Return the configured (EBCDIC variant) encoding for this field.
int	getOffset()	Answer the offset of this field into some array of bytes
String	getString(byte[] bytes)	Return a String from the given byte array buffer, at the offset of this field.
String	getString(byte[] bytes, int bufOffset)	Return a String from the given byte array buffer, at the bufOffset + offset of this field.
boolean	isAllowTruncation()
boolean	isPadLeft()
boolean	isTrim()
static String	makeString(int len, char ch)	A static helper method which answers a new String of a given size and filled with a given character.
void	putString(String string, byte[] bytes)	Put a String into the given byte array buffer, at the offset of this field.
void	putString(String string, byte[] bytes, int bufOffset)	Put a String into the given byte array buffer, at the bufOffset + offset of this field.
void	setAllowTruncation(boolean allowTruncation)	Set whether or not to allow truncation of String values larger than the underlying byte length.
void	setByteLength(int len)	Sets the byte length of the field
void	setEncoding(String encoding)	Set the (EBCDIC variant) encoding for this field.
void	setOffset(int offset)
void	setPadLeft(boolean padLeft)	Set to true if the field will right-justify String values that are shorter than the underlying field length.
void	setTrim(boolean trim)	Set to true if the String value obtained from the underlying byte array are to be blank trimmed.

Methods inherited from class java.lang.Object

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

Field Details

HIGH_VALUE

public static final char HIGH_VALUE

The Unicode character that translates to EBCDIC 0xFF using Cp1047

See Also:

• Constant Field Values

DEFAULT_ENCODING

public static final String DEFAULT_ENCODING

See Also:

• Constant Field Values

Constructor Details

StringField

public StringField(int offset,
 int length)

Construct an instance with trim=true, padLeft=false, and allowTruncation=true.

Parameters:

offset - int the offset in some byte array to the start of this field

length - int the size of the field in bytes

StringField

public StringField(int offset,
 int length,
 boolean trim)

Construct an instance with padLeft=false and allowTruncation=true.

Parameters:

offset - int the offset in some byte array to the start of this field

length - int the size of the field in bytes

trim - true if the String returned from the underlying byte array is to be trimmed of leading (padLeft == true) or trailing (padLeft == false) blanks.

StringField

public StringField(int offset,
 int length,
 boolean trim,
 boolean padLeft)

Construct an instance with allowTruncation=true.

Parameters:

offset - int the offset in some byte array to the start of this field

length - int the size of the field in bytes

trim - true if the String returned from the underlying byte array is to be trimmed of leading (padLeft == true) or trailing (padLeft == false) blanks.

padLeft - true if small values are to be left padded with blanks

StringField

public StringField(int offset,
 int length,
 boolean trim,
 boolean padLeft,
 boolean allowTruncation)

Construct an instance.

Parameters:

offset - int the offset in some byte array to the start of this field

length - int the size of the field in bytes

trim - true if the String returned from the underlying byte array is to be trimmed of leading (padLeft == true) or trailing (padLeft == false) blanks.

padLeft - true if small values are to be left padded with blanks

allowTruncation - true if large Strings are to be right-truncated. If false an IllegalArgumentException will be thrown.

StringField

public StringField(int offset,
 int length,
 boolean trim,
 boolean padLeft,
 boolean allowTruncation,
 String encoding)

Construct an instance.

Parameters:

offset - int the offset in some byte array to the start of this field

length - int the size of the field in bytes

trim - true if the String returned from the underlying byte array is to be trimmed of leading (padLeft == true) or trailing (padLeft == false) blanks.

padLeft - true if small values are to be left padded with blanks

allowTruncation - true if large Strings are to be right-truncated. If false an IllegalArgumentException will be thrown.

encoding - the character set encoding. This is assumed to be an EBCDIC variant.

Method Details

makeString

public static String makeString(int len,
 char ch)

A static helper method which answers a new String of a given size and filled with a given character.

Parameters:

len - the length of the String to create

ch - the character which will fill the String

getByteLength

public int getByteLength()

Description copied from interface: Field

Answer the length of the field described by the receiver

Specified by:

getByteLength in interface Field

Returns:

int

See Also:

• Field.getByteLength()

setByteLength

public void setByteLength(int len)

Sets the byte length of the field

getOffset

public int getOffset()

Description copied from interface: Field

Answer the offset of this field into some array of bytes

Specified by:

getOffset in interface Field

Returns:

int

See Also:

• Field.getOffset()

setOffset

public void setOffset(int offset)

Specified by:

setOffset in interface Field

See Also:

• Field.setOffset(int)

getString

public String getString(byte[] bytes)

Return a String from the given byte array buffer, at the offset of this field.

Parameters:

bytes - the byte array

Returns:

String

getString

public String getString(byte[] bytes,
 int bufOffset)

Return a String from the given byte array buffer, at the bufOffset + offset of this field.

Parameters:

bytes - the byte array

bufOffset - the additional offset into the byte array

Returns:

String

putString

public void putString(String string,
 byte[] bytes)

Put a String into the given byte array buffer, at the offset of this field.

Parameters:

string - the String value

bytes - the byte array

Throws:

IllegalArgumentException - if the String value is too long to fit into the buffer and allowTruncation == false.

RuntimeException - if the configured encoding is not supported

putString

public void putString(String string,
 byte[] bytes,
 int bufOffset)

Put a String into the given byte array buffer, at the bufOffset + offset of this field.

Parameters:

string - the String value

bytes - the byte array

bufOffset - the additional offset into the byte array

Throws:

IllegalArgumentException - if the String value is too long to fit into the buffer and allowTruncation == false.

RuntimeException - if the configured encoding is not supported

getEncoding

public String getEncoding()

Return the configured (EBCDIC variant) encoding for this field. If the field encoding is null, check to see if the jzos.fields.string.encoding property is set. If not, use the default encoding (Cp1047).

Returns:

String encoding

setEncoding

public void setEncoding(String encoding)

Set the (EBCDIC variant) encoding for this field.

Parameters:

encoding - the EBCDIC encoding

isAllowTruncation

public boolean isAllowTruncation()

Returns:

true if this field allows truncation of String values larger than the underlying byte length.

setAllowTruncation

public void setAllowTruncation(boolean allowTruncation)

Set whether or not to allow truncation of String values larger than the underlying byte length. If set to false and an oversized String is supplied, an IllegalArgumentException will be thrown. If true, the String will be right-truncated to fit.

Parameters:

allowTruncation -

isPadLeft

public boolean isPadLeft()

Returns:

true if the field will right-justify String values that are shorter than the underlying field length.

setPadLeft

public void setPadLeft(boolean padLeft)

Set to true if the field will right-justify String values that are shorter than the underlying field length. If false, short String values are left justfied.

isTrim

public boolean isTrim()

Returns:

true if the String value obtained from the underlying byte array is blank trimmed. The trimming will occur on the left if padLeft == true, otherwise the trimming will occur on the right.

setTrim

public void setTrim(boolean trim)

Set to true if the String value obtained from the underlying byte array are to be blank trimmed. The trimming will occur on the left if padLeft == true, otherwise the trimming will occur on the right.

equals

public boolean equals(String aString1,
 String aString2)

Compare two Strings, possible null, for equality.

Parameters:

aString1 -

aString2 -

Returns:

boolean true if equal, false otherwise