org.apache.commons.lang3.builder

Class ToStringStyle

java.lang.Object

org.apache.commons.lang3.builder.ToStringStyle

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

RecursiveToStringStyle, StandardToStringStyle

public abstract class ToStringStyle
extends java.lang.Object
implements java.io.Serializable

Controls String formatting for ToStringBuilder. The main public interface is always via ToStringBuilder.

These classes are intended to be used as Singletons. There is no need to instantiate a new style each time. A program will generally use one of the predefined constants on this class. Alternatively, the StandardToStringStyle class can be used to set the individual settings. Thus most styles can be achieved without subclassing.

If required, a subclass can override as many or as few of the methods as it requires. Each object type (from boolean to long to Object to int[]) has its own methods to output it. Most have two versions, detail and summary.

For example, the detail version of the array based methods will output the whole array, whereas the summary method will just output the array length.

If you want to format the output of certain objects, such as dates, you must create a subclass and override a method.

 public class MyStyle extends ToStringStyle {
   protected void appendDetail(StringBuffer buffer, String fieldName, Object value) {
     if (value instanceof Date) {
       value = new SimpleDateFormat("yyyy-MM-dd").format(value);
     }
     buffer.append(value);
   }
 }
 

Since:

1.0

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static ToStringStyle	DEFAULT_STYLE The default toString style.
static ToStringStyle	JSON_STYLE The JSON toString style.
static ToStringStyle	MULTI_LINE_STYLE The multi line toString style.
static ToStringStyle	NO_CLASS_NAME_STYLE The no class name toString style.
static ToStringStyle	NO_FIELD_NAMES_STYLE The no field names toString style.
static ToStringStyle	SHORT_PREFIX_STYLE The short prefix toString style.
static ToStringStyle	SIMPLE_STYLE The simple toString style.

Method Summary

Modifier and Type	Method and Description
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, boolean value) Append to the toString a boolean value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, boolean[] array, java.lang.Boolean fullDetail) Append to the toString a boolean array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, byte value) Append to the toString a byte value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, byte[] array, java.lang.Boolean fullDetail) Append to the toString a byte array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, char value) Append to the toString a char value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, char[] array, java.lang.Boolean fullDetail) Append to the toString a char array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, double value) Append to the toString a double value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, double[] array, java.lang.Boolean fullDetail) Append to the toString a double array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, float value) Append to the toString a float value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, float[] array, java.lang.Boolean fullDetail) Append to the toString a float array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, int value) Append to the toString an int value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, int[] array, java.lang.Boolean fullDetail) Append to the toString an int array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, long value) Append to the toString a long value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, long[] array, java.lang.Boolean fullDetail) Append to the toString a long array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, java.lang.Object[] array, java.lang.Boolean fullDetail) Append to the toString an Object array.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, java.lang.Object value, java.lang.Boolean fullDetail) Append to the toString an Object value, printing the full toString of the Object passed in.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, short value) Append to the toString a short value.
void	append(java.lang.StringBuffer buffer, java.lang.String fieldName, short[] array, java.lang.Boolean fullDetail) Append to the toString a short array.
void	appendEnd(java.lang.StringBuffer buffer, java.lang.Object object) Append to the toString the end of data indicator.
void	appendStart(java.lang.StringBuffer buffer, java.lang.Object object) Append to the toString the start of data indicator.
void	appendSuper(java.lang.StringBuffer buffer, java.lang.String superToString) Append to the toString the superclass toString.
void	appendToString(java.lang.StringBuffer buffer, java.lang.String toString) Append to the toString another toString.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_STYLE

public static final ToStringStyle DEFAULT_STYLE

The default toString style. Using the Person example from ToStringBuilder, the output would look like this:

 Person@182f0db[name=John Doe,age=33,smoker=false]
 

MULTI_LINE_STYLE

public static final ToStringStyle MULTI_LINE_STYLE

The multi line toString style. Using the Person example from ToStringBuilder, the output would look like this:

 Person@182f0db[
   name=John Doe
   age=33
   smoker=false
 ]
 

NO_FIELD_NAMES_STYLE

public static final ToStringStyle NO_FIELD_NAMES_STYLE

The no field names toString style. Using the Person example from ToStringBuilder, the output would look like this:

 Person@182f0db[John Doe,33,false]
 

SHORT_PREFIX_STYLE

public static final ToStringStyle SHORT_PREFIX_STYLE

The short prefix toString style. Using the Person example from ToStringBuilder, the output would look like this:

 Person[name=John Doe,age=33,smoker=false]
 

Since:

2.1

SIMPLE_STYLE

public static final ToStringStyle SIMPLE_STYLE

The simple toString style. Using the Person example from ToStringBuilder, the output would look like this:

 John Doe,33,false
 

NO_CLASS_NAME_STYLE

public static final ToStringStyle NO_CLASS_NAME_STYLE

The no class name toString style. Using the Person example from ToStringBuilder, the output would look like this:

 [name=John Doe,age=33,smoker=false]
 

Since:

3.4

JSON_STYLE

public static final ToStringStyle JSON_STYLE

The JSON toString style. Using the Person example from ToStringBuilder, the output would look like this:

 {"name": "John Doe", "age": 33, "smoker": true}
 

Note: Since field names are mandatory in JSON, this ToStringStyle will throw an UnsupportedOperationException if no field name is passed in while appending. Furthermore This ToStringStyle will only generate valid JSON if referenced objects also produce JSON when calling toString() on them.

Since:

3.4

See Also:

json.org

Method Detail

appendSuper

public void appendSuper(java.lang.StringBuffer buffer,
                        java.lang.String superToString)

Append to the toString the superclass toString.

NOTE: It assumes that the toString has been created from the same ToStringStyle.

A null superToString is ignored.

Parameters:

buffer - the StringBuffer to populate

superToString - the super.toString()

Since:

2.0

appendToString

public void appendToString(java.lang.StringBuffer buffer,
                           java.lang.String toString)

Append to the toString another toString.

NOTE: It assumes that the toString has been created from the same ToStringStyle.

A null toString is ignored.

Parameters:

buffer - the StringBuffer to populate

toString - the additional toString

Since:

2.0

appendStart

public void appendStart(java.lang.StringBuffer buffer,
                        java.lang.Object object)

Append to the toString the start of data indicator.

Parameters:

buffer - the StringBuffer to populate

object - the Object to build a toString for

appendEnd

public void appendEnd(java.lang.StringBuffer buffer,
                      java.lang.Object object)

Append to the toString the end of data indicator.

Parameters:

buffer - the StringBuffer to populate

object - the Object to build a toString for.

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   java.lang.Object value,
                   java.lang.Boolean fullDetail)

Append to the toString an Object value, printing the full toString of the Object passed in.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   long value)

Append to the toString a long value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   int value)

Append to the toString an int value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   short value)

Append to the toString a short value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   byte value)

Append to the toString a byte value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   char value)

Append to the toString a char value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   double value)

Append to the toString a double value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   float value)

Append to the toString a float value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   boolean value)

Append to the toString a boolean value.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

value - the value to add to the toString

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   java.lang.Object[] array,
                   java.lang.Boolean fullDetail)

Append to the toString an Object array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   long[] array,
                   java.lang.Boolean fullDetail)

Append to the toString a long array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   int[] array,
                   java.lang.Boolean fullDetail)

Append to the toString an int array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   short[] array,
                   java.lang.Boolean fullDetail)

Append to the toString a short array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   byte[] array,
                   java.lang.Boolean fullDetail)

Append to the toString a byte array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   char[] array,
                   java.lang.Boolean fullDetail)

Append to the toString a char array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   double[] array,
                   java.lang.Boolean fullDetail)

Append to the toString a double array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   float[] array,
                   java.lang.Boolean fullDetail)

Append to the toString a float array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides

append

public void append(java.lang.StringBuffer buffer,
                   java.lang.String fieldName,
                   boolean[] array,
                   java.lang.Boolean fullDetail)

Append to the toString a boolean array.

Parameters:

buffer - the StringBuffer to populate

fieldName - the field name

array - the array to add to the toString

fullDetail - true for detail, false for summary info, null for style decides