org.apache.commons.lang.builder
public class ReflectionToStringBuilder extends ToStringBuilder
Assists in implementing {@link Object#toString()} methods using reflection.
This class uses reflection to determine the fields to append. Because these fields are usually private, the class uses {@link java.lang.reflect.AccessibleObject#setAccessible(java.lang.reflect.AccessibleObject[], boolean)} to change the visibility of the fields. This will fail under a security manager, unless the appropriate permissions are set up correctly.
A typical invocation for this method would look like:
public String toString() { return ReflectionToStringBuilder.toString(this); }
You can also use the builder to debug 3rd party objects:
System.out.println("An object: " + ReflectionToStringBuilder.toString(anObject));
A subclass can control field output by overriding the methods:
For example, this method does not include the password
field in the returned String
:
public String toString() { return (new ReflectionToStringBuilder(this) { protected boolean accept(Field f) { return super.accept(f) && !f.getName().equals("password"); } }).toString(); }
The exact format of the toString
is determined by the
{@link ToStringStyle} passed into the constructor.
Since: 2.0
Version: $Id: ReflectionToStringBuilder.java,v 1.15 2003/12/02 19:11:58 ggregory Exp $
Constructor Summary | |
---|---|
ReflectionToStringBuilder(Object object) Constructor. | |
ReflectionToStringBuilder(Object object, ToStringStyle style) Constructor. | |
ReflectionToStringBuilder(Object object, ToStringStyle style, StringBuffer buffer) Constructor. | |
ReflectionToStringBuilder(Object object, ToStringStyle style, StringBuffer buffer, Class reflectUpToClass, boolean outputTransients)
Constructor.
| |
ReflectionToStringBuilder(Object object, ToStringStyle style, StringBuffer buffer, Class reflectUpToClass, boolean outputTransients, boolean outputStatics)
Constructor.
|
Method Summary | |
---|---|
protected boolean | accept(Field field)
Returns whether or not to append the given Field .
|
protected void | appendFieldsIn(Class clazz) Appends the fields and values defined by the given object of the given Class. |
Class | getUpToClass() Gets the last super class to stop appending fields for. |
protected Object | getValue(Field field)
Calls |
boolean | isAppendStatics() Gets whether or not to append static fields. |
boolean | isAppendTransients() Gets whether or not to append transient fields. |
ToStringBuilder | reflectionAppendArray(Object array)
Append to the |
void | setAppendStatics(boolean appendStatics) Sets whether or not to append static fields. |
void | setAppendTransients(boolean appendTransients) Sets whether or not to append transient fields. |
void | setUpToClass(Class clazz) Sets the last super class to stop appending fields for. |
static String | toString(Object object)
This method uses reflection to build a suitable |
static String | toString(Object object, ToStringStyle style)
This method uses reflection to build a suitable |
static String | toString(Object object, ToStringStyle style, boolean outputTransients)
This method uses reflection to build a suitable |
static String | toString(Object object, ToStringStyle style, boolean outputTransients, boolean outputStatics)
This method uses reflection to build a suitable |
static String | toString(Object object, ToStringStyle style, boolean outputTransients, boolean outputStatics, Class reflectUpToClass)
This method uses reflection to build a suitable |
static String | toString(Object object, ToStringStyle style, boolean outputTransients, Class reflectUpToClass)
This method uses reflection to build a suitable |
String | toString() Gets the String built by this builder. |
Constructor.
This constructor outputs using the default style set with setDefaultStyle
.
Parameters: object
the Object to build a toString
for, must not
be null
Throws: IllegalArgumentException
if the Object passed in is null
Constructor.
If the style is null
, the default style is used.
Parameters: object
the Object to build a toString
for, must not
be null
style
the style of the toString
to create, may be
null
Throws: IllegalArgumentException
if the Object passed in is null
Constructor.
If the style is null
, the default style is used.
If the buffer is null
, a new one is created.
Parameters: object
the Object to build a toString
for style
the style of the toString
to create, may be
null
buffer
the StringBuffer
to populate, may be null
Throws: IllegalArgumentException
if the Object passed in is null
Deprecated: Use {@link #ReflectionToStringBuilder(Object,ToStringStyle,StringBuffer,Class,boolean,boolean)}.
Constructor.Parameters: object
the Object to build a toString
for style
the style of the toString
to create, may be
null
buffer
the StringBuffer
to populate, may be null
reflectUpToClass
the superclass to reflect up to (inclusive), may be null
outputTransients
whether to include transient fields
Parameters: object
the Object to build a toString
for style
the style of the toString
to create, may be
null
buffer
the StringBuffer
to populate, may be null
reflectUpToClass
the superclass to reflect up to (inclusive), may be null
outputTransients
whether to include transient fields outputStatics
whether to include static fields
Since: 2.1
Field
.
true
.
true
.
Parameters: field The Field to test.
Returns: Whether or not to append the given Field
.
Appends the fields and values defined by the given object of the given Class.
If a cycle is detected as an object is "toString()'ed", such
an object is rendered as if Object.toString()
had been
called and not implemented by the object.
Parameters: clazz The class of object parameter
Gets the last super class to stop appending fields for.
Returns: The last super class to stop appending fields for.
Calls java.lang.reflect.Field.get(Object)
.
Parameters: field The Field to query.
Returns: The Object from the given Field.
Throws: IllegalArgumentException see {@link java.lang.reflect.Field#get(Object)} IllegalAccessException see {@link java.lang.reflect.Field#get(Object)}
See Also: java.lang.reflect.Field#get(Object)
Gets whether or not to append static fields.
Returns: Whether or not to append static fields.
Since: 2.1
Gets whether or not to append transient fields.
Returns: Whether or not to append transient fields.
Append to the toString
an Object
array.
Parameters: array
the array to add to the toString
Returns: this
Sets whether or not to append static fields.
Parameters: appendStatics Whether or not to append static fields.
Since: 2.1
Sets whether or not to append transient fields.
Parameters: appendTransients Whether or not to append transient fields.
Sets the last super class to stop appending fields for.
Parameters: clazz The last super class to stop appending fields for.
This method uses reflection to build a suitable toString
using the default ToStringStyle
.
It uses AccessibleObject.setAccessible
to gain access to
private fields. This means that it will throw a security exception if
run under a security manager, if the permissions are not set up
correctly. It is also not as efficient as testing explicitly.
Transient members will be not be included, as they are likely derived. Static fields will not be included. Superclass fields will be appended.
Parameters: object the Object to be output
Returns: the String result
Throws: IllegalArgumentException
if the Object is null
This method uses reflection to build a suitable toString
.
It uses AccessibleObject.setAccessible
to gain access to
private fields. This means that it will throw a security exception if
run under a security manager, if the permissions are not set up
correctly. It is also not as efficient as testing explicitly.
Transient members will be not be included, as they are likely derived. Static fields will not be included. Superclass fields will be appended.
If the style is null
, the default ToStringStyle
is used.
Parameters: object
the Object to be output style
the style of the toString
to create, may be
null
Returns: the String result
Throws: IllegalArgumentException
if the Object or ToStringStyle
is null
This method uses reflection to build a suitable toString
.
It uses AccessibleObject.setAccessible
to gain access to
private fields. This means that it will throw a security exception if
run under a security manager, if the permissions are not set up
correctly. It is also not as efficient as testing explicitly.
If the outputTransients
is true
,
transient members will be output, otherwise they are ignored, as they
are likely derived fields, and not part of the value of the Object.
Static fields will not be included. Superclass fields will be appended.
If the style is null
, the default ToStringStyle
is used.
Parameters: object
the Object to be output style
the style of the toString
to create, may be
null
outputTransients
whether to include transient fields
Returns: the String result
Throws: IllegalArgumentException
if the Object is null
This method uses reflection to build a suitable toString
.
It uses AccessibleObject.setAccessible
to gain access to
private fields. This means that it will throw a security exception if
run under a security manager, if the permissions are not set up
correctly. It is also not as efficient as testing explicitly.
If the outputTransients
is true
,
transient fields will be output, otherwise they are ignored, as they are
likely derived fields, and not part of the value of the Object.
If the outputStatics
is true
, static
fields will be output, otherwise they are ignored.
Static fields will not be included. Superclass fields will be appended.
If the style is null
, the default ToStringStyle
is used.
Parameters: object
the Object to be output style
the style of the toString
to create, may be
null
outputTransients
whether to include transient fields outputStatics
whether to include transient fields
Returns: the String result
Throws: IllegalArgumentException
if the Object is null
Since: 2.1
This method uses reflection to build a suitable toString
.
It uses AccessibleObject.setAccessible
to gain access to
private fields. This means that it will throw a security exception if
run under a security manager, if the permissions are not set up
correctly. It is also not as efficient as testing explicitly.
If the outputTransients
is true
,
transient fields will be output, otherwise they are ignored, as they are
likely derived fields, and not part of the value of the Object.
If the outputStatics
is true
, static
fields will be output, otherwise they are ignored.
Superclass fields will be appended up to and including the specified
superclass. A null superclass is treated as java.lang.Object
.
If the style is null
, the default ToStringStyle
is used.
Parameters: object
the Object to be output style
the style of the toString
to create, may be
null
outputTransients
whether to include transient fields outputStatics
whether to include static fields reflectUpToClass
the superclass to reflect up to (inclusive), may be null
Returns: the String result
Throws: IllegalArgumentException
if the Object is null
Since: 2.1
Deprecated: Use {@link #toString(Object,ToStringStyle,boolean,boolean,Class)}
This method uses reflection to build a suitable toString
.
It uses AccessibleObject.setAccessible
to gain access to
private fields. This means that it will throw a security exception if
run under a security manager, if the permissions are not set up
correctly. It is also not as efficient as testing explicitly.
If the outputTransients
is true
,
transient members will be output, otherwise they are ignored, as they
are likely derived fields, and not part of the value of the Object.
Static fields will not be included. Superclass fields will be appended
up to and including the specified superclass. A null superclass is
treated as java.lang.Object
.
If the style is null
, the default ToStringStyle
is used.
Parameters: object
the Object to be output style
the style of the toString
to create, may be
null
outputTransients
whether to include transient fields reflectUpToClass
the superclass to reflect up to (inclusive), may be null
Returns: the String result
Throws: IllegalArgumentException
if the Object is null
Since: 2.0
Gets the String built by this builder.
Returns: the built string