Modifier and Type	Class and Description
public static class	MoreObjects.ToStringHelper Support class for `MoreObjects#toStringHelper`.

Access	Constructor and Description
private	MoreObjects()

Modifier and Type	Method and Description
public static <T> T	Returns: `first` if it is non-null; otherwise `second` if it is non-null firstNonNull(T first, T second) Returns the first of two given parameters that is not `null`, if either is, or otherwise throws a `NullPointerException`.
public static MoreObjects.ToStringHelper	toStringHelper(Object the object to generate the string for (typically `this`), used only for its class name self) Creates an instance of `ToStringHelper`.
public static MoreObjects.ToStringHelper	toStringHelper(Class<?> the `Class` of the instance clazz) Creates an instance of `ToStringHelper` in the same manner as `toStringHelper(Object)`, but using the simple name of `clazz` instead of using an instance's `Object#getClass()`.
public static MoreObjects.ToStringHelper	toStringHelper(String the name of the instance type className) Creates an instance of `ToStringHelper` in the same manner as `toStringHelper(Object)`, but using `className` instead of using an instance's `Object#getClass()`.

MoreObjects	back to summary
private MoreObjects()

Method Detail

firstNonNull back to summary

firstNonNull	back to summary
public static <T> T firstNonNull(T first, T second) Returns the first of two given parameters that is not `null`, if either is, or otherwise throws a `NullPointerException`. To find the first non-null element in an iterable, use `Iterables.find(iterable, Predicates.notNull())`. For varargs, use `Iterables.find(Arrays.asList(a, b, c, ...), Predicates.notNull())`, static importing as necessary. Note if `first` is represented as an `Optional`, this can be accomplished with `first.or(second)`. That approach also allows for lazy evaluation of the fallback instance, using `first.or(supplier)`. Java 9 users: use `java.util.Objects.requireNonNullElse(first, second)` instead. Returns:T `first` if it is non-null; otherwise `second` if it is non-null Exceptions NullPointerException: if both `first` and `second` are null Since 18.0 (since 3.0 as `Objects.firstNonNull()`).

public static <T> T firstNonNull(T first, T second)

Returns the first of two given parameters that is not null, if either is, or otherwise throws a NullPointerException.

To find the first non-null element in an iterable, use Iterables.find(iterable, Predicates.notNull()). For varargs, use Iterables.find(Arrays.asList(a, b, c, ...), Predicates.notNull()), static importing as necessary.

Note

if first is represented as an Optional, this can be accomplished with first.or(second). That approach also allows for lazy evaluation of the fallback instance, using first.or(supplier).

Java 9 users: use java.util.Objects.requireNonNullElse(first, second) instead.

Returns:T

first if it is non-null; otherwise second if it is non-null

Exceptions

NullPointerException:: if both first and second are null

Since

18.0 (since 3.0 as Objects.firstNonNull()).

toStringHelper back to summary

toStringHelper	back to summary
public static MoreObjects.ToStringHelper toStringHelper(Object self) Creates an instance of `ToStringHelper`. This is helpful for implementing `Object#toString()`. Specification by example: `// Returns "ClassName{}" MoreObjects.toStringHelper(this) .toString(); // Returns "ClassName{x=1}" MoreObjects.toStringHelper(this) .add("x", 1) .toString(); // Returns "MyObject{x=1}" MoreObjects.toStringHelper("MyObject") .add("x", 1) .toString(); // Returns "ClassName{x=1, y=foo}" MoreObjects.toStringHelper(this) .add("x", 1) .add("y", "foo") .toString(); // Returns "ClassName{x=1}" MoreObjects.toStringHelper(this) .omitNullValues() .add("x", 1) .add("y", null) .toString();` Note that in GWT, class names are often obfuscated. Parameters self:Object the object to generate the string for (typically `this`), used only for its class name Since 18.0 (since 2.0 as `Objects.toStringHelper()`).

public static MoreObjects.ToStringHelper toStringHelper(Object self)

Creates an instance of ToStringHelper.

This is helpful for implementing Object#toString(). Specification by example:

// Returns "ClassName{}"
MoreObjects.toStringHelper(this)
    .toString();

// Returns "ClassName{x=1}"
MoreObjects.toStringHelper(this)
    .add("x", 1)
    .toString();

// Returns "MyObject{x=1}"
MoreObjects.toStringHelper("MyObject")
    .add("x", 1)
    .toString();

// Returns "ClassName{x=1, y=foo}"
MoreObjects.toStringHelper(this)
    .add("x", 1)
    .add("y", "foo")
    .toString();

// Returns "ClassName{x=1}"
MoreObjects.toStringHelper(this)
    .omitNullValues()
    .add("x", 1)
    .add("y", null)
    .toString();

Note that in GWT, class names are often obfuscated.

Parameters

self:Object: the object to generate the string for (typically this), used only for its class name

Since

18.0 (since 2.0 as Objects.toStringHelper()).

toStringHelper back to summary

toStringHelper	back to summary
public static MoreObjects.ToStringHelper toStringHelper(Class<?> clazz) Creates an instance of `ToStringHelper` in the same manner as `toStringHelper(Object)`, but using the simple name of `clazz` instead of using an instance's `Object#getClass()`. Note that in GWT, class names are often obfuscated. Parameters clazz:Class<?> the `Class` of the instance Since 18.0 (since 7.0 as `Objects.toStringHelper()`).

public static MoreObjects.ToStringHelper toStringHelper(Class<?> clazz)

Creates an instance of ToStringHelper in the same manner as toStringHelper(Object), but using the simple name of clazz instead of using an instance's Object#getClass().

Note that in GWT, class names are often obfuscated.

Parameters

clazz:Class<?>: the Class of the instance

Since

18.0 (since 7.0 as Objects.toStringHelper()).

toStringHelper back to summary

toStringHelper	back to summary
public static MoreObjects.ToStringHelper toStringHelper(String className) Creates an instance of `ToStringHelper` in the same manner as `toStringHelper(Object)`, but using `className` instead of using an instance's `Object#getClass()`. Parameters className:String the name of the instance type Since 18.0 (since 7.0 as `Objects.toStringHelper()`).

public static MoreObjects.ToStringHelper toStringHelper(String className)

Creates an instance of ToStringHelper in the same manner as toStringHelper(Object), but using className instead of using an instance's Object#getClass().

Parameters

className:String: the name of the instance type

Since

18.0 (since 7.0 as Objects.toStringHelper()).

com.google.common.base back to summary

public final Class MoreObjects.ToStringHelper

Class Inheritance

extends Object

java.lang.Object
com.google.common.base.MoreObjects.ToStringHelper

Support class for MoreObjects#toStringHelper.

Author: Jason Lee
Since: 18.0 (since 2.0 as Objects.ToStringHelper).

Nested and Inner Type Summary

Modifier and Type	Class and Description
private static class	MoreObjects.ToStringHelper.UnconditionalValueHolder Holder object for values that cannot be null or empty (will be printed unconditionally).
pack-priv static class	MoreObjects.ToStringHelper.ValueHolder

Field Summary

Modifier and Type	Field and Description
private final String	className
private final MoreObjects.ToStringHelper.ValueHolder	holderHead
private MoreObjects.ToStringHelper.ValueHolder	holderTail
private boolean	omitEmptyValues
private boolean	omitNullValues

Constructor Summary

Access	Constructor and Description
private	ToStringHelper(String className) Use `MoreObjects#toStringHelper(Object)` to create an instance.

Method Summary

Modifier and Type	Method and Description
public MoreObjects.ToStringHelper	add(String name, Object value) Adds a name/value pair to the formatted output in `name=value` format.
public MoreObjects.ToStringHelper	add(String name, boolean value) Adds a name/value pair to the formatted output in `name=value` format.
public MoreObjects.ToStringHelper	add(String name, char value) Adds a name/value pair to the formatted output in `name=value` format.
public MoreObjects.ToStringHelper	add(String name, double value) Adds a name/value pair to the formatted output in `name=value` format.
public MoreObjects.ToStringHelper	add(String name, float value) Adds a name/value pair to the formatted output in `name=value` format.
public MoreObjects.ToStringHelper	add(String name, int value) Adds a name/value pair to the formatted output in `name=value` format.
public MoreObjects.ToStringHelper	add(String name, long value) Adds a name/value pair to the formatted output in `name=value` format.
private MoreObjects.ToStringHelper.ValueHolder	addHolder()
private MoreObjects.ToStringHelper	addHolder(Object value)
private MoreObjects.ToStringHelper	addHolder(String name, Object value)
private MoreObjects.ToStringHelper.UnconditionalValueHolder	addUnconditionalHolder()
private MoreObjects.ToStringHelper	addUnconditionalHolder(Object value)
private MoreObjects.ToStringHelper	addUnconditionalHolder(String name, Object value)
public MoreObjects.ToStringHelper	addValue(Object value) Adds an unnamed value to the formatted output.
public MoreObjects.ToStringHelper	addValue(boolean value) Adds an unnamed value to the formatted output.
public MoreObjects.ToStringHelper	addValue(char value) Adds an unnamed value to the formatted output.
public MoreObjects.ToStringHelper	addValue(double value) Adds an unnamed value to the formatted output.
public MoreObjects.ToStringHelper	addValue(float value) Adds an unnamed value to the formatted output.
public MoreObjects.ToStringHelper	addValue(int value) Adds an unnamed value to the formatted output.
public MoreObjects.ToStringHelper	addValue(long value) Adds an unnamed value to the formatted output.
private static boolean	isEmpty(Object value)
public MoreObjects.ToStringHelper	omitNullValues() Configures the `ToStringHelper` so `toString()` will ignore properties with null value.
public String	toString() Overrides java.lang.Object.toString. Returns a string in the format specified by `MoreObjects#toStringHelper(Object)`.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll wait wait wait

Field Detail

className	back to summary
private final String className

holderHead	back to summary
private final MoreObjects.ToStringHelper.ValueHolder holderHead

holderTail	back to summary
private MoreObjects.ToStringHelper.ValueHolder holderTail

omitEmptyValues	back to summary
private boolean omitEmptyValues

omitNullValues	back to summary
private boolean omitNullValues

Constructor Detail

ToStringHelper	back to summary
private ToStringHelper(String className) Use `MoreObjects#toStringHelper(Object)` to create an instance.

Method Detail

add back to summary

add	back to summary
public MoreObjects.ToStringHelper add(String name, Object value) Adds a name/value pair to the formatted output in `name=value` format. If `value` is `null`, the string `"null"` is used, unless `omitNullValues()` is called, in which case this name/value pair will not be added. Annotations @CanIgnoreReturnValue

public MoreObjects.ToStringHelper add(String name, Object value)

Adds a name/value pair to the formatted output in name=value format. If value is null, the string "null" is used, unless omitNullValues() is called, in which case this name/value pair will not be added.

Annotations

@CanIgnoreReturnValue

add back to summary

add	back to summary
public MoreObjects.ToStringHelper add(String name, boolean value) Adds a name/value pair to the formatted output in `name=value` format. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.add()`).

public MoreObjects.ToStringHelper add(String name, boolean value)

Adds a name/value pair to the formatted output in name=value format.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.add()).

add back to summary

add	back to summary
public MoreObjects.ToStringHelper add(String name, char value) Adds a name/value pair to the formatted output in `name=value` format. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.add()`).

public MoreObjects.ToStringHelper add(String name, char value)

Adds a name/value pair to the formatted output in name=value format.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.add()).

add back to summary

add	back to summary
public MoreObjects.ToStringHelper add(String name, double value) Adds a name/value pair to the formatted output in `name=value` format. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.add()`).

public MoreObjects.ToStringHelper add(String name, double value)

Adds a name/value pair to the formatted output in name=value format.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.add()).

add back to summary

add	back to summary
public MoreObjects.ToStringHelper add(String name, float value) Adds a name/value pair to the formatted output in `name=value` format. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.add()`).

public MoreObjects.ToStringHelper add(String name, float value)

Adds a name/value pair to the formatted output in name=value format.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.add()).

add back to summary

add	back to summary
public MoreObjects.ToStringHelper add(String name, int value) Adds a name/value pair to the formatted output in `name=value` format. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.add()`).

public MoreObjects.ToStringHelper add(String name, int value)

Adds a name/value pair to the formatted output in name=value format.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.add()).

add back to summary

add	back to summary
public MoreObjects.ToStringHelper add(String name, long value) Adds a name/value pair to the formatted output in `name=value` format. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.add()`).

public MoreObjects.ToStringHelper add(String name, long value)

Adds a name/value pair to the formatted output in name=value format.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.add()).

addHolder	back to summary
private MoreObjects.ToStringHelper.ValueHolder addHolder()

addHolder	back to summary
private MoreObjects.ToStringHelper addHolder(Object value) Annotations @CanIgnoreReturnValue

addHolder	back to summary
private MoreObjects.ToStringHelper addHolder(String name, Object value) Annotations @CanIgnoreReturnValue

addUnconditionalHolder	back to summary
private MoreObjects.ToStringHelper.UnconditionalValueHolder addUnconditionalHolder()

addUnconditionalHolder	back to summary
private MoreObjects.ToStringHelper addUnconditionalHolder(Object value) Annotations @CanIgnoreReturnValue

addUnconditionalHolder	back to summary
private MoreObjects.ToStringHelper addUnconditionalHolder(String name, Object value) Annotations @CanIgnoreReturnValue

addValue back to summary

addValue	back to summary
public MoreObjects.ToStringHelper addValue(Object value) Adds an unnamed value to the formatted output. It is strongly encouraged to use `add(String, Object)` instead and give value a readable name. Annotations @CanIgnoreReturnValue

public MoreObjects.ToStringHelper addValue(Object value)

Adds an unnamed value to the formatted output.

It is strongly encouraged to use add(String, Object) instead and give value a readable name.

Annotations

@CanIgnoreReturnValue

addValue back to summary

addValue	back to summary
public MoreObjects.ToStringHelper addValue(boolean value) Adds an unnamed value to the formatted output. It is strongly encouraged to use `add(String, boolean)` instead and give value a readable name. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.addValue()`).

public MoreObjects.ToStringHelper addValue(boolean value)

Adds an unnamed value to the formatted output.

It is strongly encouraged to use add(String, boolean) instead and give value a readable name.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.addValue()).

addValue back to summary

addValue	back to summary
public MoreObjects.ToStringHelper addValue(char value) Adds an unnamed value to the formatted output. It is strongly encouraged to use `add(String, char)` instead and give value a readable name. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.addValue()`).

public MoreObjects.ToStringHelper addValue(char value)

Adds an unnamed value to the formatted output.

It is strongly encouraged to use add(String, char) instead and give value a readable name.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.addValue()).

addValue back to summary

addValue	back to summary
public MoreObjects.ToStringHelper addValue(double value) Adds an unnamed value to the formatted output. It is strongly encouraged to use `add(String, double)` instead and give value a readable name. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.addValue()`).

public MoreObjects.ToStringHelper addValue(double value)

Adds an unnamed value to the formatted output.

It is strongly encouraged to use add(String, double) instead and give value a readable name.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.addValue()).

addValue back to summary

addValue	back to summary
public MoreObjects.ToStringHelper addValue(float value) Adds an unnamed value to the formatted output. It is strongly encouraged to use `add(String, float)` instead and give value a readable name. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.addValue()`).

public MoreObjects.ToStringHelper addValue(float value)

Adds an unnamed value to the formatted output.

It is strongly encouraged to use add(String, float) instead and give value a readable name.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.addValue()).

addValue back to summary

addValue	back to summary
public MoreObjects.ToStringHelper addValue(int value) Adds an unnamed value to the formatted output. It is strongly encouraged to use `add(String, int)` instead and give value a readable name. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.addValue()`).

public MoreObjects.ToStringHelper addValue(int value)

Adds an unnamed value to the formatted output.

It is strongly encouraged to use add(String, int) instead and give value a readable name.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.addValue()).

addValue back to summary

addValue	back to summary
public MoreObjects.ToStringHelper addValue(long value) Adds an unnamed value to the formatted output. It is strongly encouraged to use `add(String, long)` instead and give value a readable name. Annotations @CanIgnoreReturnValue Since 18.0 (since 11.0 as `Objects.ToStringHelper.addValue()`).

public MoreObjects.ToStringHelper addValue(long value)

Adds an unnamed value to the formatted output.

It is strongly encouraged to use add(String, long) instead and give value a readable name.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 11.0 as Objects.ToStringHelper.addValue()).

isEmpty	back to summary
private static boolean isEmpty(Object value)

omitNullValues back to summary

omitNullValues	back to summary
public MoreObjects.ToStringHelper omitNullValues() Configures the `ToStringHelper` so `toString()` will ignore properties with null value. The order of calling this method, relative to the `add()`/`addValue()` methods, is not significant. Annotations @CanIgnoreReturnValue Since 18.0 (since 12.0 as `Objects.ToStringHelper.omitNullValues()`).

public MoreObjects.ToStringHelper omitNullValues()

Configures the ToStringHelper so toString() will ignore properties with null value. The order of calling this method, relative to the add()/addValue() methods, is not significant.

Annotations

@CanIgnoreReturnValue

Since

18.0 (since 12.0 as Objects.ToStringHelper.omitNullValues()).

toString back to summary

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Returns a string in the format specified by `MoreObjects#toStringHelper(Object)`. After calling this method, you can keep adding more properties to later call toString() again and get a more complete representation of the same object; but properties cannot be removed, so this only allows limited reuse of the helper instance. The helper allows duplication of properties (multiple name/value pairs with the same name can be added). Returns:String Doc from java.lang.Object.toString. a string representation of the object Annotations @Override

public String toString()

Overrides java.lang.Object.toString.

Returns a string in the format specified by MoreObjects#toStringHelper(Object).

After calling this method, you can keep adding more properties to later call toString() again and get a more complete representation of the same object; but properties cannot be removed, so this only allows limited reuse of the helper instance. The helper allows duplication of properties (multiple name/value pairs with the same name can be added).

Returns:String

Doc from java.lang.Object.toString.

a string representation of the object

Annotations

@Override

com.google.common.base back to summary

private final Class MoreObjects.ToStringHelper.UnconditionalValueHolder

Class Inheritance

extends ValueHolder

java.lang.Object
com.google.common.base.MoreObjects.ToStringHelper.ValueHolder
com.google.common.base.MoreObjects.ToStringHelper.UnconditionalValueHolder

Holder object for values that cannot be null or empty (will be printed unconditionally). This helps to shortcut most calls to isEmpty(), which is important because the check for emptiness is relatively expensive. Use a subtype so this also doesn't need any extra storage.

Field Summary

Inherited from com.google.common.base.MoreObjects.ToStringHelper.ValueHolder:: name next value

Constructor Summary

Access	Constructor and Description
private	UnconditionalValueHolder()

Constructor Detail

UnconditionalValueHolder	back to summary
private UnconditionalValueHolder()

com.google.common.base back to summary

pack-priv Class MoreObjects.ToStringHelper.ValueHolder

Class Inheritance

extends Object

java.lang.Object
com.google.common.base.MoreObjects.ToStringHelper.ValueHolder

Known Direct Subclasses

com.google.common.base.MoreObjects.ToStringHelper.UnconditionalValueHolder

Field Summary

Modifier and Type	Field and Description
pack-priv String	name
pack-priv MoreObjects.ToStringHelper.ValueHolder	next
pack-priv Object	value

Constructor Summary

Access	Constructor and Description
pack-priv	ValueHolder()

Method Summary

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

name	back to summary
pack-priv String name Annotations @CheckForNull

next	back to summary
pack-priv MoreObjects.ToStringHelper.ValueHolder next Annotations @CheckForNull

value	back to summary
pack-priv Object value Annotations @CheckForNull

Constructor Detail

ValueHolder	back to summary
pack-priv ValueHolder()