io.flutter.util.Preconditions Class Reference

Static Public Member Functions
static< T > T	checkNotNull (T reference)
static void	checkState (boolean expression)
static void	checkState (boolean expression, @Nullable Object errorMessage)

Detailed Description

Static convenience methods that help a method or constructor check whether it was invoked correctly (that is, whether its preconditions were met).

Definition at line 13 of file Preconditions.java.

Member Function Documentation

checkNotNull()

static< T > T io.flutter.util.Preconditions.checkNotNull ( T  reference )

inlinestatic

Ensures that an object reference passed as a parameter to the calling method is not null.

Parameters

reference

an object reference

Returns

the non-null reference that was validated

Exceptions

NullPointerException

if reference is null

Definition at line 23 of file Preconditions.java.

                                                {
    if (reference == null) {
      throw new NullPointerException();
    }
    return reference;
  }

checkState() [1/2]

static void io.flutter.util.Preconditions.checkState ( boolean  expression )

inlinestatic

Ensures the truth of an expression involving the state of the calling instance.

Parameters

expression

a boolean expression that must be checked to be true

Exceptions

IllegalStateException

if expression is false

Definition at line 36 of file Preconditions.java.

                                                    {
    if (!expression) {
      throw new IllegalStateException();
    }
  }

checkState() [2/2]

static void io.flutter.util.Preconditions.checkState ( boolean  expression, @Nullable Object  errorMessage  )

inlinestatic

Ensures the truth of an expression involving the state of the calling instance.

Parameters

expression	a boolean expression that must be checked to be true
errorMessage	the exception message to use if the check fails; will be converted to a string using String#valueOf(Object)

Exceptions

IllegalStateException

if expression is false

Definition at line 50 of file Preconditions.java.

                                                                                   {
    if (!expression) {
      throw new IllegalStateException(String.valueOf(errorMessage));
    }
  }

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The documentation for this class was generated from the following file:

• shell/platform/android/io/flutter/util/Preconditions.java