java.lang.Object
- com.google.errorprone.bugpatterns.threadsafety.ConstantExpressions

```
public final class ConstantExpressions
extends Object
```
Helper for establishing whether expressions correspond to a constant expression.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`ConstantExpressions.ConstantEquals`	Represents a binary equals call on two constant expressions.
`static class`	`ConstantExpressions.ConstantExpression`	Represents a constant expression.
`static interface`	`ConstantExpressions.ConstantExpressionVisitor`	Visitor for scanning over the components of a constant expression.
`static class`	`ConstantExpressions.PureMethodInvocation`	Represents both a constant method call or a constant field/local access, depending on the actual type of `symbol`.
`static class`	`ConstantExpressions.Truthiness`	Represents sets of things known to be true and false if a boolean statement evaluated true.

Constructor Summary

Constructors
Constructor Description

ConstantExpressions(WellKnownMutability wellKnownMutability)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Optional<ConstantExpressions.ConstantExpression>`	`constantExpression(ExpressionTree tree, VisitorState state)`
`static ConstantExpressions`	`fromFlags(ErrorProneFlags flags)`
`Optional<ConstantExpressions.PureMethodInvocation>`	`symbolizeImmutableExpression(ExpressionTree tree, VisitorState state)`	Returns a list of the methods called to get to this expression, as well as a terminating variable if needed.
`ConstantExpressions.Truthiness`	`truthiness(ExpressionTree tree, boolean not, VisitorState state)`	Scans an `ExpressionTree` to find anything guaranteed to be false or true if this expression is true.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConstantExpressions

public ConstantExpressions(WellKnownMutability wellKnownMutability)

Method Detail

fromFlags

public static ConstantExpressions fromFlags(ErrorProneFlags flags)

truthiness

public ConstantExpressions.Truthiness truthiness(ExpressionTree tree,
                                                 boolean not,
                                                 VisitorState state)

Scans an ExpressionTree to find anything guaranteed to be false or true if this expression is true.

constantExpression

public Optional<ConstantExpressions.ConstantExpression> constantExpression(ExpressionTree tree,
                                                                           VisitorState state)

symbolizeImmutableExpression

public Optional<ConstantExpressions.PureMethodInvocation> symbolizeImmutableExpression(ExpressionTree tree,
                                                                                       VisitorState state)

Returns a list of the methods called to get to this expression, as well as a terminating variable if needed.

Class ConstantExpressions