Class ConstantExpressions

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.

Method Summary

Modifier and Type	Method	Description
Optional<ConstantExpressions.ConstantExpression>	constantExpression(ExpressionTree tree, VisitorState state)
static ConstantExpressions	fromFlags(ErrorProneFlags flags)
boolean	isSame(ExpressionTree aTree, ExpressionTree bTree, VisitorState state)	Returns whether aTree and bTree seem to correspond to the same expression.
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 Object

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

Method Details

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)

isSame

public boolean isSame(ExpressionTree aTree,
 ExpressionTree bTree,
 VisitorState state)

Returns whether aTree and bTree seem to correspond to the same expression.

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.