BuiltInVariableExpr (Data Binding Annotation Processor)

java.lang.Object
- android.databinding.tool.expr.Expr
- - android.databinding.tool.expr.IdentifierExpr
  - - android.databinding.tool.expr.BuiltInVariableExpr

All Implemented Interfaces:

android.databinding.tool.expr.VersionProvider, android.databinding.tool.processing.scopes.LocationScopeProvider, android.databinding.tool.processing.scopes.ScopeProvider

Direct Known Subclasses:

ViewFieldExpr
```
public class BuiltInVariableExpr
extends IdentifierExpr
```

Field Summary
- Fields inherited from class android.databinding.tool.expr.Expr
  KEY_END, KEY_JOIN, KEY_JOIN_END, KEY_JOIN_START, KEY_START, mChildren, NO_ID

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Expr`	`cloneToModel(ExprModel model)`
`protected java.util.List<Dependency>`	`constructDependencies()`
`protected android.databinding.tool.writer.KCode`	`generateCode()`
`java.lang.String`	`getInvertibleError()`
`boolean`	`isDeclared()`
`boolean`	`isDynamic()`	Whether the result of this expression can change or not.

Methods inherited from class android.databinding.tool.expr.IdentifierExpr
asPackage, computeUniqueKey, generateInverse, getName, getUserDefinedType, injectSafeUnboxing, resolveType, setDeclared, setUserDefinedType, toString

Methods inherited from class android.databinding.tool.expr.Expr
addJustMeToExecutionPath, addLocation, assertIsInvertible, canBeEvaluatedToAVariable, canBeInvalidated, cloneToModel, considerElevatingConditionals, constructDynamicChildrenDependencies, enableDirectInvalidation, getAllCalculationPaths, getChildren, getDefaultValue, getDependants, getDependencies, getId, getInvalidFlags, getLocations, getModel, getParents, getPredicateInvalidFlags, getReadSoFar, getRequirementFlagIndex, getRequirementId, getResolvedType, getShouldReadFlags, getShouldReadFlagsWithConditionals, getUniqueKey, getUpdateRegistrationCall, getVersion, hasConditionalDependant, hasId, hasNestedCannotRead, invalidateReadFlags, isBindingExpression, isConditional, isEqualityCheck, isIsUsedInCallback, isObservable, isRead, isUsed, join, join, markAsBindingExpression, markAsReadIfDone, markAsUsed, markAsUsedInCallback, markFlagsAsRead, onSwappedWith, provideScopeLocation, recursivelyInjectSafeUnboxing, resetResolvedType, resolveListeners, resolveTwoWayExpressions, safeUnboxChild, setId, setModel, setRequirementId, setUnwrapObservableFields, shouldReadNow, toCode, toExecutionPath, toExecutionPath, toExecutionPathInOrder, toExecutionPathInOrder, toFullCode, trimShouldReadFlags, unwrapChildTo, unwrapObservableField, unwrapObservableFieldChildren, updateExpr

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

- Method Detail
  - isDynamic
```
public boolean isDynamic()
```
    Description copied from class: Expr
    
    Whether the result of this expression can change or not. For example, 3 + 5 can not change vs 3 + x may change. Default implementations checks children and returns true if any of them returns true
    
    Overrides:
    
    isDynamic in class IdentifierExpr
    
    Returns:
    
    True if the result of this expression may change due to variables
  - constructDependencies
```
protected java.util.List<Dependency> constructDependencies()
```
    Overrides:
    
    constructDependencies in class IdentifierExpr
  - generateCode
```
protected android.databinding.tool.writer.KCode generateCode()
```
    Overrides:
    
    generateCode in class IdentifierExpr
  - isDeclared
```
public boolean isDeclared()
```
    Overrides:
    
    isDeclared in class IdentifierExpr
  - getInvertibleError
```
public java.lang.String getInvertibleError()
```
    Overrides:
    
    getInvertibleError in class IdentifierExpr
    
    Returns:
    
    The reason the expression wasn't invertible or null if it was invertible.
  - cloneToModel
```
public Expr cloneToModel(ExprModel model)
```
    Overrides:
    
    cloneToModel in class IdentifierExpr