ExprUnion (Closure Templates)

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java.lang.Object
- com.google.template.soy.soytree.ExprUnion

```
public final class ExprUnion
extends Object
```
Represents a Soy expression in either V2 or V1 syntax.
Important: Do not use outside of Soy code (treat as superpackage-private). If this expression is in V2 syntax, then getExpr() will return a nonnull expression tree. If this expression is in V1 syntax, then #getExpr() will return null. In either case, the expression text can be obtained from getExprText().

Constructor Summary

Constructors
Constructor and Description
`ExprUnion(ExprNode expr)` Constructor for an instance that represents a V2 expression.
`ExprUnion(ExprRootNode expr)` Constructor for an instance that represents a V2 expression.

Method Summary

Methods
Modifier and Type	Method and Description
`ExprUnion`	`copy(CopyState copyState)` Returns a (deep) clone of this object.
`static List<ExprUnion>`	`createList(List<? extends ExprRootNode> exprs)` Utility to create a list of `ExprUnion`s from a list of expression trees.
`ExprRootNode`	`getExpr()` Returns the expression tree if the expression is in V2 syntax, else null.
`String`	`getExprText()` Returns the expression text.
`void`	`reportV2ParseErrors(ErrorReporter reporter)` Adds all the errors from trying to parse this as a V2 expression to the given error reporter.

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

- Constructor Detail
  - ExprUnion
```
public ExprUnion(ExprNode expr)
```
    Constructor for an instance that represents a V2 expression.
    
    Parameters:
    expr - The expression tree.
  - ExprUnion
```
public ExprUnion(ExprRootNode expr)
```
    Constructor for an instance that represents a V2 expression.
    
    Parameters:
    expr - The expression tree.
- Method Detail
  - createList
```
public static List<ExprUnion> createList(List<? extends ExprRootNode> exprs)
```
    Utility to create a list of ExprUnions from a list of expression trees.
    
    Parameters:
    exprs - The list of expression trees.
    
    Returns:
    A new list of corresponding ExprUnions.
  - getExpr
```
public ExprRootNode getExpr()
```
    Returns the expression tree if the expression is in V2 syntax, else null.
  - getExprText
```
public String getExprText()
```
    Returns the expression text. This method works for both V2 and V1 expressions.
  - copy
```
public ExprUnion copy(CopyState copyState)
```
    Returns a (deep) clone of this object.
  - reportV2ParseErrors
```
public void reportV2ParseErrors(ErrorReporter reporter)
```
    Adds all the errors from trying to parse this as a V2 expression to the given error reporter.
    Guaranteed to add at least one error if getExpr() is null.

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