Package org.protelis.lang.interpreter.impl

Class If<T>

java.lang.Object

org.protelis.lang.interpreter.impl.AbstractProtelisAST<T>

org.protelis.lang.interpreter.impl.If<T>

Type Parameters:

T - the return type of this If

All Implemented Interfaces:

java.io.Serializable, ProtelisAST<T>, WithBytecode

public final class If<T>
extends AbstractProtelisAST<T>

Branch, restricting domain of true and false branches into their own aligned subspaces.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
If(Metadata metadata, ProtelisAST<java.lang.Boolean> cond, ProtelisAST<T> then, ProtelisAST<T> otherwise)

Method Summary

Modifier and Type	Method	Description
T	evaluate(ExecutionContext context)	Evaluates this AST node.
Bytecode	getBytecode()
ProtelisAST<java.lang.Boolean>	getConditionExpression()
ProtelisAST<T>	getElseExpression()
ProtelisAST<T>	getThenExpression()
protected boolean	isNullable()
java.lang.String	toString()

Methods inherited from class org.protelis.lang.interpreter.impl.AbstractProtelisAST

branchesToString, branchesToString, eval, forEach, forEachWithIndex, getBranch, getBranches, getBranchesNumber, getMetadata, getName, stringFor

Methods inherited from class java.lang.Object

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

Constructor Detail

If

public If(@Nonnull
          Metadata metadata,
          @Nonnull
          ProtelisAST<java.lang.Boolean> cond,
          @Nonnull
          ProtelisAST<T> then,
          @Nonnull
          ProtelisAST<T> otherwise)

Parameters:

metadata - A Metadata object containing information about the code that generated this AST node.

cond - condition

then - branch to execute if condition is true (erase otherwise)

otherwise - branch to execute if condition is false (erase otherwise)

Method Detail

evaluate

public T evaluate(ExecutionContext context)

Description copied from class: AbstractProtelisAST

Evaluates this AST node. This method can throw any exception, AbstractProtelisAST takes care of storing the necessary metadata.

Specified by:

evaluate in class AbstractProtelisAST<T>

Parameters:

context - the execution context

Returns:

the result of the evaluation

getBytecode

public Bytecode getBytecode()

Returns:

the element Bytecode

getConditionExpression

public ProtelisAST<java.lang.Boolean> getConditionExpression()

Returns:

the ProtelisAST of the condition expression

getElseExpression

public ProtelisAST<T> getElseExpression()

Returns:

the ProtelisAST of the else expression

getThenExpression

public ProtelisAST<T> getThenExpression()

Returns:

the ProtelisAST of the then expression

toString

public java.lang.String toString()

Overrides:

toString in class AbstractProtelisAST<T>

isNullable

protected boolean isNullable()

Overrides:

isNullable in class AbstractProtelisAST<T>

Returns:

true if this node can get annotated with null values - namely, if it is an interaction with Java