org.protelis.lang.interpreter.impl

Class AbstractPersistedTree<S,T>

java.lang.Object

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

org.protelis.lang.interpreter.impl.AbstractPersistedTree<S,T>

Type Parameters:

S - Superscript type

T - Annotation type

All Implemented Interfaces:

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

Direct Known Subclasses:

Eval, ShareCall

public abstract class AbstractPersistedTree<S,T>
extends AbstractProtelisAST<T>

Basic implementation of a persisted tree.

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractPersistedTree(Metadata metadata, java.util.List<ProtelisAST<?>> branches)
protected	AbstractPersistedTree(Metadata metadata, ProtelisAST<?>... branches)

Method Summary

Modifier and Type	Method and Description
protected S	loadState(ExecutionContext context, java.util.function.Supplier<S> ifAbsent) Retrieves the function state from last round, or produces a new state otherwise.
protected void	saveState(ExecutionContext context, S obj) Stores the function state for the next round.
java.lang.String	toString()

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

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.protelis.lang.interpreter.util.WithBytecode

getBytecode

Constructor Detail

AbstractPersistedTree

protected AbstractPersistedTree(Metadata metadata,
                                ProtelisAST<?>... branches)

Parameters:

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

branches - branches of this AbstractPersistedTree

AbstractPersistedTree

protected AbstractPersistedTree(Metadata metadata,
                                java.util.List<ProtelisAST<?>> branches)

Parameters:

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

branches - branches of this AbstractPersistedTree

Method Detail

loadState

protected final S loadState(ExecutionContext context,
                            java.util.function.Supplier<S> ifAbsent)

Retrieves the function state from last round, or produces a new state otherwise.

Parameters:

context - the ExecutionContext

ifAbsent - a 0-ary function producing the value if none is stored

Returns:

the previous state, if present, or the state computed by ifAbsent otherwise

saveState

protected final void saveState(ExecutionContext context,
                               S obj)

Stores the function state for the next round.

Parameters:

context - the ExecutionContext

obj - the state

toString

public java.lang.String toString()

Overrides:

toString in class AbstractProtelisAST<T>