*/
package org.opendaylight.yangtools.yang.parser.spi.meta;
+import java.util.Collection;
+import java.util.stream.Stream;
import org.eclipse.jdt.annotation.NonNull;
import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
+import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
+/**
+ * An entity capable of creating {@link DeclaredStatement} and {@link EffectiveStatement} instances for a particular
+ * type. This interface is usually realized as an implementation-specific combination with {@link StatementSupport}.
+ *
+ * @param <A> Argument type
+ * @param <D> Declared Statement representation
+ * @param <E> Effective Statement representation
+ */
public interface StatementFactory<A, D extends DeclaredStatement<A>, E extends EffectiveStatement<A, D>> {
/**
* Create a {@link DeclaredStatement} for specified context.
/**
* Create a {@link EffectiveStatement} for specified context.
*
- * @param ctx Statement context
- * @return An effective statement instance.
+ * @param stmt Effective capture of this statement's significant state
+ * @return An effective statement instance
+ */
+ @NonNull E createEffective(@NonNull Current<A, D> stmt,
+ Stream<? extends StmtContext<?, ?, ?>> declaredSubstatements,
+ Stream<? extends StmtContext<?, ?, ?>> effectiveSubstatements);
+
+ /**
+ * Create a {@link EffectiveStatement} copy of provided original for specified context.
+ *
+ * @param stmt Effective capture of this statement's significant state
+ * @param original Original effective statement
+ * @return An effective statement instance
+ * @throws NullPointerException if any argument is null
+ */
+ @NonNull E copyEffective(@NonNull Current<A, D> stmt, @NonNull E original);
+
+ /**
+ * Determine reactor copy behaviour of a statement instance. Implementations classes are required to determine
+ * their operations with regard to their statements being replicated into different contexts -- potentially sharing
+ * instantiations.
+ *
+ * <p>
+ * Implementations are examine {@code copy} as to whether it would result in the same semantics as {@code current}
+ * does, provided that {@code current}'s {@code substatements} are properly propagated.
+ *
+ * @param copy Copy of current effective context
+ * @param current Current effective context
+ * @param substatements Current effective substatements
+ * @return True if the differences between {@code copy} and {@code current} do not affect this statement's effective
+ * semantics.
+ * @throws NullPointerException if any argument is null
*/
- @NonNull E createEffective(@NonNull StmtContext<A, D, E> ctx);
+ boolean canReuseCurrent(@NonNull Current<A, D> copy, @NonNull Current<A, D> current,
+ @NonNull Collection<? extends EffectiveStatement<?, ?>> substatements);
}