-/*
- * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License v1.0 which accompanies this distribution,
- * and is available at http://www.eclipse.org/legal/epl-v10.html
- */
-package org.opendaylight.yangtools.yang.data.impl.schema.tree;
-
-import java.util.Optional;
-import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
-import org.opendaylight.yangtools.yang.data.api.schema.tree.spi.TreeNode;
-import org.opendaylight.yangtools.yang.data.api.schema.tree.spi.Version;
-
-/**
- * An implementation of apply operation which fails to do anything, consistently. An instance of this class is used by
- * the data tree if it does not have a SchemaContext attached and hence cannot perform anything meaningful.
- */
-final class AlwaysFailOperation extends NonApplyDelegatedModificationApplyOperation {
- static final ModificationApplyOperation INSTANCE = new AlwaysFailOperation();
-
- private AlwaysFailOperation() {
-
- }
-
- @Override
- ModificationApplyOperation delegate() {
- throw ise();
- }
-
- @Override
- Optional<TreeNode> apply(final ModifiedNode modification, final Optional<TreeNode> currentMeta,
- final Version version) {
- throw ise();
- }
-
- @Override
- void checkApplicable(final ModificationPath path, final NodeModification modification,
- final Optional<TreeNode> current, final Version version) throws DataValidationFailedException {
- throw ise();
- }
-
- private static IllegalStateException ise() {
- return new IllegalStateException("Schema Context is not available.");
- }
-}