+/*
+ * Copyright (c) 2020 PANTHEON.tech, s.r.o. 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 static com.google.common.base.Verify.verifyNotNull;
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.base.MoreObjects.ToStringHelper;
+import java.util.Optional;
+import org.eclipse.jdt.annotation.NonNull;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+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;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A forwarding {@link ModificationApplyOperation}. Useful for strategies which do not deal with data layout, but rather
+ * perform additional validation.
+ */
+abstract class AbstractValidation extends ModificationApplyOperation {
+ private static final Logger LOG = LoggerFactory.getLogger(AbstractValidation.class);
+
+ private final @NonNull ModificationApplyOperation delegate;
+
+ AbstractValidation(final ModificationApplyOperation delegate) {
+ this.delegate = requireNonNull(delegate);
+ }
+
+ @Override
+ public final Optional<ModificationApplyOperation> getChild(final PathArgument child) {
+ return delegate.getChild(child);
+ }
+
+ @Override
+ final ChildTrackingPolicy getChildPolicy() {
+ return delegate.getChildPolicy();
+ }
+
+ @Override
+ final void mergeIntoModifiedNode(final ModifiedNode node, final NormalizedNode<?, ?> value, final Version version) {
+ delegate.mergeIntoModifiedNode(node, value, version);
+ }
+
+ @Override
+ final void quickVerifyStructure(final NormalizedNode<?, ?> modification) {
+ delegate.quickVerifyStructure(modification);
+ }
+
+ @Override
+ final void recursivelyVerifyStructure(final NormalizedNode<?, ?> value) {
+ delegate.recursivelyVerifyStructure(value);
+ }
+
+ @Override
+ final Optional<? extends TreeNode> apply(final ModifiedNode modification,
+ final Optional<? extends TreeNode> storeMeta, final Version version) {
+ Optional<? extends TreeNode> ret = modification.getValidatedNode(this, storeMeta);
+ if (ret == null) {
+ // This might also mean the delegate is maintaining validation
+ if (delegate instanceof AbstractValidation) {
+ ret = modification.getValidatedNode(delegate, storeMeta);
+ if (ret != null) {
+ return ret;
+ }
+ }
+
+ // Deal with the result moving on us
+ ret = delegate.apply(modification, storeMeta, version);
+ ret.ifPresent(meta -> enforceOnData(meta.getData()));
+ }
+ return ret;
+ }
+
+ @Override
+ final void checkApplicable(final ModificationPath path, final NodeModification modification,
+ final Optional<? extends TreeNode> current, final Version version) throws DataValidationFailedException {
+ delegate.checkApplicable(path, modification, current, version);
+ if (!(modification instanceof ModifiedNode)) {
+ // FIXME: 7.0.0: turn this into a verify?
+ LOG.debug("Could not validate {}, does not implement expected class {}", modification, ModifiedNode.class);
+ return;
+ }
+
+ final ModifiedNode modified = (ModifiedNode) modification;
+ if (delegate instanceof AbstractValidation) {
+ checkApplicable(path, verifyNotNull(modified.getValidatedNode(delegate, current)));
+ return;
+ }
+
+ // We need to actually perform the operation to deal with merge in a sane manner. We know the modification
+ // is immutable, so the result of validation will probably not change. Note we should not be checking number
+ final Optional<? extends TreeNode> applied = delegate.apply(modified, current, version);
+ checkApplicable(path, applied);
+
+ // Everything passed. We now have a snapshot of the result node, it would be too bad if we just threw it out.
+ // We know what the result of an apply operation is going to be *if* the following are kept unchanged:
+ // - the 'current' node
+ // - the effective model context (therefore, the fact this object is associated with the modification)
+ //
+ // So let's stash the result. We will pick it up during apply operation.
+ modified.setValidatedNode(this, current, applied);
+ }
+
+ private void checkApplicable(final ModificationPath path, final Optional<? extends TreeNode> applied)
+ throws DataValidationFailedException {
+ if (applied.isPresent()) {
+ // We only enforce min/max on present data and rely on MandatoryLeafEnforcer to take care of the empty case
+ enforceOnData(path, applied.orElseThrow().getData());
+ }
+ }
+
+ @Override
+ void fullVerifyStructure(final NormalizedNode<?, ?> modification) {
+ delegate.fullVerifyStructure(modification);
+ enforceOnData(modification);
+ }
+
+ final @NonNull ModificationApplyOperation delegate() {
+ return delegate;
+ }
+
+ abstract void enforceOnData(ModificationPath path, NormalizedNode<?, ?> value)
+ throws DataValidationFailedException;
+
+ abstract void enforceOnData(@NonNull NormalizedNode<?, ?> data);
+
+ @Override
+ ToStringHelper addToStringAttributes(final ToStringHelper helper) {
+ return helper.add("delegate", delegate);
+ }
+}