--- /dev/null
+/*
+ * Copyright (c) 2015, 2016 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.parser.stmt.reactor;
+
+import static java.util.Objects.requireNonNull;
+import static org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase.EFFECTIVE_MODEL;
+import static org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase.FULL_DECLARATION;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.MoreObjects.ToStringHelper;
+import com.google.common.base.Preconditions;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.function.Function;
+import javax.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.model.api.meta.IdentifierNamespace;
+import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder;
+import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
+import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceKeyCriterion;
+import org.opendaylight.yangtools.yang.parser.spi.meta.StatementNamespace;
+import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
+import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
+import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.ContextMutation;
+import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.OnNamespaceItemAdded;
+import org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.OnPhaseFinished;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class ModifierImpl implements ModelActionBuilder {
+ private static final Logger LOG = LoggerFactory.getLogger(ModifierImpl.class);
+
+ private final InferenceContext ctx = new InferenceContext() { };
+
+ private final Set<AbstractPrerequisite<?>> unsatisfied = new HashSet<>(1);
+ private final Set<AbstractPrerequisite<?>> mutations = new HashSet<>(1);
+
+ private InferenceAction action;
+ private boolean actionApplied = false;
+
+ private <D> AbstractPrerequisite<D> addReq(final AbstractPrerequisite<D> prereq) {
+ LOG.trace("Modifier {} adding prerequisite {}", this, prereq);
+ unsatisfied.add(prereq);
+ return prereq;
+ }
+
+ private <T> AbstractPrerequisite<T> addMutation(final AbstractPrerequisite<T> mutation) {
+ LOG.trace("Modifier {} adding mutation {}", this, mutation);
+ mutations.add(mutation);
+ return mutation;
+ }
+
+ private void checkNotRegistered() {
+ Preconditions.checkState(action == null, "Action was already registered.");
+ }
+
+ private boolean removeSatisfied() {
+ final Iterator<AbstractPrerequisite<?>> it = unsatisfied.iterator();
+ while (it.hasNext()) {
+ final AbstractPrerequisite<?> prereq = it.next();
+ if (prereq.isDone()) {
+ // We are removing current prerequisite from list.
+ LOG.trace("Modifier {} prerequisite {} satisfied", this, prereq);
+ it.remove();
+ }
+ }
+ return unsatisfied.isEmpty();
+ }
+
+ boolean isApplied() {
+ return actionApplied;
+ }
+
+ void failModifier() {
+ removeSatisfied();
+ action.prerequisiteFailed(unsatisfied);
+ action = null;
+ }
+
+ private void applyAction() {
+ Preconditions.checkState(!actionApplied);
+ action.apply(ctx);
+ actionApplied = true;
+ }
+
+ private <K, C extends StmtContext<?,?,?>, N extends StatementNamespace<K, ?, ?>> AbstractPrerequisite<C>
+ requiresCtxImpl(final StmtContext<?, ?, ?> context, final Class<N> namespace, final K key,
+ final ModelProcessingPhase phase) {
+ checkNotRegistered();
+
+ AddedToNamespace<C> addedToNs = new AddedToNamespace<>(phase);
+ addReq(addedToNs);
+ contextImpl(context).onNamespaceItemAddedAction(namespace, key, addedToNs);
+ return addedToNs;
+ }
+
+ private <K, C extends StmtContext<?,?,?>, N extends StatementNamespace<K, ?, ?>> AbstractPrerequisite<C>
+ requiresCtxImpl(final StmtContext<?, ?, ?> context, final Class<N> namespace,
+ final NamespaceKeyCriterion<K> criterion, final ModelProcessingPhase phase) {
+ checkNotRegistered();
+
+ AddedToNamespace<C> addedToNs = new AddedToNamespace<>(phase);
+ addReq(addedToNs);
+ contextImpl(context).onNamespaceItemAddedAction(namespace, phase, criterion, addedToNs);
+ return addedToNs;
+ }
+
+ private <C extends StmtContext<?, ?, ?>> AbstractPrerequisite<C> requiresCtxImpl(final C context,
+ final ModelProcessingPhase phase) {
+ checkNotRegistered();
+
+ PhaseFinished<C> phaseFin = new PhaseFinished<>();
+ addReq(phaseFin);
+ contextImpl(context).addPhaseCompletedListener(phase, phaseFin);
+ return phaseFin;
+ }
+
+ @SuppressWarnings({ "rawtypes", "unchecked" })
+ private <K, C extends StmtContext.Mutable<?, ?, ?>,
+ N extends IdentifierNamespace<K, ? extends StmtContext<?, ?, ?>>> AbstractPrerequisite<C> mutatesCtxImpl(
+ final StmtContext<?, ?, ?> context, final Class<N> namespace, final K key,
+ final ModelProcessingPhase phase) {
+ checkNotRegistered();
+
+ PhaseModificationInNamespace<C> mod = new PhaseModificationInNamespace<>(phase);
+ addReq(mod);
+ addMutation(mod);
+ contextImpl(context).onNamespaceItemAddedAction((Class) namespace, key, mod);
+ return mod;
+ }
+
+ private static StatementContextBase<?,?,?> contextImpl(final Object value) {
+ Preconditions.checkArgument(value instanceof StatementContextBase,
+ "Supplied context %s is not provided by this reactor.", value);
+ return StatementContextBase.class.cast(value);
+ }
+
+ boolean tryApply() {
+ Preconditions.checkState(action != null, "Action was not defined yet.");
+
+ if (removeSatisfied()) {
+ applyAction();
+ return true;
+ }
+ return false;
+ }
+
+ @Nonnull
+ @Override
+ public <C extends Mutable<?, ?, ?>, CT extends C> Prerequisite<C> mutatesCtx(final CT context,
+ final ModelProcessingPhase phase) {
+ return addMutation(new PhaseMutation<>(contextImpl(context), phase));
+ }
+
+ @Nonnull
+ @Override
+ public <A,D extends DeclaredStatement<A>,E extends EffectiveStatement<A, D>>
+ AbstractPrerequisite<StmtContext<A, D, E>> requiresCtx(final StmtContext<A, D, E> context,
+ final ModelProcessingPhase phase) {
+ return requiresCtxImpl(context, phase);
+ }
+
+
+ @Nonnull
+ @Override
+ public <K, N extends StatementNamespace<K, ?, ?>> Prerequisite<StmtContext<?, ?, ?>> requiresCtx(
+ final StmtContext<?, ?, ?> context, final Class<N> namespace, final K key,
+ final ModelProcessingPhase phase) {
+ return requiresCtxImpl(context, namespace, key, phase);
+ }
+
+ @Nonnull
+ @Override
+ public <K, N extends StatementNamespace<K, ?, ?>> Prerequisite<StmtContext<?, ?, ?>> requiresCtx(
+ final StmtContext<?, ?, ?> context, final Class<N> namespace, final NamespaceKeyCriterion<K> criterion,
+ final ModelProcessingPhase phase) {
+ return requiresCtxImpl(context, namespace, criterion, phase);
+ }
+
+ @Nonnull
+ @Override
+ public <D extends DeclaredStatement<?>> Prerequisite<D> requiresDeclared(
+ final StmtContext<?, ? extends D, ?> context) {
+ return requiresCtxImpl(context, FULL_DECLARATION).transform(StmtContext::buildDeclared);
+ }
+
+ @Nonnull
+ @Override
+ public <K, D extends DeclaredStatement<?>, N extends StatementNamespace<K, ? extends D, ?>> Prerequisite<D>
+ requiresDeclared(final StmtContext<?, ?, ?> context, final Class<N> namespace, final K key) {
+ final AbstractPrerequisite<StmtContext<?, D, ?>> rawContext = requiresCtxImpl(context, namespace, key,
+ FULL_DECLARATION);
+ return rawContext.transform(StmtContext::buildDeclared);
+ }
+
+ @Nonnull
+ @Override
+ public <K, D extends DeclaredStatement<?>, N extends StatementNamespace<K, ? extends D, ?>>
+ AbstractPrerequisite<StmtContext<?, D, ?>> requiresDeclaredCtx(final StmtContext<?, ?, ?> context,
+ final Class<N> namespace, final K key) {
+ return requiresCtxImpl(context, namespace, key, FULL_DECLARATION);
+ }
+
+ @Nonnull
+ @Override
+ public <E extends EffectiveStatement<?, ?>> Prerequisite<E> requiresEffective(
+ final StmtContext<?, ?, ? extends E> stmt) {
+ return requiresCtxImpl(stmt, EFFECTIVE_MODEL).transform(StmtContext::buildEffective);
+ }
+
+ @Nonnull
+ @Override
+ public <K, E extends EffectiveStatement<?, ?>, N extends StatementNamespace<K, ?, ? extends E>> Prerequisite<E>
+ requiresEffective(final StmtContext<?, ?, ?> context, final Class<N> namespace, final K key) {
+ final AbstractPrerequisite<StmtContext<?,?,E>> rawContext = requiresCtxImpl(context, namespace, key,
+ EFFECTIVE_MODEL);
+ return rawContext.transform(StmtContext::buildEffective);
+ }
+
+ @Nonnull
+ @Override
+ public <K, E extends EffectiveStatement<?, ?>, N extends StatementNamespace<K, ?, ? extends E>>
+ AbstractPrerequisite<StmtContext<?, ?, E>> requiresEffectiveCtx(final StmtContext<?, ?, ?> context,
+ final Class<N> namespace, final K key) {
+ return requiresCtxImpl(contextImpl(context), namespace, key, EFFECTIVE_MODEL);
+ }
+
+ @Nonnull
+ @Override
+ public <N extends IdentifierNamespace<?, ?>> Prerequisite<Mutable<?, ?, ?>> mutatesNs(
+ final Mutable<?, ?, ?> context, final Class<N> namespace) {
+ return addMutation(new NamespaceMutation<>(contextImpl(context), namespace));
+ }
+
+ @Nonnull
+ @Override
+ public <K, E extends EffectiveStatement<?, ?>, N extends IdentifierNamespace<K, ? extends StmtContext<?, ?, ?>>>
+ AbstractPrerequisite<Mutable<?, ?, E>> mutatesEffectiveCtx(final StmtContext<?, ?, ?> context,
+ final Class<N> namespace, final K key) {
+ return mutatesCtxImpl(context, namespace, key, EFFECTIVE_MODEL);
+ }
+
+ @Override
+ public void apply(final InferenceAction action) {
+ Preconditions.checkState(this.action == null, "Action already defined to %s", this.action);
+ this.action = Preconditions.checkNotNull(action);
+ }
+
+ private abstract class AbstractPrerequisite<T> implements Prerequisite<T> {
+ private boolean done = false;
+ private T value;
+
+ @Override
+ public final T resolve(final InferenceContext ctx) {
+ Preconditions.checkState(done);
+ Preconditions.checkArgument(ctx == ModifierImpl.this.ctx);
+ return value;
+ }
+
+ final boolean isDone() {
+ return done;
+ }
+
+ final boolean resolvePrereq(final T value) {
+ this.value = value;
+ this.done = true;
+ return isApplied();
+ }
+
+ final <O> Prerequisite<O> transform(final Function<? super T, O> transformation) {
+ return ctx -> transformation.apply(resolve(ctx));
+ }
+
+ @Override
+ public final String toString() {
+ return addToStringAttributes(MoreObjects.toStringHelper(this).omitNullValues()).toString();
+ }
+
+ ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
+ return toStringHelper.add("value", value);
+ }
+ }
+
+ private class PhaseMutation<C> extends AbstractPrerequisite<C> implements ContextMutation {
+ @SuppressWarnings("unchecked")
+ PhaseMutation(final StatementContextBase<?, ?, ?> context, final ModelProcessingPhase phase) {
+ context.addMutation(phase, this);
+ resolvePrereq((C) context);
+ }
+
+ @Override
+ public boolean isFinished() {
+ return isApplied();
+ }
+ }
+
+ private class PhaseFinished<C extends StmtContext<?, ?, ?>> extends AbstractPrerequisite<C>
+ implements OnPhaseFinished {
+ @SuppressWarnings("unchecked")
+ @Override
+ public boolean phaseFinished(final StatementContextBase<?, ?, ?> context, final ModelProcessingPhase phase) {
+ return resolvePrereq((C) context);
+ }
+ }
+
+ private class NamespaceMutation<N extends IdentifierNamespace<?,?>>
+ extends AbstractPrerequisite<Mutable<?, ?, ?>> {
+ NamespaceMutation(final StatementContextBase<?, ?, ?> ctx, final Class<N> namespace) {
+ resolvePrereq(ctx);
+ }
+ }
+
+ private class AddedToNamespace<C extends StmtContext<?,?,?>> extends AbstractPrerequisite<C>
+ implements OnNamespaceItemAdded, OnPhaseFinished {
+ private final ModelProcessingPhase phase;
+
+ AddedToNamespace(final ModelProcessingPhase phase) {
+ this.phase = requireNonNull(phase);
+ }
+
+ @Override
+ public void namespaceItemAdded(final StatementContextBase<?, ?, ?> context, final Class<?> namespace,
+ final Object key, final Object value) {
+ ((StatementContextBase<?, ?, ?>) value).addPhaseCompletedListener(phase, this);
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public boolean phaseFinished(final StatementContextBase<?, ?, ?> context, final ModelProcessingPhase phase) {
+ return resolvePrereq((C) context);
+ }
+
+ @Override
+ ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
+ return super.addToStringAttributes(toStringHelper).add("phase", phase);
+ }
+ }
+
+ private class PhaseModificationInNamespace<C extends Mutable<?,?,?>> extends AbstractPrerequisite<C>
+ implements OnNamespaceItemAdded, ContextMutation {
+ private final ModelProcessingPhase modPhase;
+
+ PhaseModificationInNamespace(final ModelProcessingPhase phase) {
+ Preconditions.checkArgument(phase != null, "Model processing phase must not be null");
+ this.modPhase = phase;
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public void namespaceItemAdded(final StatementContextBase<?, ?, ?> context, final Class<?> namespace,
+ final Object key, final Object value) {
+ StatementContextBase<?, ?, ?> targetCtx = contextImpl(value);
+ targetCtx.addMutation(modPhase, this);
+ resolvePrereq((C) targetCtx);
+ }
+
+ @Override
+ public boolean isFinished() {
+ return isApplied();
+ }
+ }
+}
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