/*
* Copyright (c) 2015 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 com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.base.Verify;
import com.google.common.collect.ImmutableSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.common.QNameModule;
import org.opendaylight.yangtools.yang.common.YangVersion;
import org.opendaylight.yangtools.yang.model.api.SchemaPath;
import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
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.StatementDefinition;
import org.opendaylight.yangtools.yang.model.api.stmt.AugmentStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.ChoiceStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.ConfigStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.DeviationStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.KeyStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.RefineStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
import org.opendaylight.yangtools.yang.model.api.stmt.UsesStatement;
import org.opendaylight.yangtools.yang.parser.spi.meta.CopyType;
import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour.NamespaceStorageNode;
import org.opendaylight.yangtools.yang.parser.spi.meta.NamespaceBehaviour.Registry;
import org.opendaylight.yangtools.yang.parser.spi.meta.QNameCacheNamespace;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
import org.opendaylight.yangtools.yang.parser.spi.source.AugmentToChoiceNamespace;
import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundlesNamespace;
import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundlesNamespace.ValidationBundleType;
import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class SubstatementContext, E extends EffectiveStatement> extends
StatementContextBase {
private static final Logger LOG = LoggerFactory.getLogger(SubstatementContext.class);
private final StatementContextBase, ?, ?> parent;
private final A argument;
/**
* config statements are not all that common which means we are performing a recursive search towards the root
* every time {@link #isConfiguration()} is invoked. This is quite expensive because it causes a linear search
* for the (usually non-existent) config statement.
*
* This field maintains a resolution cache, so once we have returned a result, we will keep on returning the same
* result without performing any lookups.
*/
private boolean haveConfiguration;
private boolean configuration;
private volatile SchemaPath schemaPath;
SubstatementContext(final StatementContextBase, ?, ?> parent, final ContextBuilder builder) {
super(builder);
this.parent = Preconditions.checkNotNull(parent, "Parent must not be null");
this.argument = builder.getDefinition().parseArgumentValue(this, builder.getRawArgument());
}
@SuppressWarnings("unchecked")
SubstatementContext(final SubstatementContext original, final QNameModule newQNameModule,
final StatementContextBase, ?, ?> newParent, final CopyType typeOfCopy) {
super(original);
this.parent = newParent;
if (newQNameModule != null) {
final A originalArg = original.argument;
if (originalArg instanceof QName) {
final QName originalQName = (QName) originalArg;
this.argument = (A) getFromNamespace(QNameCacheNamespace.class,
QName.create(newQNameModule, originalQName.getLocalName()));
} else if (StmtContextUtils.producesDeclared(original, KeyStatement.class)) {
this.argument = (A) StmtContextUtils.replaceModuleQNameForKey(
(StmtContext, KeyStatement, ?>) original, newQNameModule);
} else {
this.argument = original.argument;
}
} else {
this.argument = original.argument;
}
}
@Override
public StatementContextBase, ?, ?> getParentContext() {
return parent;
}
@Override
public NamespaceStorageNode getParentNamespaceStorage() {
return parent;
}
@Override
public Registry getBehaviourRegistry() {
return parent.getBehaviourRegistry();
}
@Nonnull
@Override
public RootStatementContext, ?, ?> getRoot() {
return parent.getRoot();
}
@Override
public A getStatementArgument() {
return argument;
}
@Override
public StatementContextBase, ?, ?> createCopy(final StatementContextBase, ?, ?> newParent,
final CopyType typeOfCopy) {
return createCopy(null, newParent, typeOfCopy);
}
@Override
public StatementContextBase createCopy(final QNameModule newQNameModule,
final StatementContextBase, ?, ?> newParent, final CopyType typeOfCopy) {
Preconditions.checkState(getCompletedPhase() == ModelProcessingPhase.EFFECTIVE_MODEL,
"Attempted to copy statement {} which has completed phase {}", this, getCompletedPhase());
final SubstatementContext copy = new SubstatementContext<>(this, newQNameModule, newParent, typeOfCopy);
copy.appendCopyHistory(typeOfCopy, this.getCopyHistory());
if (this.getOriginalCtx() != null) {
copy.setOriginalCtx(this.getOriginalCtx());
} else {
copy.setOriginalCtx(this);
}
definition().onStatementAdded(copy);
copy.copyStatements(this, newQNameModule, typeOfCopy);
return copy;
}
private void copyStatements(final SubstatementContext original, final QNameModule newQNameModule,
final CopyType typeOfCopy) {
final Collection> declared = original.declaredSubstatements();
final Collection> effective = original.effectiveSubstatements();
final Collection> buffer = new ArrayList<>(declared.size() + effective.size());
for (final StatementContextBase, ?, ?> stmtContext : declared) {
if (StmtContextUtils.areFeaturesSupported(stmtContext)) {
copySubstatement(stmtContext, newQNameModule, typeOfCopy, buffer);
}
}
for (final StatementContextBase, ?, ?> stmtContext : effective) {
copySubstatement(stmtContext, newQNameModule, typeOfCopy, buffer);
}
addEffectiveSubstatements(buffer);
}
private void copySubstatement(final StatementContextBase, ?, ?> stmtContext,
final QNameModule newQNameModule, final CopyType typeOfCopy,
final Collection> buffer) {
if (needToCopyByUses(stmtContext)) {
final StatementContextBase, ?, ?> copy = stmtContext.createCopy(newQNameModule, this, typeOfCopy);
LOG.debug("Copying substatement {} for {} as", stmtContext, this, copy);
buffer.add(copy);
} else if (isReusedByUses(stmtContext)) {
LOG.debug("Reusing substatement {} for {}", stmtContext, this);
buffer.add(stmtContext);
} else {
LOG.debug("Skipping statement {}", stmtContext);
}
}
// FIXME: revise this, as it seems to be wrong
private static final Set NOCOPY_FROM_GROUPING_SET = ImmutableSet.of(
YangStmtMapping.DESCRIPTION,
YangStmtMapping.REFERENCE,
YangStmtMapping.STATUS);
private static final Set REUSED_DEF_SET = ImmutableSet.of(
YangStmtMapping.TYPE,
YangStmtMapping.TYPEDEF,
YangStmtMapping.USES);
private static boolean needToCopyByUses(final StmtContext, ?, ?> stmtContext) {
final StatementDefinition def = stmtContext.getPublicDefinition();
if (REUSED_DEF_SET.contains(def)) {
LOG.debug("Will reuse {} statement {}", def, stmtContext);
return false;
}
if (NOCOPY_FROM_GROUPING_SET.contains(def)) {
return !YangStmtMapping.GROUPING.equals(stmtContext.getParentContext().getPublicDefinition());
}
LOG.debug("Will copy {} statement {}", def, stmtContext);
return true;
}
private static boolean isReusedByUses(final StmtContext, ?, ?> stmtContext) {
return REUSED_DEF_SET.contains(stmtContext.getPublicDefinition());
}
private boolean isSupportedAsShorthandCase() {
final Collection> supportedCaseShorthands = getFromNamespace(ValidationBundlesNamespace.class,
ValidationBundleType.SUPPORTED_CASE_SHORTHANDS);
return supportedCaseShorthands == null || supportedCaseShorthands.contains(getPublicDefinition());
}
private SchemaPath createSchemaPath() {
final Optional maybeParentPath = parent.getSchemaPath();
Verify.verify(maybeParentPath.isPresent(), "Parent %s does not have a SchemaPath", parent);
final SchemaPath parentPath = maybeParentPath.get();
if (argument instanceof QName) {
final QName qname = (QName) argument;
if (StmtContextUtils.producesDeclared(this, UsesStatement.class)) {
return maybeParentPath.orNull();
}
final SchemaPath path;
if ((StmtContextUtils.producesDeclared(getParentContext(), ChoiceStatement.class)
|| Boolean.TRUE.equals(parent.getFromNamespace(AugmentToChoiceNamespace.class, parent)))
&& isSupportedAsShorthandCase()) {
path = parentPath.createChild(qname);
} else {
path = parentPath;
}
return path.createChild(qname);
}
if (argument instanceof String) {
// FIXME: This may yield illegal argument exceptions
final StatementContextBase, ?, ?> originalCtx = getOriginalCtx();
final QName qname = (originalCtx != null) ? Utils.qNameFromArgument(originalCtx, (String) argument) : Utils
.qNameFromArgument(this, (String) argument);
return parentPath.createChild(qname);
}
if (argument instanceof SchemaNodeIdentifier
&& (StmtContextUtils.producesDeclared(this, AugmentStatement.class) || StmtContextUtils
.producesDeclared(this, RefineStatement.class) || StmtContextUtils
.producesDeclared(this, DeviationStatement.class))) {
return parentPath.createChild(((SchemaNodeIdentifier) argument).getPathFromRoot());
}
if (Utils.isUnknownNode(this)) {
return parentPath.createChild(getPublicDefinition().getStatementName());
}
// FIXME: this does not look right
return maybeParentPath.orNull();
}
@Nonnull
@Override
public Optional getSchemaPath() {
SchemaPath local = schemaPath;
if (local == null) {
synchronized (this) {
local = schemaPath;
if (local == null) {
local = createSchemaPath();
schemaPath = local;
}
}
}
return Optional.fromNullable(local);
}
@Override
public boolean isRootContext() {
return false;
}
@Override
public boolean isConfiguration() {
if (haveConfiguration) {
return configuration;
}
final StmtContext configStatement = StmtContextUtils.findFirstSubstatement(this,
ConfigStatement.class);
final boolean parentIsConfig = parent.isConfiguration();
final boolean isConfig;
if (configStatement != null) {
isConfig = configStatement.getStatementArgument();
// Validity check: if parent is config=false this cannot be a config=true
InferenceException.throwIf(isConfig && !parentIsConfig, getStatementSourceReference(),
"Parent node has config=false, this node must not be specifed as config=true");
} else {
// If "config" statement is not specified, the default is the same as the parent's "config" value.
isConfig = parentIsConfig;
}
// Resolved, make sure we cache this return
configuration = isConfig;
haveConfiguration = true;
return isConfig;
}
@Override
public boolean isEnabledSemanticVersioning() {
return parent.isEnabledSemanticVersioning();
}
@Override
public YangVersion getRootVersion() {
return getRoot().getRootVersion();
}
@Override
public void setRootVersion(final YangVersion version) {
getRoot().setRootVersion(version);
}
}