opendaylight/config/yang-jmx-generator/src/main/java/org/opendaylight/controller/config/yangjmxgenerator/ModuleMXBeanEntryBuilder.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.config.yangjmxgenerator;
   9
  10 import static com.google.common.base.Preconditions.checkNotNull;
  11 import static com.google.common.base.Preconditions.checkState;
  12 import static java.lang.String.format;
  13 import static org.opendaylight.controller.config.yangjmxgenerator.ConfigConstants.createConfigQName;
  14 import com.google.common.annotations.VisibleForTesting;
  15 import com.google.common.base.Function;
  16 import com.google.common.base.Optional;
  17 import com.google.common.collect.Collections2;
  18 import com.google.common.collect.Maps;
  19 import com.google.common.collect.Sets;
  20 import java.util.Collection;
  21 import java.util.Collections;
  22 import java.util.HashMap;
  23 import java.util.Map;
  24 import java.util.Objects;
  25 import java.util.Set;
  26 import java.util.regex.Matcher;
  27 import java.util.regex.Pattern;
  28 import javax.annotation.Nullable;
  29 import org.opendaylight.controller.config.yangjmxgenerator.attribute.AbstractDependencyAttribute;
  30 import org.opendaylight.controller.config.yangjmxgenerator.attribute.AttributeIfc;
  31 import org.opendaylight.controller.config.yangjmxgenerator.attribute.DependencyAttribute;
  32 import org.opendaylight.controller.config.yangjmxgenerator.attribute.JavaAttribute;
  33 import org.opendaylight.controller.config.yangjmxgenerator.attribute.ListAttribute;
  34 import org.opendaylight.controller.config.yangjmxgenerator.attribute.ListDependenciesAttribute;
  35 import org.opendaylight.controller.config.yangjmxgenerator.attribute.TOAttribute;
  36 import org.opendaylight.controller.config.yangjmxgenerator.plugin.util.NameConflictException;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.rev130405.ServiceRef;
  38 import org.opendaylight.yangtools.yang.common.QName;
  39 import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
  40 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
  41 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  42 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  43 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  44 import org.opendaylight.yangtools.yang.model.api.IdentitySchemaNode;
  45 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
  46 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  47 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  48 import org.opendaylight.yangtools.yang.model.api.Module;
  49 import org.opendaylight.yangtools.yang.model.api.ModuleImport;
  50 import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
  51 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  52 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  53 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  54 import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode;
  55 import org.opendaylight.yangtools.yang.model.api.UsesNode;
  56 import org.slf4j.Logger;
  57 import org.slf4j.LoggerFactory;
  58
  59 final class ModuleMXBeanEntryBuilder {
  60
  61     private Module currentModule;
  62     private Map<QName, ServiceInterfaceEntry> qNamesToSIEs;
  63     private SchemaContext schemaContext;
  64     private TypeProviderWrapper typeProviderWrapper;
  65     private String packageName;
  66
  67     public ModuleMXBeanEntryBuilder setModule(final Module module) {
  68         this.currentModule = module;
  69         return this;
  70     }
  71
  72     public ModuleMXBeanEntryBuilder setqNamesToSIEs(final Map<QName, ServiceInterfaceEntry> qNamesToSIEs) {
  73         this.qNamesToSIEs = qNamesToSIEs;
  74         return this;
  75     }
  76
  77     public ModuleMXBeanEntryBuilder setSchemaContext(final SchemaContext schemaContext) {
  78         this.schemaContext = schemaContext;
  79         return this;
  80     }
  81
  82     public ModuleMXBeanEntryBuilder setTypeProviderWrapper(final TypeProviderWrapper typeProviderWrapper) {
  83         this.typeProviderWrapper = typeProviderWrapper;
  84         return this;
  85     }
  86
  87     public ModuleMXBeanEntryBuilder setPackageName(final String packageName) {
  88         this.packageName = packageName;
  89         return this;
  90     }
  91
  92     private static final Logger LOG = LoggerFactory
  93             .getLogger(ModuleMXBeanEntryBuilder.class);
  94
  95     // TODO: the XPath should be parsed by code generator IMO
  96     private static final String MAGIC_STRING = "MAGIC_STRING";
  97     private static final String MODULE_CONDITION_XPATH_TEMPLATE = "^/MAGIC_STRING:modules/MAGIC_STRING:module/MAGIC_STRING:type\\s*=\\s*['\"](.+)['\"]$";
  98     private static final SchemaPath EXPECTED_CONFIGURATION_AUGMENTATION_SCHEMA_PATH = SchemaPath.create(true,
  99             createConfigQName("modules"), createConfigQName("module"), createConfigQName("configuration"));
 100     private static final SchemaPath EXPECTED_STATE_AUGMENTATION_SCHEMA_PATH = SchemaPath.create(true,
 101             createConfigQName("modules"), createConfigQName("module"), createConfigQName("state"));
 102     private static final Pattern PREFIX_COLON_LOCAL_NAME = Pattern
 103             .compile("^(.+):(.+)$");
 104
 105
 106     public Map<String, ModuleMXBeanEntry> build() {
 107         LOG.debug("Generating ModuleMXBeans of {} to package {}",
 108                 currentModule.getNamespace(), packageName);
 109
 110         String configModulePrefix;
 111         try {
 112             configModulePrefix = getConfigModulePrefixFromImport(currentModule);
 113         } catch (IllegalArgumentException e) {
 114             // this currentModule does not import config currentModule
 115             return Collections.emptyMap();
 116         }
 117
 118         // get identities of base config:currentModule-type
 119         Map<String, IdentitySchemaNode> moduleIdentities =  getIdentityMap();
 120
 121         Map<String, QName> uniqueGeneratedClassesNames = new HashMap<>();
 122
 123         // each currentModule name should have an augmentation defined
 124         Map<String, IdentitySchemaNode> unaugmentedModuleIdentities = new HashMap<>(
 125                 moduleIdentities);
 126
 127         Map<String, ModuleMXBeanEntry> result = new HashMap<>();
 128
 129         for (AugmentationSchema augmentation : currentModule.getAugmentations()) {
 130             Collection<DataSchemaNode> childNodes = augmentation.getChildNodes();
 131             if (areAllChildrenChoiceCaseNodes(childNodes)) {
 132                 for (ChoiceCaseNode childCase : castChildNodesToChoiceCases(childNodes)) {
 133                     // TODO refactor, extract to standalone builder class
 134                     processChoiceCaseNode(result, uniqueGeneratedClassesNames, configModulePrefix, moduleIdentities,
 135                             unaugmentedModuleIdentities, augmentation, childCase);
 136                 }
 137             } // skip if child nodes are not all cases
 138         }
 139         // clean up nulls
 140         cleanUpNulls(result);
 141         // check attributes name uniqueness
 142         checkAttributeNamesUniqueness(uniqueGeneratedClassesNames, result);
 143         checkUnaugumentedIdentities(unaugmentedModuleIdentities);
 144
 145         LOG.debug("Number of ModuleMXBeans to be generated: {}", result.size());
 146
 147         return result;
 148     }
 149
 150     private static void cleanUpNulls(final Map<String, ModuleMXBeanEntry> result) {
 151         for (Map.Entry<String, ModuleMXBeanEntry> entry : result.entrySet()) {
 152             ModuleMXBeanEntry module = entry.getValue();
 153             if (module.getAttributes() == null) {
 154                 module.setYangToAttributes(Collections
 155                         .<String, AttributeIfc> emptyMap());
 156             } else if (module.getRuntimeBeans() == null) {
 157                 module.setRuntimeBeans(Collections
 158                         .<RuntimeBeanEntry> emptyList());
 159             }
 160         }
 161     }
 162
 163     private static void checkUnaugumentedIdentities(final Map<String, IdentitySchemaNode> unaugmentedModuleIdentities) {
 164         if (unaugmentedModuleIdentities.size() > 0) {
 165             LOG.warn("Augmentation not found for all currentModule identities: {}",
 166                     unaugmentedModuleIdentities.keySet());
 167         }
 168     }
 169
 170     private static void checkAttributeNamesUniqueness(final Map<String, QName> uniqueGeneratedClassesNames, final Map<String, ModuleMXBeanEntry> result) {
 171         for (Map.Entry<String, ModuleMXBeanEntry> entry : result.entrySet()) {
 172             checkUniqueRuntimeBeanAttributesName(entry.getValue(),
 173                     uniqueGeneratedClassesNames);
 174         }
 175     }
 176
 177     private Map<String, IdentitySchemaNode> getIdentityMap() {
 178         Map<String, IdentitySchemaNode> moduleIdentities = Maps.newHashMap();
 179
 180         for (IdentitySchemaNode id : currentModule.getIdentities()) {
 181             if (id.getBaseIdentity() != null
 182                     && ConfigConstants.MODULE_TYPE_Q_NAME.equals(id.getBaseIdentity().getQName())) {
 183                 String identityLocalName = id.getQName().getLocalName();
 184                 if (moduleIdentities.containsKey(identityLocalName)) {
 185                     throw new IllegalStateException("Module name already defined in this currentModule: "
 186                             + identityLocalName);
 187                 } else {
 188                     moduleIdentities.put(identityLocalName, id);
 189                     LOG.debug("Found identity {}", identityLocalName);
 190                 }
 191                 // validation check on unknown schema nodes
 192                 boolean providedServiceWasSet = false;
 193                 for (UnknownSchemaNode unknownNode : id.getUnknownSchemaNodes()) {
 194                     // TODO: test this
 195                     boolean unknownNodeIsProvidedServiceExtension = ConfigConstants.PROVIDED_SERVICE_EXTENSION_QNAME.equals(unknownNode.getNodeType());
 196                     // true => no op: 0 or more provided identities are allowed
 197
 198                     if (ConfigConstants.JAVA_NAME_PREFIX_EXTENSION_QNAME.equals(unknownNode.getNodeType())) {
 199                         // 0..1 allowed
 200                         checkState(
 201                                 providedServiceWasSet == false,
 202                                 format("More than one language extension %s is not allowed here: %s",
 203                                         ConfigConstants.JAVA_NAME_PREFIX_EXTENSION_QNAME, id));
 204                         providedServiceWasSet = true;
 205                     } else if (unknownNodeIsProvidedServiceExtension == false) {
 206                         throw new IllegalStateException("Unexpected language extension " + unknownNode.getNodeType());
 207                     }
 208                 }
 209             }
 210         }
 211
 212         return moduleIdentities;
 213     }
 214
 215     private Collection<ChoiceCaseNode> castChildNodesToChoiceCases(final Collection<DataSchemaNode> childNodes) {
 216         return Collections2.transform(childNodes, new Function<DataSchemaNode, ChoiceCaseNode>() {
 217             @Nullable
 218             @Override
 219             public ChoiceCaseNode apply(@Nullable final DataSchemaNode input) {
 220                 return (ChoiceCaseNode) input;
 221             }
 222         });
 223     }
 224
 225     private boolean areAllChildrenChoiceCaseNodes(final Iterable<DataSchemaNode> childNodes) {
 226         for (DataSchemaNode childNode : childNodes) {
 227             if (childNode instanceof ChoiceCaseNode == false) {
 228                 return false;
 229             }
 230         }
 231         return true;
 232     }
 233
 234     private <HAS_CHILDREN_AND_QNAME extends DataNodeContainer & SchemaNode> void processChoiceCaseNode(final Map<String, ModuleMXBeanEntry> result,
 235             final Map<String, QName> uniqueGeneratedClassesNames, final String configModulePrefix,
 236             final Map<String, IdentitySchemaNode> moduleIdentities,
 237             final Map<String, IdentitySchemaNode> unaugmentedModuleIdentities, final AugmentationSchema augmentation,
 238             final DataSchemaNode when) {
 239
 240         ChoiceCaseNode choiceCaseNode = (ChoiceCaseNode) when;
 241         if (choiceCaseNode.getConstraints() == null || choiceCaseNode.getConstraints().getWhenCondition() == null) {
 242             return;
 243         }
 244         RevisionAwareXPath xPath = choiceCaseNode.getConstraints().getWhenCondition();
 245         Matcher matcher = getWhenConditionMatcher(configModulePrefix, xPath);
 246         if (matcher.matches() == false) {
 247             return;
 248         }
 249         String moduleLocalNameFromXPath = matcher.group(1);
 250         IdentitySchemaNode moduleIdentity = moduleIdentities.get(moduleLocalNameFromXPath);
 251         unaugmentedModuleIdentities.remove(moduleLocalNameFromXPath);
 252         checkState(moduleIdentity != null, "Cannot find identity " + moduleLocalNameFromXPath
 253                 + " matching augmentation " + augmentation);
 254         Map<String, QName> providedServices = findProvidedServices(moduleIdentity, currentModule, qNamesToSIEs,
 255                 schemaContext);
 256
 257         if (moduleIdentity == null) {
 258             throw new IllegalStateException("Cannot find identity specified by augmentation xpath constraint: "
 259                     + moduleLocalNameFromXPath + " of " + augmentation);
 260         }
 261         String javaNamePrefix = TypeProviderWrapper.findJavaNamePrefix(moduleIdentity);
 262
 263         Map<String, AttributeIfc> yangToAttributes = null;
 264         // runtime-data
 265         Collection<RuntimeBeanEntry> runtimeBeans = null;
 266
 267         HAS_CHILDREN_AND_QNAME dataNodeContainer = getDataNodeContainer(choiceCaseNode);
 268
 269         if (EXPECTED_CONFIGURATION_AUGMENTATION_SCHEMA_PATH.equals(augmentation.getTargetPath())) {
 270             LOG.debug("Parsing configuration of {}", moduleLocalNameFromXPath);
 271             yangToAttributes = fillConfiguration(dataNodeContainer, currentModule, typeProviderWrapper, qNamesToSIEs,
 272                     schemaContext, packageName);
 273             checkUniqueAttributesWithGeneratedClass(uniqueGeneratedClassesNames, when.getQName(), yangToAttributes);
 274         } else if (EXPECTED_STATE_AUGMENTATION_SCHEMA_PATH.equals(augmentation.getTargetPath())) {
 275             LOG.debug("Parsing state of {}", moduleLocalNameFromXPath);
 276             try {
 277                 runtimeBeans = fillRuntimeBeans(dataNodeContainer, currentModule, typeProviderWrapper, packageName,
 278                         moduleLocalNameFromXPath, javaNamePrefix);
 279             } catch (NameConflictException e) {
 280                 throw new NameConflictException(e.getConflictingName(), when.getQName(), when.getQName());
 281             }
 282             checkUniqueRuntimeBeansGeneratedClasses(uniqueGeneratedClassesNames, when, runtimeBeans);
 283             Set<RuntimeBeanEntry> runtimeBeanEntryValues = Sets.newHashSet(runtimeBeans);
 284             for (RuntimeBeanEntry entry : runtimeBeanEntryValues) {
 285                 checkUniqueAttributesWithGeneratedClass(uniqueGeneratedClassesNames, when.getQName(),
 286                         entry.getYangPropertiesToTypesMap());
 287             }
 288
 289         } else {
 290             throw new IllegalArgumentException("Cannot parse augmentation " + augmentation);
 291         }
 292         boolean hasDummyContainer = choiceCaseNode.equals(dataNodeContainer) == false;
 293
 294         String nullableDummyContainerName = hasDummyContainer ? dataNodeContainer.getQName().getLocalName() : null;
 295         if (result.containsKey(moduleLocalNameFromXPath)) {
 296             // either fill runtimeBeans or yangToAttributes, merge
 297             ModuleMXBeanEntry moduleMXBeanEntry = result.get(moduleLocalNameFromXPath);
 298             if (yangToAttributes != null && moduleMXBeanEntry.getAttributes() == null) {
 299                 moduleMXBeanEntry.setYangToAttributes(yangToAttributes);
 300             } else if (runtimeBeans != null && moduleMXBeanEntry.getRuntimeBeans() == null) {
 301                 moduleMXBeanEntry.setRuntimeBeans(runtimeBeans);
 302             }
 303             checkState(Objects.equals(nullableDummyContainerName, moduleMXBeanEntry.getNullableDummyContainerName()),
 304                     "Mismatch in module " + moduleMXBeanEntry.toString() + " - dummy container must be present/missing in" +
 305                     " both state and configuration");
 306         } else {
 307             ModuleMXBeanEntry.ModuleMXBeanEntryInitial initial = new ModuleMXBeanEntry.ModuleMXBeanEntryInitialBuilder()
 308                 .setIdSchemaNode(moduleIdentity).setPackageName(packageName).setJavaNamePrefix(javaNamePrefix)
 309                 .setNamespace(currentModule.getNamespace().toString()).setqName(ModuleUtil.getQName(currentModule))
 310                 .build();
 311
 312             // construct ModuleMXBeanEntry
 313             ModuleMXBeanEntry moduleMXBeanEntry = new ModuleMXBeanEntry(initial, yangToAttributes, providedServices,
 314                     runtimeBeans);
 315
 316             moduleMXBeanEntry.setYangModuleName(currentModule.getName());
 317             moduleMXBeanEntry.setYangModuleLocalname(moduleLocalNameFromXPath);
 318             moduleMXBeanEntry.setNullableDummyContainerName(nullableDummyContainerName);
 319             result.put(moduleLocalNameFromXPath, moduleMXBeanEntry);
 320         }
 321     }
 322
 323     private void checkUniqueRuntimeBeansGeneratedClasses(final Map<String, QName> uniqueGeneratedClassesNames,
 324             final DataSchemaNode when, final Collection<RuntimeBeanEntry> runtimeBeans) {
 325         for (RuntimeBeanEntry runtimeBean : runtimeBeans) {
 326             final String javaNameOfRuntimeMXBean = runtimeBean.getJavaNameOfRuntimeMXBean();
 327             if (uniqueGeneratedClassesNames.containsKey(javaNameOfRuntimeMXBean)) {
 328                 QName firstDefinedQName = uniqueGeneratedClassesNames.get(javaNameOfRuntimeMXBean);
 329                 throw new NameConflictException(javaNameOfRuntimeMXBean, firstDefinedQName, when.getQName());
 330             }
 331             uniqueGeneratedClassesNames.put(javaNameOfRuntimeMXBean, when.getQName());
 332         }
 333     }
 334
 335     private static void checkUniqueRuntimeBeanAttributesName(final ModuleMXBeanEntry mxBeanEntry,
 336             final Map<String, QName> uniqueGeneratedClassesNames) {
 337         for (RuntimeBeanEntry runtimeBeanEntry : mxBeanEntry.getRuntimeBeans()) {
 338             for (String runtimeAttName : runtimeBeanEntry.getYangPropertiesToTypesMap().keySet()) {
 339                 if (mxBeanEntry.getAttributes().keySet().contains(runtimeAttName)) {
 340                     QName qName1 = uniqueGeneratedClassesNames.get(runtimeBeanEntry.getJavaNameOfRuntimeMXBean());
 341                     QName qName2 = uniqueGeneratedClassesNames.get(mxBeanEntry.getGloballyUniqueName());
 342                     throw new NameConflictException(runtimeAttName, qName1, qName2);
 343                 }
 344             }
 345         }
 346     }
 347
 348     private static void checkUniqueAttributesWithGeneratedClass(final Map<String, QName> uniqueGeneratedClassNames,
 349             final QName parentQName, final Map<String, AttributeIfc> yangToAttributes) {
 350         for (Map.Entry<String, AttributeIfc> attr : yangToAttributes.entrySet()) {
 351             if (attr.getValue() instanceof TOAttribute) {
 352                 checkUniqueTOAttr(uniqueGeneratedClassNames, parentQName, (TOAttribute) attr.getValue());
 353             } else if (attr.getValue() instanceof ListAttribute
 354                     && ((ListAttribute) attr.getValue()).getInnerAttribute() instanceof TOAttribute) {
 355                 checkUniqueTOAttr(uniqueGeneratedClassNames, parentQName,
 356                         (TOAttribute) ((ListAttribute) attr.getValue()).getInnerAttribute());
 357             }
 358         }
 359     }
 360
 361     private static void checkUniqueTOAttr(final Map<String, QName> uniqueGeneratedClassNames, final QName parentQName, final TOAttribute attr) {
 362         final String upperCaseCamelCase = attr.getUpperCaseCammelCase();
 363         if (uniqueGeneratedClassNames.containsKey(upperCaseCamelCase)) {
 364             QName firstDefinedQName = uniqueGeneratedClassNames.get(upperCaseCamelCase);
 365             throw new NameConflictException(upperCaseCamelCase, firstDefinedQName, parentQName);
 366         } else {
 367             uniqueGeneratedClassNames.put(upperCaseCamelCase, parentQName);
 368         }
 369     }
 370
 371     private Collection<RuntimeBeanEntry> fillRuntimeBeans(final DataNodeContainer dataNodeContainer, final Module currentModule,
 372             final TypeProviderWrapper typeProviderWrapper, final String packageName, final String moduleLocalNameFromXPath,
 373             final String javaNamePrefix) {
 374
 375         return RuntimeBeanEntry.extractClassNameToRuntimeBeanMap(packageName, dataNodeContainer, moduleLocalNameFromXPath,
 376                 typeProviderWrapper, javaNamePrefix, currentModule, schemaContext).values();
 377
 378     }
 379
 380     /**
 381      * Since each case statement within a module must provide unique child nodes, it is allowed to wrap
 382      * the actual configuration with a container node with name equal to case name.
 383      *
 384      * @param choiceCaseNode state or configuration case statement
 385      * @return either choiceCaseNode or its only child container
 386      */
 387     private <HAS_CHILDREN_AND_QNAME extends DataNodeContainer & SchemaNode> HAS_CHILDREN_AND_QNAME getDataNodeContainer(final ChoiceCaseNode choiceCaseNode) {
 388         Collection<DataSchemaNode> childNodes = choiceCaseNode.getChildNodes();
 389         if (childNodes.size() == 1) {
 390             DataSchemaNode onlyChild = childNodes.iterator().next();
 391             if (onlyChild instanceof ContainerSchemaNode) {
 392                 ContainerSchemaNode onlyContainer = (ContainerSchemaNode) onlyChild;
 393                 if (Objects.equals(onlyContainer.getQName().getLocalName(), choiceCaseNode.getQName().getLocalName())) {
 394                     // the actual configuration is inside dummy container
 395                     return (HAS_CHILDREN_AND_QNAME) onlyContainer;
 396                 }
 397             }
 398         }
 399         return (HAS_CHILDREN_AND_QNAME) choiceCaseNode;
 400     }
 401
 402     private Map<String, AttributeIfc> fillConfiguration(final DataNodeContainer dataNodeContainer, final Module currentModule,
 403             final TypeProviderWrapper typeProviderWrapper, final Map<QName, ServiceInterfaceEntry> qNamesToSIEs,
 404             final SchemaContext schemaContext, final String packageName) {
 405         Map<String, AttributeIfc> yangToAttributes = new HashMap<>();
 406         for (DataSchemaNode attrNode : dataNodeContainer.getChildNodes()) {
 407             AttributeIfc attributeValue = getAttributeValue(attrNode, currentModule, qNamesToSIEs, typeProviderWrapper,
 408                     schemaContext, packageName);
 409             yangToAttributes.put(attributeValue.getAttributeYangName(), attributeValue);
 410         }
 411         return yangToAttributes;
 412     }
 413
 414     private Map<String, QName> findProvidedServices(final IdentitySchemaNode moduleIdentity, final Module currentModule,
 415             final Map<QName, ServiceInterfaceEntry> qNamesToSIEs, final SchemaContext schemaContext) {
 416         Map<String, QName> result = new HashMap<>();
 417         for (UnknownSchemaNode unknownNode : moduleIdentity.getUnknownSchemaNodes()) {
 418             if (ConfigConstants.PROVIDED_SERVICE_EXTENSION_QNAME.equals(unknownNode.getNodeType())) {
 419                 String prefixAndIdentityLocalName = unknownNode.getNodeParameter();
 420                 ServiceInterfaceEntry sie = findSIE(prefixAndIdentityLocalName, currentModule, qNamesToSIEs,
 421                         schemaContext);
 422                 result.put(sie.getFullyQualifiedName(), sie.getQName());
 423             }
 424         }
 425         return result;
 426     }
 427
 428     private AttributeIfc getAttributeValue(final DataSchemaNode attrNode, final Module currentModule,
 429             final Map<QName, ServiceInterfaceEntry> qNamesToSIEs, final TypeProviderWrapper typeProviderWrapper,
 430             final SchemaContext schemaContext, final String packageName) {
 431
 432         if (attrNode instanceof LeafSchemaNode) {
 433             // simple type
 434             LeafSchemaNode leaf = (LeafSchemaNode) attrNode;
 435             return new JavaAttribute(leaf, typeProviderWrapper);
 436         } else if (attrNode instanceof ContainerSchemaNode) {
 437             // reference or TO
 438             ContainerSchemaNode containerSchemaNode = (ContainerSchemaNode) attrNode;
 439             Optional<? extends AbstractDependencyAttribute> dependencyAttributeOptional = extractDependency(
 440                     containerSchemaNode, attrNode, currentModule, qNamesToSIEs, schemaContext);
 441             if (dependencyAttributeOptional.isPresent()) {
 442                 return dependencyAttributeOptional.get();
 443             } else {
 444                 return TOAttribute.create(containerSchemaNode, typeProviderWrapper, packageName);
 445             }
 446
 447         } else if (attrNode instanceof LeafListSchemaNode) {
 448             return ListAttribute.create((LeafListSchemaNode) attrNode, typeProviderWrapper);
 449         } else if (attrNode instanceof ListSchemaNode) {
 450             ListSchemaNode listSchemaNode = (ListSchemaNode) attrNode;
 451             Optional<? extends AbstractDependencyAttribute> dependencyAttributeOptional = extractDependency(
 452                     listSchemaNode, attrNode, currentModule, qNamesToSIEs, schemaContext);
 453             if (dependencyAttributeOptional.isPresent()) {
 454                 return dependencyAttributeOptional.get();
 455             } else {
 456                 return ListAttribute.create(listSchemaNode, typeProviderWrapper, packageName);
 457             }
 458         } else {
 459             throw new UnsupportedOperationException("Unknown configuration node " + attrNode.toString());
 460         }
 461     }
 462
 463     private Optional<? extends AbstractDependencyAttribute> extractDependency(final DataNodeContainer dataNodeContainer,
 464             final DataSchemaNode attrNode, final Module currentModule, final Map<QName, ServiceInterfaceEntry> qNamesToSIEs,
 465             final SchemaContext schemaContext) {
 466         if (isDependencyContainer(dataNodeContainer)) {
 467             // reference
 468             UsesNode usesNode = dataNodeContainer.getUses().iterator().next();
 469             checkState(usesNode.getRefines().size() == 1, "Unexpected 'refine' child node size of " + dataNodeContainer);
 470             LeafSchemaNode refine = (LeafSchemaNode) usesNode.getRefines().values().iterator().next();
 471             checkState(refine.getUnknownSchemaNodes().size() == 1, "Unexpected unknown schema node size of " + refine);
 472             UnknownSchemaNode requiredIdentity = refine.getUnknownSchemaNodes().iterator().next();
 473             checkState(ConfigConstants.REQUIRED_IDENTITY_EXTENSION_QNAME.equals(requiredIdentity.getNodeType()),
 474                     "Unexpected language extension " + requiredIdentity);
 475             String prefixAndIdentityLocalName = requiredIdentity.getNodeParameter();
 476             // import should point to a module
 477             ServiceInterfaceEntry serviceInterfaceEntry = findSIE(prefixAndIdentityLocalName, currentModule,
 478                     qNamesToSIEs, schemaContext);
 479             boolean mandatory = refine.getConstraints().isMandatory();
 480             AbstractDependencyAttribute reference;
 481             if (dataNodeContainer instanceof ContainerSchemaNode) {
 482                 reference = new DependencyAttribute(attrNode, serviceInterfaceEntry, mandatory,
 483                         attrNode.getDescription());
 484             } else {
 485                 reference = new ListDependenciesAttribute(attrNode, serviceInterfaceEntry, mandatory,
 486                         attrNode.getDescription());
 487             }
 488             return Optional.of(reference);
 489         }
 490         return Optional.absent();
 491     }
 492
 493     private boolean isDependencyContainer(final DataNodeContainer dataNodeContainer) {
 494         if(dataNodeContainer.getUses().size() != 1) {
 495             return false;
 496         }
 497         UsesNode onlyUses = dataNodeContainer.getUses().iterator().next();
 498         if(onlyUses.getGroupingPath().getLastComponent().equals(ServiceRef.QNAME) == false) {
 499             return false;
 500         }
 501
 502         return getChildNodeSizeWithoutUses(dataNodeContainer) == 0;
 503     }
 504
 505     private int getChildNodeSizeWithoutUses(final DataNodeContainer csn) {
 506         int result = 0;
 507         for (DataSchemaNode dsn : csn.getChildNodes()) {
 508             if (dsn.isAddedByUses() == false) {
 509                 result++;
 510             }
 511         }
 512         return result;
 513     }
 514
 515     private ServiceInterfaceEntry findSIE(final String prefixAndIdentityLocalName, final Module currentModule,
 516             final Map<QName, ServiceInterfaceEntry> qNamesToSIEs, final SchemaContext schemaContext) {
 517
 518         Matcher m = PREFIX_COLON_LOCAL_NAME.matcher(prefixAndIdentityLocalName);
 519         Module foundModule;
 520         String localSIName;
 521         if (m.matches()) {
 522             // if there is a prefix, look for ModuleImport with this prefix. Get
 523             // Module from SchemaContext
 524             String prefix = m.group(1);
 525             ModuleImport moduleImport = findModuleImport(currentModule, prefix);
 526             foundModule = schemaContext.findModuleByName(moduleImport.getModuleName(), moduleImport.getRevision());
 527             checkNotNull(foundModule, format("Module not found in SchemaContext by %s", moduleImport));
 528             localSIName = m.group(2);
 529         } else {
 530             foundModule = currentModule; // no prefix => SIE is in currentModule
 531             localSIName = prefixAndIdentityLocalName;
 532         }
 533         QName siQName = QName.create(foundModule.getNamespace(), foundModule.getRevision(), localSIName);
 534         ServiceInterfaceEntry sie = qNamesToSIEs.get(siQName);
 535         checkState(sie != null, "Cannot find referenced Service Interface by " + prefixAndIdentityLocalName);
 536         return sie;
 537     }
 538
 539     private ModuleImport findModuleImport(final Module module, final String prefix) {
 540         for (ModuleImport moduleImport : module.getImports()) {
 541             if (moduleImport.getPrefix().equals(prefix)) {
 542                 return moduleImport;
 543             }
 544         }
 545         throw new IllegalStateException(format("Import not found with prefix %s in %s", prefix, module));
 546     }
 547
 548     @VisibleForTesting
 549     static Matcher getWhenConditionMatcher(final String prefix, final RevisionAwareXPath whenConstraint) {
 550         String xpathRegex = MODULE_CONDITION_XPATH_TEMPLATE.replace(MAGIC_STRING, prefix);
 551         Pattern pattern = Pattern.compile(xpathRegex);
 552         return pattern.matcher(whenConstraint.toString());
 553     }
 554
 555     String getConfigModulePrefixFromImport(final Module currentModule) {
 556         for (ModuleImport currentImport : currentModule.getImports()) {
 557             if (currentImport.getModuleName().equals(ConfigConstants.CONFIG_MODULE)) {
 558                 return currentImport.getPrefix();
 559             }
 560         }
 561         throw new IllegalArgumentException("Cannot find import " + ConfigConstants.CONFIG_MODULE + " in "
 562                 + currentModule);
 563     }
 564
 565 }