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package com.sun.xml.ws.policy.sourcemodel;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import com.sun.xml.ws.policy.AssertionSet;
import com.sun.xml.ws.policy.Policy;
import com.sun.xml.ws.policy.PolicyAssertion;
import com.sun.xml.ws.policy.PolicyException;
import com.sun.xml.ws.policy.privateutil.LocalizationMessages;
import com.sun.xml.ws.policy.privateutil.PolicyLogger;
import com.sun.xml.ws.policy.privateutil.PolicyUtils;
import com.sun.xml.ws.policy.spi.AssertionCreationException;
import com.sun.xml.ws.policy.spi.PolicyAssertionCreator;
/**
* This class provides method for translating {@link PolicySourceModel} structure into normalized {@link Policy} expression.
* The resulting Policy is disconnected from its model, thus any additional changes in model will have no effect on the Policy
* expression.
*
* @author Marek Potociar
*/
public final class PolicyModelTranslator {
private static final class ContentDecomposition {
final List<Collection<ModelNode>> exactlyOneContents = new LinkedList<Collection<ModelNode>>();
final List<ModelNode> assertions = new LinkedList<ModelNode>();
void reset() {
exactlyOneContents.clear();
assertions.clear();
}
}
private static final class RawAssertion {
ModelNode originalNode; // used to initialize nestedPolicy and nestedAssertions in the constructor of RawAlternative
Collection<RawAlternative> nestedAlternatives = null;
final Collection<ModelNode> parameters;
RawAssertion(ModelNode originalNode, Collection<ModelNode> parameters) {
this.parameters = parameters;
this.originalNode = originalNode;
}
}
private static final class RawAlternative {
private static final PolicyLogger LOGGER = PolicyLogger.getLogger(PolicyModelTranslator.RawAlternative.class);
final List<RawPolicy> allNestedPolicies = new LinkedList<RawPolicy>(); // used to track the nested policies which need to be normalized
final Collection<RawAssertion> nestedAssertions;
RawAlternative(Collection<ModelNode> assertionNodes) throws PolicyException {
this.nestedAssertions = new LinkedList<RawAssertion>();
for (ModelNode node : assertionNodes) {
RawAssertion assertion = new RawAssertion(node, new LinkedList<ModelNode>());
nestedAssertions.add(assertion);
for (ModelNode assertionNodeChild : assertion.originalNode.getContent()) {
switch (assertionNodeChild.getType()) {
case ASSERTION_PARAMETER_NODE:
assertion.parameters.add(assertionNodeChild);
break;
case POLICY:
case POLICY_REFERENCE:
if (assertion.nestedAlternatives == null) {
assertion.nestedAlternatives = new LinkedList<RawAlternative>();
RawPolicy nestedPolicy;
if (assertionNodeChild.getType() == ModelNode.Type.POLICY) {
nestedPolicy = new RawPolicy(assertionNodeChild, assertion.nestedAlternatives);
} else {
nestedPolicy = new RawPolicy(getReferencedModelRootNode(assertionNodeChild), assertion.nestedAlternatives);
}
this.allNestedPolicies.add(nestedPolicy);
} else {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0006_UNEXPECTED_MULTIPLE_POLICY_NODES()));
}
break;
default:
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0008_UNEXPECTED_CHILD_MODEL_TYPE(assertionNodeChild.getType())));
}
}
}
}
}
private static final class RawPolicy {
final Collection<ModelNode> originalContent;
final Collection<RawAlternative> alternatives;
RawPolicy(ModelNode policyNode, Collection<RawAlternative> alternatives) {
originalContent = policyNode.getContent();
this.alternatives = alternatives;
}
}
private static final PolicyLogger LOGGER = PolicyLogger.getLogger(PolicyModelTranslator.class);
private static final PolicyModelTranslator translator = new PolicyModelTranslator();
private static final PolicyAssertionCreator defaultCreator = new DefaultPolicyAssertionCreator();
private static final Map<String, PolicyAssertionCreator> assertionCreators;
private static final PolicyException initialException;
static {
Map<String, PolicyAssertionCreator> tempMap = null;
PolicyException tempException = null;
try {
tempMap = initPolicyAssertionCreatorsMap();
} catch (PolicyException ex) {
tempException = ex;
} finally {
assertionCreators = tempMap;
initialException = tempException;
}
}
/**
* Initializes the map of domain-specific policy policy assertion creators
*/
private static Map<String, PolicyAssertionCreator> initPolicyAssertionCreatorsMap() throws PolicyException {
LOGGER.entering();
Map<String, PolicyAssertionCreator> pacMap = new HashMap<String, PolicyAssertionCreator>();
final PolicyAssertionCreator[] creators = PolicyUtils.ServiceProvider.load(PolicyAssertionCreator.class);
for (PolicyAssertionCreator creator : creators) {
final String[] supportedURIs = creator.getSupportedDomainNamespaceURIs();
final String creatorClassName = creator.getClass().getName();
if (supportedURIs == null || supportedURIs.length == 0) {
LOGGER.warning(LocalizationMessages.WSP_0077_ASSERTION_CREATOR_DOES_NOT_SUPPORT_ANY_URI(creatorClassName));
continue;
}
for (String supportedURI : supportedURIs) {
LOGGER.config(LocalizationMessages.WSP_0078_ASSERTION_CREATOR_DISCOVERED(creatorClassName, supportedURI));
if (supportedURI == null || supportedURI.length() == 0) {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0070_ERROR_REGISTERING_ASSERTION_CREATOR(creatorClassName)));
}
final PolicyAssertionCreator oldCreator = pacMap.put(supportedURI, creator);
if (oldCreator != null) {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0071_ERROR_MULTIPLE_ASSERTION_CREATORS_FOR_NAMESPACE(supportedURI, oldCreator.getClass().getName(), creator.getClass().getName())));
}
}
}
pacMap = Collections.unmodifiableMap(pacMap);
LOGGER.exiting(pacMap);
return pacMap;
}
/**
* Method returns thread-safe policy model translator instance.
*
* @return a policy model translator instance.
*/
public static PolicyModelTranslator getTranslator() throws PolicyException {
if (initialException != null) {
throw LOGGER.logSevereException(initialException);
}
return translator;
}
/**
* The method translates {@link PolicySourceModel} structure into normalized {@link Policy} expression. The resulting Policy
* is disconnected from its model, thus any additional changes in model will have no effect on the Policy expression.
*
* @param model the model to be translated into normalized policy expression. Must not be {@code null}.
* @return translated policy expression in it's normalized form.
* @throws PolicyException in case of translation failure
*/
public Policy translate(final PolicySourceModel model) throws PolicyException {
LOGGER.entering(model);
if (model == null) {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0043_POLICY_MODEL_TRANSLATION_ERROR_INPUT_PARAM_NULL()));
}
PolicySourceModel localPolicyModelCopy;
try {
localPolicyModelCopy = model.clone();
} catch (CloneNotSupportedException e) {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0016_UNABLE_TO_CLONE_POLICY_SOURCE_MODEL(), e));
}
final String policyId = localPolicyModelCopy.getPolicyId();
final String policyName = localPolicyModelCopy.getPolicyName();
final Collection<AssertionSet> alternatives = createPolicyAlternatives(localPolicyModelCopy);
LOGGER.finest(LocalizationMessages.WSP_0052_NUMBER_OF_ALTERNATIVE_COMBINATIONS_CREATED(alternatives.size()));
Policy policy = null;
if (alternatives.size() == 0) {
policy = Policy.createNullPolicy(policyName, policyId);
LOGGER.finest(LocalizationMessages.WSP_0055_NO_ALTERNATIVE_COMBINATIONS_CREATED());
} else if (alternatives.size() == 1 && alternatives.iterator().next().isEmpty()) {
policy = Policy.createEmptyPolicy(policyName, policyId);
LOGGER.finest(LocalizationMessages.WSP_0026_SINGLE_EMPTY_ALTERNATIVE_COMBINATION_CREATED());
} else {
policy = Policy.createPolicy(policyName, policyId, alternatives);
LOGGER.finest(LocalizationMessages.WSP_0057_N_ALTERNATIVE_COMBINATIONS_M_POLICY_ALTERNATIVES_CREATED(alternatives.size(), policy.getNumberOfAssertionSets()));
}
LOGGER.exiting(policy);
return policy;
}
/**
* Method creates policy alternatives according to provided model. The model structure is modified in the process.
*
* @return created policy alternatives resulting from policy source model.
*/
private Collection<AssertionSet> createPolicyAlternatives(final PolicySourceModel model) throws PolicyException {
// creating global method variables
final ContentDecomposition decomposition = new ContentDecomposition();
// creating processing queue and starting the processing iterations
final Queue<RawPolicy> policyQueue = new LinkedList<RawPolicy>();
final Queue<Collection<ModelNode>> contentQueue = new LinkedList<Collection<ModelNode>>();
final RawPolicy rootPolicy = new RawPolicy(model.getRootNode(), new LinkedList<RawAlternative>());
RawPolicy processedPolicy = rootPolicy;
do {
Collection<ModelNode> processedContent = processedPolicy.originalContent;
do {
decompose(processedContent, decomposition);
if (decomposition.exactlyOneContents.isEmpty()) {
final RawAlternative alternative = new RawAlternative(decomposition.assertions);
processedPolicy.alternatives.add(alternative);
if (!alternative.allNestedPolicies.isEmpty()) {
policyQueue.addAll(alternative.allNestedPolicies);
}
} else { // we have a non-empty collection of exactly ones
final Collection<Collection<ModelNode>> combinations = PolicyUtils.Collections.combine(decomposition.assertions, decomposition.exactlyOneContents, false);
if (combinations != null && !combinations.isEmpty()) {
// processed alternative was split into some new alternatives, which we need to process
contentQueue.addAll(combinations);
}
}
} while ((processedContent = contentQueue.poll()) != null);
} while ((processedPolicy = policyQueue.poll()) != null);
// normalize nested policies to contain single alternative only
final Collection<AssertionSet> assertionSets = new LinkedList<AssertionSet>();
for (RawAlternative rootAlternative : rootPolicy.alternatives) {
final Collection<AssertionSet> normalizedAlternatives = normalizeRawAlternative(rootAlternative);
assertionSets.addAll(normalizedAlternatives);
}
return assertionSets;
}
/**
* Decomposes the unprocessed alternative content into two different collections:
* <p/>
* Content of 'EXACTLY_ONE' child nodes is expanded and placed in one list and
* 'ASSERTION' nodes are placed into other list. Direct 'ALL' and 'POLICY' child nodes are 'dissolved' in the process.
*
* Method reuses precreated ContentDecomposition object, which is reset before reuse.
*/
private void decompose(final Collection<ModelNode> content, final ContentDecomposition decomposition) throws PolicyException {
decomposition.reset();
final Queue<ModelNode> allContentQueue = new LinkedList<ModelNode>(content);
ModelNode node;
while ((node = allContentQueue.poll()) != null) {
// dissolving direct 'POLICY', 'POLICY_REFERENCE' and 'ALL' child nodes
switch (node.getType()) {
case POLICY :
case ALL :
allContentQueue.addAll(node.getContent());
break;
case POLICY_REFERENCE :
allContentQueue.addAll(getReferencedModelRootNode(node).getContent());
break;
case EXACTLY_ONE :
decomposition.exactlyOneContents.add(expandsExactlyOneContent(node.getContent()));
break;
case ASSERTION :
decomposition.assertions.add(node);
break;
default :
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0007_UNEXPECTED_MODEL_NODE_TYPE_FOUND(node.getType())));
}
}
}
private static ModelNode getReferencedModelRootNode(final ModelNode policyReferenceNode) throws PolicyException {
final PolicySourceModel referencedModel = policyReferenceNode.getReferencedModel();
if (referencedModel == null) {
final PolicyReferenceData refData = policyReferenceNode.getPolicyReferenceData();
if (refData == null) {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0041_POLICY_REFERENCE_NODE_FOUND_WITH_NO_POLICY_REFERENCE_IN_IT()));
} else {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0010_UNEXPANDED_POLICY_REFERENCE_NODE_FOUND_REFERENCING(refData.getReferencedModelUri())));
}
} else {
return referencedModel.getRootNode();
}
}
/**
* Expands content of 'EXACTLY_ONE' node. Direct 'EXACTLY_ONE' child nodes are dissolved in the process.
*/
private Collection<ModelNode> expandsExactlyOneContent(final Collection<ModelNode> content) throws PolicyException {
final Collection<ModelNode> result = new LinkedList<ModelNode>();
final Queue<ModelNode> eoContentQueue = new LinkedList<ModelNode>(content);
ModelNode node;
while ((node = eoContentQueue.poll()) != null) {
// dissolving direct 'EXACTLY_ONE' child nodes
switch (node.getType()) {
case POLICY :
case ALL :
case ASSERTION :
result.add(node);
break;
case POLICY_REFERENCE :
result.add(getReferencedModelRootNode(node));
break;
case EXACTLY_ONE :
eoContentQueue.addAll(node.getContent());
break;
default :
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0001_UNSUPPORTED_MODEL_NODE_TYPE(node.getType())));
}
}
return result;
}
private List<AssertionSet> normalizeRawAlternative(final RawAlternative alternative) throws AssertionCreationException, PolicyException {
final List<PolicyAssertion> normalizedContentBase = new LinkedList<PolicyAssertion>();
final Collection<List<PolicyAssertion>> normalizedContentOptions = new LinkedList<List<PolicyAssertion>>();
if (!alternative.nestedAssertions.isEmpty()) {
final Queue<RawAssertion> nestedAssertionsQueue = new LinkedList<RawAssertion>(alternative.nestedAssertions);
RawAssertion rawAssertion;
while((rawAssertion = nestedAssertionsQueue.poll()) != null) {
final List<PolicyAssertion> normalized = normalizeRawAssertion(rawAssertion);
// if there is only a single result, we can add it direclty to the content base collection
// more elements in the result indicate that we will have to create combinations
if (normalized.size() == 1) {
normalizedContentBase.addAll(normalized);
} else {
normalizedContentOptions.add(normalized);
}
}
}
final List<AssertionSet> options = new LinkedList<AssertionSet>();
if (normalizedContentOptions.isEmpty()) {
// we do not have any options to combine => returning this assertion
options.add(AssertionSet.createAssertionSet(normalizedContentBase));
} else {
// we have some options to combine => creating assertion options based on content combinations
final Collection<Collection<PolicyAssertion>> contentCombinations = PolicyUtils.Collections.combine(normalizedContentBase, normalizedContentOptions, true);
for (Collection<PolicyAssertion> contentOption : contentCombinations) {
options.add(AssertionSet.createAssertionSet(contentOption));
}
}
return options;
}
private List<PolicyAssertion> normalizeRawAssertion(final RawAssertion assertion) throws AssertionCreationException, PolicyException {
List<PolicyAssertion> parameters;
if (assertion.parameters.isEmpty()) {
parameters = null;
} else {
parameters = new ArrayList<PolicyAssertion>(assertion.parameters.size());
for (ModelNode parameterNode : assertion.parameters) {
parameters.add(createPolicyAssertionParameter(parameterNode));
}
}
final List<AssertionSet> nestedAlternatives = new LinkedList<AssertionSet>();
if (assertion.nestedAlternatives != null && !assertion.nestedAlternatives.isEmpty()) {
final Queue<RawAlternative> nestedAlternativeQueue = new LinkedList<RawAlternative>(assertion.nestedAlternatives);
RawAlternative rawAlternative;
while((rawAlternative = nestedAlternativeQueue.poll()) != null) {
nestedAlternatives.addAll(normalizeRawAlternative(rawAlternative));
}
// if there is only a single result, we can add it direclty to the content base collection
// more elements in the result indicate that we will have to create combinations
}
final List<PolicyAssertion> assertionOptions = new LinkedList<PolicyAssertion>();
final boolean nestedAlternativesAvailable = !nestedAlternatives.isEmpty();
if (nestedAlternativesAvailable) {
for (AssertionSet nestedAlternative : nestedAlternatives) {
assertionOptions.add(createPolicyAssertion(assertion.originalNode.getNodeData(), parameters, nestedAlternative));
}
} else {
assertionOptions.add(createPolicyAssertion(assertion.originalNode.getNodeData(), parameters, null));
}
return assertionOptions;
}
private static PolicyAssertion createPolicyAssertionParameter(final ModelNode parameterNode) throws AssertionCreationException, PolicyException {
if (parameterNode.getType() != ModelNode.Type.ASSERTION_PARAMETER_NODE) {
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0065_INCONSISTENCY_IN_POLICY_SOURCE_MODEL(parameterNode.getType())));
}
List<PolicyAssertion> childParameters = null;
if (parameterNode.hasChildren()) {
childParameters = new ArrayList<PolicyAssertion>(parameterNode.childrenSize());
for (ModelNode childParameterNode : parameterNode) {
childParameters.add(createPolicyAssertionParameter(childParameterNode));
}
}
return createPolicyAssertion(parameterNode.getNodeData(), childParameters, null /* parameters do not have any nested alternatives */);
}
private static PolicyAssertion createPolicyAssertion(final AssertionData data, final Collection<PolicyAssertion> assertionParameters, final AssertionSet nestedAlternative) throws AssertionCreationException {
final String assertionNamespace = data.getName().getNamespaceURI();
final PolicyAssertionCreator domainSpecificPAC = assertionCreators.get(assertionNamespace);
if (domainSpecificPAC == null) {
return defaultCreator.createAssertion(data, assertionParameters, nestedAlternative, null);
} else {
return domainSpecificPAC.createAssertion(data, assertionParameters, nestedAlternative, defaultCreator);
}
}
}
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