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package com.sun.xml.ws.policy;
import com.sun.xml.ws.policy.privateutil.PolicyLogger;
import com.sun.xml.ws.policy.privateutil.LocalizationMessages;
import com.sun.xml.ws.policy.spi.PolicyAssertionValidator.Fitness;
import java.util.Collection;
import java.util.LinkedList;
/**
* Contains static methods for policy alternative selection. Given policy map is changed so that
* each effective policy contains at most one policy alternative. Uses domain
* specific @see com.sun.xml.ws.policy.spi.PolicySelector
* to find out whether particular policy assertion is actually supported.
*
* @author Jakub Podlesak (jakub.podlesak at sun.com)
*/
public class EffectiveAlternativeSelector {
private enum AlternativeFitness {
UNEVALUATED {
AlternativeFitness combine(final Fitness assertionFitness) {
switch (assertionFitness) {
case UNKNOWN:
return UNKNOWN;
case UNSUPPORTED:
return UNSUPPORTED;
case SUPPORTED:
return SUPPORTED;
case INVALID:
return INVALID;
default:
return UNEVALUATED;
}
}
},
INVALID {
AlternativeFitness combine(final Fitness assertionFitness) {
return INVALID;
}
},
UNKNOWN {
AlternativeFitness combine(final Fitness assertionFitness) {
switch (assertionFitness) {
case UNKNOWN:
return UNKNOWN;
case UNSUPPORTED:
return UNSUPPORTED;
case SUPPORTED:
return PARTIALLY_SUPPORTED;
case INVALID:
return INVALID;
default:
return UNEVALUATED;
}
}
},
UNSUPPORTED {
AlternativeFitness combine(final Fitness assertionFitness) {
switch (assertionFitness) {
case UNKNOWN:
case UNSUPPORTED:
return UNSUPPORTED;
case SUPPORTED:
return PARTIALLY_SUPPORTED;
case INVALID:
return INVALID;
default:
return UNEVALUATED;
}
}
},
PARTIALLY_SUPPORTED {
AlternativeFitness combine(final Fitness assertionFitness) {
switch (assertionFitness) {
case UNKNOWN:
case UNSUPPORTED:
case SUPPORTED:
return PARTIALLY_SUPPORTED;
case INVALID:
return INVALID;
default:
return UNEVALUATED;
}
}
},
SUPPORTED_EMPTY {
AlternativeFitness combine(final Fitness assertionFitness) {
// will not localize - this exception may not occur if there is no programatic error in this class
throw new UnsupportedOperationException("Combine operation was called unexpectedly on 'SUPPORTED_EMPTY' alternative fitness enumeration state.");
}
},
SUPPORTED {
AlternativeFitness combine(final Fitness assertionFitness) {
switch (assertionFitness) {
case UNKNOWN:
case UNSUPPORTED:
return PARTIALLY_SUPPORTED;
case SUPPORTED:
return SUPPORTED;
case INVALID:
return INVALID;
default:
return UNEVALUATED;
}
}
};
abstract AlternativeFitness combine(Fitness assertionFitness);
}
private static final PolicyLogger LOGGER = PolicyLogger.getLogger(EffectiveAlternativeSelector.class);
/**
* Does the selection for policy map bound to given modifier
*
* @param modifier @see EffectivePolicyModifier which the map is bound to
*/
public static final void doSelection(final EffectivePolicyModifier modifier) throws PolicyException {
final PolicyMap map = modifier.getMap();
final AssertionValidationProcessor validationProcessor = AssertionValidationProcessor.getInstance();
for (PolicyMapKey mapKey : map.getAllServiceScopeKeys()) {
final Policy oldPolicy = map.getServiceEffectivePolicy(mapKey);
modifier.setNewEffectivePolicyForServiceScope(mapKey, selectBestAlternative(oldPolicy, validationProcessor));
}
for (PolicyMapKey mapKey : map.getAllEndpointScopeKeys()) {
final Policy oldPolicy = map.getEndpointEffectivePolicy(mapKey);
modifier.setNewEffectivePolicyForEndpointScope(mapKey, selectBestAlternative(oldPolicy, validationProcessor));
}
for (PolicyMapKey mapKey : map.getAllOperationScopeKeys()) {
final Policy oldPolicy = map.getOperationEffectivePolicy(mapKey);
modifier.setNewEffectivePolicyForOperationScope(mapKey, selectBestAlternative(oldPolicy, validationProcessor));
}
for (PolicyMapKey mapKey : map.getAllInputMessageScopeKeys()) {
final Policy oldPolicy = map.getInputMessageEffectivePolicy(mapKey);
modifier.setNewEffectivePolicyForInputMessageScope(mapKey, selectBestAlternative(oldPolicy, validationProcessor));
}
for (PolicyMapKey mapKey : map.getAllOutputMessageScopeKeys()) {
final Policy oldPolicy = map.getOutputMessageEffectivePolicy(mapKey);
modifier.setNewEffectivePolicyForOutputMessageScope(mapKey, selectBestAlternative(oldPolicy, validationProcessor));
}
for (PolicyMapKey mapKey : map.getAllFaultMessageScopeKeys()) {
final Policy oldPolicy = map.getFaultMessageEffectivePolicy(mapKey);
modifier.setNewEffectivePolicyForFaultMessageScope(mapKey, selectBestAlternative(oldPolicy, validationProcessor));
}
}
private static Policy selectBestAlternative(final Policy policy, final AssertionValidationProcessor validationProcessor) throws PolicyException {
AssertionSet bestAlternative = null;
AlternativeFitness bestAlternativeFitness = AlternativeFitness.UNEVALUATED;
for (AssertionSet alternative : policy) {
AlternativeFitness alternativeFitness = (alternative.isEmpty()) ? AlternativeFitness.SUPPORTED_EMPTY : AlternativeFitness.UNEVALUATED;
for ( PolicyAssertion assertion : alternative ) {
final Fitness assertionFitness = validationProcessor.validateClientSide(assertion);
switch(assertionFitness) {
case UNKNOWN:
case UNSUPPORTED:
case INVALID:
LOGGER.warning(LocalizationMessages.WSP_0075_PROBLEMATIC_ASSERTION_STATE(assertion.getName(), assertionFitness));
break;
default:
break;
}
alternativeFitness = alternativeFitness.combine(assertionFitness);
}
if (bestAlternativeFitness.compareTo(alternativeFitness) < 0) {
// better alternative found
bestAlternative = alternative;
bestAlternativeFitness = alternativeFitness;
}
if (bestAlternativeFitness == AlternativeFitness.SUPPORTED) {
// all assertions supported by at least one selector
break;
}
}
switch (bestAlternativeFitness) {
case INVALID:
throw LOGGER.logSevereException(new PolicyException(LocalizationMessages.WSP_0053_INVALID_CLIENT_SIDE_ALTERNATIVE()));
case UNKNOWN:
case UNSUPPORTED:
case PARTIALLY_SUPPORTED:
LOGGER.warning(LocalizationMessages.WSP_0019_SUBOPTIMAL_ALTERNATIVE_SELECTED(bestAlternativeFitness));
break;
default:
break;
}
Collection<AssertionSet> alternativeSet = null;
if (bestAlternative != null) {
// return a policy containing just the picked alternative
alternativeSet = new LinkedList<AssertionSet>();
alternativeSet.add(bestAlternative);
}
return Policy.createPolicy(policy.getName(), policy.getId(), alternativeSet);
}
}
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