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 * This code is distributed in the hope that it will be useful, but WITHOUT

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 * accompanied this code).

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package com.sun.xml.internal.ws.policy;

import com.sun.xml.internal.ws.policy.privateutil.PolicyLogger;

import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;

import com.sun.xml.internal.ws.policy.spi.PolicyAssertionValidator;

import static com.sun.xml.internal.ws.policy.privateutil.LocalizationMessages.WSP_0076_NO_SERVICE_PROVIDERS_FOUND;

import java.util.Collection;

import java.util.LinkedList;

/**

 * Provides methods for assertion validation.

 *

 * @author Marek Potociar (marek.potociar at sun.com)

 * @author Fabian Ritzmann

 */

public class AssertionValidationProcessor {

    private static final PolicyLogger LOGGER = PolicyLogger.getLogger(AssertionValidationProcessor.class);

    private final Collection<PolicyAssertionValidator> validators = new LinkedList<PolicyAssertionValidator>();

    /**

     * This constructor instantiates the object with a set of dynamically

     * discovered PolicyAssertionValidators.

     *

     * @throws PolicyException Thrown if the set of dynamically discovered

     *   PolicyAssertionValidators is empty.

     */

    private AssertionValidationProcessor() throws PolicyException {

        this(null);

    }

    /**

     * This constructor adds the given set of policy validators to the dynamically

     * discovered PolicyAssertionValidators.

     *

     * This constructor is intended to be used by the JAX-WS com.sun.xml.internal.ws.policy.api.ValidationProcessor.

     *

     * @param policyValidators A set of PolicyAssertionValidators. May be null

     * @throws PolicyException Thrown if the set of given PolicyAssertionValidators

     *   and dynamically discovered PolicyAssertionValidators is empty.

     */

    protected AssertionValidationProcessor(final Collection<PolicyAssertionValidator> policyValidators)

            throws PolicyException {

        for(PolicyAssertionValidator validator : PolicyUtils.ServiceProvider.load(PolicyAssertionValidator.class)) {

            validators.add(validator);

        }

        if (policyValidators != null) {

            for (PolicyAssertionValidator validator : policyValidators) {

                validators.add(validator);

            }

        }

        if (validators.size() == 0) {

            throw LOGGER.logSevereException(new PolicyException(WSP_0076_NO_SERVICE_PROVIDERS_FOUND(PolicyAssertionValidator.class.getName())));

        }

    }

    /**

     * Factory method that returns singleton instance of the class.

     *

     * This method is only intended to be used by code that has no dependencies on

     * JAX-WS. Otherwise use com.sun.xml.internal.ws.api.policy.ValidationProcessor.

     *

     * @return singleton An instance of the class.

     * @throws PolicyException If instantiation failed.

     */

    public static AssertionValidationProcessor getInstance() throws PolicyException {

        return new AssertionValidationProcessor();

    }

    /**

     * Validates fitness of the {@code assertion} on the client side.

     *

     * return client side {@code assertion} fitness

     * @param assertion The assertion to be validated.

     * @return The fitness of the assertion on the client side.

     * @throws PolicyException If validation failed.

     */

    public PolicyAssertionValidator.Fitness validateClientSide(final PolicyAssertion assertion) throws PolicyException {

        PolicyAssertionValidator.Fitness assertionFitness = PolicyAssertionValidator.Fitness.UNKNOWN;

        for ( PolicyAssertionValidator validator : validators ) {

            assertionFitness = assertionFitness.combine(validator.validateClientSide(assertion));

            if (assertionFitness == PolicyAssertionValidator.Fitness.SUPPORTED) {

                break;

            }

        }

        return assertionFitness;

    }

    /**

     * Validates fitness of the {@code assertion} on the server side.

     *

     * return server side {@code assertion} fitness

     * @param assertion The assertion to be validated.

     * @return The fitness of the assertion on the server side.

     * @throws PolicyException If validation failed.

     */

    public PolicyAssertionValidator.Fitness validateServerSide(final PolicyAssertion assertion) throws PolicyException {

        PolicyAssertionValidator.Fitness assertionFitness = PolicyAssertionValidator.Fitness.UNKNOWN;

        for (PolicyAssertionValidator validator : validators) {

            assertionFitness = assertionFitness.combine(validator.validateServerSide(assertion));

            if (assertionFitness == PolicyAssertionValidator.Fitness.SUPPORTED) {

                break;

            }

        }

        return assertionFitness;

    }

}