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

import java.util.Collection;
import com.sun.xml.ws.policy.PolicyException;

/**
 * Abstract class defines interface for policy model marshaller implementations that are specific to underlying
 * persistence layer.
 *
 * @author Marek Potociar
 */
public abstract class PolicyModelMarshaller {
    private static final PolicyModelMarshaller defaultXmlMarshaller = new XmlPolicyModelMarshaller(false);
    private static final PolicyModelMarshaller invisibleAssertionXmlMarshaller = new XmlPolicyModelMarshaller(true);
    
    /**
     * Default constructor to ensure we have a common model marshaller base, but only our API classes implemented in this 
     * package will be able to extend this abstract class. This is to restrict attempts of extending the class from 
     * a client code.
     */
    PolicyModelMarshaller() {  
        // nothing to instantiate
    }
    
    /**
     * Marshalls the policy source model using provided storage reference
     *
     * @param model policy source model to be marshalled
     * @param storage reference to underlying storage that should be used for model marshalling
     * @throws PolicyException If marshalling failed
     */
    public abstract void marshal(PolicySourceModel model, Object storage) throws PolicyException;

    /**
     * Marshalls the collection of policy source models using provided storage reference
     *
     * @param models collection of policy source models to be marshalled
     * @param storage reference to underlying storage that should be used for model marshalling
     * @throws PolicyException If marshalling failed
     */
    public abstract void marshal(Collection<PolicySourceModel> models, Object storage) throws PolicyException;

    /**
     * Factory methods that returns a marshaller instance based on input parameter.
     *
     * @param marshallInvisible boolean parameter indicating whether the marshaller 
     *        returned by this method does marshall private assertions or not.
     * 
     * @return policy model marshaller that either marshalls private assertions or not
     *         based on the input argument.
     */
    public static PolicyModelMarshaller getXmlMarshaller(final boolean marshallInvisible) {
        return (marshallInvisible) ? invisibleAssertionXmlMarshaller : defaultXmlMarshaller;
    }
}