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package atom.security;

import java.security.CodeSource;
import java.security.Permission;
import java.security.PermissionCollection;
import java.security.Permissions;
import java.security.Policy;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;

/**
 * The purpose of CompositePolicy is to allow any number of Policy's to be in
 * effect at one time.
 *
 * @author Alex Voloshyn
 * @version 1.0 5/18/2013
 */
public final class CompositePolicy extends Policy {
    /**
     * Policy list.
     */
    private List policies = Collections.emptyList();

    /**
     * Default constructor.
     *
     * @param list list with policies
     */
    public CompositePolicy(final List list) {
        policies = new ArrayList<>(list);
    }

    @Override
    public PermissionCollection getPermissions(final ProtectionDomain domain) {
        final Permissions permissions = new Permissions();
        for (Policy policy : policies) {
            final PermissionCollection perms = policy.getPermissions(domain);
            final Enumeration elements = perms.elements();
            while (elements.hasMoreElements()) {
                final Permission permission = elements.nextElement();
                permissions.add(permission);
            }
        }
        return permissions;
    }

    @Override
    public boolean implies(final ProtectionDomain domain,
                           final Permission permission) {
        for (Policy policy : policies) {
            if (policy.implies(domain, permission)) {
                return true;
            }
        }

        return false;
    }

    @Override
    public PermissionCollection getPermissions(final CodeSource source) {
        final Permissions permissions = new Permissions();
        for (Policy policy : policies) {
            final PermissionCollection perms = policy.getPermissions(source);
            final Enumeration elements = perms.elements();
            while (elements.hasMoreElements()) {
                final Permission permission = elements.nextElement();
                permissions.add(permission);
            }
        }
        return permissions;
    }

    @Override
    public void refresh() {
        for (Policy policy : policies) {
            policy.refresh();
        }
    }
}