/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jena.permissions.model.impl;

import org.apache.jena.graph.Node;
import org.apache.jena.permissions.impl.ItemHolder;
import org.apache.jena.permissions.impl.SecuredItemInvoker;
import org.apache.jena.permissions.model.SecuredModel;
import org.apache.jena.permissions.model.SecuredProperty;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.shared.AuthenticationRequiredException;
import org.apache.jena.shared.ReadDeniedException;

/**
 * Implementation of SecuredProperty to be used by a SecuredItemInvoker proxy.
 */
public class SecuredPropertyImpl extends SecuredResourceImpl implements SecuredProperty {
    /**
     * Get an instance of SecuredProperty
     * 
     * @param securedModel the Secured Model to use.
     * @param property     The property to secure
     * @return The SecuredProperty
     */
    public static SecuredProperty getInstance(final SecuredModel securedModel, final Property property) {
        if (securedModel == null) {
            throw new IllegalArgumentException("SecuredModel may not be null");
        }
        if (property == null) {
            throw new IllegalArgumentException("Property may not be null");
        }

        // check that property has a securedModel.
        Property goodProp = property;
        if (goodProp.getModel() == null) {
            final Node n = property.asNode();
            if (property.isAnon()) {
                goodProp = securedModel.createProperty(n.getBlankNodeId().getLabelString());
            } else {
                goodProp = securedModel.createProperty(property.asNode().getURI());
            }
        }

        final ItemHolder<Property, SecuredProperty> holder = new ItemHolder<>(goodProp);
        final SecuredPropertyImpl checker = new SecuredPropertyImpl(securedModel, holder);
        // if we are going to create a duplicate proxy, just return this
        // one.
        if (goodProp instanceof SecuredProperty) {
            if (checker.isEquivalent((SecuredProperty) goodProp)) {
                return (SecuredProperty) goodProp;
            }
        }
        return holder.setSecuredItem(new SecuredItemInvoker(property.getClass(), checker));
    }

    // the item holder that contains this SecuredProperty
    private final ItemHolder<? extends Property, ? extends SecuredProperty> holder;

    /**
     * Constructor
     * 
     * @param securityEvaluator The security evaluator to use.
     * @param graphIRI          the graph IRI to validate against.
     * @param holder            The item holder that will contain this
     *                          SecuredProperty.
     */
    private SecuredPropertyImpl(final SecuredModel securedModel,
            final ItemHolder<? extends Property, ? extends SecuredProperty> holder) {
        super(securedModel, holder);
        this.holder = holder;
    }

    /**
     * @sec.graph Read
     * @throws ReadDeniedException
     * @throws AuthenticationRequiredException if user is not authenticated and is
     *                                         required to be.
     */
    @Override
    public int getOrdinal() throws ReadDeniedException, AuthenticationRequiredException {
        checkRead();
        return holder.getBaseItem().getOrdinal();
    }

    @Override
    public Property inModel(final Model m) {
        return (Property) super.inModel(m);
    }

    @Override
    public boolean isProperty() {
        return true;
    }
}
