/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      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.eclipse.webdav.client;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import org.eclipse.webdav.ILocator;
import org.eclipse.webdav.internal.kernel.*;

/**
 * The <code>ResourceHandle</code> class represents an
 * ordinary resource in the system. It subclasses <code>AbstractResourceHandle</code>
 * and overrides some of its methods in order to provide specific behaviour for
 * this resource type.
 * <p>
 * <b>Note:</b> This class/interface is part of an interim API that is still under 
 * development and expected to change significantly before reaching stability. 
 * It is being made available at this early stage to solicit feedback from pioneering 
 * adopters on the understanding that any code that uses this API will almost 
 * certainly be broken (repeatedly) as the API evolves.
 * </p>
 */
public class ResourceHandle extends AbstractResourceHandle {

    /**
     * Creates a new <code>ResourceHandle</code> from the given
     * <code>DAVClient</code> and <code>Locator</code>.
     *
     * @param davClient
     * @param locator
     */
    public ResourceHandle(DAVClient davClient, ILocator locator) {
        super(davClient, locator);
    }

    /**
     * Check out this resource. Returns a resource handle on the checked out
     * version selector, or the working resource if a version is checked out.
     */
    public AbstractResourceHandle checkOut() throws DAVException {
        ILocator locator = protectedCheckOut();
        return new ResourceHandle(davClient, locator);
    }

    /**
     * Persistently create this resource instance in the repository.
     * <p>
     * Note that the usual method for creating an instance of a non-collection
     * resource would be setContent(InputStream).
     *
     * @exception DAVException if there was a problem creating this resource
     * @see AbstractResourceHandle#setContent(InputStream)
     */
    public void create() throws DAVException {
        setContent(new ByteArrayInputStream(new byte[0]));
    }

    /**
     * Check to see if the resource is an activity resource.
     * <p>
     * The resource is an activity resource if it has
     * <DAV:subactivity-set> in the
     * <DAV:supported-live-properties-set>.</p>
     *
     * @return <code>true</code> if the resource is an activity
     * and <code>false</code> otherwise.
     * @throws DAVException if a problem occurs determining the state
     * of the resource.
     */
    public boolean isActivity() throws DAVException {
        return supportsLiveProperty(DAV_SUBACTIVITY_SET);
    }

    /**
     * Check to see if the resource is a baseline resource.
     * <p>
     * The resource is a baseline resource if it has
     * <DAV:baseline-collection> in the
     * <DAV:supported-live-properties-set>.</p>
     *
     * @return <code>true</code> if the resource is a baseline
     * and <code>false</code> otherwise.
     * @throws DAVException if a problem occurs determining the state
     * of the resource.
     */
    public boolean isBaseline() throws DAVException {
        return supportsLiveProperty(DAV_BASELINE_COLLECTION);
    }

    /**
     * Check to see if the resource is a version-controlled configuration
     * resource.
     * <p>
     * The resource is a version-controlled configuration resource if it has
     * <DAV:baseline-controlled-collection> in the
     * <DAV:supported-live-properties-set>.</p>
     *
     * @return <code>true</code> if the resource is a version-controlled
     * configuration and <code>false</code> otherwise.
     * @throws DAVException if a problem occurs determining the state
     * of the resource.
     */
    public boolean isVersionControlledConfiguration() throws DAVException {
        return supportsLiveProperty(DAV_BASELINE_CONTROLLED_COLLECTION);
    }

    /**
     * Check to see if the resource is a version history resource.
     * <p>
     * The resource is a version history resource if it has
     * <DAV:root-version> in the
     * <DAV:supported-live-properties-set>.</p>
     *
     * @return <code>true</code> if the resource is a version history
     * and <code>false</code> otherwise.
     * @throws DAVException if a problem occurs determining the state
     * of the resource.
     */
    public boolean isVersionHistory() throws DAVException {
        return supportsLiveProperty(DAV_ROOT_VERSION);
    }
}