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/*
 * 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.netbeans.modules.php.project;

import java.io.IOException;
import org.netbeans.spi.project.support.ant.EditableProperties;
import org.w3c.dom.Element;

/**
 * Represents an implementation of project update.
 * based on UpdateImplementation (java.common.api)
 * When the update support will be moved into ant based
 * project type from common java api this class can be removed.
 * @author Tomas Mysik, Tomas Zezula
 */
public interface UpdateImplementation {

        /**
     * Return true if the project is of current version.
     * @return true if the project is of current version.
     */
    boolean isCurrent();

    /**
     * Return true if the project can be updated.
     * @return true if the project can be updated.
     */
    boolean canUpdate();

    /**
     * Saving of update. If the project is of current version it should probably do nothing.
     * @param props project properties to be saved, can be null. There's no need to save them because
     *          {@link UpdateHelper} does it.
     * @throws IOException if error occurs during saving.
     */
    void saveUpdate(final EditableProperties props) throws IOException;

    /**
     * Creates probably an in memory update of shared configuration data and return it.
     * @return the configuration data that is available.
     * @see {@link UpdateHelper#getPrimaryConfigurationData(boolean)}
     */
    Element getUpdatedSharedConfigurationData();

    /**
     * Creates probably an in memory update of project properties.
     * @return a set of properties.
     * @see {@link UpdateHelper#getProperties(String)}
     */
    EditableProperties getUpdatedProjectProperties();

    UpdateImplementation NULL = new UpdateImplementation() {

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

        @Override
        public boolean canUpdate() {
            return false;
        }

        @Override
        public void saveUpdate(EditableProperties props) throws IOException {
            throw new UnsupportedOperationException("Nothing to do");
        }

        @Override
        public Element getUpdatedSharedConfigurationData() {
            throw new UnsupportedOperationException("Nothing to do");
        }

        @Override
        public EditableProperties getUpdatedProjectProperties() {
            throw new UnsupportedOperationException("Nothing to do");
        }
    };
}