/*
 * 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.karaf.webconsole.osgi.config;

import java.util.Arrays;
import java.util.Iterator;

import org.apache.karaf.webconsole.core.table.advanced.BaseDataProvider;
import org.apache.karaf.webconsole.osgi.config.model.ConfigurationModel;
import org.apache.karaf.webconsole.osgi.config.model.ConfigurationNotFoundException;
import org.apache.wicket.model.IModel;
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;

/**
 * Data provider for configuration list.
 */
public class ConfigurationProvider extends BaseDataProvider<Configuration> {

    private static final long serialVersionUID = 1L;

    private Configuration[] configurations = new Configuration[0];
    private ConfigurationAdmin configurationAdmin;

    public ConfigurationProvider(ConfigurationAdmin configurationAdmin) {
        this.configurationAdmin = configurationAdmin;
    }

    public Iterator<? extends Configuration> iterator(long from, long count) {
        return Arrays.asList(Arrays.copyOfRange(getConfigurations(), (int) from, (int) from + (int) count)).iterator();
    }

    public IModel<Configuration> model(Configuration object) {
        return new ConfigurationModel(object, configurationAdmin);
    }

    public long size() {
        return getConfigurations().length;
    }

    public Configuration[] getConfigurations() {
        try {
            configurations = configurationAdmin.listConfigurations(null);
        } catch (Exception e) {
            throw new ConfigurationNotFoundException(null, e);
        }
        return configurations;
    }
    
    @Override
    public void detach() {
        super.detach();
        configurations = null;
    }
}