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Tools to assist in the reading of configuration/preferences files in various formats

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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.apache.commons.configuration2.web;

import java.applet.Applet;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Objects;

/**
 * A configuration wrapper to read applet parameters. This configuration is read only, adding or removing a property
 * will throw an UnsupportedOperationException.
 *
 * @since 1.1
 */
public class AppletConfiguration extends BaseWebConfiguration {

    /** Stores the wrapped applet. */
    protected Applet applet;

    /**
     * Create an AppletConfiguration using the initialization parameters of the specified Applet.
     *
     * @param applet the applet
     */
    public AppletConfiguration(final Applet applet) {
        this.applet = Objects.requireNonNull(applet, "applet");
    }

    @Override
    protected Iterator getKeysInternal() {
        final String[][] paramsInfo = applet.getParameterInfo();
        final String[] keys = new String[paramsInfo != null ? paramsInfo.length : 0];
        if (paramsInfo != null) {
            for (int i = 0; i < keys.length; i++) {
                keys[i] = paramsInfo[i][0];
            }
        }
        return Arrays.asList(keys).iterator();
    }

    @Override
    protected Object getPropertyInternal(final String key) {
        return handleDelimiters(applet.getParameter(key));
    }
}