emptyconfiguration.java

用java写的ftp服务器程序

// $Id: EmptyConfiguration.java 306758 2005-10-06 11:35:13 +0530 (Thu, 06 Oct 2005) rana_b $
/*
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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.ftpserver.ftplet;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;

/**
 * Empty configuration - always returns the default values.
 * 
 * @author <a href="mailto:[e-mail]">Rana Bhattacharyya</a>
 */
public 
class EmptyConfiguration implements Configuration {

    public final static EmptyConfiguration INSTANCE = new EmptyConfiguration();
    
    /**
     * Private constructor - use INSTANCE static variable.
     */
    private EmptyConfiguration() {
    }
    
    /**
     * Throw exception.
     */
    public String getString(String param) throws FtpException {
        throw new FtpException();
    }

    /**
     * Return default value.
     */
    public String getString(String patram, String defaultVal) {
        return defaultVal;
    }

    /**
     * Throw exception.
     */
    public int getInt(String patram) throws FtpException {
        throw new FtpException();
    }

    /**
     * Return default value.
     */
    public int getInt(String patram, int defaultVal) {
        return defaultVal;
    }

    /**
     * Throw exception.
     */
    public long getLong(String param) throws FtpException {
        throw new FtpException();
    }

    /**
     * Return default value.
     */
    public long getLong(String param, long defaultVal) {
        return defaultVal;
    }

    /**
     * Throw exception.
     */
    public boolean getBoolean(String patram) throws FtpException {
        throw new FtpException();
    }

    /**
     * Return default value.
     */
    public boolean getBoolean(String patram, boolean defaultVal) {
        return defaultVal;
    }

    /**
     * Throw exception.
     */
    public double getDouble(String patram) throws FtpException {
        throw new FtpException();
    }

    /**
     * Get default value.
     */
    public double getDouble(String patram, double defaultVal) {
        return defaultVal;
    }

    /**
     * Throw exception.
     */
    public Configuration getConfiguration(String param) throws FtpException {
        throw new FtpException();
    }

    /**
     * Return the default value.
     */
    public Configuration getConfiguration(String param, Configuration defaultVal) {
        return defaultVal;
    }
    
    /**
     * Get the property keys.
     */
    public Enumeration getKeys() {
        ArrayList empty = new ArrayList(2);
        return Collections.enumeration(empty);
    }
}