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75 lines
2.7 KiB
Java
75 lines
2.7 KiB
Java
/*
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* Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details
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* (http://www.gnu.org/copyleft/lesser.html).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package jcckit.util;
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/**
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* An implementation of {@link ConfigData} based on two instances of
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* {@link ConfigParameters}. The second one serves as a set of
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* default parameters. It will be used if the first one has not the requested
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* key-value pair.
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*
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* @author Franz-Josef Elmer
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*/
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public class ConfigParametersBasedConfigData implements ConfigData {
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private ConfigParameters _config;
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private ConfigParameters _defaultConfig;
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/**
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* Creates an instance.
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* @param config A set of key-value pairs.
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* @param defaultConfig The default set of key-value pairs.
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*/
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public ConfigParametersBasedConfigData(ConfigParameters config,
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ConfigParameters defaultConfig) {
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_config = config;
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_defaultConfig = defaultConfig;
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}
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/**
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* Returns the full key.
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* @param key A (relative) key. <tt>null</tt> is not allowed.
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* @return the full key including path.
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*/
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public String getFullKey(String key) {
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return _config.getFullKey(key);
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}
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/**
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* Returns the value associated with this key.
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* @param key The relative key. <tt>null</tt> is not allowed.
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* @return the associated value. Will be <tt>null</tt> if no value exists
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* for <tt>key</tt>.
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*/
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public String get(String key) {
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String value = _config.get(key, null);
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return value == null ? _defaultConfig.get(key, null) : value;
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}
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/**
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* Returns the <tt>ConfigData</tt> object associated with this key.
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* @param key The relative key. <tt>null</tt> is not allowed.
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* @return the associated value. Will never return <tt>null</tt>.
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* Instead an empty <tt>ConfigData</tt> is returned.
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*/
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public ConfigData getNode(String key) {
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return new ConfigParametersBasedConfigData(_config.getNode(key),
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_defaultConfig.getNode(key));
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}
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}
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