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org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer Maven / Gradle / Ivy

/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * 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.springframework.beans.factory.config;

import java.util.Properties;
import java.util.prefs.Preferences;

import org.springframework.beans.factory.InitializingBean;

/**
 * Subclass of PropertyPlaceholderConfigurer that supports J2SE 1.4's
 * Preferences API (java.util.prefs).
 *
 * 

Tries to resolve placeholders as keys first in the user preferences, * then in the system preferences, then in this configurer's properties. * Thus, behaves like PropertyPlaceholderConfigurer if no corresponding * preferences defined. * *

Supports custom paths for the system and user preferences trees. * Uses the respective root nodes if not specified. * * @author Juergen Hoeller * @since 16.02.2004 * @see #setSystemTreePath * @see #setUserTreePath * @see java.util.prefs.Preferences */ public class PreferencesPlaceholderConfigurer extends PropertyPlaceholderConfigurer implements InitializingBean { private String systemTreePath; private String userTreePath; private Preferences systemPrefs; private Preferences userPrefs; /** * Set the path in the system preferences tree to use for resolving * placeholders. Uses the root node by default. */ public void setSystemTreePath(String systemTreePath) { this.systemTreePath = systemTreePath; } /** * Set the path in the system preferences tree to use for resolving * placeholders. Uses the root node by default. */ public void setUserTreePath(String userTreePath) { this.userTreePath = userTreePath; } /** * This implementation eagerly fetches the Preferences instances * for the required system and user tree nodes. */ public void afterPropertiesSet() { this.systemPrefs = (this.systemTreePath != null) ? Preferences.systemRoot().node(this.systemTreePath) : Preferences.systemRoot(); this.userPrefs = (this.userTreePath != null) ? Preferences.userRoot().node(this.userTreePath) : Preferences.userRoot(); } /** * This implementation tries to resolve placeholders as keys first * in the user preferences, then in the system preferences, then in * the passed-in properties. */ protected String resolvePlaceholder(String placeholder, Properties props) { String value = this.userPrefs.get(placeholder, null); if (value == null) { value = this.systemPrefs.get(placeholder, null); if (value == null) { value = props.getProperty(placeholder); } } return value; } }





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