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/*
 * Copyright 2002-2006 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.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Helper class for resolving placeholders in texts. Usually applied to file paths.
 *
 * 

A text may contain ${...} placeholders, to be resolved as * system properties: e.g. ${user.dir}. * * @author Juergen Hoeller * @since 1.2.5 * @see #PLACEHOLDER_PREFIX * @see #PLACEHOLDER_SUFFIX * @see System#getProperty(String) */ public abstract class SystemPropertyUtils { /** Prefix for system property placeholders: "${" */ public static final String PLACEHOLDER_PREFIX = "${"; /** Suffix for system property placeholders: "}" */ public static final String PLACEHOLDER_SUFFIX = "}"; private static final Log logger = LogFactory.getLog(SystemPropertyUtils.class); /** * Resolve ${...} placeholders in the given text, * replacing them with corresponding system property values. * @param text the String to resolve * @return the resolved String * @see #PLACEHOLDER_PREFIX * @see #PLACEHOLDER_SUFFIX */ public static String resolvePlaceholders(String text) { StringBuffer buf = new StringBuffer(text); // The following code does not use JDK 1.4's StringBuffer.indexOf(String) // method to retain JDK 1.3 compatibility. The slight loss in performance // is not really relevant, as this code will typically just run on startup. int startIndex = text.indexOf(PLACEHOLDER_PREFIX); while (startIndex != -1) { int endIndex = buf.toString().indexOf(PLACEHOLDER_SUFFIX, startIndex + PLACEHOLDER_PREFIX.length()); if (endIndex != -1) { String placeholder = buf.substring(startIndex + PLACEHOLDER_PREFIX.length(), endIndex); int nextIndex = endIndex + PLACEHOLDER_SUFFIX.length(); try { String propVal = System.getProperty(placeholder); if (propVal == null) { // Fall back to searching the system environment. propVal = System.getenv(placeholder); } if (propVal != null) { buf.replace(startIndex, endIndex + PLACEHOLDER_SUFFIX.length(), propVal); nextIndex = startIndex + propVal.length(); } else { if (logger.isWarnEnabled()) { logger.warn("Could not resolve placeholder '" + placeholder + "' in [" + text + "] as system property: neither system property nor environment variable found"); } } } catch (Throwable ex) { if (logger.isWarnEnabled()) { logger.warn("Could not resolve placeholder '" + placeholder + "' in [" + text + "] as system property: " + ex); } } startIndex = buf.toString().indexOf(PLACEHOLDER_PREFIX, nextIndex); } else { startIndex = -1; } } return buf.toString(); } }





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