--- /dev/null
+/*\r
+ * Copyright 2002-2008 the original author or authors.\r
+ *\r
+ * Licensed under the Apache License, Version 2.0 (the "License");\r
+ * you may not use this file except in compliance with the License.\r
+ * You may obtain a copy of the License at\r
+ *\r
+ * http://www.apache.org/licenses/LICENSE-2.0\r
+ *\r
+ * Unless required by applicable law or agreed to in writing, software\r
+ * distributed under the License is distributed on an "AS IS" BASIS,\r
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ * See the License for the specific language governing permissions and\r
+ * limitations under the License.\r
+ */\r
+\r
+package org.argeo.slc.osgiboot.internal.springutil;\r
+\r
+/**\r
+ * Helper class for resolving placeholders in texts. Usually applied to file paths.\r
+ *\r
+ * <p>A text may contain <code>${...}</code> placeholders, to be resolved as\r
+ * system properties: e.g. <code>${user.dir}</code>.\r
+ *\r
+ * @author Juergen Hoeller\r
+ * @since 1.2.5\r
+ * @see #PLACEHOLDER_PREFIX\r
+ * @see #PLACEHOLDER_SUFFIX\r
+ * @see System#getProperty(String)\r
+ */\r
+public abstract class SystemPropertyUtils {\r
+\r
+ /** Prefix for system property placeholders: "${" */\r
+ public static final String PLACEHOLDER_PREFIX = "${";\r
+\r
+ /** Suffix for system property placeholders: "}" */\r
+ public static final String PLACEHOLDER_SUFFIX = "}";\r
+\r
+\r
+ /**\r
+ * Resolve ${...} placeholders in the given text,\r
+ * replacing them with corresponding system property values.\r
+ * @param text the String to resolve\r
+ * @return the resolved String\r
+ * @see #PLACEHOLDER_PREFIX\r
+ * @see #PLACEHOLDER_SUFFIX\r
+ */\r
+ public static String resolvePlaceholders(String text) {\r
+ StringBuffer buf = new StringBuffer(text);\r
+\r
+ int startIndex = buf.indexOf(PLACEHOLDER_PREFIX);\r
+ while (startIndex != -1) {\r
+ int endIndex = buf.indexOf(PLACEHOLDER_SUFFIX, startIndex + PLACEHOLDER_PREFIX.length());\r
+ if (endIndex != -1) {\r
+ String placeholder = buf.substring(startIndex + PLACEHOLDER_PREFIX.length(), endIndex);\r
+ int nextIndex = endIndex + PLACEHOLDER_SUFFIX.length();\r
+ try {\r
+ String propVal = System.getProperty(placeholder);\r
+ if (propVal == null) {\r
+ // Fall back to searching the system environment.\r
+ //propVal = System.getenv(placeholder);// mbaudier - 2009-07-26\r
+ throw new Error("getenv no longer supported, use properties and -D instead: " + placeholder);\r
+ }\r
+ if (propVal != null) {\r
+ buf.replace(startIndex, endIndex + PLACEHOLDER_SUFFIX.length(), propVal);\r
+ nextIndex = startIndex + propVal.length();\r
+ }\r
+ else {\r
+ System.err.println("Could not resolve placeholder '" + placeholder + "' in [" + text +\r
+ "] as system property: neither system property nor environment variable found");\r
+ }\r
+ }\r
+ catch (Throwable ex) {\r
+ System.err.println("Could not resolve placeholder '" + placeholder + "' in [" + text +\r
+ "] as system property: " + ex);\r
+ }\r
+ startIndex = buf.indexOf(PLACEHOLDER_PREFIX, nextIndex);\r
+ }\r
+ else {\r
+ startIndex = -1;\r
+ }\r
+ }\r
+\r
+ return buf.toString();\r
+ }\r
+\r
+}\r