org.springframework.core.io.AbstractPathResolvingPropertyEditor 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.core.io;
import java.beans.PropertyEditorSupport;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Abstract base class for PropertyEditors that need
* to resolve placeholders in paths.
*
* A path may contain ${...} placeholders, to be resolved as
* system properties: e.g. ${user.dir}.
*
* @author Juergen Hoeller
* @since 1.1.2
* @see #PLACEHOLDER_PREFIX
* @see #PLACEHOLDER_SUFFIX
* @see System#getProperty(String)
*/
public class AbstractPathResolvingPropertyEditor extends PropertyEditorSupport {
public static final String PLACEHOLDER_PREFIX = "${";
public static final String PLACEHOLDER_SUFFIX = "}";
protected static final Log logger = LogFactory.getLog(AbstractPathResolvingPropertyEditor.class);
/**
* Resolve the given path, replacing ${...} placeholders with
* corresponding system property values if necessary.
* @param path the original file path
* @return the resolved file path
* @see #PLACEHOLDER_PREFIX
* @see #PLACEHOLDER_SUFFIX
*/
protected String resolvePath(String path) {
StringBuffer buf = new StringBuffer(path);
// 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 = path.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);
String propVal = System.getProperty(placeholder);
if (propVal != null) {
buf.replace(startIndex, endIndex + PLACEHOLDER_SUFFIX.length(), propVal);
startIndex = buf.toString().indexOf(PLACEHOLDER_PREFIX, startIndex + propVal.length());
}
else {
logger.warn("Could not resolve placeholder '" + placeholder +
"' in resource path [" + path + "] as system property");
startIndex = buf.toString().indexOf(PLACEHOLDER_PREFIX, endIndex + PLACEHOLDER_SUFFIX.length());
}
}
else {
startIndex = -1;
}
}
return buf.toString();
}
}