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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.impl.hotupdate;
import java.io.File;
/**
* Keeps track of if a file or directory has been modified since a previous check
*/
public class LastModifiedTracker {
private File targetFile;
private Long lastModified;
public LastModifiedTracker(File targetFile) {
this.targetFile = targetFile;
checkModified();
}
public void reset() {
lastModified = null;
}
public boolean checkModified() {
long newLastModified = getNewLastModified(targetFile);
if (lastModified == null) {
lastModified = newLastModified;
return false;
}
if (newLastModified > lastModified) {
lastModified = newLastModified;
return true;
}
return false;
}
protected long getNewLastModified(File f) {
if (!f.exists()) return 0;
if (f.isFile()) return f.lastModified();
long newLastModified = f.lastModified();
for (File fx : f.listFiles()) {
long fxLastModified = getNewLastModified(fx);
if (fxLastModified > newLastModified){
newLastModified = fxLastModified;
}
}
return newLastModified;
}
}
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