com.opensymphony.xwork2.util.fs.FileRevision Maven / Gradle / Ivy
/*
* 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 com.opensymphony.xwork2.util.fs;
import java.io.File;
import java.net.URISyntaxException;
import java.net.URL;
/**
* Represents file resource revision, used for file://* resources
*/
public class FileRevision extends Revision {
private File file;
private long lastModified;
public static Revision build(URL fileUrl) {
File file;
try {
if (fileUrl != null) {
file = new File(fileUrl.toURI());
} else {
return null;
}
} catch (URISyntaxException e) {
file = new File(fileUrl.getPath());
} catch (Throwable t) {
return null;
}
if (file.exists() && file.canRead()) {
long lastModified = file.lastModified();
return new FileRevision(file, lastModified);
}
return null;
}
private FileRevision(File file, long lastUpdated) {
if (file == null) {
throw new IllegalArgumentException("File cannot be null");
}
this.file = file;
this.lastModified = lastUpdated;
}
public File getFile() {
return file;
}
public boolean needsReloading() {
return this.lastModified < this.file.lastModified();
}
}