Added FileWatcher and LastModifiedFileFilter.

src/main/java/info/fetter/logstashforwarder/FileState.java

@@ -0,0 +1,55 @@
+package info.fetter.logstashforwarder;
+
+/*
+ * Copyright 2015 Didier Fetter
+ *
+ * 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.
+ *
+ */
+
+import java.io.File;
+import java.io.IOException;
+
+public class FileState {
+	private File file;
+	private String filePath;
+	private long lastModified;
+	private long size;
+	
+	public FileState(File file) throws IOException {
+		this.file = file;
+		filePath = file.getCanonicalPath();
+	}
+	
+	public void refresh() {
+		lastModified = file.lastModified();
+		size = file.length();
+	}
+
+	public File getFile() {
+		return file;
+	}
+
+	public long getLastModified() {
+		return lastModified;
+	}
+
+	public long getSize() {
+		return size;
+	}
+	
+	public String getFilePath() {
+		return filePath;
+	}
+	
+}