From 7f1c49591f6d32efd26a7041c49c4fd76c844101 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Wed, 2 Jan 2013 11:07:13 +0100
Subject: [PATCH] Add a file query.

---
 .../pterodactylus/reactor/queries/FileQuery.java   | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/reactor/queries/FileQuery.java

diff --git a/src/main/java/net/pterodactylus/reactor/queries/FileQuery.java b/src/main/java/net/pterodactylus/reactor/queries/FileQuery.java
new file mode 100644
index 0000000..64a72f4
--- /dev/null
+++ b/src/main/java/net/pterodactylus/reactor/queries/FileQuery.java
@@ -0,0 +1,66 @@
+/*
+ * Reactor - FileQuery.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.reactor.queries;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.io.File;
+
+import net.pterodactylus.reactor.Query;
+import net.pterodactylus.reactor.states.FileState;
+
+/**
+ * Queries the filesystem about a file.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class FileQuery implements Query<FileState> {
+
+	/** The name of the file to query. */
+	private final String filename;
+
+	/**
+	 * Creates a new file query.
+	 *
+	 * @param filename
+	 *            The name of the file to query
+	 */
+	public FileQuery(String filename) {
+		this.filename = checkNotNull(filename, "filename must not be null");
+	}
+
+	//
+	// QUERY METHODS
+	//
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public FileState state() {
+		File file = new File(filename);
+		if (!file.exists()) {
+			return new FileState(false, false, -1, -1);
+		}
+		if (!file.canRead()) {
+			return new FileState(true, false, -1, -1);
+		}
+		return new FileState(true, true, file.length(), file.lastModified());
+	}
+
+}
-- 
2.7.4