práctica 3, falta la última parte

es/um/redes/nanoFiles/util/FileDatabase.java

@@ -0,0 +1,43 @@
+package es.um.redes.nanoFiles.util;
+
+import java.io.File;
+import java.util.Map;
+
+/**
+ * @author rtitos
+ * 
+ *         Utility class acting as database of local files shared by this peer.
+ */
+
+public class FileDatabase {
+
+	private Map<String, FileInfo> files;
+
+	public FileDatabase(String sharedFolder) {
+		File theDir = new File(sharedFolder);
+		if (!theDir.exists()) {
+			theDir.mkdirs();
+		}
+		this.files = FileInfo.loadFileMapFromFolder(new File(sharedFolder));
+		if (files.size() == 0) {
+			System.err.println("*WARNING: No files found in folder " + sharedFolder);
+		}
+	}
+
+	public FileInfo[] getFiles() {
+		FileInfo[] fileinfoarray = new FileInfo[files.size()];
+		int numFiles = 0;
+		for (FileInfo f : files.values()) {
+			fileinfoarray[numFiles++] = f;
+		}
+		return fileinfoarray;
+	}
+
+	public String lookupFilePath(String fileHash) {
+		FileInfo f = files.get(fileHash);
+		if (f != null) {
+			return f.filePath;
+		}
+		return null;
+	}
+}