Switch initial config files format to xml and add autodetect adapter for config persi...

[controller.git] / opendaylight / config / config-persister-directory-autodetect-adapter / src / main / java / org / opendaylight / controller / config / persist / storage / directory / autodetect / FileType.java

diff --git a/opendaylight/config/config-persister-directory-autodetect-adapter/src/main/java/org/opendaylight/controller/config/persist/storage/directory/autodetect/FileType.java b/opendaylight/config/config-persister-directory-autodetect-adapter/src/main/java/org/opendaylight/controller/config/persist/storage/directory/autodetect/FileType.java
new file mode 100644 (file)
index 0000000..03654eb
--- /dev/null
+++ b/opendaylight/config/config-persister-directory-autodetect-adapter/src/main/java/org/opendaylight/controller/config/persist/storage/directory/autodetect/FileType.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.config.persist.storage.directory.autodetect;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Charsets;
+import com.google.common.io.Files;
+import org.apache.commons.lang3.StringUtils;
+import org.opendaylight.controller.config.persist.storage.directory.DirectoryPersister;
+import org.opendaylight.controller.config.persist.storage.file.xml.model.ConfigSnapshot;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+
+enum FileType {
+
+    plaintext, xml;
+
+    public static final String XML_STORAGE_FIRST_LINE = "<" + ConfigSnapshot.SNAPSHOT_ROOT_ELEMENT_NAME + ">";
+
+    static FileType getFileType(File file) {
+        String firstLine = readFirstLine(file);
+        if(isPlaintextStorage(firstLine)) {
+            return plaintext;
+        } else if(isXmlStorage(firstLine))
+            return xml;
+
+        throw new IllegalArgumentException("File " + file + " is not of permitted storage type: " + Arrays.toString(FileType.values()));
+    }
+
+    private static boolean isXmlStorage(String firstLine) {
+        return firstLine.startsWith(XML_STORAGE_FIRST_LINE);
+    }
+
+    private static boolean isPlaintextStorage(String firstLine) {
+        return firstLine.startsWith(DirectoryPersister.MODULES_START);
+
+    }
+
+    @VisibleForTesting
+    static String readFirstLine(File file) {
+        FirstLineReadingProcessor callback = new FirstLineReadingProcessor();
+        try {
+            return Files.readLines(file, Charsets.UTF_8, callback);
+        } catch (IOException e) {
+            throw new IllegalArgumentException("Unable to detect file type of file " + file, e);
+        }
+    }
+
+
+    private static class FirstLineReadingProcessor implements com.google.common.io.LineProcessor<String> {
+        private String firstNonBlankLine;
+
+        @Override
+        public boolean processLine(String line) throws IOException {
+            if(isEmptyLine(line)) {
+                return true;
+            } else {
+                firstNonBlankLine = line.trim();
+                return false;
+            }
+        }
+
+        private boolean isEmptyLine(String line) {
+            return StringUtils.isBlank(line);
+        }
+
+        @Override
+        public String getResult() {
+            return firstNonBlankLine;
+        }
+    }
+}