Initial message bus implementation

[controller.git] / opendaylight / md-sal / messagebus-impl / src / main / java / org / opendaylight / controller / messagebus / app / impl / Util.java

diff --git a/opendaylight/md-sal/messagebus-impl/src/main/java/org/opendaylight/controller/messagebus/app/impl/Util.java b/opendaylight/md-sal/messagebus-impl/src/main/java/org/opendaylight/controller/messagebus/app/impl/Util.java
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+/*
+ * 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.messagebus.app.impl;
+
+import com.google.common.util.concurrent.Futures;
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.Future;
+import java.util.regex.Pattern;
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
+import org.opendaylight.controller.sal.common.util.Rpcs;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.opendaylight.yangtools.yang.common.QName;
+import org.opendaylight.yangtools.yang.common.RpcError;
+import org.opendaylight.yangtools.yang.common.RpcResult;
+
+public final class Util {
+    private static final MessageDigest messageDigestTemplate = getDigestInstance();
+
+    private static MessageDigest getDigestInstance() {
+        try {
+            return MessageDigest.getInstance("MD5");
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("Unable to get MD5 instance");
+        }
+    }
+
+    public static String md5String(final String inputString) {
+
+        try {
+            MessageDigest md = (MessageDigest)messageDigestTemplate.clone();
+            md.update(inputString.getBytes("UTF-8"), 0, inputString.length());
+            return new BigInteger(1, md.digest()).toString(16);
+        } catch (Exception e) {
+            throw new RuntimeException("Unable to get MD5 instance");
+        }
+    }
+
+    public static <T> Future<RpcResult<T>> resultFor(final T output) {
+        RpcResult<T> result = Rpcs.getRpcResult(true, output, Collections.<RpcError>emptyList());
+        return Futures.immediateFuture(result);
+    }
+
+    /**
+     * Extracts affected node from data change event.
+     * @param event
+     * @return
+     */
+    public static Node getAffectedNode(final AsyncDataChangeEvent<InstanceIdentifier<?>, DataObject> event) {
+        // TODO: expect listener method to be called even when change impact node
+        // TODO: test with change.getCreatedData()
+        for (Map.Entry<InstanceIdentifier<?>, DataObject> changeEntry : event.getUpdatedData().entrySet()) {
+            if (isNode(changeEntry)) {
+                return (Node) changeEntry.getValue();
+            }
+        }
+
+        return null;
+    }
+
+    private static boolean isNode(final Map.Entry<InstanceIdentifier<?>, DataObject> changeEntry )  {
+        return Node.class.equals(changeEntry.getKey().getTargetType());
+    }
+
+    /**
+     * Method filters qnames based on wildcard strings
+     *
+     * @param availableQnames
+     * @param patterh matching pattern
+     * @return list of filtered qnames
+     */
+    public static List<QName> expandQname(final List<QName> availableQnames, final Pattern pattern) {
+        List<QName> matchingQnames = new ArrayList<>();
+
+        for (QName qname : availableQnames) {
+            String namespace = qname.getNamespace().toString();
+            if (pattern.matcher(namespace).matches()) {
+                matchingQnames.add(qname);
+            }
+        }
+
+        return matchingQnames;
+    }
+
+    /**
+     * CREDIT to http://www.rgagnon.com/javadetails/java-0515.html
+     * @param wildcard
+     * @return
+     */
+    static String wildcardToRegex(final String wildcard){
+        StringBuffer s = new StringBuffer(wildcard.length());
+        s.append('^');
+        for (char c : wildcard.toCharArray()) {
+            switch(c) {
+                case '*':
+                    s.append(".*");
+                    break;
+                case '?':
+                    s.append('.');
+                    break;
+                // escape special regexp-characters
+                case '(':
+                case ')':
+                case '[':
+                case ']':
+                case '$':
+                case '^':
+                case '.':
+                case '{':
+                case '}':
+                case '|':
+                case '\\':
+                    s.append("\\");
+                    s.append(c);
+                    break;
+                default:
+                    s.append(c);
+                    break;
+            }
+        }
+        s.append('$');
+        return s.toString();
+    }
+}