From bcb7f6d4dd86f0c0ff6839c4bc44a8ac7f834419 Mon Sep 17 00:00:00 2001
From: Diego <diegolparra@gmail.com>
Date: Mon, 22 Dec 2014 17:35:11 -0300
Subject: = core: modified version of GlobPathFilter and improve
 GlobPahFilterSpec

---
 .../src/main/java/kamon/util/GlobPathFilter.java   | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 kamon-core/src/main/java/kamon/util/GlobPathFilter.java

(limited to 'kamon-core/src/main/java/kamon/util')

diff --git a/kamon-core/src/main/java/kamon/util/GlobPathFilter.java b/kamon-core/src/main/java/kamon/util/GlobPathFilter.java
new file mode 100644
index 00000000..0c7b999c
--- /dev/null
+++ b/kamon-core/src/main/java/kamon/util/GlobPathFilter.java
@@ -0,0 +1,110 @@
+/*
+ * =========================================================================================
+ * Copyright  2013-2014 the kamon project <http://kamon.io/>
+ *
+ * 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.
+ * =========================================================================================
+ */
+
+package kamon.util;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Default implementation of PathFilter.  Uses glob based includes and excludes to determine whether to export.
+ *
+ * @author John E. Bailey
+ * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
+ */
+public final class GlobPathFilter  {
+    private static final Pattern GLOB_PATTERN = Pattern.compile("(\\*\\*?)|(\\?)|(\\\\.)|(/+)|([^*?]+)");
+
+    private final String glob;
+    private final Pattern pattern;
+
+    /**
+     * Construct a new instance.
+     *
+     * @param glob the path glob to match
+     */
+    public GlobPathFilter(final String glob) {
+        pattern = getGlobPattern(glob);
+        this.glob = glob;
+    }
+
+    /**
+     * Determine whether a path should be accepted.
+     *
+     * @param path the path to check
+     * @return true if the path should be accepted, false if not
+     */
+    public boolean accept(final String path) {
+        return pattern.matcher(path).matches();
+    }
+
+    /**
+     * Get a regular expression pattern which accept any path names which match the given glob.  The glob patterns
+     * function similarly to {@code ant} file patterns.  Valid metacharacters in the glob pattern include:
+     * <ul>
+     * <li><code>"\"</code> - escape the next character (treat it literally, even if it is itself a recognized metacharacter)</li>
+     * <li><code>"?"</code> - match any non-slash character</li>
+     * <li><code>"*"</code> - match zero or more non-slash characters</li>
+     * <li><code>"**"</code> - match zero or more characters, including slashes</li>
+     * <li><code>"/"</code> - match one or more slash characters.  Consecutive {@code /} characters are collapsed down into one.</li>
+     * </ul>
+     * In addition, any glob pattern matches all subdirectories thereof.  A glob pattern ending in {@code /} is equivalent
+     * to a glob pattern ending in <code>/**</code> in that the named directory is not itself included in the glob.
+     * <p/>
+     * <b>See also:</b> <a href="http://ant.apache.org/manual/dirtasks.html#patterns">"Patterns" in the Ant Manual</a>
+     *
+     * @param glob the glob to match
+     *
+     * @return the pattern
+     */
+    private static Pattern getGlobPattern(final String glob) {
+        StringBuilder patternBuilder = new StringBuilder();
+        final Matcher m = GLOB_PATTERN.matcher(glob);
+        boolean lastWasSlash = false;
+        while (m.find()) {
+            lastWasSlash = false;
+            String grp;
+            if ((grp = m.group(1)) != null) {
+                // match a * or **
+                if (grp.length() == 2) {
+                    // it's a *workers are able to process multiple metrics*
+                    patternBuilder.append(".*");
+                } else {
+                    // it's a *
+                    patternBuilder.append("[^/]*");
+                }
+            } else if ((grp = m.group(2)) != null) {
+                // match a '?' glob pattern; any non-slash character
+                patternBuilder.append("[^/]");
+            } else if ((grp = m.group(3)) != null) {
+                // backslash-escaped value
+                patternBuilder.append(Pattern.quote(m.group().substring(1)));
+            } else if ((grp = m.group(4)) != null) {
+                // match any number of / chars
+                patternBuilder.append("/+");
+                lastWasSlash = true;
+            } else {
+                // some other string
+                patternBuilder.append(Pattern.quote(m.group()));
+            }
+        }
+        if (lastWasSlash) {
+            // ends in /, append **
+            patternBuilder.append(".*");
+        }
+        return Pattern.compile(patternBuilder.toString());
+    }
+}
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