1 files changed, 96 insertions, 0 deletions
diff --git a/jimfs/src/main/java/com/google/common/jimfs/PathMatchers.java b/jimfs/src/main/java/com/google/common/jimfs/PathMatchers.java
new file mode 100644
index 0000000..38ba45a
--- /dev/null
+++ b/jimfs/src/main/java/com/google/common/jimfs/PathMatchers.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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 com.google.common.jimfs;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Ascii;
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableSet;
+import java.nio.file.FileSystem;
+import java.nio.file.Path;
+import java.nio.file.PathMatcher;
+import java.util.regex.Pattern;
+
+/**
+ * {@link PathMatcher} factory for any file system.
+ *
+ * @author Colin Decker
+ */
+final class PathMatchers {
+
+  private PathMatchers() {}
+
+  /**
+   * Gets a {@link PathMatcher} for the given syntax and pattern as specified by {@link
+   * FileSystem#getPathMatcher}. The {@code separators} string contains the path name element
+   * separators (one character each) recognized by the file system. For a glob-syntax path matcher,
+   * any of the given separators will be recognized as a separator in the pattern, and any of them
+   * will be matched as a separator when checking a path.
+   */
+  // TODO(cgdecker): Should I be just canonicalizing separators rather than matching any separator?
+  // Perhaps so, assuming Path always canonicalizes its separators
+  public static PathMatcher getPathMatcher(
+      String syntaxAndPattern, String separators, ImmutableSet<PathNormalization> normalizations) {
+    int syntaxSeparator = syntaxAndPattern.indexOf(':');
+    checkArgument(
+        syntaxSeparator > 0, "Must be of the form 'syntax:pattern': %s", syntaxAndPattern);
+
+    String syntax = Ascii.toLowerCase(syntaxAndPattern.substring(0, syntaxSeparator));
+    String pattern = syntaxAndPattern.substring(syntaxSeparator + 1);
+
+    switch (syntax) {
+      case "glob":
+        pattern = GlobToRegex.toRegex(pattern, separators);
+        // fall through
+      case "regex":
+        return fromRegex(pattern, normalizations);
+      default:
+        throw new UnsupportedOperationException("Invalid syntax: " + syntaxAndPattern);
+    }
+  }
+
+  private static PathMatcher fromRegex(String regex, Iterable<PathNormalization> normalizations) {
+    return new RegexPathMatcher(PathNormalization.compilePattern(regex, normalizations));
+  }
+
+  /**
+   * {@code PathMatcher} that matches the {@code toString()} form of a {@code Path} against a regex
+   * {@code Pattern}.
+   */
+  @VisibleForTesting
+  static final class RegexPathMatcher implements PathMatcher {
+
+    private final Pattern pattern;
+
+    private RegexPathMatcher(Pattern pattern) {
+      this.pattern = checkNotNull(pattern);
+    }
+
+    @Override
+    public boolean matches(Path path) {
+      return pattern.matcher(path.toString()).matches();
+    }
+
+    @Override
+    public String toString() {
+      return MoreObjects.toStringHelper(this).addValue(pattern).toString();
+    }
+  }
+}