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/*
* 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();
}
}
}
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