GlobFilePathUtil.java

/**
 * Copyright 2016 StreamSets Inc.
 *
 * Licensed under the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.streamsets.pipeline.lib.util;

import java.nio.file.Path;
import java.nio.file.Paths;

public final class GlobFilePathUtil {
  private GlobFilePathUtil() {}

  public static Path getSubPath(Path path, int from, int to, boolean isPivot) {
    Path subPath = null;
    if (to - from > 0) {
      String baseName = path.getName(from).toString();
      baseName = (from == 0 && isPivot) ? "/" + baseName : baseName;
      String[] extraNames = new String[to - from -1];
      for (int i = from + 1; i < to; i++) {
        extraNames[i - from - 1] = path.getName(i).toString();
      }
      subPath = Paths.get(baseName, extraNames);
    } else if (isPivot) {
      subPath = Paths.get("/");
    }
    return subPath;
  }

  public static Path getPivotPath(Path path) {
    int nameCount = path.getNameCount();
    int wildcardIdx = 0;
    for (; wildcardIdx < nameCount && !hasGlobWildcard(path.getName(wildcardIdx).toString()); wildcardIdx++);
    return getSubPath(path, 0, wildcardIdx, true);
  }

  public static Path getWildcardPath(Path path) {
    int nameCount = path.getNameCount();
    int wildcardIdx = 0;
    for (; wildcardIdx < nameCount && !hasGlobWildcard(path.getName(wildcardIdx).toString()); wildcardIdx++);
    return getSubPath(path, wildcardIdx, nameCount, false);
  }

  public static boolean hasGlobWildcard(String name) {
    boolean escaped = false;
    for (char c: name.toCharArray()) {
      if (c == '\\') {
        escaped = true;
      } else {
        if (!escaped) {
          switch (c) {
            case '*':
            case '?':
            case '{':
            case '[':
              return true;
          }
        } else {
          escaped = false;
        }
      }
    }
    return false;
  }
}