PrefixList.java

/*
 * Licensed to 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 tachyon;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.Validate;

import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;

/**
 * Prefix list is used by PinList and WhiteList to do file filtering.
 */
public class PrefixList {
  private final List<String> LIST;

  public PrefixList(List<String> prefixList) {
    if (prefixList == null) {
      LIST = new ArrayList<String>(0);
    } else {
      LIST = prefixList;
    }
  }

  public PrefixList(String prefixes, String separator) {
    Validate.notNull(separator);
    LIST = new ArrayList<String>(0);
    if (prefixes != null && !prefixes.trim().isEmpty()) {
      String[] candidates = prefixes.trim().split(separator);
      for (String prefix : candidates) {
        String trimmed = prefix.trim();
        if (!trimmed.isEmpty()) {
          LIST.add(trimmed);
        }
      }
    }
  }

  public List<String> getList() {
    return ImmutableList.copyOf(LIST);
  }

  public boolean inList(String path) {
    if (Strings.isNullOrEmpty(path)) {
      return false;
    }

    for (int k = 0; k < LIST.size(); k ++) {
      if (path.startsWith(LIST.get(k))) {
        return true;
      }
    }

    return false;
  }

  public boolean outList(String path) {
    return !inList(path);
  }

  /**
   * Print out all prefixes separated by ";".
   * 
   * @return the string representation like "a;b/c"
   */
  @Override
  public String toString() {
    StringBuilder s = new StringBuilder();
    for (String prefix : LIST) {
      s.append(prefix).append(";");
    }
    return s.toString();
  }
}