content: /*****************************************************************
   *   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
   *
   *    https://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 org.apache.cayenne.modeler.util.path;
  
  import java.io.File;
  
  public class LongPathTrimmer implements PathTrimmer {
  
      private static final String PATH_SEPARATOR = File.separator;
      private static final int PATH_LENGTH_THRESHOLD = 8;
  
      private String[] splitPath(String path) {
          return path.split(PATH_SEPARATOR);
      }
  
      private String joinPath(String[] components) {
          if(components.length == 0) {
              return "";
          }
          StringBuilder sb = new StringBuilder(components[0]);
          for(int i=1; i<components.length; i++) {
              sb.append(PATH_SEPARATOR);
              sb.append(components[i]);
          }
          return sb.toString();
      }
  
      @Override
      public String trim(String path) {
          String[] components = splitPath(path);
          if(components.length <= PATH_LENGTH_THRESHOLD + 1) {
              return path;
          }
          String[] strippedComponents = new String[PATH_LENGTH_THRESHOLD + 1];
          int half = PATH_LENGTH_THRESHOLD / 2;
          int end = components.length - half;
          int idx = 0;
          boolean trimAdded = false;
          for(int i=0; i<components.length; i++) {
              if(i < half || i >= end) {
                  strippedComponents[idx++] = components[i];
              } else if(!trimAdded) {
                  strippedComponents[idx++] = "...";
                  trimAdded = true;
              }
          }
          return joinPath(strippedComponents);
      }
  }
  