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.ivy.osgi.filter;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public abstract class MultiOperatorFilter extends OSGiFilter {
  
      private List<OSGiFilter> subFilters = new ArrayList<>();
  
      public MultiOperatorFilter() {
          // default constructor
      }
  
      public MultiOperatorFilter(OSGiFilter[] filters) {
          for (OSGiFilter filter : filters) {
              add(filter);
          }
      }
  
      protected abstract char operator();
  
      @Override
      public void append(StringBuffer builder) {
          builder.append('(');
          builder.append(operator());
          for (OSGiFilter filter : subFilters) {
              filter.append(builder);
          }
          builder.append(')');
      }
  
      public void add(OSGiFilter subFilter2) {
          subFilters.add(subFilter2);
      }
  
      public List<OSGiFilter> getSubFilters() {
          return subFilters;
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          for (OSGiFilter subFilter : subFilters) {
              result = prime * result + ((subFilter == null) ? 0 : subFilter.hashCode());
          }
          return result;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null || !(obj instanceof MultiOperatorFilter)) {
              return false;
          }
          MultiOperatorFilter other = (MultiOperatorFilter) obj;
          return subFilters == null ? other.subFilters == null
                  : other.subFilters != null && subFilters.size() == other.subFilters.size()
                  && subFilters.containsAll(other.subFilters);
      }
  }
  