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;
  
  public abstract class UniOperatorFilter extends OSGiFilter {
  
      private final OSGiFilter subFilter;
  
      public UniOperatorFilter(OSGiFilter subFilter) {
          this.subFilter = subFilter;
      }
  
      protected abstract char operator();
  
      @Override
      public void append(StringBuffer builder) {
          builder.append("(");
          builder.append(operator());
          builder.append(subFilter.toString());
          builder.append(")");
      }
  
      public OSGiFilter getSubFilter() {
          return subFilter;
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          result = prime * result + ((subFilter == null) ? 0 : subFilter.hashCode());
          return result;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (!(obj instanceof UniOperatorFilter)) {
              return false;
          }
          UniOperatorFilter other = (UniOperatorFilter) obj;
          return subFilter == null ? other.subFilter == null : subFilter.equals(other.subFilter);
      }
  }
  