content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * Licensed 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.alibaba.graphscope.common.ir.tools.config;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Query given labels of a vertex or an edge
   */
  public class LabelConfig {
      public static final LabelConfig DEFAULT = new LabelConfig(true);
  
      private List<String> labels;
      private boolean isAll;
  
      public LabelConfig(boolean isAll) {
          this.isAll = isAll;
          this.labels = new ArrayList<>();
      }
  
      public LabelConfig addLabel(String label) {
          this.labels.add(label);
          return this;
      }
  
      public List<String> getLabels() {
          return Collections.unmodifiableList(labels);
      }
  
      public boolean isAll() {
          return isAll;
      }
  }
  