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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.repository.graph;
  
  /**
   * Represents an edge label used in Atlas.
   * The format of an Atlas edge label is EDGE_LABEL_PREFIX<<typeName>>.<<attributeName>>[.mapKey]
   *
   */
  public class AtlasEdgeLabel {
      private final String typeName;
      private final String attributeName;
      private final String mapKey;
      private final String edgeLabel;
      private final String qualifiedMapKey;
      private final String qualifiedAttributeName;
  
      public AtlasEdgeLabel(String edgeLabel) {
          String   labelWithoutPrefix = edgeLabel.substring(GraphHelper.EDGE_LABEL_PREFIX.length());
          String[] fields             = labelWithoutPrefix.split("\\.", 3);
  
          if (fields.length < 2 || fields.length > 3) {
              throw new IllegalArgumentException("Invalid edge label " + edgeLabel + ": expected 2 or 3 label components but found " + fields.length);
          }
  
          typeName      = fields[0];
          attributeName = fields[1];
  
          if (fields.length == 3) {
              mapKey                 = fields[2];
              qualifiedMapKey        = labelWithoutPrefix;
              qualifiedAttributeName = typeName + '.' + attributeName;
          } else {
              mapKey          = null;
              qualifiedMapKey = null;
              qualifiedAttributeName = labelWithoutPrefix;
          }
  
          this.edgeLabel = edgeLabel;
      }
  
      public String getTypeName() {
          return typeName;
      }
  
      public String getAttributeName() {
          return attributeName;
      }
  
      public String getMapKey() {
          return mapKey;
      }
  
      public String getEdgeLabel() {
          return edgeLabel;
      }
  
      public String getQualifiedMapKey() {
          return qualifiedMapKey;
      }
  
      public String getQualifiedAttributeName() {
          return qualifiedAttributeName;
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder();
  
          sb.append('(').append("typeName: ").append(typeName);
          sb.append(", attributeName: ").append(attributeName);
  
          if (mapKey != null) {
              sb.append(", mapKey: ").append(mapKey);
              sb.append(", qualifiedMapKey: ").append(qualifiedMapKey);
          }
          sb.append(", edgeLabel: ").append(edgeLabel).append(')');
  
          return sb.toString();
      }
  }
  