content: /**
   * JBoss, Home of Professional Open Source
   * Copyright Red Hat, Inc., and individual contributors.
   *
   * 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 org.jboss.aerogear.unifiedpush.migrator;
  
  import liquibase.database.Database;
  import liquibase.exception.CustomPreconditionErrorException;
  import liquibase.exception.CustomPreconditionFailedException;
  import liquibase.precondition.CustomPrecondition;
  import liquibase.snapshot.SnapshotGeneratorFactory;
  import liquibase.structure.core.Column;
  import liquibase.structure.core.UniqueConstraint;
  
  public class UniqueConstraintExistsCheck implements CustomPrecondition {
  
      private String tableName;
      private String columnNames;
      private String constraintName;
  
      public void setTableName(String tableName) {
          this.tableName = tableName;
      }
  
      public void setColumnNames(String columnNames) {
          this.columnNames = columnNames;
      }
  
      public void setConstraintName(String constraintName) {
          this.constraintName = constraintName;
      }
  
      @Override
      public void check(Database database) throws CustomPreconditionFailedException, CustomPreconditionErrorException {
          Column column = new Column(this.columnNames);
          UniqueConstraint uniqueConstraint = new UniqueConstraint(this.constraintName, null, null, this.tableName, column);
          boolean markFailed = false;
          try {
              if (!SnapshotGeneratorFactory.getInstance().has(uniqueConstraint, database)) {
                  markFailed = true;
              }
          } catch (Exception e) {
              throw new CustomPreconditionErrorException("custom precondition check errored", e);
          }
  
          if (markFailed) {
              throw new CustomPreconditionFailedException(this.constraintName + " doesn't exist");
          }
      }
  }
  