content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software, please see the
   * company website: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.db;
  
  import java.util.Collections;
  import java.util.List;
  
  import com.google.common.collect.Lists;
  
  /**
   * A query fragment which aggregates the results from a list of other query fragments.<p>
   *
   * @since 8.0.0
   */
  public class CmsCompositeQueryFragment implements I_CmsQueryFragment {
  
      /** The list of query fragments which should be aggregated. */
      private List<I_CmsQueryFragment> m_fragments = Lists.newArrayList();
  
      /** The prefix string. */
      private String m_prefix;
  
      /** The separator string which should be inserted between the SQL of each constituent query fragment. */
      private String m_separator;
  
      /** The suffix string. */
      private String m_suffix;
  
      /**
       * Adds a new query fragment.<p>
       *
       * @param node the query fragment
       */
      public void add(I_CmsQueryFragment node) {
  
          m_fragments.add(node);
      }
  
      /**
       * Returns the wrapped query fragments.<p>
       *
       * @return a list of query fragments
       */
      public List<I_CmsQueryFragment> getNodes() {
  
          return m_fragments;
      }
  
      /**
       * Sets the prefix string (will be inserted before the other fragments).<p>
       *
       * @param prefix the prefix string
       */
      public void setPrefix(String prefix) {
  
          m_prefix = prefix;
      }
  
      /**
       * Sets the separator which should be inserted between the constituent query fragments.<p>
       *
       * @param separator the separator string
       */
      public void setSeparator(String separator) {
  
          m_separator = separator;
      }
  
      /**
       * Sets the suffix string (will be inserted after the other fragments).<p>
       *
       * @param suffix the suffix string
       */
      public void setSuffix(String suffix) {
  
          m_suffix = suffix;
      }
  
      /**
       * @see org.opencms.db.I_CmsQueryFragment#visit(org.opencms.db.CmsStatementBuilder)
       */
      public void visit(CmsStatementBuilder builder) {
  
          boolean first = true;
          if (m_prefix != null) {
              builder.add(m_prefix);
          }
          for (I_CmsQueryFragment node : m_fragments) {
              if (!first && (m_separator != null)) {
                  builder.add(m_separator, Collections.<Object> emptyList());
              }
              node.visit(builder);
              first = false;
  
          }
          if (m_prefix != null) {
              builder.add(m_suffix);
          }
      }
  }
  