/*
    * Copyright 2009 the original author or authors.
    * 
    * 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.openehealth.ipf.commons.ihe.xds.core.requests.query;
  
  import lombok.EqualsAndHashCode;
  import lombok.Getter;
  import lombok.ToString;
  
  import javax.xml.bind.annotation.XmlAccessType;
  import javax.xml.bind.annotation.XmlAccessorType;
  import javax.xml.bind.annotation.XmlType;
  import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import static org.apache.commons.lang3.Validate.noNullElements;
  import static org.apache.commons.lang3.Validate.notNull;
  
  /**
   * Represents a list of query parameters.
   * <p>
   * The list allows AND and OR semantics via two levels of lists.
   * The inner lists of parameters have OR semantics. The outer list
   * contains the inner lists and uses AND semantics. E.g. the query
   * list <code>(a, b), (c, d)</code> contains two inner lists and the
   * parameters are evaluated (a OR b) AND (c OR d).
   * @param <T>
   *          The type contained in the list.
   *
   * @author Jens Riemschneider
   */
  @XmlAccessorType(XmlAccessType.FIELD)
  @XmlType(name = "QueryList")
  @EqualsAndHashCode(doNotUseGetters = true)
  @ToString(doNotUseGetters = true)
  public class QueryList<T> implements Serializable {
      private static final long serialVersionUID = -2729640243221349924L;
      
      @XmlJavaTypeAdapter(ListOfListAdapter.class)
      @Getter private List<List<T>> outerList = new ArrayList<>();
  
      /**
       * Constructs a query list.
       */
      public QueryList() {}
  
      /**
       * Constructs a query list using another list.
       * <p>
       * This constructor does not clone the objects in the list.
       * @param other
       *          the other list.
       */
      public QueryList(QueryList<T> other) {
          notNull(other, "other cannot be null");
          noNullElements(other.getOuterList(), "other.getOuterList() cannot contain null elements");
          for (List<T> innerList : other.getOuterList()) {
              noNullElements(innerList, "innerList cannot contain null elements");
              outerList.add(new ArrayList<>(innerList));
          }
      }
  
      /**
       * Constructs a query list.
       * @param singleElement
       *          the only initial element in the list.
       */
      public QueryList(T singleElement) {
          notNull(singleElement, "singleElement cannot be null");
          outerList.add(Collections.singletonList(singleElement));
      }
  
  }