/*
    * Copyright 2011 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php
    *
   * 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.kuali.rice.core.api.criteria;
  
  import org.apache.commons.lang.builder.EqualsBuilder;
  import org.apache.commons.lang.builder.HashCodeBuilder;
  import org.apache.commons.lang.builder.ToStringBuilder;
  import org.kuali.rice.core.api.mo.ModelBuilder;
  import org.kuali.rice.core.api.mo.ModelObjectComplete;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  public final class GenericQueryResults<T> implements QueryResults<T>, ModelObjectComplete{
  
  	private final List<T> results;
  	private final Integer totalRowCount;
  	private final boolean moreResultsAvailable;
  	
  	private GenericQueryResults(Builder<T> builder) {
  		this.results = builder.getResults() != null ? Collections.unmodifiableList(new ArrayList<T>(builder.getResults())) : Collections.<T>emptyList();
  		this.totalRowCount = builder.getTotalRowCount();
  		this.moreResultsAvailable = builder.isMoreResultsAvailable();
  	}
  
  	@Override
  	public List<T> getResults() {
  		return results;
  	}
  	
  	@Override
  	public Integer getTotalRowCount() {
  		return totalRowCount;
  	}
  
  	@Override
  	public boolean isMoreResultsAvailable() {
  		return moreResultsAvailable;
  	}
  
      @Override
  	public int hashCode() {
  		return HashCodeBuilder.reflectionHashCode(this);
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		return EqualsBuilder.reflectionEquals(obj, this);
  	}
  
  	@Override
  	public String toString() {
  		return ToStringBuilder.reflectionToString(this);
  	}
  
  	public static final class Builder<T> implements ModelBuilder, QueryResults<T>, Serializable {
  
  		private List<T> results;
  		private Integer totalRowCount;
  		private boolean moreResultsAvailable;
  
          public static <T> Builder create() {
              return new Builder<T>();
          }
  
  		private Builder() {
  			this.results = new ArrayList<T>();
  			this.moreResultsAvailable = false;
  		}
  
          @Override
  		public GenericQueryResults<T> build() {
  			return new GenericQueryResults<T>(this);
  		}
  
  		public List<T> getResults() {
  			return this.results;
  		}
  
  		public void setResults(List<T> results) {
  			if (results == null) {
                  throw new IllegalArgumentException("results is null");
              }
  
             this.results = Collections.unmodifiableList(new ArrayList<T>(results));
 		}
 
 		public Integer getTotalRowCount() {
 			return this.totalRowCount;
 		}
 
 		public void setTotalRowCount(Integer totalRowCount) {
 			if (totalRowCount != null && totalRowCount < 0) {
                 throw new IllegalArgumentException("totalRowCount < 0");
             }
 
             this.totalRowCount = totalRowCount;
 		}
 
 		public boolean isMoreResultsAvailable() {
 			return this.moreResultsAvailable;
 		}
 
 		public void setMoreResultsAvailable(boolean moreResultsAvailable) {
 			this.moreResultsAvailable = moreResultsAvailable;
 		}
 	}
 }