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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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// $Id: SelectList.java 48 2006-07-12 16:15:40Z caron $
/*
 * Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
 *
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
 * and understandings on the user. The user is granted the right, without
 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
 * documentation for any purpose whatsoever, provided that this entire
 * notice appears in all copies of the software, derivative works and
 * supporting documentation.  Further, UCAR requests that the user credit
 * UCAR/Unidata in any publications that result from the use of this
 * software or in any product that includes this software. The names UCAR
 * and/or Unidata, however, may not be used in any advertising or publicity
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package thredds.catalog.query;

import java.util.*;

/**
 * Implementation of a DQC list selector element.
 * A SelectList contains a list of Objects of type ListChoice.
 *
 * @author john caron
 */

public class SelectList extends Selector {
  private ArrayList choices = new ArrayList();
  private SelectList firstNestedSelector = null;

  public SelectList( ) {
    super();
  }

  public SelectList( String label, String id, String template, String required, String multiple) {
    super( label, id, template, required, multiple);
  }

  public void addChoice( ListChoice c) {
    choices.add(c);
    if ((firstNestedSelector == null) && (c.getNestedSelectors().size() > 0))
      firstNestedSelector = (SelectList) c.getNestedSelectors().get(0);
  }

  public boolean hasNestedSelectors() { return firstNestedSelector != null; }
  public SelectList getFirstNestedSelector() { return firstNestedSelector; }

  public ArrayList getChoices() { return choices; }
  public int getSize() { return choices.size(); }

  public boolean equals(Object o) {
    if (this == o) return true;
    if (! (o instanceof SelectList)) return false;
    return o.hashCode() == this.hashCode();
  }

  /** Override Object.hashCode() to implement equals. */
  public int hashCode() {
    if (hashCode == 0) {
      int result = 17;
      if (getTitle() != null)
        result = 37*result + getTitle().hashCode();
      if (getId() != null)
        result = 37*result + getId().hashCode();
      if (getTemplate() != null)
        result = 37*result + getTemplate().hashCode();
      if (isRequired()) result++;
      if (isMultiple()) result++;

      result = 37*result + getChoices().hashCode();
      hashCode = result;
    }
    return hashCode;
  }
  private volatile int hashCode = 0; // Bloch, item 8

}