PVariable.java from Texai at Krugle

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/*
 * PVariable.java
 *
 * Created on October 16, 2006, 1:46 AM
 *
 * Description: PVariable is a variable in the Texai logical representation language.
 *
 * Copyright (C) 2006 Stephen L. Reed.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.texai.kb.ejb.entity;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.NamedQuery;
import javax.persistence.OneToOne;
import javax.persistence.Transient;
import org.texai.kb.Constants;

/**
 * Entity class PVariable
 *
 *
 * @author reed
 */
@Entity
@NamedQuery(name=Constants.QUERY_FIND_PVARIABLE_BY_NAME_VALUE,
query="SELECT v FROM PVariable v, PVariableInfo vi WHERE vi.nameValue = :nameValue AND vi.pVariable = v")
public class PVariable extends AbstractTerm {

  /**
   * Determines if a de-serialized file is compatible with this class.
   *
   * Maintainers must change this value if and only if the new version
   * of this class is not compatible with old versions. See Sun docs
   * for <a href=http://java.sun.com/products/jdk/1.1/docs/guide
   * /serialization/spec/version.doc.html> details. </a>
   *
   * Not necessary to include in first version of the class, but
   * included here as a reminder of its importance.
   */
  @Transient
  private static final long serialVersionUID = 1L;

  /** the persistent variable information */
  @OneToOne(fetch=FetchType.LAZY, mappedBy = "pVariable", cascade=CascadeType.ALL)
  private PVariableInfo pVariableInfo;              // NOPMD

  /**
   * Creates a new instance of PVariable
   */
  public PVariable() {
    super();
  }

  /**
   * Creates a new instance of PVariable
   *
   * @param nameValue the name value
   */
  public PVariable(final String nameValue) {
    super();
    //Preconditions
    assert nameValue != null : "nameValue must not be null";
    assert nameValue.length() > 1 : "nameValue must be at least two characters long";
    assert nameValue.charAt(0) == '?' : "variable must have a question mark as its first character " + nameValue;

    pVariableInfo = new PVariableInfo(this, nameValue);
  }

  /**
   * Returns a hash code value for the object.
   *
   * @return a hash code value for this object.
   */
  @Override
  public int hashCode() {
    return getTermId().hashCode();
  }

  /**
   * Determines whether another object is equal to this object.
   *
   * @param object the reference object with which to compare
   * @return <code>true</code> if this object is the same as the argument;
   * <code>false</code> otherwise.
   */
  @Override
  public boolean equals(final Object object) {
    if (!(object instanceof PVariable)) {
      return false;
    }
    final PVariable that = (PVariable) object;
    return this.pVariableInfo.equals(that.pVariableInfo);
  }

  /** Returns a string representation of this object.
   *
   * @return a string representation of this object
   */
  @Override
  public String toString() {
    return pVariableInfo.toString();
  }

  /** Returns a CycL representation of this object.
   *
   * @return a CycL representation of this object
   */
  public String toCycLString() {
    return toString();
  }
  }
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