org.exolab.castor.xml.NodeType Maven / Gradle / Ivy

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 * $Id$
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package org.exolab.castor.xml;

/**
 * The possible node types for an XML field. A field can be represented as an attribute, an element
 * or text content. The default is attribute. This class is essentially a typesafe enumeration and
 * the instances are immutable.
 *
 * @author Assaf Arkin
 * @author Keith Visco
 * @version $Revision$ $Date: 2003-03-03 00:05:44 -0700 (Mon, 03 Mar 2003) $
 */
public final class NodeType {

  /** The attribute type. */
  public static final short ATTRIBUTE = 0;
  /** The element type. */
  public static final short ELEMENT = 1;
  /** The namespace node type. */
  public static final short NAMESPACE = 2;
  /** The text type. */
  public static final short TEXT = 3;
  /**
   * Attribute node type (attribute). This field will appear in the XML document as an
   * element's attribute.
   */
  public static final NodeType Attribute = new NodeType(NodeType.ATTRIBUTE, "attribute");
  /**
   * Element node type (element). This field will appear in the XML document as a contained
   * element.
   */
  public static final NodeType Element = new NodeType(NodeType.ELEMENT, "element");
  /**
   * Namespace node type (namespace). This field will appear in the XML document as a
   * namespace declaration.
   */
  public static final NodeType Namespace = new NodeType(NodeType.NAMESPACE, "namespace");
  /**
   * Content node type (text). This field will appear in the XML document as the element
   * text content.
   */
  public static final NodeType Text = new NodeType(NodeType.TEXT, "text");

  /** The name of this node type as it would appear in a mapping file. */
  private final String _name;
  /** The type of this NodeType. */
  private final short _type;

  /**
   * Private constructor ... creates a new NodeType.
   * 
   * @param type Type of node
   * @param name Name for the node
   */
  private NodeType(final short type, final String name) {
    _type = type;
    _name = name;
  }

  /**
   * Returns the node type from the name. If nodeType is null, return the default node type
   * ({@link #Attribute}). Otherwise returns the named node type mode.
   *
   * @param nodeType The node type name
   * @return The node type
   */
  public static NodeType getNodeType(final String nodeType) {
    if (nodeType == null) {
      return Attribute;
    }
    if (nodeType.equals(Attribute._name)) {
      return Attribute;
    }
    if (nodeType.equals(Namespace._name)) {
      return Namespace;
    }
    if (nodeType.equals(Element._name)) {
      return Element;
    }
    if (nodeType.equals(Text._name)) {
      return Text;
    }
    // We don't expect that this can happen without subclassing.
    throw new IllegalArgumentException("Unrecognized node type");
  }

  /**
   * Returns the type of this NodeType.
   * 
   * @return the type of this NodeType.
   */
  public short getType() {
    return _type;
  }

  /**
   * Returns the name of this NodeType.
   * 
   * @return the name of this NodeType.
   */
  public String toString() {
    return _name;
  }

}