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 * must also contain a copy of this document.
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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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 * without prior written permission of Intalio, Inc. For written permission, please contact
 * info@exolab.org.
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 * 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
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 * 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
 *
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 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id$
 */
package org.exolab.castor.builder;

import java.util.Hashtable;

import org.castor.xml.JavaNaming;
import org.exolab.castor.xml.schema.ComplexType;
import org.exolab.castor.xml.schema.ElementDecl;
import org.exolab.castor.xml.schema.Group;
import org.exolab.castor.xml.schema.ModelGroup;
import org.exolab.castor.xml.schema.Structure;

/***
 * A simple class used for creating class names for unnamed Groups in XML Schema.
 *
 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
 * @version $Revision$ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $
 */
public final class GroupNaming {

  /**
   * A HashTable of HashTables that keeps track of group names for each package.
   */
  private Hashtable<String, Hashtable<Group, String>> _packageGroupNames = null;

  /**
   * JavaNaming to be used.
   * 
   * @since 1.1.3
   */
  private JavaNaming _javaNaming;


  /**
   * Creates a new GroupNaming.
   * 
   * @param javaNaming the {@link JavaNaming} to be used
   */
  public GroupNaming(final JavaNaming javaNaming) {
    _packageGroupNames = new Hashtable<String, Hashtable<Group, String>>();
    // JavaNaming was introduced @since 1.1.3
    _javaNaming = javaNaming;
  } // -- GroupNaming

  /**
   * Returns the qualified group name for a given Group instance and a package name; null if there
   * isn't one already.
   *
   * @param group A Group instance
   * @param packageName A package name
   * @return The fully qualified group name for the Group instance/package name combination
   */
  private String getGroupName(final Group group, final String packageName) {
    Hashtable<Group, String> groupNames = _packageGroupNames.get(packageName);
    if (groupNames == null) {
      return null;
    }
    return groupNames.get(group);
  }

  /**
   * Sets the qualified group name for a given Group instance and package name.
   *
   * @param group A Group instance
   * @param packageName A package name
   * @param name The fully qualified group name for the Group instance/package name combination
   */
  private void putGroupName(final Group group, final String packageName, final String name) {
    Hashtable<Group, String> groupNames = _packageGroupNames.get(packageName);
    if (groupNames == null) {
      groupNames = new Hashtable<Group, String>();
      _packageGroupNames.put(packageName, groupNames);
    }
    groupNames.put(group, name);
  }

  /**
   * Checks whether for a given group and package name combination an entry already exists.
   *
   * @param packageName A package name
   * @param name A group name.
   * @return True if a mapping already exists
   */
  private boolean containsGroupName(final String packageName, final String name) {
    Hashtable<Group, String> groupNames = _packageGroupNames.get(packageName);
    if (groupNames == null) {
      return false;
    }
    return groupNames.contains(name);
  }

  /**
   * Creates a class name for the given Group. A null value will be returned if a name cannot be
   * created for the group.
   *
   * @param group the group to create a class name for
   * @param packageName the package name for this group
   * @return the class name for the given Group.
   */
  public String createClassName(final Group group, final String packageName) {
    String name = group.getName();
    if (name != null) {
      return _javaNaming.toJavaClassName(name);
    }
    name = getGroupName(group, packageName);
    if (name != null) {
      return name;
    }

    Structure parent = group.getParent();
    if (parent == null) {
      return null;
    }

    boolean addOrder = true;
    switch (parent.getStructureType()) {
      case Structure.GROUP:
        name = createClassName((Group) parent, packageName);
        break;
      case Structure.MODELGROUP:
        name = ((ModelGroup) parent).getName();
        name = _javaNaming.toJavaClassName(name);
        addOrder = false;
        break;
      case Structure.COMPLEX_TYPE:
        name = getClassName((ComplexType) parent);
        addOrder = false;
        break;
      default:
        break;
    }

    if (name != null) {
      if (addOrder) {
        String order = group.getOrder().toString();
        name += _javaNaming.toJavaClassName(order);
      }

      int count = 2;
      String tmpName = name;
      while (containsGroupName(packageName, name)) {
        name = tmpName + count;
        ++count;
      }
      putGroupName(group, packageName, name);
    }
    return name;
  } // -- createClassName

  /**
   * Returns the class name for the given ComplexType.
   * <p>
   * If the ComplexType instance is named, simply return the name of the ComplexType.
   * <p>
   * If it is not named (in other words, if it is an anonymous ComplexType definition), check for
   * the name of the containing element (definition).
   *
   * @param complexType the ComplexType for which to return a class name
   * @return the class name for the given ComplexType
   */
  private String getClassName(final ComplexType complexType) {
    // -- if complexType has name, simply return it
    String name = complexType.getName();
    if (name != null) {
      return _javaNaming.toJavaClassName(name);
    }

    // -- otherwise get name of containing element
    Structure parent = complexType.getParent();
    if (parent != null && parent.getStructureType() == Structure.ELEMENT) {
      name = ((ElementDecl) parent).getName();
    }

    if (name != null) {
      name = _javaNaming.toJavaClassName(name);
    }
    return name;
  } // -- getName

} // -- class GroupNaming
