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/*
 * The MIT License
 * Copyright (c) 2012 Microsoft Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package microsoft.exchange.webservices.data.property.complex;

import microsoft.exchange.webservices.data.attribute.EditorBrowsable;
import microsoft.exchange.webservices.data.core.EwsServiceXmlReader;
import microsoft.exchange.webservices.data.core.EwsServiceXmlWriter;
import microsoft.exchange.webservices.data.core.EwsUtilities;
import microsoft.exchange.webservices.data.core.XmlAttributeNames;
import microsoft.exchange.webservices.data.core.XmlElementNames;
import microsoft.exchange.webservices.data.core.enumeration.attribute.EditorBrowsableState;
import microsoft.exchange.webservices.data.core.enumeration.property.UserConfigurationDictionaryObjectType;
import microsoft.exchange.webservices.data.core.enumeration.misc.XmlNamespace;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceLocalException;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceXmlSerializationException;
import microsoft.exchange.webservices.data.misc.OutParam;
import microsoft.exchange.webservices.data.util.DateTimeUtils;
import org.apache.commons.codec.binary.Base64;

import javax.xml.stream.XMLStreamException;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Represents a user configuration's Dictionary property.
 */
@EditorBrowsable(state = EditorBrowsableState.Never)
public final class UserConfigurationDictionary extends ComplexProperty
    implements Iterable {

  // TODO: Consider implementing IsDirty mechanism in ComplexProperty.

  /**
   * The dictionary.
   */
  private Map dictionary;

  /**
   * The is dirty.
   */
  private boolean isDirty = false;

  /**
   * Initializes a new instance of "UserConfigurationDictionary" class.
   */
  public UserConfigurationDictionary() {
    super();
    this.dictionary = new HashMap();
  }

  /**
   * Gets the element with the specified key.
   *
   * @param key The key of the element to get or set.
   * @return The element with the specified key.
   */
  public Object getElements(Object key) {
    return this.dictionary.get(key);
  }

  /**
   * Sets the element with the specified key.
   *
   * @param key   The key of the element to get or set
   * @param value the value
   * @throws Exception the exception
   */
  public void setElements(Object key, Object value) throws Exception {
    this.validateEntry(key, value);
    this.dictionary.put(key, value);
    this.changed();
  }

  /**
   * Adds an element with the provided key and value to the user configuration
   * dictionary.
   *
   * @param key   The object to use as the key of the element to add.
   * @param value The object to use as the value of the element to add.
   * @throws Exception the exception
   */
  public void addElement(Object key, Object value) throws Exception {
    this.validateEntry(key, value);
    this.dictionary.put(key, value);
    this.changed();
  }

  /**
   * Determines whether the user configuration dictionary contains an element
   * with the specified key.
   *
   * @param key The key to locate in the user configuration dictionary.
   * @return true if the user configuration dictionary contains an element
   * with the key; otherwise false.
   */
  public boolean containsKey(Object key) {
    return this.dictionary.containsKey(key);
  }

  /**
   * Removes the element with the specified key from the user configuration
   * dictionary.
   *
   * @param key The key of the element to remove.
   * @return true if the element is successfully removed; otherwise false.
   */
  public boolean remove(Object key) {
    boolean isRemoved = false;
    if (key != null) {
      this.dictionary.remove(key);
      isRemoved = true;
    }

    if (isRemoved) {
      this.changed();
    }

    return isRemoved;
  }

  /**
   * Gets the value associated with the specified key.
   *
   * @param key   The key whose value to get.
   * @param value When this method returns, the value associated with the
   *              specified key, if the key is found; otherwise, null.
   * @return true if the user configuration dictionary contains the key;
   * otherwise false.
   */
  public boolean tryGetValue(Object key, OutParam value) {
    if (this.dictionary.containsKey(key)) {
      value.setParam(this.dictionary.get(key));
      return true;
    } else {
      value.setParam(null);
      return false;
    }

  }

  /**
   * Gets the number of elements in the user configuration dictionary.
   *
   * @return the count
   */
  public int getCount() {
    return this.dictionary.size();
  }

  /**
   * Removes all item from the user configuration dictionary.
   */
  public void clear() {
    if (this.dictionary.size() != 0) {
      this.dictionary.clear();

      this.changed();
    }
  }

  /**
   * Gets the enumerator.
   *
   * @return the enumerator
   */

  /**
   * Returns an enumerator that iterates through
   * the user configuration dictionary.
   *
   * @return An IEnumerator that can be used
   * to iterate through the user configuration dictionary.
   */
  public Iterator getEnumerator() {
    return (this.dictionary.values().iterator());
  }

  /**
   * Gets the isDirty flag.
   *
   * @return the checks if is dirty
   */
  public boolean getIsDirty() {
    return this.isDirty;
  }

  /**
   * Sets the isDirty flag.
   *
   * @param value the new checks if is dirty
   */
  public void setIsDirty(boolean value) {
    this.isDirty = value;
  }

  /**
   * Instance was changed.
   */
  @Override public void changed() {
    super.changed();
    this.isDirty = true;
  }

  /**
   * Writes elements to XML.
   *
   * @param writer accepts EwsServiceXmlWriter
   * @throws XMLStreamException the XML stream exception
   * @throws ServiceXmlSerializationException the service xml serialization exception
   */
  @Override
  public void writeElementsToXml(EwsServiceXmlWriter writer)
      throws XMLStreamException, ServiceXmlSerializationException {
    EwsUtilities.ewsAssert(writer != null, "UserConfigurationDictionary.WriteElementsToXml", "writer is null");
    Iterator> it = this.dictionary.entrySet()
        .iterator();
    while (it.hasNext()) {
      Entry dictionaryEntry = it.next();
      writer.writeStartElement(XmlNamespace.Types,
          XmlElementNames.DictionaryEntry);
      this.writeObjectToXml(writer, XmlElementNames.DictionaryKey,
          dictionaryEntry.getKey());
      this.writeObjectToXml(writer, XmlElementNames.DictionaryValue,
          dictionaryEntry.getValue());
      writer.writeEndElement();
    }
  }

  /**
   * Writes a dictionary object (key or value) to Xml.
   *
   * @param writer           the writer
   * @param xmlElementName   the Xml element name
   * @param dictionaryObject the object to write
   * @throws XMLStreamException the XML stream exception
   * @throws ServiceXmlSerializationException the service xml serialization exception
   */
  private void writeObjectToXml(EwsServiceXmlWriter writer,
      String xmlElementName, Object dictionaryObject)
      throws XMLStreamException, ServiceXmlSerializationException {
    EwsUtilities.ewsAssert(writer != null, "UserConfigurationDictionary.WriteObjectToXml", "writer is null");
    EwsUtilities.ewsAssert(xmlElementName != null, "UserConfigurationDictionary.WriteObjectToXml",
                           "xmlElementName is null");
    writer.writeStartElement(XmlNamespace.Types, xmlElementName);

    if (dictionaryObject == null) {
      EwsUtilities.ewsAssert((!xmlElementName.equals(XmlElementNames.DictionaryKey)),
                             "UserConfigurationDictionary.WriteObjectToXml", "Key is null");

      writer.writeAttributeValue(
          EwsUtilities.EwsXmlSchemaInstanceNamespacePrefix,
          XmlAttributeNames.Nil, EwsUtilities.XSTrue);
    } else {
      this.writeObjectValueToXml(writer, dictionaryObject);
    }

    writer.writeEndElement();
  }

  /**
   * Writes a dictionary Object's value to Xml.
   *
   * @param writer           The writer.
   * @param dictionaryObject The dictionary object to write. 

   *                         Object values are either:  

   *                         an array of strings, an array of bytes (which will be encoded into base64) 

   *                         or a single value. Single values can be: 

   *                         - datetime, boolean, byte, int, long, string
   * @throws XMLStreamException the XML stream exception
   * @throws ServiceXmlSerializationException the service xml serialization exception
   */
  private void writeObjectValueToXml(final EwsServiceXmlWriter writer,
      final Object dictionaryObject) throws XMLStreamException,
      ServiceXmlSerializationException {
    // Preconditions
    if (dictionaryObject == null) {
      throw new NullPointerException("DictionaryObject must not be null");
    }
    if (writer == null) {
      throw new NullPointerException(
          "EwsServiceXmlWriter must not be null");
    }

    // Processing
    final UserConfigurationDictionaryObjectType dictionaryObjectType;
    if (dictionaryObject instanceof String[]) {
      dictionaryObjectType = UserConfigurationDictionaryObjectType.StringArray;
      this.writeEntryTypeToXml(writer, dictionaryObjectType);

      for (String arrayElement : (String[]) dictionaryObject) {
        this.writeEntryValueToXml(writer, arrayElement);
      }
    } else {
      final String valueAsString;
      if (dictionaryObject instanceof String) {
        dictionaryObjectType = UserConfigurationDictionaryObjectType.String;
        valueAsString = String.valueOf(dictionaryObject);
      } else if (dictionaryObject instanceof Boolean) {
        dictionaryObjectType = UserConfigurationDictionaryObjectType.Boolean;
        valueAsString = EwsUtilities
            .boolToXSBool((Boolean) dictionaryObject);
      } else if (dictionaryObject instanceof Byte) {
        dictionaryObjectType = UserConfigurationDictionaryObjectType.Byte;
        valueAsString = String.valueOf(dictionaryObject);
      } else if (dictionaryObject instanceof Date) {
        dictionaryObjectType = UserConfigurationDictionaryObjectType.DateTime;
        valueAsString = writer.getService()
            .convertDateTimeToUniversalDateTimeString(
                (Date) dictionaryObject);
      } else if (dictionaryObject instanceof Integer) {
        // removed unsigned integer because in Java, all types are
        // signed, there are no unsigned versions
        dictionaryObjectType = UserConfigurationDictionaryObjectType.Integer32;
        valueAsString = String.valueOf(dictionaryObject);
      } else if (dictionaryObject instanceof Long) {
        // removed unsigned integer because in Java, all types are
        // signed, there are no unsigned versions
        dictionaryObjectType = UserConfigurationDictionaryObjectType.Integer64;
        valueAsString = String.valueOf(dictionaryObject);
      } else if (dictionaryObject instanceof byte[]) {
        dictionaryObjectType = UserConfigurationDictionaryObjectType.ByteArray;
        valueAsString = Base64.encodeBase64String((byte[]) dictionaryObject);
      } else if (dictionaryObject instanceof Byte[]) {
        dictionaryObjectType = UserConfigurationDictionaryObjectType.ByteArray;

        // cast Byte[] to byte[]
        Byte[] from = (Byte[]) dictionaryObject;
        byte[] to = new byte[from.length];
        for (int currentIndex = 0; currentIndex < from.length; currentIndex++) {
          to[currentIndex] = (byte) from[currentIndex];
        }

        valueAsString = Base64.encodeBase64String(to);
      } else {
        throw new IllegalArgumentException(String.format(
            "Unsupported type: %s", dictionaryObject.getClass()
                .toString()));
      }
      this.writeEntryTypeToXml(writer, dictionaryObjectType);
      this.writeEntryValueToXml(writer, valueAsString);
    }
  }


  /**
   * Writes a dictionary entry type to Xml.
   *
   * @param writer               the writer
   * @param dictionaryObjectType type to write
   * @throws XMLStreamException the XML stream exception
   * @throws ServiceXmlSerializationException the service xml serialization exception
   */
  private void writeEntryTypeToXml(EwsServiceXmlWriter writer,
      UserConfigurationDictionaryObjectType dictionaryObjectType)
      throws XMLStreamException, ServiceXmlSerializationException {
    writer.writeStartElement(XmlNamespace.Types, XmlElementNames.Type);
    writer
        .writeValue(dictionaryObjectType.toString(),
            XmlElementNames.Type);
    writer.writeEndElement();
  }

  /**
   * Writes a dictionary entry value to Xml.
   *
   * @param writer the writer
   * @param value  value to write
   * @throws XMLStreamException the XML stream exception
   * @throws ServiceXmlSerializationException the service xml serialization exception
   */
  private void writeEntryValueToXml(EwsServiceXmlWriter writer, String value)
      throws XMLStreamException, ServiceXmlSerializationException {
    writer.writeStartElement(XmlNamespace.Types, XmlElementNames.Value);

    // While an entry value can't be null, if the entry is an array, an
    // element of the array can be null.
    if (value != null) {
      writer.writeValue(value, XmlElementNames.Value);
    }

    writer.writeEndElement();
  }

  /*
   * (non-Javadoc)
   *
   * @see
   * microsoft.exchange.webservices.ComplexProperty#loadFromXml(microsoft.
   * exchange.webservices.EwsServiceXmlReader,
   * microsoft.exchange.webservices.XmlNamespace, java.lang.String)
   */
  @Override
  /**
   * Loads this dictionary from the specified reader.
   * @param reader The reader.
   * @param xmlNamespace The dictionary's XML namespace.
   * @param xmlElementName Name of the XML element
   * representing the dictionary.
   */ public void loadFromXml(EwsServiceXmlReader reader, XmlNamespace xmlNamespace, String xmlElementName) throws Exception {
    super.loadFromXml(reader, xmlNamespace, xmlElementName);

    this.isDirty = false;
  }

  /*
   * (non-Javadoc)
   *
   * @see
   * microsoft.exchange.webservices.ComplexProperty#tryReadElementFromXml(
   * microsoft.exchange.webservices.EwsServiceXmlReader)
   */
  @Override
  /**
   * Tries to read element from XML.
   * @param reader The reader.
   * @return True if element was read.
   */
  public boolean tryReadElementFromXml(EwsServiceXmlReader reader)
      throws Exception {
    reader.ensureCurrentNodeIsStartElement(this.getNamespace(),
        XmlElementNames.DictionaryEntry);
    this.loadEntry(reader);
    return true;
  }

  /**
   * Loads an entry, consisting of a key value pair, into this dictionary from
   * the specified reader.
   *
   * @param reader The reader.
   * @throws Exception the exception
   */
  private void loadEntry(EwsServiceXmlReader reader) throws Exception {
    EwsUtilities.ewsAssert(reader != null, "UserConfigurationDictionary.LoadEntry", "reader is null");

    Object key;
    Object value = null;

    // Position at DictionaryKey
    reader.readStartElement(this.getNamespace(),
        XmlElementNames.DictionaryKey);

    key = this.getDictionaryObject(reader);

    // Position at DictionaryValue
    reader.readStartElement(this.getNamespace(),
        XmlElementNames.DictionaryValue);

    String nil = reader.readAttributeValue(XmlNamespace.XmlSchemaInstance,
        XmlAttributeNames.Nil);
    boolean hasValue = (nil == null)
        || (!nil.getClass().equals(Boolean.TYPE));
    if (hasValue) {
      value = this.getDictionaryObject(reader);
    }
    this.dictionary.put(key, value);
  }

  /**
   * Extracts a dictionary object (key or entry value) from the specified
   * reader.
   *
   * @param reader The reader.
   * @return Dictionary object.
   * @throws Exception the exception
   */
  private Object getDictionaryObject(EwsServiceXmlReader reader)
      throws Exception {
    EwsUtilities.ewsAssert(reader != null, "UserConfigurationDictionary.loadFromXml", "reader is null");
    UserConfigurationDictionaryObjectType type = this.getObjectType(reader);
    List values = this.getObjectValue(reader, type);
    return this.constructObject(type, values, reader);
  }

  /**
   * Extracts a dictionary object (key or entry value) as a string list from
   * the specified reader.
   *
   * @param reader The reader.
   * @param type   The object type.
   * @return String list representing a dictionary object.
   * @throws Exception the exception
   */
  private List getObjectValue(EwsServiceXmlReader reader,
      UserConfigurationDictionaryObjectType type) throws Exception {
    EwsUtilities.ewsAssert(reader != null, "UserConfigurationDictionary.loadFromXml", "reader is null");

    List values = new ArrayList();

    reader.readStartElement(this.getNamespace(), XmlElementNames.Value);

    do {
      String value = null;

      if (reader.isEmptyElement()) {
        // Only string types can be represented with empty values.
        if (type.equals(UserConfigurationDictionaryObjectType.String)
            || type
            .equals(UserConfigurationDictionaryObjectType.
                StringArray)) {
          value = "";
        } else {
          EwsUtilities
              .ewsAssert(false, "UserConfigurationDictionary." + "GetObjectValue",
                         "Empty element passed for type: " + type.toString());

        }

      } else {
        value = reader.readElementValue();
      }

      values.add(value);
      reader.read(); // Position at next element or
      // DictionaryKey/DictionaryValue end element
    } while (reader.isStartElement(this.getNamespace(),
        XmlElementNames.Value));
    return values;
  }

  /**
   * Extracts the dictionary object (key or entry value) type from the
   * specified reader.
   *
   * @param reader The reader.
   * @return Dictionary object type.
   * @throws Exception the exception
   */
  private UserConfigurationDictionaryObjectType getObjectType(
      EwsServiceXmlReader reader) throws Exception {
    EwsUtilities.ewsAssert(reader != null, "UserConfigurationDictionary.loadFromXml", "reader is null");

    reader.readStartElement(this.getNamespace(), XmlElementNames.Type);

    String type = reader.readElementValue();
    return UserConfigurationDictionaryObjectType.valueOf(type);
  }

  /**
   * Constructs a dictionary object (key or entry value) from the specified
   * type and string list.
   *
   * @param type   Object type to construct.
   * @param value  Value of the dictionary object as a string list
   * @param reader The reader.
   * @return Dictionary object.
   */
  private Object constructObject(UserConfigurationDictionaryObjectType type,
      List value, EwsServiceXmlReader reader) {
    EwsUtilities.ewsAssert(value != null, "UserConfigurationDictionary.ConstructObject", "value is null");
    EwsUtilities
        .ewsAssert((value.size() == 1 || type == UserConfigurationDictionaryObjectType.StringArray),

                   "UserConfigurationDictionary.ConstructObject",
                   "value is array but type is not StringArray");
    EwsUtilities
        .ewsAssert(reader != null, "UserConfigurationDictionary.ConstructObject", "reader is null");

    Object dictionaryObject = null;
    if (type.equals(UserConfigurationDictionaryObjectType.Boolean)) {
      dictionaryObject = Boolean.parseBoolean(value.get(0));
    } else if (type.equals(UserConfigurationDictionaryObjectType.Byte)) {
      dictionaryObject = Byte.parseByte(value.get(0));
    } else if (type.equals(UserConfigurationDictionaryObjectType.ByteArray)) {
      dictionaryObject = Base64.decodeBase64(value.get(0));
    } else if (type.equals(UserConfigurationDictionaryObjectType.DateTime)) {
      Date dateTime = DateTimeUtils.convertDateTimeStringToDate(value.get(0));
      if (dateTime != null) {
        dictionaryObject = dateTime;
      } else {
        EwsUtilities.ewsAssert(false, "UserConfigurationDictionary.ConstructObject", "DateTime is null");
      }
    } else if (type.equals(UserConfigurationDictionaryObjectType.Integer32)) {
      dictionaryObject = Integer.parseInt(value.get(0));
    } else if (type.equals(UserConfigurationDictionaryObjectType.Integer64)) {
      dictionaryObject = Long.parseLong(value.get(0));
    } else if (type.equals(UserConfigurationDictionaryObjectType.String)) {
      dictionaryObject = String.valueOf(value.get(0));
    } else if (type
        .equals(UserConfigurationDictionaryObjectType.StringArray)) {
      dictionaryObject = value.toArray();
    } else if (type
        .equals(UserConfigurationDictionaryObjectType.
            UnsignedInteger32)) {
      dictionaryObject = Integer.parseInt(value.get(0));
    } else if (type
        .equals(UserConfigurationDictionaryObjectType.
            UnsignedInteger64)) {
      dictionaryObject = Long.parseLong(value.get(0));
    } else {
      EwsUtilities.ewsAssert(false, "UserConfigurationDictionary.ConstructObject",
                             "Type not recognized: " + type.toString());
    }

    return dictionaryObject;
  }

  /**
   * Validates the specified key and value.
   *
   * @param key   The key.
   * @param value The diction dictionary entry key.ary entry value.
   * @throws Exception the exception
   */
  private void validateEntry(Object key, Object value) throws Exception {
    this.validateObject(key);
    this.validateObject(value);

  }

  /**
   * Validates the dictionary object (key or entry value).
   *
   * @param dictionaryObject Object to validate.
   * @throws Exception the exception
   */
  private void validateObject(Object dictionaryObject) throws Exception {
    // Keys may not be null but we rely on the internal dictionary to throw
    // if the key is null.
    if (dictionaryObject != null) {
      if (dictionaryObject.getClass().isArray()) {
        int length = Array.getLength(dictionaryObject);
        Class wrapperType = Array.get(dictionaryObject, 0).getClass();
        Object[] newArray = (Object[]) Array.
            newInstance(wrapperType, length);
        for (int i = 0; i < length; i++) {
          newArray[i] = Array.get(dictionaryObject, i);
        }
        this.validateArrayObject(newArray);
      } else {
        this.validateObjectType(dictionaryObject);

      }

    } else {
      throw new NullPointerException();
    }
  }

  /**
   * Validate the array object.
   *
   * @param dictionaryObjectAsArray Object to validate
   * @throws ServiceLocalException the service local exception
   */
  private void validateArrayObject(Object[] dictionaryObjectAsArray)
      throws ServiceLocalException {
    // This logic is based on
    // Microsoft.Exchange.Data.Storage.ConfigurationDictionary.
    // CheckElementSupportedType().
    // if (dictionaryObjectAsArray is string[])

    if (dictionaryObjectAsArray instanceof String[]) {
      if (dictionaryObjectAsArray.length > 0) {
        for (Object arrayElement : dictionaryObjectAsArray) {
          if (arrayElement == null) {
            throw new ServiceLocalException("The array contains at least one null element.");
          }
        }
      } else {
        throw new ServiceLocalException("The array must contain at least one element.");
      }
    } else if (dictionaryObjectAsArray instanceof Byte[]) {
      if (dictionaryObjectAsArray.length <= 0) {
        throw new ServiceLocalException("The array must contain at least one element.");
      }
    } else {
      throw new ServiceLocalException(String.format(
          "Objects of type %s can't be added to the dictionary. The following types are supported: string array, byte array, boolean, byte, DateTime, integer, long, string, unsigned integer, and unsigned long.", dictionaryObjectAsArray
              .getClass()));
    }
  }

  /**
   * Validates the dictionary object type.
   *
   * @param theObject Object to validate.
   * @throws ServiceLocalException the service local exception
   */
  private void validateObjectType(Object theObject) throws ServiceLocalException {
    // This logic is based on
    // Microsoft.Exchange.Data.Storage.ConfigurationDictionary.
    // CheckElementSupportedType().
    boolean isValidType = false;
    if (theObject != null) {
      if (theObject instanceof String ||
          theObject instanceof Boolean ||
          theObject instanceof Byte ||
          theObject instanceof Long ||
          theObject instanceof Date ||
          theObject instanceof Integer) {
        isValidType = true;
      }
    }

    if (!isValidType) {
      throw new ServiceLocalException(
          String.format(
              "Objects of type %s can't be added to the dictionary. The following types are supported: string array, byte array, boolean, byte, DateTime, integer, long, string, unsigned integer, and unsigned long.", (theObject != null ?
              theObject.getClass().toString() : "null")));
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see java.lang.Iterable#iterator()
   */
  @Override
  public Iterator iterator() {
    return this.dictionary.values().iterator();

  }

}
 















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