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## org.apache.cayenne.xml
Class XMLDecoder

    java.lang.Object
      org.apache.cayenne.xml.XMLDecoder

    public class XMLDecoder

extends Object

XMLDecoder is used to decode XML into objects.

Since:
  1.2
Author:
  Kevin J. Menard, Jr.

Constructor Summary
`XMLDecoder()` Default constructor.
`XMLDecoder(ObjectContext objectContext)` Creates an XMLDecoder that will register decoded DataObjects with the specified context.

Method Summary
`Object` | `decode(Reader xml)` Decodes XML wrapped by a Reader into an object.
`Object` | `decode(Reader xml, String mappingUrl)` Decodes XML wrapped by a Reader into an object, using the supplied mapping file to guide the decoding process.
`Boolean` | `decodeBoolean(String xmlTag)` Decodes an XML element to a Boolean.
`Double` | `decodeDouble(String xmlTag)` Decodes an XML element to a Double.
`Float` | `decodeFloat(String xmlTag)` Decodes an XML element to a Float.
`Integer` | `decodeInteger(String xmlTag)` Decodes an XML element to an Integer.
`static List` | `decodeList(Reader xml)` Decodes a list of DataObjects.
`static List` | `decodeList(Reader xml, ObjectContext objectContext)` Decodes a list of DataObjects, registering them the supplied context.
`static List` | `decodeList(Reader xml, String mappingUrl)` Decodes a list of DataObjects using the supplied mapping file to guide the decoding process.
`static List` | `decodeList(Reader xml, String mappingUrl, ObjectContext objectContext)` Decodes a list of DataObjects using the supplied mapping file to guide the decoding process, registering them the supplied context.
`Object` | `decodeObject(String xmlTag)` Decodes an object from XML.
`String` | `decodeString(String xmlTag)` Decodes an XML element to a String.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### XMLDecoder

    public XMLDecoder()

  Default constructor. This will create an XMLDecoder instance that will decode objects from XML, but will not register them with any context.

  See Also:
    `XMLDecoder(ObjectContext)`

### XMLDecoder

    public XMLDecoder(ObjectContext objectContext)

  Creates an XMLDecoder that will register decoded DataObjects with the specified context.

  Parameters:
    `objectContext` - The context to register decoded DataObjects with.

Method Detail

### decodeBoolean

    public Boolean decodeBoolean(String xmlTag)

  Decodes an XML element to a Boolean.

  Parameters:
    `xmlTag` - The tag identifying the element.
  Returns:
    The tag's value.

### decodeDouble

    public Double decodeDouble(String xmlTag)

  Decodes an XML element to a Double.

  Parameters:
    `xmlTag` - The tag identifying the element.
  Returns:
    The tag's value.

### decodeFloat

    public Float decodeFloat(String xmlTag)

  Decodes an XML element to a Float.

  Parameters:
    `xmlTag` - The tag identifying the element.
  Returns:
    The tag's value.

### decodeInteger

    public Integer decodeInteger(String xmlTag)

  Decodes an XML element to an Integer.

  Parameters:
    `xmlTag` - The tag identifying the element.
  Returns:
    The tag's value.

### decodeObject

    public Object decodeObject(String xmlTag)

  Decodes an object from XML.

  Parameters:
    `xmlTag` - The XML tag corresponding to the root of the encoded object.
  Returns:
    The decoded object.

### decodeString

    public String decodeString(String xmlTag)

  Decodes an XML element to a String.

  Parameters:
    `xmlTag` - The tag identifying the element.
  Returns:
    The tag's value.

### decode

    public Object decode(Reader xml)
                  throws CayenneRuntimeException

  Decodes XML wrapped by a Reader into an object.

  Parameters:
    `xml` - Wrapped XML.
  Returns:
    A new instance of the object represented by the XML.
  Throws:
    `CayenneRuntimeException`

### decode

    public Object decode(Reader xml,
                         String mappingUrl)
                  throws CayenneRuntimeException

  Decodes XML wrapped by a Reader into an object, using the supplied mapping file to guide the decoding process.

  Parameters:
    `xml` - Wrapped XML.
    `mappingUrl` - Mapping file describing how the XML elements and object properties correlate.
  Returns:
    A new instance of the object represented by the XML.
  Throws:
    `CayenneRuntimeException`

### decodeList

    public static List decodeList(Reader xml)
                           throws CayenneRuntimeException

  Decodes a list of DataObjects.

  Parameters:
    `xml` - The wrapped XML encoding of the list of DataObjects.
  Returns:
    The list of decoded DataObjects.
  Throws:
    `CayenneRuntimeException`

### decodeList

    public static List decodeList(Reader xml,
                                  ObjectContext objectContext)
                           throws CayenneRuntimeException

  Decodes a list of DataObjects, registering them the supplied context.

  Parameters:
    `xml` - The wrapped XML encoding of the list of DataObjects.
    `objectContext` - The context to register the decode DataObjects with.
  Returns:
    The list of decoded DataObjects.
  Throws:
    `CayenneRuntimeException`

### decodeList

    public static List decodeList(Reader xml,
                                  String mappingUrl)
                           throws CayenneRuntimeException

  Decodes a list of DataObjects using the supplied mapping file to guide the decoding process.

  Parameters:
    `xml` - The wrapped XML encoding of the list of DataObjects.
    `mappingUrl` - Mapping file describing how the XML elements and object properties correlate.
  Returns:
    The list of decoded DataObjects.
  Throws:
    `CayenneRuntimeException`

### decodeList

    public static List decodeList(Reader xml,
                                  String mappingUrl,
                                  ObjectContext objectContext)
                           throws CayenneRuntimeException

  Decodes a list of DataObjects using the supplied mapping file to guide the decoding process, registering them the supplied context.

  Parameters:
    `xml` - The wrapped XML encoding of the list of objects.
    `mappingUrl` - Mapping file describing how the XML elements and object properties correlate.
    `objectContext` - The context to register the decode DataObjects with.
  Returns:
    The list of decoded DataObjects.
  Throws:
    `CayenneRuntimeException`

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