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## org.apache.cayenne.property
Class BaseClassDescriptor

    java.lang.Object
      org.apache.cayenne.property.BaseClassDescriptor

All Implemented Interfaces:
  ClassDescriptor

Direct Known Subclasses:
  EntityDescriptor

    public abstract class BaseClassDescriptor

extends java.lang.Object
implements ClassDescriptor

A superclass of Cayenne ClassDescriptors. Defines all main bean descriptor parameters and operations. Subclasses would provide methods to initialize the descriptor.

Since:
  1.2
Author:
  Andrus Adamchik

Field Summary
`protected java.util.Map` | `declaredProperties`
`protected java.lang.Class` | `objectClass`
`protected PropertyAccessor` | `persistenceStateProperty`
`protected java.util.Map` | `subclassDescriptors`
`protected ClassDescriptor` | `superclassDescriptor`
`protected java.util.Map` | `valueHolderProperties`

Constructor Summary
`BaseClassDescriptor(ClassDescriptor superclassDescriptor)` Creates an uncompiled BaseClassDescriptor.

Method Summary
`java.lang.Object` | `createObject()` Creates a new instance of a class described by this object.
`Property` | `getDeclaredProperty(java.lang.String propertyName)` Returns a Java Bean property descriptor matching property name or null if no such property is found.
`java.lang.Class` | `getObjectClass()` Returns a bean class mapped by this descriptor.
`java.util.Iterator` | `getProperties()` Returns an Iterator over descriptor properties.
`Property` | `getProperty(java.lang.String propertyName)` Recursively looks up property descriptor in this class descriptor and all superclass descriptors.
`ClassDescriptor` | `getSubclassDescriptor(java.lang.Class objectClass)` Returns the most "specialized" descriptor for a given class.
`ClassDescriptor` | `getSuperclassDescriptor()` Returns a descriptor of the mapped superclass or null if the descriptor's entity sits at the top of inheritance hierarchy.
`void` | `injectValueHolders(java.lang.Object object)` Invokes 'prepareForAccess' of a super descriptor and then invokes 'prepareForAccess' of each declared property.
`boolean` | `isFault(java.lang.Object object)` Returns true if an object is not fully resolved.
`boolean` | `isValid()` Returns true if a descriptor is initialized and ready for operation.
`void` | `shallowMerge(java.lang.Object from, java.lang.Object to)` Copies object properties from one object to another.
`boolean` | `visitProperties(PropertyVisitor visitor)` Passes the visitor to all properties "visit" method, terminating properties walk through in case one of the properties returns false.

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

Field Detail

### superclassDescriptor

    protected ClassDescriptor superclassDescriptor

### objectClass

    protected java.lang.Class objectClass

### declaredProperties

    protected java.util.Map declaredProperties

### valueHolderProperties

    protected java.util.Map valueHolderProperties

### subclassDescriptors

    protected java.util.Map subclassDescriptors

### persistenceStateProperty

    protected PropertyAccessor persistenceStateProperty

Constructor Detail

### BaseClassDescriptor

    public BaseClassDescriptor(ClassDescriptor superclassDescriptor)

  Creates an uncompiled BaseClassDescriptor. Subclasses may add a call to "compile" in the constructor after finishing their initialization.

Method Detail

### isFault

    public boolean isFault(java.lang.Object object)

  Description copied from interface: `ClassDescriptor`
  Returns true if an object is not fully resolved.

  Specified by:
    `isFault` in interface `ClassDescriptor`

### isValid

    public boolean isValid()

  Returns true if a descriptor is initialized and ready for operation.

### getObjectClass

    public java.lang.Class getObjectClass()

  Description copied from interface: `ClassDescriptor`
  Returns a bean class mapped by this descriptor.

  Specified by:
    `getObjectClass` in interface `ClassDescriptor`

### getSubclassDescriptor

    public ClassDescriptor getSubclassDescriptor(java.lang.Class objectClass)

  Description copied from interface: `ClassDescriptor`
  Returns the most "specialized" descriptor for a given class. This method assumes that the following is true:

       this.getObjectClass().isAssignableFrom(objectClass)

  Specified by:
    `getSubclassDescriptor` in interface `ClassDescriptor`

### getProperties

    public java.util.Iterator getProperties()

  Description copied from interface: `ClassDescriptor`
  Returns an Iterator over descriptor properties.

  Specified by:
    `getProperties` in interface `ClassDescriptor`

### getProperty

    public Property getProperty(java.lang.String propertyName)

  Recursively looks up property descriptor in this class descriptor and all superclass descriptors.

  Specified by:
    `getProperty` in interface `ClassDescriptor`

### getDeclaredProperty

    public Property getDeclaredProperty(java.lang.String propertyName)

  Description copied from interface: `ClassDescriptor`
  Returns a Java Bean property descriptor matching property name or null if no such property is found. Lookup DOES NOT including properties from the superclass decsriptors. Returned property maybe any one of simple, value holder or collection properties.

  Specified by:
    `getDeclaredProperty` in interface `ClassDescriptor`

### getSuperclassDescriptor

    public ClassDescriptor getSuperclassDescriptor()

  Returns a descriptor of the mapped superclass or null if the descriptor's entity sits at the top of inheritance hierarchy.

  Specified by:
    `getSuperclassDescriptor` in interface `ClassDescriptor`

### createObject

    public java.lang.Object createObject()

  Creates a new instance of a class described by this object.

  Specified by:
    `createObject` in interface `ClassDescriptor`

### injectValueHolders

    public void injectValueHolders(java.lang.Object object)
                            throws PropertyAccessException

  Invokes 'prepareForAccess' of a super descriptor and then invokes 'prepareForAccess' of each declared property.

  Specified by:
    `injectValueHolders` in interface `ClassDescriptor`
  Throws:
    `PropertyAccessException`

### shallowMerge

    public void shallowMerge(java.lang.Object from,
                             java.lang.Object to)
                      throws PropertyAccessException

  Copies object properties from one object to another. Invokes 'shallowCopy' of a super descriptor and then invokes 'shallowCopy' of each declared property.

  Specified by:
    `shallowMerge` in interface `ClassDescriptor`
  Throws:
    `PropertyAccessException`

### visitProperties

    public boolean visitProperties(PropertyVisitor visitor)

  Description copied from interface: `ClassDescriptor`
  Passes the visitor to all properties "visit" method, terminating properties walk through in case one of the properties returns false. Returns true if all visited properties returned true, false - if one property returned false.

  Specified by:
    `visitProperties` in interface `ClassDescriptor`

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