File	Doc	Category	Size	Date	Package
CollectionConstraint.java	API Doc	Example	3265	Sun Dec 14 22:47:40 GMT 2003	oreilly.hcj.datamodeling.constraints

CollectionConstraint

• java.lang.Object
  • ObjectConstraint

Fields Summary
private Class	containedType Holds value of property containedType.

Constructors Summary

public CollectionConstraint(String name, boolean optional, Class dataType, Class containedType) Creates a new instance of CollectionConstraint. param name Contains the name of the constraint. param optional Indicates if the property is optional. param dataType The data type of the object being constrained. param containedType The type of values in the container; null if it doesnt matter. throws IllegalArgumentException If dataType isn't a subclass of Collection. see mirror.datamodel.constraints.Constraint super(name, optional, dataType); if (!Collection.class.isAssignableFrom(dataType)) { throw new IllegalArgumentException("The dataType must be a Collection"); //$NON-NLS-1$ } this.containedType = containedType;

Methods Summary
public java.lang.Class	getContainedType() Getter for property containedType. return Value of property containedType. return this.containedType;
public void	validate(java.lang.Object obj) Validate the given object against the constraint. Checks to make sure the collection is not null if not allowed. If a non-null collection is passed then the members of the collection are tested to be of the type given for the set contents. Passing null for a data type allows all data types. param obj The object to validate. throws ConstraintException If the constraint is violated. if (obj == null) { throw new ConstraintException(ConstraintExceptionType.NULL_NOT_ALLOWED); } if (!getDataType() .isAssignableFrom(obj.getClass())) { throw new ConstraintException(ConstraintExceptionType.INVALID_DATA_TYPE); } Collection coll = (Collection)obj; if (coll.isEmpty()) { if (!isOptional()) { throw new ConstraintException(ConstraintExceptionType.COLLECTION_CANNOT_BE_EMPTY); } } if (containedType != null) { Iterator iter = coll.iterator(); while (iter.hasNext()) { if (!containedType.isAssignableFrom(iter.next().getClass())) { throw new ConstraintException(ConstraintExceptionType.INVALID_COLLECTION_MEMBER); } } }