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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.annotation;
import com.yahoo.document.DataType;
import com.yahoo.document.datatypes.FieldValue;
/**
* A data type describing a field value having a reference to an annotation of a given type.
*
* @author Einar M R Rosenvinge
*/
public class AnnotationReferenceDataType extends DataType {
private AnnotationType aType;
/**
* Creates an AnnotationReferenceDataType with a generated id.
*
* @param aType the annotation type that AnnotationRefs shall refer to
*/
public AnnotationReferenceDataType(AnnotationType aType) {
super("annotationreference<" + ((aType == null) ? "" : aType.getName()) + ">", 0);
setAnnotationType(aType);
}
/**
* Creates an AnnotationReferenceDataType with a given id.
*
* @param aType the annotation type that AnnotationRefs shall refer to
* @param id the id to use
*/
public AnnotationReferenceDataType(AnnotationType aType, int id) {
super("annotationreference<" + ((aType == null) ? "" : aType.getName()) + ">", id);
this.aType = aType;
}
/**
* Creates an AnnotationReferenceDataType. WARNING! Do not use!
*/
protected AnnotationReferenceDataType() {
super("annotationreference<>", 0);
}
private int createId() {
//TODO: This should be Java's hashCode(), since all other data types use it, and using something else here will probably lead to collisions
return getName().toLowerCase().hashCode();
}
@Override
public FieldValue createFieldValue() {
return new AnnotationReference(this);
}
@Override
public Class getValueClass() {
return AnnotationReference.class;
}
@Override
public boolean isValueCompatible(FieldValue value) {
if (!(value instanceof AnnotationReference)) {
return false;
}
AnnotationReference reference = (AnnotationReference) value;
if (equals(reference.getDataType())) {
return true;
}
return false;
}
/**
* Returns the annotation type of this AnnotationReferenceDataType.
*
* @return the annotation type of this AnnotationReferenceDataType.
*/
public AnnotationType getAnnotationType() {
return aType;
}
/**
* Sets the annotation type that this AnnotationReferenceDataType points to. WARNING! Do not use.
* @param type the annotation type of this AnnotationReferenceDataType.
*/
protected void setAnnotationType(AnnotationType type) {
this.aType = type;
setId(createId());
}
}
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