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package sun.reflect.generics.repository;

import java.lang.reflect.TypeVariable;
import sun.reflect.generics.factory.GenericsFactory;
import sun.reflect.generics.tree.FormalTypeParameter;
import sun.reflect.generics.tree.Signature;
import sun.reflect.generics.visitor.Reifier;



This class represents the generic type information for a generic declaration. The code is not dependent on a particular reflective implementation. It is designed to be used unchanged by at least core reflection and JDI.
/** * This class represents the generic type information for a generic * declaration. * The code is not dependent on a particular reflective implementation. * It is designed to be used unchanged by at least core reflection and JDI. */
public abstract class GenericDeclRepository<S extends Signature> extends AbstractRepository<S> {
The formal type parameters. Lazily initialized.
/** The formal type parameters. Lazily initialized. */
private volatile TypeVariable<?>[] typeParameters; protected GenericDeclRepository(String rawSig, GenericsFactory f) { super(rawSig, f); } /* * When queried for a particular piece of type information, the * general pattern is to consult the corresponding cached value. * If the corresponding field is non-null, it is returned. * If not, it is created lazily. This is done by selecting the appropriate * part of the tree and transforming it into a reflective object * using a visitor, which is created by feeding it the factory * with which the repository was created. */
Returns the formal type parameters of this generic declaration.
Returns:the formal type parameters of this generic declaration
/** * Returns the formal type parameters of this generic declaration. * @return the formal type parameters of this generic declaration */
public TypeVariable<?>[] getTypeParameters() { TypeVariable<?>[] value = typeParameters; if (value == null) { value = computeTypeParameters(); typeParameters = value; } return value.clone(); } private TypeVariable<?>[] computeTypeParameters() { // first, extract type parameter subtree(s) from AST FormalTypeParameter[] ftps = getTree().getFormalTypeParameters(); // create array to store reified subtree(s) int length = ftps.length; TypeVariable<?>[] typeParameters = new TypeVariable<?>[length]; // reify all subtrees for (int i = 0; i < length; i++) { Reifier r = getReifier(); // obtain visitor ftps[i].accept(r); // reify subtree // extract result from visitor and store it typeParameters[i] = (TypeVariable<?>) r.getResult(); } return typeParameters; } }