Example usage for java.lang.reflect TypeVariable getGenericDeclaration

Introduction

In this page you can find the example usage for java.lang.reflect TypeVariable getGenericDeclaration.

Prototype

D getGenericDeclaration();

Source Link

Document

Returns the GenericDeclaration object representing the generic declaration declared for this type variable.

Usage

From source file:GenericsUtil.java

/**
 * Returns all of the {@link TypeVariables}s implemented
 * by the given class.  If none are implemented then an array
 * of zero length is returned./* w w  w .  java 2  s.  com*/
 * @param clazz the class
 * @param genericClazz the generic class or interface to return
 * the TypeVariables from
 * @return an array of TypeVariable
 */
public static TypeVariable<?>[] getGenericTypeParameters(Class<?> clazz, Type genericClazz) {
    List<TypeVariable<?>> vars = new ArrayList<TypeVariable<?>>();

    // add superclass
    for (TypeVariable<?> var : clazz.getSuperclass().getTypeParameters()) {
        if (genericClazz == null || genericClazz.equals(var.getGenericDeclaration())) {
            vars.add(var);
        }
    }

    // add interfaces
    for (Class<?> iface : clazz.getInterfaces()) {
        for (TypeVariable<?> var : iface.getTypeParameters()) {
            if (genericClazz == null || genericClazz.equals(var.getGenericDeclaration())) {
                vars.add(var);
            }
        }
    }

    // return list
    return vars.toArray(new TypeVariable<?>[0]);
}

---

From source file:Main.java

/**
 * Searches for the typevariable definition in the inClass hierarchy.
 * /*  w  ww .  ja  va  2 s .  co m*/
 * @param type
 * @param inClass
 * @return the resolved type or type if unable to resolve it.
 */
public final static Type resolveTypeVariable(TypeVariable<? extends GenericDeclaration> type,
        Class<?> inClass) {
    return resolveTypeVariable(type, genericDeclarationToClass(type.getGenericDeclaration()), inClass);
}

---

From source file:com.autentia.common.util.ClassWithList.java

private static void print(TypeVariable v) {
    System.out.println("Type variable");
    System.out.println("Name: " + v.getName());
    System.out.println("Declaration: " + v.getGenericDeclaration());
    System.out.println("Bounds:");
    for (Type t : v.getBounds()) {
        print(t);/* w  ww  .  j a v  a2 s.  com*/
    }
}

---

From source file:Main.java

final static Type expand(Type type, Class<?> inClass) {
    Type expandedType = null;/*w  ww.  j a v a 2s .  c o m*/
    if (type instanceof TypeVariable) {
        @SuppressWarnings("unchecked")
        // for the moment we assume it is a class, we can later handle ctr and methods
        TypeVariable<GenericDeclaration> tvType = (TypeVariable<GenericDeclaration>) type;
        if (inClass == null)
            inClass = genericDeclarationToClass(tvType.getGenericDeclaration());
        expandedType = resolveTypeVariable(tvType, inClass);
        if (type.equals(expandedType))
            expandedType = tvType.getBounds()[0];
    } else if (type instanceof WildcardType) {
        WildcardType wType = (WildcardType) type;
        expandedType = wType.getUpperBounds().length > 0 ? expand(wType.getUpperBounds()[0], inClass)
                : Object.class;
    } else
        return type;

    return expandedType == null || type.equals(expandedType) ? Object.class : expandedType;
}

---

From source file:eu.stratosphere.api.java.typeutils.TypeExtractor.java

private static TypeInformation<?> findCorrespondingInfo(TypeVariable<?> typeVar, Type type,
        TypeInformation<?> corrInfo) {
    if (type instanceof TypeVariable) {
        TypeVariable<?> variable = (TypeVariable<?>) type;
        if (variable.getName().equals(typeVar.getName())
                && variable.getGenericDeclaration().equals(typeVar.getGenericDeclaration())) {
            return corrInfo;
        }/*w  ww.  ja  va  2s . com*/
    } else if (type instanceof ParameterizedType
            && Tuple.class.isAssignableFrom((Class<?>) ((ParameterizedType) type).getRawType())) {
        ParameterizedType tuple = (ParameterizedType) type;
        Type[] args = tuple.getActualTypeArguments();

        for (int i = 0; i < args.length; i++) {
            TypeInformation<?> info = findCorrespondingInfo(typeVar, args[i],
                    ((TupleTypeInfo<?>) corrInfo).getTypeAt(i));
            if (info != null) {
                return info;
            }
        }
    }
    return null;
}

---

From source file:jp.terasoluna.fw.util.GenericsUtil.java

/**
 * ??<code>Type</code>??//  ww  w  . j  a v a  2  s.  com
 * @param type ????<code>Type</code>
 * @param ancestorTypeList <code>type</code>??? ??????<code>ParameterizedType</code>?
 * @return ?
 * @throws IllegalStateException <code>type</code>? <code>Class</code>???? <code>TypeVariable</code>????? 
 *             <code>type</code>?? ????????? <code>type</code>???<code>Class</code>????
 *             (??)?
 */
protected static Class<? extends Object> resolveTypeVariable(Type type,
        List<ParameterizedType> ancestorTypeList) throws IllegalStateException {

    if (isNotTypeVariable(type)) {
        return getRawClass(type);
    }

    // TypeVariable:?
    TypeVariable<?> targetType = (TypeVariable<?>) type;
    Type actualType = null;
    for (int i = ancestorTypeList.size() - 1; i >= 0; i--) {
        ParameterizedType ancestorType = ancestorTypeList.get(i);

        // ?????
        GenericDeclaration declaration = targetType.getGenericDeclaration();
        if (!(declaration instanceof Class)) {
            throw new IllegalStateException("TypeVariable(" + targetType.getName()
                    + " is not declared at Class " + "(ie. is declared at Method or Constructor)");
        }

        // ?Generics????????
        Class<?> declaredClass = (Class<?>) declaration;
        if (declaredClass != ancestorType.getRawType()) {
            continue;
        }

        // ????????
        // ConcreteAbstractBLogic<R,P> extends AbstractBLogic<P,R>
        // ????????type????
        Type[] parameterTypes = declaredClass.getTypeParameters();
        int index = ArrayUtils.indexOf(parameterTypes, targetType);
        if (index == -1) {
            // ???????????????
            // ??????????
            // ???Generics?API?????????????
            // ?????????
            throw new IllegalStateException("Class(" + declaredClass.getName()
                    + ") does not declare TypeValidable(" + targetType.getName() + ")");
        }
        actualType = ancestorType.getActualTypeArguments()[index];
        if (log.isDebugEnabled()) {
            log.debug("resolved " + targetType.getName() + " -> " + actualType);
        }

        if (isNotTypeVariable(actualType)) {
            return getRawClass(actualType);
        }
        targetType = (TypeVariable<?>) actualType;
    }

    throw new IllegalStateException(
            "Concrete type of Type(" + type + ") was not found in ancestorList(" + ancestorTypeList + ")");
}

---

From source file:eu.stratosphere.api.java.typeutils.TypeExtractor.java

private static Type materializeTypeVariable(ArrayList<Type> typeHierarchy, TypeVariable<?> typeVar) {

    TypeVariable<?> inTypeTypeVar = typeVar;
    // iterate thru hierarchy from top to bottom until type variable gets a class assigned
    for (int i = typeHierarchy.size() - 1; i >= 0; i--) {
        Type curT = typeHierarchy.get(i);

        // parameterized type
        if (curT instanceof ParameterizedType) {
            Class<?> rawType = ((Class<?>) ((ParameterizedType) curT).getRawType());

            for (int paramIndex = 0; paramIndex < rawType.getTypeParameters().length; paramIndex++) {

                TypeVariable<?> curVarOfCurT = rawType.getTypeParameters()[paramIndex];

                // check if variable names match
                if (curVarOfCurT.getName().equals(inTypeTypeVar.getName())
                        && curVarOfCurT.getGenericDeclaration().equals(inTypeTypeVar.getGenericDeclaration())) {
                    Type curVarType = ((ParameterizedType) curT).getActualTypeArguments()[paramIndex];

                    // another type variable level
                    if (curVarType instanceof TypeVariable<?>) {
                        inTypeTypeVar = (TypeVariable<?>) curVarType;
                    }//  w  w w. j a v  a 2s  .  c  o m
                    // class
                    else {
                        return curVarType;
                    }
                }
            }
        }
    }
    // can not be materialized, most likely due to type erasure
    return null;
}

---

From source file:com.autentia.common.util.ClassWithList.java

private <T> void printInfo(List<T> list) throws SecurityException, NoSuchMethodException {

    final TypeVariable<?>[] types = list.getClass().getTypeParameters();

    for (TypeVariable<?> clazz : types) {
        print(clazz);//from   w  w  w  .  j a v  a 2s .  c om

        // ParameterizedType pt = (ParameterizedType)clazz;

        // log.debug(clazz.getName() + " | " + clazz.getGenericDeclaration().getClass().getName());
        //
        for (TypeVariable<?> type : clazz.getGenericDeclaration().getTypeParameters()) {
            ParameterizedType pt = (ParameterizedType) type;
            log.debug(type.getClass().getName());
        }
        //         
        // for (Type type : clazz.getBounds()) {
        // ParameterizedType pt = (ParameterizedType)type;
        // print(pt);
        // log.debug(pt.getOwnerType());
        // log.debug(pt.getRawType());
        // log.debug(pt.getActualTypeArguments());
        // }
    }
}

---

From source file:net.firejack.platform.core.utils.Factory.java

public int getParameterTypeDeclarationIndex(TypeVariable typeVariable) {
    GenericDeclaration genericDeclaration = typeVariable.getGenericDeclaration();
    TypeVariable[] typeVariables = genericDeclaration.getTypeParameters();
    for (int i = 0; i < typeVariables.length; i++) {
        if (typeVariables[i].equals(typeVariable)) {
            return i;
        }// ww w.  ja v a 2  s  . co  m
    }
    throw new IllegalStateException(
            "Argument " + typeVariable.toString() + " is not found in " + genericDeclaration.toString() + ".");
}

---

From source file:net.firejack.platform.core.utils.Factory.java

private FieldInfo getField(Class<?> clazz, Field field) {
    FieldInfo info = null;/*from ww w  .j a  va2s  .com*/
    if (field != null) {
        info = new FieldInfo(field);
        if (field.getGenericType() instanceof TypeVariable) {
            TypeVariable genericType = (TypeVariable) field.getGenericType();
            TypeVariable<?>[] parameters = genericType.getGenericDeclaration().getTypeParameters();
            for (int i = 0; i < parameters.length; i++) {
                if (parameters[i].getName().equals(genericType.getName())) {
                    Class parameterClass = getGenericParameterClass(clazz,
                            (Class) genericType.getGenericDeclaration(), i);
                    info.setType(parameterClass);
                    break;
                }
            }
        }

        if (field.getGenericType() instanceof ParameterizedType) {
            ParameterizedType genericType = (ParameterizedType) field.getGenericType();

            Class<?> arrayType = null;
            if (genericType.getActualTypeArguments()[0] instanceof TypeVariable) {
                TypeVariable genericType1 = (TypeVariable) genericType.getActualTypeArguments()[0];
                TypeVariable<?>[] parameters = genericType1.getGenericDeclaration().getTypeParameters();
                for (int i = 0; i < parameters.length; i++) {
                    if (parameters[i].getName().equals(genericType1.getName())) {
                        arrayType = getGenericParameterClass(clazz,
                                (Class) genericType1.getGenericDeclaration(), i);
                        break;
                    }
                }
            } else {
                arrayType = (Class<?>) genericType.getActualTypeArguments()[0];
            }
            info.setGenericType(arrayType);
        }
    }
    return info;
}

---

• «
• 1
• 2
• »