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package sun.reflect.generics.reflectiveObjects;

import sun.reflect.generics.tree.FieldTypeSignature;

import java.lang.reflect.MalformedParameterizedTypeException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.Arrays;
import java.util.StringJoiner;
import java.util.Objects;

Implementing class for ParameterizedType interface.
/** Implementing class for ParameterizedType interface. */
public class ParameterizedTypeImpl implements ParameterizedType { private final Type[] actualTypeArguments; private final Class<?> rawType; private final Type ownerType; private ParameterizedTypeImpl(Class<?> rawType, Type[] actualTypeArguments, Type ownerType) { this.actualTypeArguments = actualTypeArguments; this.rawType = rawType; this.ownerType = (ownerType != null) ? ownerType : rawType.getDeclaringClass(); validateConstructorArguments(); } private void validateConstructorArguments() { TypeVariable<?>[] formals = rawType.getTypeParameters(); // check correct arity of actual type args if (formals.length != actualTypeArguments.length){ throw new MalformedParameterizedTypeException(); } for (int i = 0; i < actualTypeArguments.length; i++) { // check actuals against formals' bounds } }
Static factory. Given a (generic) class, actual type arguments and an owner type, creates a parameterized type. This class can be instantiated with a raw type that does not represent a generic type, provided the list of actual type arguments is empty. If the ownerType argument is null, the declaring class of the raw type is used as the owner type.

This method throws a MalformedParameterizedTypeException under the following circumstances: If the number of actual type arguments (i.e., the size of the array typeArgs) does not correspond to the number of formal type arguments. If any of the actual type arguments is not an instance of the bounds on the corresponding formal.

Params:
  • rawType – the Class representing the generic type declaration being instantiated
  • actualTypeArguments – a (possibly empty) array of types representing the actual type arguments to the parameterized type
  • ownerType – the enclosing type, if known.
Throws:
Returns:An instance of ParameterizedType
/** * Static factory. Given a (generic) class, actual type arguments * and an owner type, creates a parameterized type. * This class can be instantiated with a raw type that does not * represent a generic type, provided the list of actual type * arguments is empty. * If the ownerType argument is null, the declaring class of the * raw type is used as the owner type. * <p> This method throws a MalformedParameterizedTypeException * under the following circumstances: * If the number of actual type arguments (i.e., the size of the * array {@code typeArgs}) does not correspond to the number of * formal type arguments. * If any of the actual type arguments is not an instance of the * bounds on the corresponding formal. * @param rawType the Class representing the generic type declaration being * instantiated * @param actualTypeArguments a (possibly empty) array of types * representing the actual type arguments to the parameterized type * @param ownerType the enclosing type, if known. * @return An instance of {@code ParameterizedType} * @throws MalformedParameterizedTypeException if the instantiation * is invalid */
public static ParameterizedTypeImpl make(Class<?> rawType, Type[] actualTypeArguments, Type ownerType) { return new ParameterizedTypeImpl(rawType, actualTypeArguments, ownerType); }
Returns an array of Type objects representing the actual type arguments to this type.

Note that in some cases, the returned array be empty. This can occur if this type represents a non-parameterized type nested within a parameterized type.

Throws:
Returns:an array of Type objects representing the actual type arguments to this type
Since:1.5
/** * Returns an array of {@code Type} objects representing the actual type * arguments to this type. * * <p>Note that in some cases, the returned array be empty. This can occur * if this type represents a non-parameterized type nested within * a parameterized type. * * @return an array of {@code Type} objects representing the actual type * arguments to this type * @throws TypeNotPresentException if any of the * actual type arguments refers to a non-existent type declaration * @throws MalformedParameterizedTypeException if any of the * actual type parameters refer to a parameterized type that cannot * be instantiated for any reason * @since 1.5 */
public Type[] getActualTypeArguments() { return actualTypeArguments.clone(); }
Returns the Type object representing the class or interface that declared this type.
Returns:the Type object representing the class or interface that declared this type
/** * Returns the {@code Type} object representing the class or interface * that declared this type. * * @return the {@code Type} object representing the class or interface * that declared this type */
public Class<?> getRawType() { return rawType; }
Returns a Type object representing the type that this type is a member of. For example, if this type is O<T>.I<S>, return a representation of O<T>.

If this type is a top-level type, null is returned.

Throws:
Returns:a Type object representing the type that this type is a member of. If this type is a top-level type, null is returned
/** * Returns a {@code Type} object representing the type that this type * is a member of. For example, if this type is {@code O<T>.I<S>}, * return a representation of {@code O<T>}. * * <p>If this type is a top-level type, {@code null} is returned. * * @return a {@code Type} object representing the type that * this type is a member of. If this type is a top-level type, * {@code null} is returned * @throws TypeNotPresentException if the owner type * refers to a non-existent type declaration * @throws MalformedParameterizedTypeException if the owner type * refers to a parameterized type that cannot be instantiated * for any reason * */
public Type getOwnerType() { return ownerType; } /* * From the JavaDoc for java.lang.reflect.ParameterizedType * "Instances of classes that implement this interface must * implement an equals() method that equates any two instances * that share the same generic type declaration and have equal * type parameters." */ @Override public boolean equals(Object o) { if (o instanceof ParameterizedType) { // Check that information is equivalent ParameterizedType that = (ParameterizedType) o; if (this == that) return true; Type thatOwner = that.getOwnerType(); Type thatRawType = that.getRawType(); if (false) { // Debugging boolean ownerEquality = (ownerType == null ? thatOwner == null : ownerType.equals(thatOwner)); boolean rawEquality = (rawType == null ? thatRawType == null : rawType.equals(thatRawType)); boolean typeArgEquality = Arrays.equals(actualTypeArguments, // avoid clone that.getActualTypeArguments()); for (Type t : actualTypeArguments) { System.out.printf("\t\t%s%s%n", t, t.getClass()); } System.out.printf("\towner %s\traw %s\ttypeArg %s%n", ownerEquality, rawEquality, typeArgEquality); return ownerEquality && rawEquality && typeArgEquality; } return Objects.equals(ownerType, thatOwner) && Objects.equals(rawType, thatRawType) && Arrays.equals(actualTypeArguments, // avoid clone that.getActualTypeArguments()); } else return false; } @Override public int hashCode() { return Arrays.hashCode(actualTypeArguments) ^ Objects.hashCode(ownerType) ^ Objects.hashCode(rawType); } public String toString() { StringBuilder sb = new StringBuilder(); if (ownerType != null) { sb.append(ownerType.getTypeName()); sb.append("$"); if (ownerType instanceof ParameterizedTypeImpl) { // Find simple name of nested type by removing the // shared prefix with owner. sb.append(rawType.getName().replace( ((ParameterizedTypeImpl)ownerType).rawType.getName() + "$", "")); } else sb.append(rawType.getSimpleName()); } else sb.append(rawType.getName()); if (actualTypeArguments != null) { StringJoiner sj = new StringJoiner(", ", "<", ">"); sj.setEmptyValue(""); for(Type t: actualTypeArguments) { sj.add(t.getTypeName()); } sb.append(sj.toString()); } return sb.toString(); } }