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package org.jvnet.tiger_types;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.MalformedParameterizedTypeException;
import java.util.Arrays;
/**
* {@link ParameterizedType} implementation.
*/
final class ParameterizedTypeImpl implements ParameterizedType {
private Type[] actualTypeArguments;
private Class<?> rawType;
private Type ownerType;
ParameterizedTypeImpl(Class<?> rawType,
Type[] actualTypeArguments,
Type ownerType) {
this.actualTypeArguments = actualTypeArguments;
this.rawType = rawType;
if (ownerType != null) {
this.ownerType = ownerType;
} else {
this.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
}
}
public Type[] getActualTypeArguments() {
return actualTypeArguments.clone();
}
public Class<?> getRawType() {
return rawType;
}
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
(ownerType == null ?
thatOwner == null :
ownerType.equals(thatOwner)) &&
(rawType == null ?
thatRawType == null :
rawType.equals(thatRawType)) &&
Arrays.equals(actualTypeArguments, // avoid clone
that.getActualTypeArguments());
} else
return false;
}
@Override
public int hashCode() {
return Arrays.hashCode(actualTypeArguments) ^
(ownerType == null ? 0 : ownerType.hashCode()) ^
(rawType == null ? 0 : rawType.hashCode());
}
public String toString() {
StringBuilder sb = new StringBuilder();
if (ownerType != null) {
if (ownerType instanceof Class)
sb.append(((Class) ownerType).getName());
else
sb.append(ownerType.toString());
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.getName());
} else
sb.append(rawType.getName());
if (actualTypeArguments != null &&
actualTypeArguments.length > 0) {
sb.append("<");
boolean first = true;
for (Type t : actualTypeArguments) {
if (!first)
sb.append(", ");
if (t instanceof Class)
sb.append(((Class) t).getName());
else
sb.append(t.toString());
first = false;
}
sb.append(">");
}
return sb.toString();
}
}