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TypeUtils detects variations of ParameterizedType/GenericArrayType assignability as well

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This commit is contained in:
Juergen Hoeller
2009-02-13 12:17:48 +00:00
parent d8651a88ec
commit fe462916b1
2 changed files with 80 additions and 12 deletions
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49
org.springframework.core/src/main/java/org/springframework/util/TypeUtils.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2007 the original author or authors.
* Copyright 2002-2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
package org.springframework.util;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
@@ -34,20 +35,54 @@ public abstract class TypeUtils {
* Check if the right-hand side type may be assigned to the left-hand side
* type following the Java generics rules.
* @param lhsType the target type
* @param rhsType the value type that should be assigned to the target type
* @param rhsType the value type that should be assigned to the target type
* @return true if rhs is assignable to lhs
*/
public static boolean isAssignable(Type lhsType, Type rhsType) {
Assert.notNull(lhsType, "Left-hand side type must not be null");
Assert.notNull(rhsType, "Right-hand side type must not be null");
if (lhsType.equals(rhsType)) {
if (lhsType.equals(rhsType) || lhsType.equals(Object.class)) {
return true;
}
if (lhsType instanceof Class && rhsType instanceof Class) {
return ClassUtils.isAssignable((Class) lhsType, (Class) rhsType);
if (lhsType instanceof Class) {
Class lhsClass = (Class) lhsType;
if (rhsType instanceof Class) {
return ClassUtils.isAssignable(lhsClass, (Class) rhsType);
}
else if (rhsType instanceof ParameterizedType){
Type rhsRaw = ((ParameterizedType) rhsType).getRawType();
if (rhsRaw instanceof Class) {
return ClassUtils.isAssignable(lhsClass, (Class) rhsRaw);
}
}
else if (lhsClass.isArray() && rhsType instanceof GenericArrayType){
Type rhsComponent = ((GenericArrayType) rhsType).getGenericComponentType();
return isAssignable(lhsClass.getComponentType(), rhsComponent);
}
}
if (lhsType instanceof ParameterizedType && rhsType instanceof ParameterizedType) {
return isAssignable((ParameterizedType) lhsType, (ParameterizedType) rhsType);
if (lhsType instanceof ParameterizedType) {
if (rhsType instanceof Class) {
Type lhsRaw = ((ParameterizedType) lhsType).getRawType();
if (lhsRaw instanceof Class) {
return ClassUtils.isAssignable((Class) lhsRaw, (Class) rhsType);
}
}
else if (rhsType instanceof ParameterizedType) {
return isAssignable((ParameterizedType) lhsType, (ParameterizedType) rhsType);
}
}
if (lhsType instanceof GenericArrayType) {
Type lhsComponent = ((GenericArrayType) lhsType).getGenericComponentType();
if (rhsType instanceof Class) {
Class rhsClass = (Class) rhsType;
if (rhsClass.isArray()) {
return isAssignable(lhsComponent, rhsClass.getComponentType());
}
}
else if (rhsType instanceof GenericArrayType) {
Type rhsComponent = ((GenericArrayType) rhsType).getGenericComponentType();
return isAssignable(lhsComponent, rhsComponent);
}
}
if (lhsType instanceof WildcardType) {
return isAssignable((WildcardType) lhsType, rhsType);