/
ParameterizedTypeInformation.java
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/
ParameterizedTypeInformation.java
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/*
* Copyright 2011 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.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.util;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.core.GenericTypeResolver;
/**
* Base class for all types that include parameterization of some kind. Crucial as we have to take note of the parent
* class we will have to resolve generic parameters against.
*
* @author Oliver Gierke
*/
class ParameterizedTypeInformation<T> extends ParentTypeAwareTypeInformation<T> {
private final ParameterizedType type;
private TypeInformation<?> componentType;
/**
* Creates a new {@link ParameterizedTypeInformation} for the given {@link Type} and parent {@link TypeDiscoverer}.
*
* @param type must not be {@literal null}
* @param parent must not be {@literal null}
*/
public ParameterizedTypeInformation(ParameterizedType type, TypeDiscoverer<?> parent) {
super(type, parent, null);
this.type = type;
}
/*
* (non-Javadoc)
* @see org.springframework.data.util.TypeDiscoverer#getMapValueType()
*/
@Override
public TypeInformation<?> getMapValueType() {
if (Map.class.isAssignableFrom(getType())) {
Type[] arguments = type.getActualTypeArguments();
if (arguments.length > 1) {
return createInfo(arguments[1]);
}
}
Class<?> rawType = getType();
Set<Type> supertypes = new HashSet<Type>();
supertypes.add(rawType.getGenericSuperclass());
supertypes.addAll(Arrays.asList(rawType.getGenericInterfaces()));
for (Type supertype : supertypes) {
Class<?> rawSuperType = GenericTypeResolver.resolveType(supertype, getTypeVariableMap());
if (Map.class.isAssignableFrom(rawSuperType)) {
ParameterizedType parameterizedSupertype = (ParameterizedType) supertype;
Type[] arguments = parameterizedSupertype.getActualTypeArguments();
return createInfo(arguments[1]);
}
}
return super.getMapValueType();
}
/*
* (non-Javadoc)
* @see org.springframework.data.util.TypeDiscoverer#getTypeParameters()
*/
@Override
public List<TypeInformation<?>> getTypeArguments() {
List<TypeInformation<?>> result = new ArrayList<TypeInformation<?>>();
for (Type argument : type.getActualTypeArguments()) {
result.add(createInfo(argument));
}
return result;
}
/*
* (non-Javadoc)
* @see org.springframework.data.util.TypeDiscoverer#isAssignableFrom(org.springframework.data.util.TypeInformation)
*/
@Override
public boolean isAssignableFrom(TypeInformation<?> target) {
if (this.equals(target)) {
return true;
}
Class<T> rawType = getType();
Class<?> rawTargetType = target.getType();
if (!rawType.isAssignableFrom(rawTargetType)) {
return false;
}
TypeInformation<?> otherTypeInformation = rawType.equals(rawTargetType) ? target : target
.getSuperTypeInformation(rawType);
List<TypeInformation<?>> myParameters = getTypeArguments();
List<TypeInformation<?>> typeParameters = otherTypeInformation.getTypeArguments();
if (myParameters.size() != typeParameters.size()) {
return false;
}
for (int i = 0; i < myParameters.size(); i++) {
if (!myParameters.get(i).isAssignableFrom(typeParameters.get(i))) {
return false;
}
}
return true;
}
/*
* (non-Javadoc)
* @see org.springframework.data.util.TypeDiscoverer#getComponentType()
*/
@Override
public TypeInformation<?> getComponentType() {
if (componentType == null) {
this.componentType = createInfo(type.getActualTypeArguments()[0]);
}
return this.componentType;
}
/*
* (non-Javadoc)
* @see org.springframework.data.util.ParentTypeAwareTypeInformation#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ParameterizedTypeInformation)) {
return false;
}
ParameterizedTypeInformation<?> that = (ParameterizedTypeInformation<?>) obj;
if (this.isResolvedCompletely() && that.isResolvedCompletely()) {
return this.type.equals(that.type);
}
return super.equals(obj);
}
/*
* (non-Javadoc)
* @see org.springframework.data.util.ParentTypeAwareTypeInformation#hashCode()
*/
@Override
public int hashCode() {
return super.hashCode() + (isResolvedCompletely() ? this.type.hashCode() : 0);
}
private boolean isResolvedCompletely() {
Type[] types = type.getActualTypeArguments();
if (types.length == 0) {
return false;
}
for (Type type : types) {
TypeInformation<?> info = createInfo(type);
if (info instanceof ParameterizedTypeInformation) {
if (!((ParameterizedTypeInformation<?>) info).isResolvedCompletely()) {
return false;
}
}
if (!(info instanceof ClassTypeInformation)) {
return false;
}
}
return true;
}
}