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/**
* Copyright 2011 ArcBees Inc.
*
* 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 com.gwtplatform.mvp.rebind;
import java.lang.annotation.Annotation;
import java.util.List;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JField;
import com.google.gwt.core.ext.typeinfo.JGenericType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.core.ext.typeinfo.JParameterizedType;
import com.google.gwt.core.ext.typeinfo.JType;
/**
* A helper class that can be used to inspect a class for methods having specific signatures.
*
* @author Philippe Beaudoin
*/
public class ClassInspector {
private final TreeLogger logger;
private final JClassType inspectedClass;
ClassInspector(TreeLogger logger, JClassType inspectedClass) {
this.logger = logger;
this.inspectedClass = inspectedClass;
}
/**
* Inspects the methods to find one that return the specified type. The method can be either in
* the inspected class or any of its parent classes. It can be static or not.
*
* @param returnType The type that should be returned by the method.
* @return The method returning {@code returnType}, or {@code null} if not found.
* @throws UnableToCompleteException If more than one matching method is found.
*/
public JMethod findMethodWithoutParamsReturning(JClassType returnType)
throws UnableToCompleteException {
JMethod result = null;
for (JClassType classType : inspectedClass.getFlattenedSupertypeHierarchy()) {
for (JMethod method : classType.getMethods()) {
JClassType actualReturnType = method.getReturnType().isClassOrInterface();
if (method.getParameters().length == 0
&& actualReturnType != null
&& returnType.isAssignableFrom(actualReturnType)) {
if (result != null) {
logger.log(TreeLogger.ERROR, "The class '" + inspectedClass.getName()
+ "' has more than one method returning " + returnType.getName()
+ " and taking no parameter. This is not allowed.", null);
throw new UnableToCompleteException();
}
result = method;
}
}
}
return result;
}
/**
* Inspects the methods to find one that return the specified parameterized type with the
* specified type as a parameter. The method can be either in the inspected class or any of its
* parent classes. It can be static or not.
*
* @param returnType The parameterized type that should be returned by the method.
* @param returnTypeParameter The type parameter of {@code returnType}.
* @return The method returning {@code returnType}, or {@code null} if not
* found.
* @throws UnableToCompleteException If more than one matching method is found.
*/
public JMethod findMethodWithoutParamsReturning(JGenericType returnType,
JClassType returnTypeParameter) throws UnableToCompleteException {
JMethod result = null;
for (JClassType classType : inspectedClass.getFlattenedSupertypeHierarchy()) {
for (JMethod method : classType.getMethods()) {
JParameterizedType actualReturnType = method.getReturnType().isParameterized();
if (method.getParameters().length == 0
&& actualReturnType != null
&& returnType.isAssignableFrom(actualReturnType)
&& returnTypeParameter.isAssignableFrom(actualReturnType.getTypeArgs()[0])) {
if (result != null) {
logger.log(TreeLogger.ERROR, "The class '" + inspectedClass.getName()
+ "' has more than one method returning " + returnType.getName()
+ "<" + returnTypeParameter.getName() + "> and taking no parameter. "
+ "This is not allowed.", null);
throw new UnableToCompleteException();
}
result = method;
}
}
}
return result;
}
/**
* Inspects the methods to find one that return the specified type and is annotated with the
* specified annotation. The method can be either in the inspected class or any of its parent
* classes. It can be static or not.
*
* @param returnType The type that should be returned by the method.
* @param annotation The annotation that should be present on the method.
* @param failIfAnnotationIsFoundOnWrongMethod If {@code true}, the call will throw an
* {@link UnableToCompleteException} and log an error if the annotation is found on the
* wrong method.
* @return The method returning {@code returnType} and annotated with {@code annotation}, or
* {@code null} if not found.
* @throws UnableToCompleteException If more than one matching method is found, or if the
* annotation is found on another method and {@code failIfAnnotationIsFoundOnWrongMethod}
* is {@code true}.
*/
public JMethod findAnnotatedMethodWithoutParamsReturning(JClassType returnType,
Class annotation,
boolean failIfAnnotationIsFoundOnWrongMethod) throws UnableToCompleteException {
JMethod result = null;
for (JClassType classType : inspectedClass.getFlattenedSupertypeHierarchy()) {
for (JMethod method : classType.getMethods()) {
JClassType actualReturnType = method.getReturnType().isClassOrInterface();
if (method.getAnnotation(annotation) != null) {
if (method.getParameters().length == 0
&& actualReturnType != null
&& returnType.isAssignableFrom(actualReturnType)) {
if (result != null) {
logger.log(TreeLogger.ERROR, "The class '" + inspectedClass.getName()
+ "' has more than one method returning " + returnType.getName()
+ " annotated with '" + annotation.getSimpleName() + "' "
+ " and taking no parameter. This is not allowed.", null);
throw new UnableToCompleteException();
}
result = method;
} else if (failIfAnnotationIsFoundOnWrongMethod) {
logger.log(TreeLogger.ERROR, "The class '" + inspectedClass.getName()
+ "' has method '" + method.getName() + "' annotated with '"
+ annotation.getSimpleName() + "', but the method has the wrong "
+ "signature. It must take 0 parameter and return '"
+ returnType.getName() + "'.", null);
throw new UnableToCompleteException();
}
}
}
}
return result;
}
/**
* Inspects the methods to find one annotated with the specified annotation. The method can be
* either in the inspected class or any of its parent classes. It can be static or not.
*
* @param annotation The annotation that should be present on the method.
* @return The method annotated with {@code annotation}, or {@code null} if not found.
* @throws UnableToCompleteException If more than one matching method is found.
*/
public JMethod findAnnotatedMethod(Class annotation)
throws UnableToCompleteException {
JMethod result = null;
for (JClassType classType : inspectedClass.getFlattenedSupertypeHierarchy()) {
for (JMethod method : classType.getMethods()) {
if (method.getAnnotation(annotation) != null) {
if (result != null) {
logger.log(TreeLogger.ERROR, "The class '" + inspectedClass.getName()
+ "' has more than one method annotated with '"
+ annotation.getSimpleName() + "'. This is not allowed.", null);
throw new UnableToCompleteException();
}
result = method;
}
}
}
return result;
}
/**
* Inspects the class for a method with the given name and taking exactly one parameter of the
* specified type, or of a subtype of that type.
*
* @param methodName The name of the method to look for.
* @param parameterType The type of the unique parameter accepted by that method.
* @return The method, or {@code null} if not found.
*/
public JMethod findMethod(String methodName, JClassType parameterType) {
for (JClassType classType : inspectedClass.getFlattenedSupertypeHierarchy()) {
for (JMethod method : classType.getMethods()) {
if (methodName.equals(method.getName())) {
JType[] parameterTypes = method.getParameterTypes();
if (parameterTypes.length == 1) {
JClassType actualParameterType = parameterTypes[0].isClassOrInterface();
if (actualParameterType != null &&
parameterType.isAssignableFrom(actualParameterType)) {
return method;
}
}
}
}
}
return null;
}
/**
* Collects the methods to find one annotated with the specified annotation. The method can be
* either in the inspected class or any of its parent classes. It can be static or not.
*
* @param annotation The annotation that should be present on the methods.
* @param collection The list in which to collect matching methods.
*/
public void collectAnnotatedMethods(Class annotation,
List collection) {
for (JClassType classType : inspectedClass.getFlattenedSupertypeHierarchy()) {
for (JMethod method : classType.getMethods()) {
if (method.getAnnotation(annotation) != null) {
collection.add(method);
}
}
}
}
/**
* Inspects the fields to collect the ones of the specified parameterized type with the specified
* type as a parameter annotated with the specified annotation. The field can be either in the
* inspected class or any of its parent classes. Only static fields are collected.
*
* @param type The parameterized type of the desired fields.
* @param typeParameter The type parameter of {@code type}.
* @param annotation The annotation that should be present on the field.
* @param collection The list in which to collect matching fields.
* @throws UnableToCompleteException If a field annotated with {@code annotation} is found that
* does not respect the other criteria of the search.
*/
public void collectStaticAnnotatedFields(JClassType type,
JClassType typeParameter, Class annotation,
List collection) throws UnableToCompleteException {
for (JClassType classType : inspectedClass.getFlattenedSupertypeHierarchy()) {
for (JField field : classType.getFields()) {
if (field.getAnnotation(annotation) != null) {
JParameterizedType parameterizedType = field.getType().isParameterized();
if (!field.isStatic()
|| parameterizedType == null
|| !type.isAssignableFrom(parameterizedType)
|| !typeParameter.isAssignableFrom(parameterizedType.getTypeArgs()[0])) {
logger.log(
TreeLogger.ERROR, "Found the annotation @" + annotation.getSimpleName()
+ " on the invalid field '" + classType.getName() + "." + field.getName()
+ "'. Field must be static and its type must be " + type.getName()
+ "<" + typeParameter.getName() + ">.", null);
throw new UnableToCompleteException();
}
collection.add(field);
}
}
}
}
}
