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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2007 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.codehaus.groovy.classgen;
import java.util.*;
import org.codehaus.groovy.ast.*;
import org.codehaus.groovy.ast.stmt.ReturnStatement;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.control.ErrorCollector;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.control.messages.SyntaxErrorMessage;
import org.codehaus.groovy.syntax.SyntaxException;
import org.codehaus.groovy.vmplugin.VMPluginFactory;
/**
* An Annotation visitor responsible with:
* - reading annotation metadata (@Retention, @Target, attribute types)
* - verify that an AnnotationNode conforms to annotation meta
* - enhancing an AnnotationNode AST to reflect real annotation meta
*
* @author Alex Popescu
*/
public class AnnotationVisitor {
private SourceUnit source;
private ErrorCollector errorCollector;
private AnnotationNode annotation;
private ClassNode reportClass;
public AnnotationVisitor(SourceUnit source, ErrorCollector errorCollector) {
this.source = source;
this.errorCollector = errorCollector;
}
public void setReportClass(ClassNode cn) {
reportClass = cn;
}
public AnnotationNode visit(AnnotationNode node) {
this.annotation = node;
this.reportClass = node.getClassNode();
if(!isValidAnnotationClass(node.getClassNode())) {
addError("class " + node.getClassNode().getName() + " is not an annotation");
return node;
}
Map attributes = node.getMembers();
// check if values have been passed for all annotation attributes that don't have defaults
if(!checkIfMandatoryAnnotationValuesPassed(node)) {
return node;
}
for(Iterator it = attributes.entrySet().iterator(); it.hasNext(); ) {
Map.Entry entry = (Map.Entry) it.next();
String attrName = (String) entry.getKey();
Expression attrExpr = (Expression) entry.getValue();
ClassNode attrType = getAttributeType(node, attrName);
visitExpression(attrName, attrExpr, attrType);
}
VMPluginFactory.getPlugin().configureAnnotation(node);
return this.annotation;
}
private boolean checkIfMandatoryAnnotationValuesPassed(AnnotationNode node) {
boolean ok = true;
Map attributes = node.getMembers();
List methods = node.getClassNode().getMethods();
for(MethodNode mn : methods) {
String methodName = mn.getName();
// if the annotation attribute has a default, getCode() returns a ReturnStatement with the default value
if(mn.getCode() == null && !attributes.containsKey(methodName)) {
addError("No explicit/default value found for annotation attribute '" + methodName + "' in annotation " + node.getClassNode(), node);
ok = false;
}
}
return ok;
}
private ClassNode getAttributeType(AnnotationNode node, String attrName) {
List methods = node.getClassNode().getMethods(attrName);
// if size is >1, then the method was overwritten or something, we ignore that
// if it is an error, we have to test it at another place. But size==0 is
// an error, because it means that no such attribute exists.
if (methods.size() == 0) {
addError("'" + attrName + "'is not part of the annotation " + node.getClassNode(), node);
return ClassHelper.OBJECT_TYPE;
}
MethodNode method = (MethodNode) methods.get(0);
return method.getReturnType();
}
private boolean isValidAnnotationClass(ClassNode node) {
return node.implementsInterface(ClassHelper.Annotation_TYPE);
}
protected void visitExpression(String attrName, Expression attrExp, ClassNode attrType) {
if (attrType.isArray()) {
// check needed as @Test(attr = {"elem"}) passes through the parser
if (attrExp instanceof ListExpression) {
ListExpression le = (ListExpression) attrExp;
visitListExpression(attrName, (ListExpression) attrExp, attrType.getComponentType());
} else if (attrExp instanceof ClosureExpression) {
addError("Annotation list attributes must use Groovy notation [el1, el2]", attrExp);
} else {
// treat like a singleton list as per Java
ListExpression listExp = new ListExpression();
listExp.addExpression(attrExp);
if (annotation != null) {
annotation.setMember(attrName, listExp);
}
visitExpression(attrName, listExp, attrType);
}
} else if (ClassHelper.isPrimitiveType(attrType)) {
visitConstantExpression(attrName, getConstantExpression(attrExp), ClassHelper.getWrapper(attrType));
} else if (ClassHelper.STRING_TYPE.equals(attrType)) {
visitConstantExpression(attrName, getConstantExpression(attrExp), ClassHelper.STRING_TYPE);
} else if (ClassHelper.CLASS_Type.equals(attrType)) {
if (!(attrExp instanceof ClassExpression)) {
addError("Only classes can be used for attribute '"+attrName+"'",attrExp);
}
} else if (attrType.isDerivedFrom(ClassHelper.Enum_Type)) {
if (attrExp instanceof PropertyExpression) {
visitEnumExpression(attrName, (PropertyExpression) attrExp, attrType);
} else {
addError("Expected enum value for attribute " + attrName, attrExp);
}
} else if (isValidAnnotationClass(attrType)) {
if (attrExp instanceof AnnotationConstantExpression) {
visitAnnotationExpression(attrName, (AnnotationConstantExpression) attrExp, attrType);
} else {
addError("Expected annotation of type '"+attrType.getName()+"' for attribute "+attrName, attrExp);
}
} else {
addError("Unexpected type "+attrType.getName(),attrExp);
}
}
public void checkReturnType(ClassNode attrType,ASTNode node) {
if(attrType.isArray()) {
checkReturnType(attrType.getComponentType(),node);
} else if (ClassHelper.isPrimitiveType(attrType)) {
return;
} else if (ClassHelper.STRING_TYPE.equals(attrType)) {
return;
} else if (ClassHelper.CLASS_Type.equals(attrType)) {
return;
} else if (attrType.isDerivedFrom(ClassHelper.Enum_Type)) {
return;
} else if (isValidAnnotationClass(attrType)) {
return;
} else {
addError("Unexpected return type "+attrType.getName(),node);
}
}
private ConstantExpression getConstantExpression(Expression exp) {
if (exp instanceof ConstantExpression) {
return (ConstantExpression) exp;
} else {
addError("expected a constant",exp);
return ConstantExpression.EMTPY_EXPRESSION;
}
}
/**
* @param attrName
* @param expression
* @param attrType
*/
protected void visitAnnotationExpression(String attrName, AnnotationConstantExpression expression, ClassNode attrType) {
AnnotationNode annotationNode = (AnnotationNode) expression.getValue();
AnnotationVisitor visitor = new AnnotationVisitor(this.source, this.errorCollector);
visitor.visit(annotationNode);
}
protected void visitListExpression(String attrName, ListExpression listExpr, ClassNode elementType) {
List expressions = listExpr.getExpressions();
for (int i = 0; i < expressions.size(); i++) {
visitExpression(attrName, (Expression) expressions.get(i), elementType);
}
}
protected void visitConstantExpression(String attrName, ConstantExpression constExpr, ClassNode attrType) {
if(!constExpr.getType().isDerivedFrom(attrType)) {
addError("Attribute '" + attrName + "' should have type '" + attrType.getName() + "'; "
+ "but found type '" + constExpr.getType().getName() + "'",
constExpr);
}
}
protected void visitEnumExpression(String attrName, PropertyExpression propExpr, ClassNode attrType) {
if(!propExpr.getObjectExpression().getType().isDerivedFrom(attrType)) {
addError("Attribute '" + attrName + "' should have type '" + attrType.getName() +"' (Enum), but found "
+ propExpr.getObjectExpression().getType().getName(),
propExpr);
}
}
protected void addError(String msg) {
addError(msg,this.annotation);
}
protected void addError(String msg, ASTNode expr) {
this.errorCollector.addErrorAndContinue(
new SyntaxErrorMessage(new SyntaxException(msg
+ " in @" + this.reportClass.getName() + '\n',
expr.getLineNumber(),
expr.getColumnNumber()), this.source)
);
}
public void checkcircularReference(ClassNode searchClass, ClassNode attrType,Expression startExp) {
if (!isValidAnnotationClass(attrType)) return;
AnnotationConstantExpression ace = (AnnotationConstantExpression) startExp;
AnnotationNode annotationNode = (AnnotationNode) ace.getValue();
if (annotationNode.getClassNode().equals(searchClass)) {
addError ("Cirecular reference discovered in "+searchClass.getName(),startExp);
return;
}
ClassNode cn = annotationNode.getClassNode();
List methods = cn.getMethods();
for(Iterator it=methods.iterator(); it.hasNext();) {
MethodNode method = (MethodNode) it.next();
if (method.getReturnType().equals(searchClass)) {
addError ("Cirecular reference discovered in "+cn.getName(),startExp);
}
ReturnStatement code = (ReturnStatement) method.getCode();
if (code==null) continue;
checkcircularReference(searchClass,method.getReturnType(),code.getExpression());
}
}
}