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/*
* Copyright © 2009-2010 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac.handlers;
import static lombok.javac.handlers.JavacHandlerUtil.*;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.core.AnnotationValues;
import lombok.core.AST.Kind;
import lombok.core.handlers.TransformationsUtil;
import lombok.javac.Javac;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
import org.mangosdk.spi.ProviderFor;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCBlock;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCTypeParameter;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.Name;
import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
/**
* Handles the {@code lombok.Getter} annotation for javac.
*/
@ProviderFor(JavacAnnotationHandler.class)
public class HandleGetter implements JavacAnnotationHandler<Getter> {
/**
* Generates a getter on the stated field.
*
* Used by {@link HandleData}.
*
* The difference between this call and the handle method is as follows:
*
* If there is a {@code lombok.Getter} annotation on the field, it is used and the
* same rules apply (e.g. warning if the method already exists, stated access level applies).
* If not, the getter is still generated if it isn't already there, though there will not
* be a warning if its already there. The default access level is used.
*
* @param fieldNode The node representing the field you want a getter for.
* @param pos The node responsible for generating the getter (the {@code @Data} or {@code @Getter} annotation).
*/
public void generateGetterForField(JavacNode fieldNode, DiagnosticPosition pos, AccessLevel level, boolean checkForTypeLevelGetter) {
for (JavacNode child : fieldNode.down()) {
if (child.getKind() == Kind.ANNOTATION) {
if (Javac.annotationTypeMatches(Getter.class, child)) {
//The annotation will make it happen, so we can skip it.
return;
}
}
}
if (checkForTypeLevelGetter) {
JavacNode containingType = fieldNode.up();
if (containingType != null) for (JavacNode child : containingType.down()) {
if (child.getKind() == Kind.ANNOTATION) {
if (Javac.annotationTypeMatches(Getter.class, child)) {
//The annotation will make it happen, so we can skip it.
return;
}
}
}
}
createGetterForField(level, fieldNode, fieldNode, false);
}
@Override public boolean handle(AnnotationValues<Getter> annotation, JCAnnotation ast, JavacNode annotationNode) {
markAnnotationAsProcessed(annotationNode, Getter.class);
JavacNode node = annotationNode.up();
AccessLevel level = annotation.getInstance().value();
if (level == AccessLevel.NONE) return true;
if (node == null) return false;
if (node.getKind() == Kind.FIELD) {
return createGetterForField(level, node, annotationNode, true);
}
if (node.getKind() == Kind.TYPE) {
JCClassDecl typeDecl = null;
if (node.get() instanceof JCClassDecl) typeDecl = (JCClassDecl) node.get();
long modifiers = typeDecl == null ? 0 : typeDecl.mods.flags;
boolean notAClass = (modifiers & (Flags.INTERFACE | Flags.ANNOTATION | Flags.ENUM)) != 0;
if (typeDecl == null || notAClass) {
annotationNode.addError("@Getter is only supported on a class.");
return false;
}
for (JavacNode field : node.down()) {
if (field.getKind() != Kind.FIELD) continue;
generateGetterForField(field, ast, level, false);
}
return true;
}
return false;
}
private boolean createGetterForField(AccessLevel level,
JavacNode fieldNode, JavacNode errorNode, boolean whineIfExists) {
if (fieldNode.getKind() != Kind.FIELD) {
errorNode.addError("@Getter is only supported on a field.");
return true;
}
JCVariableDecl fieldDecl = (JCVariableDecl)fieldNode.get();
String methodName = toGetterName(fieldDecl);
for (String altName : toAllGetterNames(fieldDecl)) {
switch (methodExists(altName, fieldNode, false)) {
case EXISTS_BY_LOMBOK:
return true;
case EXISTS_BY_USER:
if (whineIfExists) {
String altNameExpl = "";
if (!altName.equals(methodName)) altNameExpl = String.format(" (%s)", altName);
errorNode.addWarning(
String.format("Not generating %s(): A method with that name already exists%s", methodName, altNameExpl));
}
return true;
default:
case NOT_EXISTS:
//continue scanning the other alt names.
}
}
long access = toJavacModifier(level) | (fieldDecl.mods.flags & Flags.STATIC);
injectMethod(fieldNode.up(), createGetter(access, fieldNode, fieldNode.getTreeMaker()));
return true;
}
private JCMethodDecl createGetter(long access, JavacNode field, TreeMaker treeMaker) {
JCVariableDecl fieldNode = (JCVariableDecl) field.get();
JCFieldAccess thisX = treeMaker.Select(treeMaker.Ident(field.toName("this")), fieldNode.name);
JCStatement returnStatement = treeMaker.Return(thisX);
JCBlock methodBody = treeMaker.Block(0, List.of(returnStatement));
Name methodName = field.toName(toGetterName(fieldNode));
JCExpression methodType = fieldNode.type != null ? treeMaker.Type(fieldNode.type) : fieldNode.vartype;
List<JCTypeParameter> methodGenericParams = List.nil();
List<JCVariableDecl> parameters = List.nil();
List<JCExpression> throwsClauses = List.nil();
JCExpression annotationMethodDefaultValue = null;
List<JCAnnotation> nonNulls = findAnnotations(field, TransformationsUtil.NON_NULL_PATTERN);
List<JCAnnotation> nullables = findAnnotations(field, TransformationsUtil.NULLABLE_PATTERN);
return treeMaker.MethodDef(treeMaker.Modifiers(access, nonNulls.appendList(nullables)), methodName, methodType,
methodGenericParams, parameters, throwsClauses, methodBody, annotationMethodDefaultValue);
}
}
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