package org.springframework.roo.classpath.javaparser.details;
import japa.parser.JavaParser;
import japa.parser.ParseException;
import japa.parser.ast.CompilationUnit;
import japa.parser.ast.TypeParameter;
import japa.parser.ast.body.BodyDeclaration;
import japa.parser.ast.body.MethodDeclaration;
import japa.parser.ast.body.Parameter;
import japa.parser.ast.body.TypeDeclaration;
import japa.parser.ast.body.VariableDeclaratorId;
import japa.parser.ast.expr.AnnotationExpr;
import japa.parser.ast.expr.NameExpr;
import japa.parser.ast.stmt.BlockStmt;
import japa.parser.ast.type.ClassOrInterfaceType;
import japa.parser.ast.type.ReferenceType;
import japa.parser.ast.type.Type;
import java.io.ByteArrayInputStream;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.springframework.roo.classpath.PhysicalTypeCategory;
import org.springframework.roo.classpath.details.MethodMetadata;
import org.springframework.roo.classpath.details.MethodMetadataBuilder;
import org.springframework.roo.classpath.details.annotations.AnnotatedJavaType;
import org.springframework.roo.classpath.details.annotations.AnnotationMetadata;
import org.springframework.roo.classpath.itd.InvocableMemberBodyBuilder;
import org.springframework.roo.classpath.javaparser.CompilationUnitServices;
import org.springframework.roo.classpath.javaparser.JavaParserUtils;
import org.springframework.roo.model.Builder;
import org.springframework.roo.model.JavaSymbolName;
import org.springframework.roo.model.JavaType;
/**
* Java Parser implementation of {@link MethodMetadata}.
*
* @author Ben Alex
* @since 1.0
*/
public class JavaParserMethodMetadataBuilder implements Builder<MethodMetadata> {
public static void addMethod(
final CompilationUnitServices compilationUnitServices,
final List<BodyDeclaration> members, final MethodMetadata method,
Set<JavaSymbolName> typeParameters) {
Validate.notNull(compilationUnitServices,
"Flushable compilation unit services required");
Validate.notNull(members, "Members required");
Validate.notNull(method, "Method required");
if (typeParameters == null) {
typeParameters = new HashSet<JavaSymbolName>();
}
// Create the return type we should use
Type returnType = null;
if (method.getReturnType().isPrimitive()) {
returnType = JavaParserUtils.getType(method.getReturnType());
}
else {
final NameExpr importedType = JavaParserUtils.importTypeIfRequired(
compilationUnitServices.getEnclosingTypeName(),
compilationUnitServices.getImports(),
method.getReturnType());
final ClassOrInterfaceType cit = JavaParserUtils
.getClassOrInterfaceType(importedType);
// Add any type arguments presented for the return type
if (method.getReturnType().getParameters().size() > 0) {
final List<Type> typeArgs = new ArrayList<Type>();
cit.setTypeArgs(typeArgs);
for (final JavaType parameter : method.getReturnType()
.getParameters()) {
typeArgs.add(JavaParserUtils.importParametersForType(
compilationUnitServices.getEnclosingTypeName(),
compilationUnitServices.getImports(), parameter));
}
}
// Handle arrays
if (method.getReturnType().isArray()) {
final ReferenceType rt = new ReferenceType();
rt.setArrayCount(method.getReturnType().getArray());
rt.setType(cit);
returnType = rt;
}
else {
returnType = cit;
}
}
// Start with the basic method
final MethodDeclaration d = new MethodDeclaration();
d.setModifiers(JavaParserUtils.getJavaParserModifier(method
.getModifier()));
d.setName(method.getMethodName().getSymbolName());
d.setType(returnType);
// Add any method-level annotations (not parameter annotations)
final List<AnnotationExpr> annotations = new ArrayList<AnnotationExpr>();
d.setAnnotations(annotations);
for (final AnnotationMetadata annotation : method.getAnnotations()) {
JavaParserAnnotationMetadataBuilder.addAnnotationToList(
compilationUnitServices, annotations, annotation);
}
// Add any method parameters, including their individual annotations and
// type parameters
final List<Parameter> parameters = new ArrayList<Parameter>();
d.setParameters(parameters);
int index = -1;
for (final AnnotatedJavaType methodParameter : method
.getParameterTypes()) {
index++;
// Add the parameter annotations applicable for this parameter type
final List<AnnotationExpr> parameterAnnotations = new ArrayList<AnnotationExpr>();
for (final AnnotationMetadata parameterAnnotation : methodParameter
.getAnnotations()) {
JavaParserAnnotationMetadataBuilder.addAnnotationToList(
compilationUnitServices, parameterAnnotations,
parameterAnnotation);
}
// Compute the parameter name
final String parameterName = method.getParameterNames().get(index)
.getSymbolName();
// Compute the parameter type
Type parameterType = null;
if (methodParameter.getJavaType().isPrimitive()) {
parameterType = JavaParserUtils.getType(methodParameter
.getJavaType());
}
else {
final NameExpr type = JavaParserUtils.importTypeIfRequired(
compilationUnitServices.getEnclosingTypeName(),
compilationUnitServices.getImports(),
methodParameter.getJavaType());
final ClassOrInterfaceType cit = JavaParserUtils
.getClassOrInterfaceType(type);
// Add any type arguments presented for the return type
if (methodParameter.getJavaType().getParameters().size() > 0) {
final List<Type> typeArgs = new ArrayList<Type>();
cit.setTypeArgs(typeArgs);
for (final JavaType parameter : methodParameter
.getJavaType().getParameters()) {
typeArgs.add(JavaParserUtils.importParametersForType(
compilationUnitServices.getEnclosingTypeName(),
compilationUnitServices.getImports(), parameter));
}
}
// Handle arrays
if (methodParameter.getJavaType().isArray()) {
final ReferenceType rt = new ReferenceType();
rt.setArrayCount(methodParameter.getJavaType().getArray());
rt.setType(cit);
parameterType = rt;
}
else {
parameterType = cit;
}
}
// Create a Java Parser method parameter and add it to the list of
// parameters
final Parameter p = new Parameter(parameterType,
new VariableDeclaratorId(parameterName));
p.setVarArgs(methodParameter.isVarArgs());
p.setAnnotations(parameterAnnotations);
parameters.add(p);
}
// Add exceptions which the method my throw
if (method.getThrowsTypes().size() > 0) {
final List<NameExpr> throwsTypes = new ArrayList<NameExpr>();
for (final JavaType javaType : method.getThrowsTypes()) {
final NameExpr importedType = JavaParserUtils
.importTypeIfRequired(
compilationUnitServices.getEnclosingTypeName(),
compilationUnitServices.getImports(), javaType);
throwsTypes.add(importedType);
}
d.setThrows(throwsTypes);
}
// Set the body
if (StringUtils.isBlank(method.getBody())) {
// Never set the body if an abstract method
if (!Modifier.isAbstract(method.getModifier())
&& !PhysicalTypeCategory.INTERFACE
.equals(compilationUnitServices
.getPhysicalTypeCategory())) {
d.setBody(new BlockStmt());
}
}
else {
// There is a body.
// We need to make a fake method that we can have JavaParser parse.
// Easiest way to do that is to build a simple source class
// containing the required method and re-parse it.
final StringBuilder sb = new StringBuilder();
sb.append("class TemporaryClass {\n");
sb.append(" public void temporaryMethod() {\n");
sb.append(method.getBody());
sb.append("\n");
sb.append(" }\n");
sb.append("}\n");
final ByteArrayInputStream bais = new ByteArrayInputStream(sb
.toString().getBytes());
CompilationUnit ci;
try {
ci = JavaParser.parse(bais);
}
catch (final ParseException pe) {
throw new IllegalStateException(
"Illegal state: JavaParser did not parse correctly", pe);
}
final List<TypeDeclaration> types = ci.getTypes();
if (types == null || types.size() != 1) {
throw new IllegalArgumentException("Method body invalid");
}
final TypeDeclaration td = types.get(0);
final List<BodyDeclaration> bodyDeclarations = td.getMembers();
if (bodyDeclarations == null || bodyDeclarations.size() != 1) {
throw new IllegalStateException(
"Illegal state: JavaParser did not return body declarations correctly");
}
final BodyDeclaration bd = bodyDeclarations.get(0);
if (!(bd instanceof MethodDeclaration)) {
throw new IllegalStateException(
"Illegal state: JavaParser did not return a method declaration correctly");
}
final MethodDeclaration md = (MethodDeclaration) bd;
d.setBody(md.getBody());
}
// Locate where to add this method; also verify if this method already
// exists
for (final BodyDeclaration bd : members) {
if (bd instanceof MethodDeclaration) {
// Next method should appear after this current method
final MethodDeclaration md = (MethodDeclaration) bd;
if (md.getName().equals(d.getName())) {
if ((md.getParameters() == null || md.getParameters()
.isEmpty())
&& (d.getParameters() == null || d.getParameters()
.isEmpty())) {
throw new IllegalStateException("Method '"
+ method.getMethodName().getSymbolName()
+ "' already exists");
}
else if (md.getParameters() != null
&& md.getParameters().size() == d.getParameters()
.size()) {
// Possible match, we need to consider parameter types
// as well now
final MethodMetadata methodMetadata = JavaParserMethodMetadataBuilder
.getInstance(method.getDeclaredByMetadataId(),
md, compilationUnitServices,
typeParameters).build();
boolean matchesFully = true;
index = -1;
for (final AnnotatedJavaType existingParameter : methodMetadata
.getParameterTypes()) {
index++;
final AnnotatedJavaType parameterType = method
.getParameterTypes().get(index);
if (!existingParameter.getJavaType().equals(
parameterType.getJavaType())) {
matchesFully = false;
break;
}
}
if (matchesFully) {
throw new IllegalStateException(
"Method '"
+ method.getMethodName()
.getSymbolName()
+ "' already exists with identical parameters");
}
}
}
}
}
// Add the method to the end of the compilation unit
members.add(d);
}
public static JavaParserMethodMetadataBuilder getInstance(
final String declaredByMetadataId,
final MethodDeclaration methodDeclaration,
final CompilationUnitServices compilationUnitServices,
final Set<JavaSymbolName> typeParameters) {
return new JavaParserMethodMetadataBuilder(declaredByMetadataId,
methodDeclaration, compilationUnitServices, typeParameters);
}
private final List<AnnotationMetadata> annotations = new ArrayList<AnnotationMetadata>();
private String body;
private final String declaredByMetadataId;
private final JavaSymbolName methodName;
private final int modifier;
private final List<JavaSymbolName> parameterNames = new ArrayList<JavaSymbolName>();
private final List<AnnotatedJavaType> parameterTypes = new ArrayList<AnnotatedJavaType>();
private final JavaType returnType;
private final List<JavaType> throwsTypes = new ArrayList<JavaType>();
private JavaParserMethodMetadataBuilder(final String declaredByMetadataId,
final MethodDeclaration methodDeclaration,
final CompilationUnitServices compilationUnitServices,
final Set<JavaSymbolName> typeParameters) {
Validate.notBlank(declaredByMetadataId,
"Declared by metadata ID required");
Validate.notNull(methodDeclaration, "Method declaration is mandatory");
Validate.notNull(compilationUnitServices,
"Compilation unit services are required");
this.declaredByMetadataId = declaredByMetadataId;
// Convert Java Parser modifier into JDK modifier
modifier = JavaParserUtils.getJdkModifier(methodDeclaration
.getModifiers());
// Add method-declared type parameters (if any) to the list of type
// parameters
final Set<JavaSymbolName> fullTypeParameters = new HashSet<JavaSymbolName>();
fullTypeParameters.addAll(typeParameters);
final List<TypeParameter> params = methodDeclaration
.getTypeParameters();
if (params != null) {
for (final TypeParameter candidate : params) {
final JavaSymbolName currentTypeParam = new JavaSymbolName(
candidate.getName());
fullTypeParameters.add(currentTypeParam);
}
}
// Compute the return type
final Type rt = methodDeclaration.getType();
returnType = JavaParserUtils.getJavaType(compilationUnitServices, rt,
fullTypeParameters);
// Compute the method name
methodName = new JavaSymbolName(methodDeclaration.getName());
// Get the body
body = methodDeclaration.getBody() == null ? null : methodDeclaration
.getBody().toString();
if (body != null) {
body = StringUtils.replace(body, "{", "", 1);
body = body.substring(0, body.lastIndexOf("}"));
}
// Lookup the parameters and their names
if (methodDeclaration.getParameters() != null) {
for (final Parameter p : methodDeclaration.getParameters()) {
final Type pt = p.getType();
final JavaType parameterType = JavaParserUtils.getJavaType(
compilationUnitServices, pt, fullTypeParameters);
final List<AnnotationExpr> annotationsList = p.getAnnotations();
final List<AnnotationMetadata> annotations = new ArrayList<AnnotationMetadata>();
if (annotationsList != null) {
for (final AnnotationExpr candidate : annotationsList) {
final AnnotationMetadata annotationMetadata = JavaParserAnnotationMetadataBuilder
.getInstance(candidate, compilationUnitServices)
.build();
annotations.add(annotationMetadata);
}
}
final AnnotatedJavaType param = new AnnotatedJavaType(
parameterType, annotations);
param.setVarArgs(p.isVarArgs());
parameterTypes.add(param);
parameterNames.add(new JavaSymbolName(p.getId().getName()));
}
}
if (methodDeclaration.getThrows() != null) {
for (final NameExpr throwsType : methodDeclaration.getThrows()) {
final JavaType throwing = JavaParserUtils
.getJavaType(compilationUnitServices, throwsType,
fullTypeParameters);
throwsTypes.add(throwing);
}
}
if (methodDeclaration.getAnnotations() != null) {
for (final AnnotationExpr annotation : methodDeclaration
.getAnnotations()) {
annotations.add(JavaParserAnnotationMetadataBuilder
.getInstance(annotation, compilationUnitServices)
.build());
}
}
}
public MethodMetadata build() {
final MethodMetadataBuilder methodMetadataBuilder = new MethodMetadataBuilder(
declaredByMetadataId);
methodMetadataBuilder.setMethodName(methodName);
methodMetadataBuilder.setReturnType(returnType);
methodMetadataBuilder.setAnnotations(annotations);
methodMetadataBuilder.setBodyBuilder(InvocableMemberBodyBuilder
.getInstance().append(body));
methodMetadataBuilder.setModifier(modifier);
methodMetadataBuilder.setParameterNames(parameterNames);
methodMetadataBuilder.setParameterTypes(parameterTypes);
methodMetadataBuilder.setThrowsTypes(throwsTypes);
return methodMetadataBuilder.build();
}
}