package org.sgx.gwtjavatools.delegate;
import japa.parser.JavaParser;
import japa.parser.ParseException;
import japa.parser.ast.CompilationUnit;
import japa.parser.ast.body.MethodDeclaration;
import japa.parser.ast.body.ModifierSet;
import japa.parser.ast.body.Parameter;
import japa.parser.ast.body.TypeDeclaration;
import japa.parser.ast.type.Type;
import japa.parser.ast.type.VoidType;
import japa.parser.ast.visitor.VoidVisitorAdapter;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
/**
* uses http://code.google.com/p/javaparser for building delegate methods - just
* like eclipse does but automatically choosing only target class methods, not
* methods defined in its superclasses. Also it copies the wrapped javadoc
* method comments
*
* TODO: declared exceptions are ignored
*
* TODO: if param or return types are from .yui. package then transform them into jyui. package types.
*
* @author sg
*
*/
public class JYUIDelegateMethods {
/**
*
* @param sb
* - the sb in which to render the output code
* @param targetJavaClassFile
* - the path, relative to YUIGWT_SRC_ROOT_PATH, of the target
* java class file (the java file of target delegate-to class).
* @param delegateExpression
* - delegate field or getter to which point all delegation,
* example: "this._wrapper" - will result on
* this._wrapper.delegateMethod1(...
* @throws ParseException
* @throws IOException
*/
public void renderDelegateMethods(Config config) throws ParseException, IOException {
File classFile = new File(config.getTargetJavaClassFile());
FileInputStream in = new FileInputStream(classFile);
TypeDeclaration mainType = null;
CompilationUnit cu;
try {
// parse the file
cu = JavaParser.parse(in);
mainType = searchForMainType(cu);
mainType.getName();
} finally {
in.close();
}
config.setTargetType(mainType);
new MethodVisitor(config).visit(cu, null);
}
private TypeDeclaration searchForMainType(CompilationUnit cu) {
for (TypeDeclaration t : cu.getTypes()) {
if ((t.getModifiers() | ModifierSet.PUBLIC) != 0) {
return t;
}
}
return null;
}
/**
* Simple visitor implementation for visiting MethodDeclaration nodes.
*/
private class MethodVisitor extends VoidVisitorAdapter {
Config config;
public MethodVisitor(Config config) {
super();
this.config = config;
}
@Override
public void visit(MethodDeclaration m, Object arg) {
// if(m.getName().equals("voidMethod1")) {
// Type ttt = m.getType();
// }
boolean isPublic = (m.getModifiers() | ModifierSet.PUBLIC) != 0, isStatic = (m.getModifiers() | ModifierSet.STATIC) != 0;
if (!isPublic)
return; // do not delegate non public and non instance methods
// if (isStatic) //TODO: do not work - japa bug ?
// return; // do not delegate static methods
if (definedInSuperClass(m, config.getTargetType()))
return; // do not delegate methods that are defined in a
// superclass
List<Parameter> params = m.getParameters();
StringBuffer javadoc = new StringBuffer(), body = new StringBuffer();
if(m.getJavaDoc()!=null)
javadoc.append(m.getJavaDoc().toString());
// javadoc.append(
// "/**\n" +
// " * ");
body.append("public " + m.getType() + " " + m.getName() + "(");
StringBuffer paramCallList = new StringBuffer();
if (params != null)
for (Iterator it = params.iterator(); it.hasNext();) {
Parameter p = (Parameter) it.next();
body.append(p.getType() + " " + m.getName() + (it.hasNext() ? ", " : ""));
paramCallList.append(m.getName() + (it.hasNext() ? ", " : ""));
}
body.append(") {\n");
String returnExpr = "";
if(! (m.getType() instanceof VoidType)) {
returnExpr+="return ";
}
body.append(returnExpr+config.getDelegateExpression() + "." + m.getName() + "(");
body.append(paramCallList);
body.append("); \n}\n");
config.getSb().append(javadoc);
config.getSb().append("\n");
config.getSb().append(body);
}
}
public static class Config {
StringBuffer sb;
String targetJavaClassFil;
String delegateExpression;
private TypeDeclaration targetType;
/**
* @return the sb
*/
public StringBuffer getSb() {
return sb;
}
public void setTargetType(TypeDeclaration mainType) {
this.targetType = mainType;
}
public TypeDeclaration getTargetType() {
return targetType;
}
/**
* @param sb
* the sb to set
*/
public void setSb(StringBuffer sb) {
this.sb = sb;
}
/**
* @return the targetJavaClassFil
*/
public String getTargetJavaClassFile() {
return targetJavaClassFil;
}
/**
* @param targetJavaClassFil
* the targetJavaClassFil to set
*/
public void setTargetJavaClassFile(String targetJavaClassFil) {
this.targetJavaClassFil = targetJavaClassFil;
}
/**
* @return the delegateExpression
*/
public String getDelegateExpression() {
return delegateExpression;
}
/**
* @param delegateExpression
* the delegateExpression to set
*/
public void setDelegateExpression(String delegateExpression) {
this.delegateExpression = delegateExpression;
}
// /**
// * @return the className
// */
// public String getClassName() {
// return className;
// }
// /**
// * @param className the className to set
// */
// public void setClassName(String className) {
// this.className = className;
// }
}
public boolean definedInSuperClass(MethodDeclaration m, TypeDeclaration targetType) {
return false;
/* JAPA only parses the methods defined in the target java file - so no methods defined in superclasses are paresd. */
}
// test
public static void main(String[] args) {
String YUIGWT_SRC_ROOT_PATH = "/home/sebastian/workspace3.7/yuigwt/src/",
targetFileClass = "org/sgx/yuigwt/yui/widget/button/ButtonConfig.java",
delegateExpression = "_wrappedButtonConfig()",
targetJavaClassFile = YUIGWT_SRC_ROOT_PATH + targetFileClass;;
JYUIDelegateMethods tool = new JYUIDelegateMethods();
StringBuffer sb = new StringBuffer();
try {
Config config = new Config();
config.setSb(sb);
config.setDelegateExpression(delegateExpression);
config.setTargetJavaClassFile(targetJavaClassFile);
tool.renderDelegateMethods(config);
System.out.println(sb);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}