/**
* Builds a new {@link MethodInvocation} instance.
*
* @param expression the method invocation expression
* @param methodName the name of the invoked method
* @param arguments the arguments for the method invocation
* @return a new method invocation
*/
public MethodInvocation invoke(String expression, String methodName, Expression... arguments) {
final MethodInvocation mi = ast.newMethodInvocation();
mi.setExpression(ast.newSimpleName(expression));
mi.setName(ast.newSimpleName(methodName));
addAll(arguments(mi), arguments);
return mi;
}
@SuppressWarnings("unchecked")
public MethodInvocation newCall(Expression obj, String funName, Expression... args) {
MethodInvocation call = ast.newMethodInvocation();
call.setExpression(obj);
call.setName(ast.newSimpleName(funName));
call.arguments().addAll(Arrays.asList(args));
return call;
}
/**
* Builds a new {@link MethodInvocation} instance.
*
* @param <E> the arguments type
* @param expression the method invocation expression
* @param methodName the name of the invoked method
* @param arguments the arguments for the method invocation
* @return a new method invocation
*/
public <E extends Expression> MethodInvocation invoke(
Expression expression, String methodName, List<E> arguments) {
final MethodInvocation mi = ast.newMethodInvocation();
mi.setExpression(expression);
mi.setName(ast.newSimpleName(methodName));
addAll(arguments, mi);
return mi;
}
/**
* create the update code block with dao invoked.
*
* @param ast the ast tree. fc the configuration.
*/
@SuppressWarnings("unchecked")
public Block createBlock(AST ast, FastIbatisConfig fc) {
Block block = ast.newBlock();
MethodInvocation methodInvocation = ast.newMethodInvocation();
methodInvocation.setExpression(ast.newName(Utils.lowFirstChar(fc.getModelName()) + "DAO"));
methodInvocation.setName(ast.newSimpleName(fc.getMethodName()));
methodInvocation.arguments().add(ast.newSimpleName("param"));
ReturnStatement rs = ast.newReturnStatement();
rs.setExpression(methodInvocation);
block.statements().add(rs);
return block;
}
private Delta deduplicate(CompilationUnit root, ASTRewrite rewrite, Cause cause) {
final List<ASTNode> nodes = cause.getAffectedNodes();
final int size = nodes.size();
final int cloneNumber = size == 0 ? size : size - 1; // minus the original declaration
if (cloneNumber == 0) {
throw new RuntimeException("calling deduplicate() when there are no detected clones");
} else if (cloneNumber >= 1) {
// NOTE: THIS WORKS ONLY AT METHOD LEVEL, other forms of duplication will
// will be ignored.
// The strategy this code follows to perform deduplication is the following:
// per duplicated method declaration, find all of its invocations. Then
// rename each found invocation using the name of the original method declaration.
// After that, remove the duplicated method declaration.
if (AstUtil.isOfType(MethodDeclaration.class, nodes.get(0))) {
final MethodDeclaration original = AstUtil.exactCast(MethodDeclaration.class, nodes.get(0));
final Iterable<ASTNode> rest = Iterables.skip(nodes, 1);
for (ASTNode eachClone : rest) {
final MethodDeclaration duplicate = AstUtil.exactCast(MethodDeclaration.class, eachClone);
final MethodDeclaration copied =
AstUtil.copySubtree(MethodDeclaration.class, root.getAST(), duplicate);
final boolean sameReturn = sameReturnType(original, copied);
if (!sameReturn) { // all or none. We don't do partial deduplication
throw new RuntimeException(
"automatic deduplication cannot be done on methods "
+ "with different return types; please consider "
+ "manual deduplication.");
}
final MethodInvocationVisitor invokesOfDuplication =
new MethodInvocationVisitor(copied.getName());
root.accept(invokesOfDuplication);
final Set<MethodInvocation> invokes = invokesOfDuplication.getMethodInvocations();
for (MethodInvocation each : invokes) {
final MethodInvocation copiedInvoke =
AstUtil.copySubtree(MethodInvocation.class, root.getAST(), each);
copiedInvoke.setName(root.getAST().newSimpleName(original.getName().getIdentifier()));
rewrite.replace(each, copiedInvoke, null);
}
rewrite.remove(duplicate, null);
}
}
}
return createDelta(root, rewrite);
}
public void testASTRewriteExample() throws Exception {
// create a new project
IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject("Test");
project.create(null);
project.open(null);
try {
// set the Java nature and Java build path
IProjectDescription description = project.getDescription();
description.setNatureIds(new String[] {JavaCore.NATURE_ID});
project.setDescription(description, null);
IJavaProject javaProject = JavaCore.create(project);
// build path is: project as source folder and JRE container
IClasspathEntry[] cpentry =
new IClasspathEntry[] {
JavaCore.newSourceEntry(javaProject.getPath()),
JavaRuntime.getDefaultJREContainerEntry()
};
javaProject.setRawClasspath(cpentry, javaProject.getPath(), null);
Map<String, String> options = new HashMap<>();
options.put(DefaultCodeFormatterConstants.FORMATTER_TAB_CHAR, JavaCore.SPACE);
options.put(DefaultCodeFormatterConstants.FORMATTER_TAB_SIZE, "4");
javaProject.setOptions(options);
// create a test file
IPackageFragmentRoot root = javaProject.getPackageFragmentRoot(project);
IPackageFragment pack1 = root.createPackageFragment("test1", false, null);
StringBuffer buf = new StringBuffer();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public void foo(int i) {\n");
buf.append(" while (--i > 0) {\n");
buf.append(" System.beep();\n");
buf.append(" }\n");
buf.append(" }\n");
buf.append("}\n");
ICompilationUnit cu = pack1.createCompilationUnit("E.java", buf.toString(), false, null);
// create an AST
ASTParser parser = ASTParser.newParser(IASTSharedValues.SHARED_AST_LEVEL);
parser.setSource(cu);
parser.setResolveBindings(false);
CompilationUnit astRoot = (CompilationUnit) parser.createAST(null);
AST ast = astRoot.getAST();
// create the descriptive ast rewriter
ASTRewrite rewrite = ASTRewrite.create(ast);
// get the block node that contains the statements in the method body
TypeDeclaration typeDecl = (TypeDeclaration) astRoot.types().get(0);
MethodDeclaration methodDecl = typeDecl.getMethods()[0];
Block block = methodDecl.getBody();
// create new statements to insert
MethodInvocation newInv1 = ast.newMethodInvocation();
newInv1.setName(ast.newSimpleName("bar1"));
Statement newStatement1 = ast.newExpressionStatement(newInv1);
MethodInvocation newInv2 = ast.newMethodInvocation();
newInv2.setName(ast.newSimpleName("bar2"));
Statement newStatement2 = ast.newExpressionStatement(newInv2);
// describe that the first node is inserted as first statement in block, the other one as last
// statement
// note: AST is not modified by this
ListRewrite listRewrite = rewrite.getListRewrite(block, Block.STATEMENTS_PROPERTY);
listRewrite.insertFirst(newStatement1, null);
listRewrite.insertLast(newStatement2, null);
// evaluate the text edits corresponding to the described changes. AST and CU still
// unmodified.
TextEdit res = rewrite.rewriteAST();
// apply the text edits to the compilation unit
Document document = new Document(cu.getSource());
res.apply(document);
cu.getBuffer().setContents(document.get());
// test result
String preview = cu.getSource();
buf = new StringBuffer();
buf.append("package test1;\n");
buf.append("public class E {\n");
buf.append(" public void foo(int i) {\n");
buf.append(" bar1();\n");
buf.append(" while (--i > 0) {\n");
buf.append(" System.beep();\n");
buf.append(" }\n");
buf.append(" bar2();\n");
buf.append(" }\n");
buf.append("}\n");
assertEquals(preview, buf.toString());
} finally {
project.delete(true, null);
}
}
