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package lombok.eclipse.handlers;
import java.util.ArrayList;
import java.util.List;
import lombok.SneakyThrows;
import lombok.core.AnnotationValues;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseAST.Node;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.Argument;
import org.eclipse.jdt.internal.compiler.ast.ArrayInitializer;
import org.eclipse.jdt.internal.compiler.ast.Block;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.MemberValuePair;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.QualifiedNameReference;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.ThrowStatement;
import org.eclipse.jdt.internal.compiler.ast.TryStatement;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
import org.mangosdk.spi.ProviderFor;
@ProviderFor(EclipseAnnotationHandler.class)
public class HandleSneakyThrows implements EclipseAnnotationHandler<SneakyThrows> {
private static class DeclaredException {
final String exceptionName;
final ASTNode node;
DeclaredException(String exceptionName, ASTNode node) {
this.exceptionName = exceptionName;
this.node = node;
}
public long getPos() {
return (long)node.sourceStart << 32 | node.sourceEnd;
}
}
@Override public boolean handle(AnnotationValues<SneakyThrows> annotation, Annotation ast, Node annotationNode) {
List<String> exceptionNames = annotation.getRawExpressions("value");
MemberValuePair[] memberValuePairs = ast.memberValuePairs();
if ( memberValuePairs == null || memberValuePairs.length == 0 ) return false;
Expression arrayOrSingle = memberValuePairs[0].value;
final Expression[] exceptionNameNodes;
if ( arrayOrSingle instanceof ArrayInitializer ) {
exceptionNameNodes = ((ArrayInitializer)arrayOrSingle).expressions;
} else exceptionNameNodes = new Expression[] { arrayOrSingle };
if ( exceptionNames.size() != exceptionNameNodes.length ) {
annotationNode.addError(
"LOMBOK BUG: The number of exception classes in the annotation isn't the same pre- and post- guessing.");
}
List<DeclaredException> exceptions = new ArrayList<DeclaredException>();
int idx = 0;
for ( String exceptionName : exceptionNames ) {
if ( exceptionName.endsWith(".class") ) exceptionName = exceptionName.substring(0, exceptionName.length() - 6);
exceptions.add(new DeclaredException(exceptionName, exceptionNameNodes[idx++]));
}
Node owner = annotationNode.up();
switch ( owner.getKind() ) {
// case FIELD:
// return handleField(annotationNode, (FieldDeclaration)owner.get(), exceptions);
case METHOD:
return handleMethod(annotationNode, (AbstractMethodDeclaration)owner.get(), exceptions);
default:
annotationNode.addError("@SneakyThrows is legal only on methods and constructors.");
return true;
}
}
// private boolean handleField(Node annotation, FieldDeclaration field, List<DeclaredException> exceptions) {
// if ( field.initialization == null ) {
// annotation.addError("@SneakyThrows can only be used on fields with an initialization statement.");
// return true;
// }
//
// Expression expression = field.initialization;
// Statement[] content = new Statement[] {new Assignment(
// new SingleNameReference(field.name, 0), expression, 0)};
// field.initialization = null;
//
// for ( DeclaredException exception : exceptions ) {
// content = new Statement[] { buildTryCatchBlock(content, exception) };
// }
//
// Block block = new Block(0);
// block.statements = content;
//
// Node typeNode = annotation.up().up();
//
// Initializer initializer = new Initializer(block, field.modifiers & Modifier.STATIC);
// initializer.sourceStart = expression.sourceStart;
// initializer.sourceEnd = expression.sourceEnd;
// initializer.declarationSourceStart = expression.sourceStart;
// initializer.declarationSourceEnd = expression.sourceEnd;
// injectField(typeNode, initializer);
//
// typeNode.rebuild();
//
// return true;
// }
private boolean handleMethod(Node annotation, AbstractMethodDeclaration method, List<DeclaredException> exceptions) {
if ( method.isAbstract() ) {
annotation.addError("@SneakyThrows can only be used on concrete methods.");
return true;
}
if ( method.statements == null ) return false;
Statement[] contents = method.statements;
for ( DeclaredException exception : exceptions ) {
contents = new Statement[] { buildTryCatchBlock(contents, exception) };
}
method.statements = contents;
annotation.up().rebuild();
return true;
}
private Statement buildTryCatchBlock(Statement[] contents, DeclaredException exception) {
TryStatement tryStatement = new TryStatement();
tryStatement.tryBlock = new Block(0);
tryStatement.tryBlock.statements = contents;
TypeReference typeReference;
if ( exception.exceptionName.indexOf('.') == -1 ) {
typeReference = new SingleTypeReference(exception.exceptionName.toCharArray(), exception.getPos());
} else {
String[] x = exception.exceptionName.split("\\.");
char[][] elems = new char[x.length][];
long[] poss = new long[x.length];
int start = (int)(exception.getPos() >> 32);
for ( int i = 0 ; i < x.length ; i++ ) {
elems[i] = x[i].trim().toCharArray();
int end = start + x[i].length();
poss[i] = (long)start << 32 | end;
start = end + 1;
}
typeReference = new QualifiedTypeReference(elems, poss);
}
Argument catchArg = new Argument("$ex".toCharArray(), exception.getPos(), typeReference, 0);
tryStatement.catchArguments = new Argument[] { catchArg };
MessageSend sneakyThrowStatement = new MessageSend();
sneakyThrowStatement.receiver = new QualifiedNameReference(new char[][] { "lombok".toCharArray(), "Lombok".toCharArray() }, new long[] { 0, 0 }, 0, 0);
sneakyThrowStatement.selector = "sneakyThrow".toCharArray();
sneakyThrowStatement.arguments = new Expression[] { new SingleNameReference("$ex".toCharArray(), 0) };
Statement rethrowStatement = new ThrowStatement(sneakyThrowStatement, 0, 0);
Block block = new Block(0);
block.statements = new Statement[] { rethrowStatement };
block.sourceStart = block.sourceEnd = -2;
tryStatement.catchBlocks = new Block[] { block };
return tryStatement;
}
}
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