/*******************************************************************************
* Copyright (c) 2005, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.debug.core;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.model.ISourceLocator;
import org.eclipse.debug.core.sourcelookup.ISourceLookupDirector;
import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTParser;
import org.eclipse.jdt.core.dom.ASTVisitor;
import org.eclipse.jdt.core.dom.AnonymousClassDeclaration;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.TypeDeclaration;
import org.eclipse.jdt.debug.core.IJavaReferenceType;
import org.eclipse.jdt.debug.core.IJavaStackFrame;
import org.eclipse.jdt.debug.core.IJavaThread;
import org.eclipse.jdt.debug.core.IJavaType;
import org.eclipse.jdt.debug.core.IJavaValue;
import com.sun.jdi.VMDisconnectedException;
/**
* A Utilities class.
*
* @since 3.2
*/
public class JavaDebugUtils {
/**
* Resolves and returns a type from the Java model that corresponds to the
* declaring type of the given stack frame, or <code>null</code> if none.
*
* @param frame
* frame to resolve declaring type for
* @return corresponding Java model type or <code>null</code>
* @exception CoreException
* if an exception occurs during the resolution
* @since 3.2
*/
public static IType resolveDeclaringType(IJavaStackFrame frame)
throws CoreException {
IJavaElement javaElement = resolveJavaElement(frame, frame.getLaunch());
if (javaElement != null) {
return resolveType(frame.getDeclaringTypeName(), javaElement);
}
return null;
}
/**
* Resolves and returns a type from the Java model that corresponds to the
* type of the given value, or <code>null</code> if none.
*
* @param value
* value to resolve type for
* @return corresponding Java model type or <code>null</code>
* @exception CoreException
* if an exception occurs during the resolution
*/
public static IType resolveType(IJavaValue value) throws CoreException {
IJavaElement javaElement = resolveJavaElement(value, value.getLaunch());
if (javaElement != null) {
return resolveType(value.getJavaType().getName(), javaElement);
}
return null;
}
/**
* Resolves and returns the Java model type associated with the given Java
* debug type, or <code>null</code> if none.
*
* @param type
* Java debug model type
* @return Java model type or <code>null</code>
* @throws CoreException if resolving the type fails
*/
public static IType resolveType(IJavaType type) throws CoreException {
IJavaElement element = resolveJavaElement(type, type.getLaunch());
if (element != null) {
return resolveType(type.getName(), element);
}
return null;
}
/**
* Returns the source name associated with the given object, or
* <code>null</code> if none.
*
* @param object
* an object with an <code>IJavaStackFrame</code> adapter, an
* IJavaValue or an IJavaType
* @return the source name associated with the given object, or
* <code>null</code> if none
* @exception CoreException
* if unable to retrieve the source name
*/
public static String getSourceName(Object object) throws CoreException {
if (object instanceof String) {
// assume it's a file name
return (String) object;
}
IJavaStackFrame frame = null;
if (object instanceof IAdaptable) {
frame = (IJavaStackFrame) ((IAdaptable) object)
.getAdapter(IJavaStackFrame.class);
}
String typeName = null;
try {
if (frame != null) {
if (frame.isObsolete()) {
return null;
}
String sourceName = frame.getSourcePath();
// TODO: this may break fix to bug 21518
if (sourceName == null) {
// no debug attributes, guess at source name
typeName = frame.getDeclaringTypeName();
} else {
return sourceName;
}
} else {
if (object instanceof IJavaValue) {
// look at its type
object = ((IJavaValue) object).getJavaType();
}
if (object instanceof IJavaReferenceType) {
IJavaReferenceType refType = (IJavaReferenceType) object;
String[] sourcePaths = refType.getSourcePaths(null);
if (sourcePaths != null && sourcePaths.length > 0) {
return sourcePaths[0];
}
}
if (object instanceof IJavaType) {
typeName = ((IJavaType) object).getName();
}
}
} catch (DebugException e) {
int code = e.getStatus().getCode();
if (code == IJavaThread.ERR_THREAD_NOT_SUSPENDED
|| code == IJavaStackFrame.ERR_INVALID_STACK_FRAME
|| e.getStatus().getException() instanceof VMDisconnectedException) {
return null;
}
throw e;
}
if (typeName != null) {
return generateSourceName(typeName);
}
return null;
}
/**
* Generates and returns a source file path based on a qualified type name.
* For example, when <code>java.lang.String</code> is provided, the returned
* source name is <code>java/lang/String.java</code>.
*
* @param qualifiedTypeName
* fully qualified type name that may contain inner types denoted
* with <code>$</code> character
* @return a source file path corresponding to the type name
*/
public static String generateSourceName(String qualifiedTypeName) {
int index = qualifiedTypeName.lastIndexOf('.');
if (index < 0) {
index = 0;
}
qualifiedTypeName = qualifiedTypeName.replace('.', File.separatorChar);
index = qualifiedTypeName.indexOf('$');
if (index >= 0) {
qualifiedTypeName = qualifiedTypeName.substring(0, index);
}
if (qualifiedTypeName.length() == 0) {
// likely a proxy class (see bug 40815)
qualifiedTypeName = null;
} else {
qualifiedTypeName = qualifiedTypeName + ".java"; //$NON-NLS-1$
}
return qualifiedTypeName;
}
/**
* Resolves the type corresponding to the given name contained in the given
* top-level Java element (class file, compilation unit, or type).
*
* @param qualifiedName
* fully qualified type name
* @param javaElement
* java element containing the type
* @return type
*/
private static IType resolveType(final String qualifiedName,
IJavaElement javaElement) {
IType type = null;
String[] typeNames = getNestedTypeNames(qualifiedName);
if (javaElement instanceof IClassFile) {
type = ((IClassFile) javaElement).getType();
} else if (javaElement instanceof ICompilationUnit) {
type = ((ICompilationUnit) javaElement).getType(typeNames[0]);
} else if (javaElement instanceof IType) {
type = (IType) javaElement;
}
if (type != null) {
for (int i = 1; i < typeNames.length; i++) {
String innerTypeName = typeNames[i];
class ResultException extends RuntimeException {
private static final long serialVersionUID = 1L;
private final IType fResult;
public ResultException(IType result) {
fResult = result;
}
}
if (innerTypeName.length() > 0) {
try {
Integer.parseInt(innerTypeName.substring(0, 1)); // throws
// NFE
// if
// not
// an
// integer
// perform expensive lookup for anonymous types:
ASTParser parser = ASTParser.newParser(AST.JLS4);
parser.setResolveBindings(true);
parser.setSource(type.getTypeRoot());
CompilationUnit cu = (CompilationUnit) parser
.createAST(null);
cu.accept(new ASTVisitor(false) {
@Override
public boolean visit(AnonymousClassDeclaration node) {
ITypeBinding binding = node.resolveBinding();
if (binding == null)
return false;
if (qualifiedName.equals(binding
.getBinaryName()))
throw new ResultException((IType) binding
.getJavaElement());
return true;
}
@Override
public boolean visit(TypeDeclaration node) {
ITypeBinding binding = node.resolveBinding();
if (binding == null)
return false;
if (qualifiedName.equals(binding
.getBinaryName()))
throw new ResultException((IType) binding
.getJavaElement());
return true;
}
});
return type; // return enclosing type if exact type not
// found
} catch (NumberFormatException e) {
// normal nested type, continue
} catch (IllegalStateException e) {
return type; // binary class without source
} catch (ResultException e) {
return e.fResult;
}
}
type = type.getType(innerTypeName);
}
}
return type;
}
/**
* Returns the Java element corresponding to the given object or
* <code>null</code> if none, in the context of the given launch.
*
* @param launch
* provides source locator
* @param object
* object to resolve Java model element for
* @return corresponding Java element or <code>null</code>
* @throws CoreException if an exception occurs
*/
public static IJavaElement resolveJavaElement(Object object, ILaunch launch)
throws CoreException {
Object sourceElement = resolveSourceElement(object, launch);
return getJavaElement(sourceElement);
}
/**
* Returns the {@link IJavaElement} associated with the given source element
* or <code>null</code> if none.
*
* @param sourceElement
* a java element, object that adapts to a java element, or a
* resource
* @return corresponding {@link IJavaElement} or <code>null</code>
* @since 3.4.0
*/
public static IJavaElement getJavaElement(Object sourceElement) {
IJavaElement javaElement = null;
if (sourceElement instanceof IJavaElement) {
javaElement = (IJavaElement) sourceElement;
} else if (sourceElement instanceof IAdaptable) {
javaElement = (IJavaElement) ((IAdaptable) sourceElement)
.getAdapter(IJavaElement.class);
}
if (javaElement == null && sourceElement instanceof IResource) {
javaElement = JavaCore.create((IResource) sourceElement);
}
if (javaElement == null) {
return null;
}
if (!javaElement.exists()) {
return null;
}
return javaElement;
}
/**
* Returns the source element corresponding to the given object or
* <code>null</code> if none, in the context of the given launch.
*
* @param launch
* provides source locator
* @param object
* object to resolve source element for
* @return corresponding source element or <code>null</code>
* @throws CoreException if an exception occurs
*/
public static Object resolveSourceElement(Object object, ILaunch launch)
throws CoreException {
ISourceLocator sourceLocator = launch.getSourceLocator();
if (sourceLocator instanceof ISourceLookupDirector) {
ISourceLookupDirector director = (ISourceLookupDirector) sourceLocator;
Object[] objects = director.findSourceElements(object);
if (objects.length > 0) {
return objects[0];
}
}
return null;
}
/**
* Returns an array of simple type names that are part of the given type's
* qualified name. For example, if the given name is <code>x.y.A$B</code>,
* an array with <code>["A", "B"]</code> is returned.
*
* @param typeName
* fully qualified type name
* @return array of nested type names
*/
private static String[] getNestedTypeNames(String typeName) {
int index = typeName.lastIndexOf('.');
if (index >= 0) {
typeName = typeName.substring(index + 1);
}
index = typeName.indexOf('$');
List<String> list = new ArrayList<String>(1);
while (index >= 0) {
list.add(typeName.substring(0, index));
typeName = typeName.substring(index + 1);
index = typeName.indexOf('$');
}
list.add(typeName);
return list.toArray(new String[list.size()]);
}
/**
* Returns the class file or compilation unit containing the given fully
* qualified name in the specified project. All registered java like file
* extensions are considered.
*
* @param qualifiedTypeName
* fully qualified type name
* @param project
* project to search in
* @return class file or compilation unit or <code>null</code>
* @throws CoreException if an exception occurs
*/
public static IJavaElement findElement(String qualifiedTypeName, IJavaProject project) throws CoreException {
String[] javaLikeExtensions = JavaCore.getJavaLikeExtensions();
String path = qualifiedTypeName;
int pos = path.indexOf('$');
if (pos != -1) {
path = path.substring(0, pos);
}
path = path.replace('.', IPath.SEPARATOR);
path += "."; //$NON-NLS-1$
for (String ext : javaLikeExtensions) {
IJavaElement element = project.findElement(new Path(path + ext));
if (element != null) {
return element;
}
}
return null;
}
}