null if this
* element does not have a parent.
*/
protected IJavaElement parent;
/**
* This element's name, or an empty String if this
* element does not have a name.
*/
protected String name;
protected static final Object NO_INFO = new Object();
/**
* Constructs a handle for a java element with
* the given parent element and name.
*
* @param parent The parent of java element
* @param name The name of java element
*
* @exception IllegalArgumentException if the type is not one of the valid
* Java element type constants
*
*/
protected JavaElement(JavaElement parent, String name) throws IllegalArgumentException {
this.parent = parent;
this.name = name;
}
/**
* @see IOpenable
*/
public void close() throws JavaModelException {
JavaModelManager.getJavaModelManager().removeInfoAndChildren(this);
}
/**
* This element is being closed. Do any necessary cleanup.
*/
protected abstract void closing(Object info) throws JavaModelException;
/*
* Returns a new element info for this element.
*/
protected abstract Object createElementInfo();
/**
* Returns true if this handle represents the same Java element
* as the given handle. By default, two handles represent the same
* element if they are identical or if they represent the same type
* of element, have equal names, parents, and occurrence counts.
*
* If a subclass has other requirements for equality, this method
* must be overridden.
*
* @see Object#equals
*/
public boolean equals(Object o) {
if (this == o) return true;
// Java model parent is null
if (this.parent == null) return super.equals(o);
// assume instanceof check is done in subclass
JavaElement other = (JavaElement) o;
return this.occurrenceCount == other.occurrenceCount &&
this.name.equals(other.name) &&
this.parent.equals(other.parent);
}
/**
* Returns true if this JavaElement is equivalent to the given
* IDOMNode.
*/
protected boolean equalsDOMNode(IDOMNode node) throws JavaModelException {
return false;
}
/**
* @see IJavaElement
*/
public boolean exists() {
try {
getElementInfo();
return true;
} catch (JavaModelException e) {
}
return false;
}
/**
* Returns the IDOMNode that corresponds to this JavaElement
* or null if there is no corresponding node.
*/
public IDOMNode findNode(IDOMCompilationUnit dom) {
int type = getElementType();
if (type == IJavaElement.COMPILATION_UNIT ||
type == IJavaElement.FIELD ||
type == IJavaElement.IMPORT_DECLARATION ||
type == IJavaElement.INITIALIZER ||
type == IJavaElement.METHOD ||
type == IJavaElement.PACKAGE_DECLARATION ||
type == IJavaElement.TYPE) {
ArrayList path = new ArrayList();
IJavaElement element = this;
while (element != null && element.getElementType() != IJavaElement.COMPILATION_UNIT) {
if (element.getElementType() != IJavaElement.IMPORT_CONTAINER) {
// the DOM does not have import containers, so skip them
path.add(0, element);
}
element = element.getParent();
}
if (path.size() == 0) {
try {
if (equalsDOMNode(dom)) {
return dom;
} else {
return null;
}
} catch(JavaModelException e) {
return null;
}
}
return ((JavaElement) path.get(0)).followPath(path, 0, dom.getFirstChild());
} else {
return null;
}
}
/**
*/
protected IDOMNode followPath(ArrayList path, int position, IDOMNode node) {
try {
if (equalsDOMNode(node)) {
if (position == (path.size() - 1)) {
return node;
} else {
if (node.getFirstChild() != null) {
position++;
return ((JavaElement)path.get(position)).followPath(path, position, node.getFirstChild());
} else {
return null;
}
}
} else if (node.getNextNode() != null) {
return followPath(path, position, node.getNextNode());
} else {
return null;
}
} catch (JavaModelException e) {
return null;
}
}
/**
* @see IJavaElement
*/
public IJavaElement getAncestor(int ancestorType) {
IJavaElement element = this;
while (element != null) {
if (element.getElementType() == ancestorType) return element;
element= element.getParent();
}
return null;
}
/**
* Generates the element infos for this element, its ancestors (if they are not opened) and its children (if it is an Openable).
* Puts the newly created element info in the given map.
*/
protected abstract void generateInfos(Object info, HashMap newElements, IProgressMonitor pm) throws JavaModelException;
/**
* @see IParent
*/
public IJavaElement[] getChildren() throws JavaModelException {
return ((JavaElementInfo)getElementInfo()).getChildren();
}
/**
* Returns a collection of (immediate) children of this node of the
* specified type.
*
* @param type - one of constants defined by IJavaLanguageElementTypes
*/
public ArrayList getChildrenOfType(int type) throws JavaModelException {
IJavaElement[] children = getChildren();
int size = children.length;
ArrayList list = new ArrayList(size);
for (int i = 0; i < size; ++i) {
JavaElement elt = (JavaElement)children[i];
if (elt.getElementType() == type) {
list.add(elt);
}
}
return list;
}
/**
* @see IMember
*/
// public IClassFile getClassFile() {
// return null;
// }
/**
* @see IMember
*/
public ICompilationUnit getCompilationUnit() {
return null;
}
/**
* Returns the info for this handle.
* If this element is not already open, it and all of its parents are opened.
* Does not return null.
* NOTE: BinaryType infos are NOT rooted under JavaElementInfo.
* @exception JavaModelException if the element is not present or not accessible
*/
public Object getElementInfo() throws JavaModelException {
return getElementInfo(null);
}
/**
* Returns the info for this handle.
* If this element is not already open, it and all of its parents are opened.
* Does not return null.
* NOTE: BinaryType infos are NOT rooted under JavaElementInfo.
* @exception JavaModelException if the element is not present or not accessible
*/
public Object getElementInfo(IProgressMonitor monitor) throws JavaModelException {
JavaModelManager manager = JavaModelManager.getJavaModelManager();
Object info = manager.getInfo(this);
if (info != null) return info;
return openWhenClosed(createElementInfo(), monitor);
}
/**
* @see IAdaptable
*/
public String getElementName() {
return name;
}
/**
* @see IJavaElement
*/
public String getHandleIdentifier() {
return getHandleMemento();
}
/**
* @see JavaElement#getHandleMemento()
*/
public String getHandleMemento(){
StringBuffer buff= new StringBuffer(((JavaElement)getParent()).getHandleMemento());
buff.append(getHandleMementoDelimiter());
buff.append(getElementName());
return buff.toString();
}
/**
* Returns the char that marks the start of this handles
* contribution to a memento.
*/
protected abstract char getHandleMementoDelimiter();
/**
* @see IJavaElement
*/
public IJavaModel getJavaModel() {
IJavaElement current = this;
do {
if (current instanceof IJavaModel) return (IJavaModel) current;
} while ((current = current.getParent()) != null);
return null;
}
/**
* @see IJavaElement
*/
public IJavaProject getJavaProject() {
IJavaElement current = this;
do {
if (current instanceof IJavaProject) return (IJavaProject) current;
} while ((current = current.getParent()) != null);
return null;
}
/**
* Returns the occurrence count of the handle.
*/
protected int getOccurrenceCount() {
return occurrenceCount;
}
/*
* @see IJavaElement
*/
public IOpenable getOpenable() {
return this.getOpenableParent();
}
/**
* Return the first instance of IOpenable in the parent
* hierarchy of this element.
*
*
Subclasses that are not IOpenable's must override this method.
*/
public IOpenable getOpenableParent() {
return (IOpenable)parent;
}
/**
* @see IJavaElement
*/
public IJavaElement getParent() {
return parent;
}
/*
* @see IJavaElement#getPrimaryElement()
*/
public IJavaElement getPrimaryElement() {
return getPrimaryElement(true);
}
/*
* Returns the primary element. If checkOwner, and the cu owner is primary,
* return this element.
*/
public IJavaElement getPrimaryElement(boolean checkOwner) {
return this;
}
/**
* Returns the element that is located at the given source position
* in this element. This is a helper method for ICompilationUnit#getElementAt,
* and only works on compilation units and types. The position given is
* known to be within this element's source range already, and if no finer
* grained element is found at the position, this element is returned.
*/
protected IJavaElement getSourceElementAt(int position) throws JavaModelException {
if (this instanceof ISourceReference) {
IJavaElement[] children = getChildren();
int i;
for (i = 0; i < children.length; i++) {
IJavaElement aChild = children[i];
if (aChild instanceof SourceRefElement) {
SourceRefElement child = (SourceRefElement) children[i];
ISourceRange range = child.getSourceRange();
if (position < range.getOffset() + range.getLength() && position >= range.getOffset()) {
if (child instanceof IParent) {
return child.getSourceElementAt(position);
} else {
return child;
}
}
}
}
} else {
// should not happen
Assert.isTrue(false);
}
return this;
}
/**
* Returns the SourceMapper facility for this element, or
* null if this element does not have a
* SourceMapper.
*/
// public SourceMapper getSourceMapper() {
// return ((JavaElement)getParent()).getSourceMapper();
// }
/* (non-Javadoc)
* @see org.eclipse.jdt.core.IJavaElement#getSchedulingRule()
*/
public ISchedulingRule getSchedulingRule() {
IResource resource = getResource();
if (resource == null) {
class NoResourceSchedulingRule implements ISchedulingRule {
public IPath path;
public NoResourceSchedulingRule(IPath path) {
this.path = path;
}
public boolean contains(ISchedulingRule rule) {
if (rule instanceof NoResourceSchedulingRule) {
return this.path.isPrefixOf(((NoResourceSchedulingRule)rule).path);
} else {
return false;
}
}
public boolean isConflicting(ISchedulingRule rule) {
if (rule instanceof NoResourceSchedulingRule) {
IPath otherPath = ((NoResourceSchedulingRule)rule).path;
return this.path.isPrefixOf(otherPath) || otherPath.isPrefixOf(this.path);
} else {
return false;
}
}
}
return new NoResourceSchedulingRule(getPath());
} else {
return resource;
}
}
/**
* @see IParent
*/
public boolean hasChildren() throws JavaModelException {
// if I am not open, return true to avoid opening (case of a Java project, a compilation unit or a class file).
// also see https://bugs.eclipse.org/bugs/show_bug.cgi?id=52474
Object elementInfo = JavaModelManager.getJavaModelManager().getInfo(this);
if (elementInfo instanceof JavaElementInfo) {
return ((JavaElementInfo)elementInfo).getChildren().length > 0;
} else {
return true;
}
}
/**
* Returns the hash code for this Java element. By default,
* the hash code for an element is a combination of its name
* and parent's hash code. Elements with other requirements must
* override this method.
*/
public int hashCode() {
if (this.parent == null) return super.hashCode();
return Util.combineHashCodes(this.name.hashCode(), this.parent.hashCode());
}
/**
* Returns true if this element is an ancestor of the given element,
* otherwise false.
*/
protected boolean isAncestorOf(IJavaElement e) {
IJavaElement parent= e.getParent();
while (parent != null && !parent.equals(this)) {
parent= parent.getParent();
}
return parent != null;
}
/**
* @see IJavaElement
*/
public boolean isReadOnly() {
return false;
}
/**
* @see IJavaElement
*/
public boolean isStructureKnown() throws JavaModelException {
return ((JavaElementInfo)getElementInfo()).isStructureKnown();
}
/**
* Creates and returns and not present exception for this element.
*/
protected JavaModelException newNotPresentException() {
return new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.ELEMENT_DOES_NOT_EXIST, this));
}
/**
* Opens this element and all parents that are not already open.
*
* @exception JavaModelException this element is not present or accessible
*/
// protected void openHierarchy() throws JavaModelException {
// if (this instanceof IOpenable) {
// ((Openable) this).openWhenClosed(null);
// } else {
// Openable openableParent = (Openable)getOpenableParent();
// if (openableParent != null) {
// JavaElementInfo openableParentInfo = (JavaElementInfo) JavaModelManager.getJavaModelManager().getInfo((IJavaElement) openableParent);
// if (openableParentInfo == null) {
// openableParent.openWhenClosed(null);
// } else {
// throw newNotPresentException();
// }
// }
// }
// }
/**
* This element has just been opened. Do any necessary setup.
*/
protected void opening(Object info) {
}
/*
* Opens an Openable that is known to be closed (no check for isOpen()).
* Returns the created element info.
*/
protected Object openWhenClosed(Object info, IProgressMonitor monitor) throws JavaModelException {
JavaModelManager manager = JavaModelManager.getJavaModelManager();
boolean hadTemporaryCache = manager.hasTemporaryCache();
try {
HashMap newElements = manager.getTemporaryCache();
generateInfos(info, newElements, monitor);
if (info == null) {
info = newElements.get(this);
}
if (info == null) { // a source ref element could not be opened
// close any buffer that was opened for the openable parent
Iterator iterator = newElements.keySet().iterator();
while (iterator.hasNext()) {
IJavaElement element = (IJavaElement)iterator.next();
if (element instanceof Openable) {
((Openable)element).closeBuffer();
}
}
throw newNotPresentException();
}
if (!hadTemporaryCache) {
manager.putInfos(this, newElements);
}
} finally {
if (!hadTemporaryCache) {
manager.resetTemporaryCache();
}
}
return info;
}
/**
*/
public String readableName() {
return this.getElementName();
}
/**
* Removes all cached info from the Java Model, including all children,
* but does not close this element.
*/
// protected void removeInfo() {
// Object info = JavaModelManager.getJavaModelManager().peekAtInfo(this);
// if (info != null) {
// if (this instanceof IParent) {
// IJavaElement[] children = ((JavaElementInfo)info).getChildren();
// for (int i = 0, size = children.length; i < size; ++i) {
// JavaElement child = (JavaElement) children[i];
// child.removeInfo();
// }
// }
// JavaModelManager.getJavaModelManager().removeInfo(this);
// }
// }
// /**
// * Returns a copy of this element rooted at the given project.
// */
// public abstract IJavaElement rootedAt(IJavaProject project);
/**
* Runs a Java Model Operation
*/
public static void runOperation(JavaModelOperation operation, IProgressMonitor monitor) throws JavaModelException {
try {
if (operation.isReadOnly() || ResourcesPlugin.getWorkspace().isTreeLocked()) {
operation.run(monitor);
} else {
// use IWorkspace.run(...) to ensure that a build will be done in autobuild mode
ResourcesPlugin.getWorkspace().run(operation, monitor);
}
} catch (CoreException ce) {
if (ce instanceof JavaModelException) {
throw (JavaModelException)ce;
} else {
if (ce.getStatus().getCode() == IResourceStatus.OPERATION_FAILED) {
Throwable e= ce.getStatus().getException();
if (e instanceof JavaModelException) {
throw (JavaModelException) e;
}
}
throw new JavaModelException(ce);
}
}
}
/**
* Sets the occurrence count of the handle.
*/
protected void setOccurrenceCount(int count) {
occurrenceCount = count;
}
protected String tabString(int tab) {
StringBuffer buffer = new StringBuffer();
for (int i = tab; i > 0; i--)
buffer.append(" "); //$NON-NLS-1$
return buffer.toString();
}
/**
* Debugging purposes
*/
public String toDebugString() {
StringBuffer buffer = new StringBuffer();
this.toStringInfo(0, buffer, NO_INFO);
return buffer.toString();
}
/**
* Debugging purposes
*/
public String toString() {
StringBuffer buffer = new StringBuffer();
toString(0, buffer);
return buffer.toString();
}
/**
* Debugging purposes
*/
protected void toString(int tab, StringBuffer buffer) {
// Object info = this.toStringInfo(tab, buffer);
Object info = null;
if (tab == 0) {
this.toStringAncestors(buffer);
}
this.toStringChildren(tab, buffer, info);
}
/**
* Debugging purposes
*/
public String toStringWithAncestors() {
StringBuffer buffer = new StringBuffer();
this.toStringInfo(0, buffer, NO_INFO);
this.toStringAncestors(buffer);
return buffer.toString();
}
/**
* Debugging purposes
*/
protected void toStringAncestors(StringBuffer buffer) {
JavaElement parent = (JavaElement)this.getParent();
if (parent != null && parent.getParent() != null) {
buffer.append(" [in "); //$NON-NLS-1$
parent.toStringInfo(0, buffer, NO_INFO);
parent.toStringAncestors(buffer);
buffer.append("]"); //$NON-NLS-1$
}
}
/**
* Debugging purposes
*/
protected void toStringChildren(int tab, StringBuffer buffer, Object info) {
if (info == null || !(info instanceof JavaElementInfo)) return;
IJavaElement[] children = ((JavaElementInfo)info).getChildren();
for (int i = 0; i < children.length; i++) {
buffer.append("\n"); //$NON-NLS-1$
((JavaElement)children[i]).toString(tab + 1, buffer);
}
}
/**
* Debugging purposes
*/
// public Object toStringInfo(int tab, StringBuffer buffer) {
// Object info = JavaModelManager.getJavaModelManager().peekAtInfo(this);
// this.toStringInfo(tab, buffer, info);
// return info;
// }
/**
* Debugging purposes
*/
protected void toStringInfo(int tab, StringBuffer buffer, Object info) {
buffer.append(this.tabString(tab));
buffer.append(getElementName());
if (info == null) {
buffer.append(" (not open)"); //$NON-NLS-1$
}
}
}