/**
* Copyright (c) 2005-2011 by Appcelerator, Inc. All Rights Reserved.
* Licensed under the terms of the Eclipse Public License (EPL).
* Please see the license.txt included with this distribution for details.
* Any modifications to this file must keep this entire header intact.
*/
package com.python.pydev.refactoring.refactorer.search.copied;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.jface.viewers.AbstractTreeViewer;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.search.ui.text.AbstractTextSearchResult;
import org.eclipse.search.ui.text.Match;
import com.python.pydev.refactoring.refactorer.search.AbstractPythonSearchQuery;
import com.python.pydev.refactoring.refactorer.search.PythonFileSearchResult;
import com.python.pydev.ui.search.FileMatch;
import com.python.pydev.ui.search.LineElement;
public class FileTreeContentProvider implements ITreeContentProvider, IFileSearchContentProvider {
private final Object[] EMPTY_ARR = new Object[0];
private AbstractTextSearchResult fResult;
private FileSearchPage fPage;
private AbstractTreeViewer fTreeViewer;
private Map fChildrenMap;
FileTreeContentProvider(FileSearchPage page, AbstractTreeViewer viewer) {
fPage = page;
fTreeViewer = viewer;
}
public Object[] getElements(Object inputElement) {
Object[] children = getChildren(inputElement);
int elementLimit = getElementLimit();
if (elementLimit != -1 && elementLimit < children.length) {
Object[] limitedChildren = new Object[elementLimit];
System.arraycopy(children, 0, limitedChildren, 0, elementLimit);
return limitedChildren;
}
return children;
}
private int getElementLimit() {
try {
return fPage.getElementLimit().intValue();
} catch (Throwable e) {
// not available in eclipse 3.2
return 0;
}
}
public void dispose() {
// nothing to do
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if (newInput instanceof PythonFileSearchResult) {
initialize((PythonFileSearchResult) newInput);
}
}
private synchronized void initialize(AbstractTextSearchResult result) {
fResult = result;
fChildrenMap = new HashMap();
boolean showLineMatches = !((AbstractPythonSearchQuery) fResult.getQuery()).isFileNameSearch();
if (result != null) {
Object[] elements = result.getElements();
for (int i = 0; i < elements.length; i++) {
if (showLineMatches) {
Match[] matches = result.getMatches(elements[i]);
for (int j = 0; j < matches.length; j++) {
insert(((FileMatch) matches[j]).getLineElement(), false);
}
} else {
insert(elements[i], false);
}
}
}
}
private void insert(Object child, boolean refreshViewer) {
Object parent = getParent(child);
while (parent != null) {
if (insertChild(parent, child)) {
if (refreshViewer)
fTreeViewer.add(parent, child);
} else {
if (refreshViewer)
fTreeViewer.refresh(parent);
return;
}
child = parent;
parent = getParent(child);
}
if (insertChild(fResult, child)) {
if (refreshViewer)
fTreeViewer.add(fResult, child);
}
}
/**
* returns true if the child already was a child of parent.
*
* @param parent
* @param child
* @return Returns <code>trye</code> if the child was added
*/
private boolean insertChild(Object parent, Object child) {
Set children = (Set) fChildrenMap.get(parent);
if (children == null) {
children = new HashSet();
fChildrenMap.put(parent, children);
}
return children.add(child);
}
private boolean hasChild(Object parent, Object child) {
Set children = (Set) fChildrenMap.get(parent);
return children != null && children.contains(child);
}
private void remove(Object element, boolean refreshViewer) {
// precondition here: fResult.getMatchCount(child) <= 0
if (hasChildren(element)) {
if (refreshViewer)
fTreeViewer.refresh(element);
} else {
if (!hasMatches(element)) {
fChildrenMap.remove(element);
Object parent = getParent(element);
if (parent != null) {
removeFromSiblings(element, parent);
remove(parent, refreshViewer);
} else {
removeFromSiblings(element, fResult);
if (refreshViewer)
fTreeViewer.refresh();
}
} else {
if (refreshViewer) {
fTreeViewer.refresh(element);
}
}
}
}
private boolean hasMatches(Object element) {
if (element instanceof LineElement) {
LineElement lineElement = (LineElement) element;
return lineElement.getNumberOfMatches(fResult) > 0;
}
return fResult.getMatchCount(element) > 0;
}
private void removeFromSiblings(Object element, Object parent) {
Set siblings = (Set) fChildrenMap.get(parent);
if (siblings != null) {
siblings.remove(element);
}
}
public Object[] getChildren(Object parentElement) {
Set children = (Set) fChildrenMap.get(parentElement);
if (children == null)
return EMPTY_ARR;
return children.toArray();
}
public boolean hasChildren(Object element) {
return getChildren(element).length > 0;
}
/*
* (non-Javadoc)
* @see org.eclipse.search.internal.ui.text.IFileSearchContentProvider#elementsChanged(java.lang.Object[])
*/
public synchronized void elementsChanged(Object[] updatedElements) {
for (int i = 0; i < updatedElements.length; i++) {
if (!(updatedElements[i] instanceof LineElement)) {
// change events to elements are reported in file search
if (fResult.getMatchCount(updatedElements[i]) > 0)
insert(updatedElements[i], true);
else
remove(updatedElements[i], true);
} else {
// change events to line elements are reported in text search
LineElement lineElement = (LineElement) updatedElements[i];
int nMatches = lineElement.getNumberOfMatches(fResult);
if (nMatches > 0) {
if (hasChild(lineElement.getParent(), lineElement)) {
fTreeViewer.update(new Object[] { lineElement, lineElement.getParent() }, null);
} else {
insert(lineElement, true);
}
} else {
remove(lineElement, true);
}
}
}
}
public void clear() {
initialize(fResult);
fTreeViewer.refresh();
}
public Object getParent(Object element) {
if (element instanceof IProject)
return null;
if (element instanceof IResource) {
IResource resource = (IResource) element;
return resource.getParent();
}
if (element instanceof LineElement) {
return ((LineElement) element).getParent();
}
if (element instanceof FileMatch) {
FileMatch match = (FileMatch) element;
return match.getLineElement();
}
return null;
}
}