/*******************************************************************************
* Copyright (c) 2001, 2010 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
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.xml.core.internal.document;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegionList;
import org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMElement;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMNode;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMText;
import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext;
import org.w3c.dom.Node;
class ReadOnlyController {
class Span {
int length;
int offset;
Span(int offset, int length) {
this.offset = offset;
this.length = length;
}
}
private static ReadOnlyController fInstance;
static synchronized ReadOnlyController getInstance() {
if (fInstance == null) {
fInstance = new ReadOnlyController();
}
return fInstance;
}
static private void lock(IStructuredDocument doc, int offset, int length, boolean canInsertBefore, boolean canInsertAfter) {
if (doc == null) {
return;
}
if (doc instanceof BasicStructuredDocument) {
((BasicStructuredDocument)doc).makeReadOnly(offset, length, canInsertBefore, canInsertAfter);
} else {
doc.makeReadOnly(offset, length);
}
}
static private void lock(IStructuredDocumentRegion node, boolean canInsertBefore, boolean canInsertAfter) {
if (node == null) {
return;
}
IStructuredDocument doc = node.getParentDocument();
if (doc == null) {
return;
}
if (doc instanceof BasicStructuredDocument) {
((BasicStructuredDocument)doc).makeReadOnly(node.getStart(), node.getLength(), canInsertBefore, canInsertAfter);
} else {
doc.makeReadOnly(node.getStart(), node.getLength());
}
}
static private void unlock(IStructuredDocumentRegion node) {
if (node == null) {
return;
}
IStructuredDocument doc = node.getParentDocument();
if (doc == null) {
return;
}
doc.clearReadOnly(node.getStart(), node.getLength());
}
private ReadOnlyController() {
super();
}
private Span getDataSpan(IDOMNode node) {
switch (node.getNodeType()) {
case Node.ELEMENT_NODE :
return getDataSpanForElement((IDOMElement) node);
case Node.TEXT_NODE :
return getDataSpanForText((IDOMText) node);
default :
return new Span(0, -1);
}
}
private Span getDataSpanForElement(IDOMElement node) {
IStructuredDocumentRegion docRegion = node.getStartStructuredDocumentRegion();
if (docRegion == null) {
return new Span(0, -1);
}
ITextRegionList regions = docRegion.getRegions();
if (regions == null) {
return new Span(0, -1);
}
String startType;
String endType;
if (node.isCommentTag()) {
startType = DOMRegionContext.XML_COMMENT_OPEN;
endType = DOMRegionContext.XML_COMMENT_CLOSE;
} else {
startType = DOMRegionContext.XML_TAG_NAME;
endType = DOMRegionContext.XML_TAG_CLOSE;
}
int startOffset = -1;
int endOffset = -1;
ITextRegion prevRegion = null;
ITextRegion region;
for (int i = 0; i < regions.size(); i++) {
region = regions.get(i);
String type = region.getType();
if (type == startType) {
startOffset = region.getEnd();
} else if (type == endType && prevRegion != null) {
endOffset = prevRegion.getTextEnd();
}
prevRegion = region;
}
if (0 <= startOffset && 0 <= endOffset) {
return new Span(startOffset, endOffset - startOffset);
} else {
return new Span(0, -1);
}
}
private Span getDataSpanForText(IDOMText node) {
IStructuredDocumentRegion docRegion = ((NodeImpl) node).getStructuredDocumentRegion();
if (docRegion == null) {
return new Span(0, -1);
}
return new Span(0, docRegion.getLength());
}
/**
* This method is used from parent's setChildEditable()
*
* case 1:<parent><node attr="value"/> <node2></parent>
* x####################x case 2:<parent><node attr="value"> <child>
* </child> </node> </parent> x###################? ?#######x (? :
* editable if node.isEditable() == true)
*/
void lockBoth(IDOMNode node) {
if (node == null) {
return;
}
IStructuredDocumentRegion flatNode;
boolean canInsert = false;
// end node (element)
if (node.getNodeType() == Node.ELEMENT_NODE) {
flatNode = node.getEndStructuredDocumentRegion();
if (flatNode != null) {
canInsert = node.isChildEditable();
lock(flatNode, canInsert, false);
}
}
// start node
flatNode = node.getStartStructuredDocumentRegion();
if (flatNode != null) {
lock(flatNode, false, canInsert);
}
}
void lockData(IDOMNode node) {
if (node == null) {
return;
}
Span span = getDataSpan(node);
if (0 <= span.length) {
lock(node.getModel().getStructuredDocument(), node.getStartOffset() + span.offset, span.length, false, false);
}
}
/**
* lock itself and all descendants
*/
void lockDeep(IDOMNode node) {
if (node == null) {
return;
}
int offset = node.getStartOffset();
int length = node.getEndOffset() - offset;
boolean canInsert = true;
IDOMNode parent = (IDOMNode) node.getParentNode();
if (parent != null && !parent.isChildEditable()) {
canInsert = false;
}
lock(node.getStructuredDocument(), offset, length, canInsert, canInsert);
}
/**
* This method is used from parent's setChildEditable()
*
* case 1:<parent><node attr="value"/> <node2></parent> x######x x##x
* case 2:<parent><node attr="value"> <child></child> </node> </parent>
* x######x x#? ?#######x (? : editable if node.isEditable() == true)
*/
void lockNode(IDOMNode node) {
if (node == null) {
return;
}
if (!node.isDataEditable()) {
lockBoth(node);
return;
}
IStructuredDocumentRegion flatNode;
boolean canInsert = false;
// end node (element)
if (node.getNodeType() == Node.ELEMENT_NODE) {
flatNode = node.getEndStructuredDocumentRegion();
if (flatNode != null) {
canInsert = node.isChildEditable();
lock(flatNode, canInsert, false);
}
}
// start node
flatNode = node.getStartStructuredDocumentRegion();
if (flatNode != null) {
Span span = getDataSpan(node);
if (0 <= span.length) {
IStructuredDocument structuredDocument = flatNode.getParentDocument();
int offset, length;
offset = flatNode.getStart();
length = span.offset;
lock(structuredDocument, offset, length, false, false);
offset = offset + span.offset + span.length;
length = flatNode.getEnd() - offset;
lock(structuredDocument, offset, length, false, canInsert);
} else {
lock(flatNode, false, canInsert);
}
}
}
private void unlock(IStructuredDocument doc, int offset, int length) {
if (doc == null) {
return;
}
doc.clearReadOnly(offset, length);
}
void unlockBoth(IDOMNode node) {
if (node == null) {
return;
}
IStructuredDocumentRegion flatNode;
// start node
flatNode = node.getStartStructuredDocumentRegion();
if (flatNode != null) {
unlock(flatNode);
}
// end node
flatNode = node.getEndStructuredDocumentRegion();
if (flatNode != null) {
unlock(flatNode);
}
}
void unlockData(IDOMNode node) {
if (node == null) {
return;
}
Span span = getDataSpan(node);
if (0 <= span.length) {
unlock(node.getModel().getStructuredDocument(), span.offset, span.length);
}
}
void unlockDeep(IDOMNode node) {
if (node == null) {
return;
}
int offset = node.getStartOffset();
int length = node.getEndOffset() - offset;
unlock(node.getStructuredDocument(), offset, length);
}
void unlockNode(IDOMNode node) {
if (node == null) {
return;
}
IStructuredDocumentRegion flatNode;
// end node
if (node.getNodeType() == Node.ELEMENT_NODE) {
flatNode = node.getEndStructuredDocumentRegion();
if (flatNode != null) {
unlock(flatNode);
}
}
// start node
flatNode = node.getStartStructuredDocumentRegion();
if (flatNode != null) {
if (node.isDataEditable()) {
unlock(flatNode);
} else {
Span span = getDataSpan(node);
if (span.length <= 0) {
unlock(flatNode);
} else {
IStructuredDocument structuredDocument = flatNode.getParentDocument();
int offset, length;
offset = flatNode.getStart();
length = span.offset - offset;
unlock(structuredDocument, offset, length);
offset = span.offset + span.length;
length = flatNode.getEnd() - span.offset;
unlock(structuredDocument, offset, length);
}
}
}
}
}