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SyntheticLinkingSupport.java
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SyntheticLinkingSupport.java
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/*******************************************************************************
* Copyright (c) 2014 itemis AG (http://www.itemis.eu) 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
*******************************************************************************/
package org.eclipse.xtext.linking.lazy;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.xtext.XtextFactory;
import org.eclipse.xtext.nodemodel.ICompositeNode;
import org.eclipse.xtext.nodemodel.INode;
import org.eclipse.xtext.nodemodel.impl.CompositeNode;
import org.eclipse.xtext.nodemodel.impl.LeafNode;
import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.parser.IParseResult;
import org.eclipse.xtext.resource.XtextResource;
import com.google.inject.Inject;
/**
* Provides services to install proxies without node model.
*
* @author Anton Kosyakov - Initial contribution and API
* @since 2.7
*/
public class SyntheticLinkingSupport {
@Inject
private LazyLinker lazyLinker;
public void createAndSetProxy(EObject obj, EReference eRef, String crossRefString) {
createAndSetProxy(obj, eRef, crossRefString, 0, 1);
}
/**
* @since 2.10
*/
public void createAndSetProxy(EObject obj, EReference eRef, String crossRefString, int offset, int length) {
INode crossReferenceNode = createCrossReferenceNode(obj, eRef, crossRefString, offset, length);
lazyLinker.createAndSetProxy(obj, crossReferenceNode, eRef);
}
/**
* @since 2.10
*/
protected INode createCrossReferenceNode(EObject obj, EReference eRef, String crossRefString, int offset, int length) {
CompositeNode parent = getParent(obj, eRef, crossRefString, offset, length);
EObject grammarElement = getGrammarElement(obj, eRef, crossRefString, offset, length);
return new SyntheticLinkingLeafNode(obj, crossRefString, offset, length, grammarElement, parent);
}
/**
* @since 2.10
*/
protected EObject getGrammarElement(EObject obj, EReference eRef, String crossRefString, int offset, int length) {
return XtextFactory.eINSTANCE.createKeyword();
}
/**
* @since 2.10
*/
protected CompositeNode getParent(EObject obj, EReference eRef, String crossRefString, int offset, int length) {
ICompositeNode node = NodeModelUtils.getNode(obj);
if (node != null) {
ICompositeNode rootNode = node.getRootNode();
if (rootNode instanceof CompositeNode)
return (CompositeNode) rootNode;
}
Resource resource = obj.eResource();
if (resource instanceof XtextResource) {
IParseResult parseResult = ((XtextResource) resource).getParseResult();
if (parseResult != null) {
ICompositeNode rootNode = parseResult.getRootNode();
if (rootNode instanceof CompositeNode)
return (CompositeNode) rootNode;
}
}
return null;
}
}
class SyntheticLinkingLeafNode extends LeafNode {
private final String text;
private final EObject semanticElement;
public SyntheticLinkingLeafNode(EObject semanticElement, String text, int offset, int length, EObject grammarElement, CompositeNode parent) {
this.text = text;
this.semanticElement = semanticElement;
basicSetTotalOffset(offset);
basicSetTotalLength(length);
basicSetGrammarElement(grammarElement);
basicSetParent(parent);
}
@Override
public String getText() {
return text;
}
@Override
public EObject getSemanticElement() {
return semanticElement;
}
@Override
protected EObject basicGetSemanticElement() {
return semanticElement;
}
@Override
protected boolean basicHasSiblings() {
return false;
}
@Override
protected boolean basicHasNextSibling() {
return false;
}
@Override
protected boolean basicHasPreviousSibling() {
return false;
}
}