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[node model][performance] NodeModelBuilder#compressAndReturnParent()

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see https://bugs.eclipse.org/bugs/show_bug.cgi?id=376607
This commit is contained in:
Knut Wannheden 2012-04-12 16:53:30 +02:00
parent afc7879e29
commit 7dec6c607b
1 changed files with 31 additions and 15 deletions
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46
plugins/org.eclipse.xtext/src/org/eclipse/xtext/nodemodel/impl/NodeModelBuilder.java
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@ -7,9 +7,10 @@
*******************************************************************************/
package org.eclipse.xtext.nodemodel.impl;
import java.io.Serializable;
import java.util.AbstractList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.RandomAccess;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jdt.annotation.NonNullByDefault;
@ -22,8 +23,6 @@ import org.eclipse.xtext.nodemodel.INode;
import org.eclipse.xtext.nodemodel.SyntaxErrorMessage;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
/**
* A stateful (!) builder that provides call back methods for clients who
@ -34,10 +33,32 @@ import com.google.common.collect.Maps;
@NonNullByDefault
public class NodeModelBuilder {
private static class EObjectArrayAsList extends AbstractList<EObject> implements Serializable, RandomAccess {
final EObject[] array;
EObjectArrayAsList(@Nullable EObject first, EObject[] rest) {
array = new EObject[rest.length + 1];
array[0] = first;
System.arraycopy(rest, 0, array, 1, rest.length);
}
EObjectArrayAsList(@Nullable EObject first, EObject second) {
array = new EObject[] { first, second };
}
@Override public int size() {
return array.length;
}
@Override @Nullable public EObject get(int index) {
return array[index];
}
private static final long serialVersionUID = 0;
}
private EObject forcedGrammarElement;
private Map<List<EObject>, EObject[]> cachedFoldedGrammarElements = Maps.newHashMap();
private boolean compressRoot = true;
public void addChild(ICompositeNode node, AbstractNode child) {
@ -173,18 +194,13 @@ public class NodeModelBuilder {
// it refers not to a syntax error or a semantic object
EObject myGrammarElement = casted.getGrammarElement();
Object childGrammarElement = firstChild.basicGetGrammarElement();
List<EObject> list = null;
EObjectArrayAsList list = null;
if (childGrammarElement instanceof EObject) {
list = Lists.newArrayList(myGrammarElement, (EObject) childGrammarElement);
list = new EObjectArrayAsList(myGrammarElement, (EObject) childGrammarElement);
} else {
list = Lists.asList(myGrammarElement, (EObject[]) childGrammarElement);
list = new EObjectArrayAsList(myGrammarElement, (EObject[]) childGrammarElement);
}
EObject[] newElements = cachedFoldedGrammarElements.get(list);
if (newElements == null) {
newElements = list.toArray(new EObject[list.size()]);
cachedFoldedGrammarElements.put(list, newElements);
}
casted.basicSetGrammarElement(newElements);
casted.basicSetGrammarElement(list.array);
replaceChildren(firstChild, casted);
}
}