org.eclipse.jdt.internal.core.OpenableElementInfo Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2015 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
* Vladimir Piskarev - Thread safety of OpenableElementInfo - https://bugs.eclipse.org/450490
*******************************************************************************/
package org.eclipse.jdt.internal.core;
import org.eclipse.jdt.core.IJavaElement;
/** Element info for IOpenable elements. */
public class OpenableElementInfo extends JavaElementInfo {
/**
* Collection of handles of immediate children of this
* object. This is an empty array if this element has
* no children.
*/
protected volatile IJavaElement[] children = JavaElement.NO_ELEMENTS;
/**
* Is the structure of this element known
* @see IJavaElement#isStructureKnown()
*/
protected boolean isStructureKnown = false;
public void addChild(IJavaElement child) {
IJavaElement[] oldChildren = this.children;
int length = oldChildren.length;
if (length == 0) {
this.children = new IJavaElement[] {child};
} else {
for (int i = 0; i < length; i++) {
if (oldChildren[i].equals(child))
return; // already included
}
IJavaElement[] newChildren = new IJavaElement[length+1];
System.arraycopy(oldChildren, 0, newChildren, 0, length);
newChildren[length] = child;
this.children = newChildren;
}
}
public IJavaElement[] getChildren() {
return this.children;
}
/**
* @see IJavaElement#isStructureKnown()
*/
public boolean isStructureKnown() {
return this.isStructureKnown;
}
public void removeChild(IJavaElement child) {
IJavaElement[] oldChildren = this.children;
for (int i = 0, length = oldChildren.length; i < length; i++) {
if (oldChildren[i].equals(child)) {
if (length == 1) {
this.children = JavaElement.NO_ELEMENTS;
} else {
IJavaElement[] newChildren = new IJavaElement[length-1];
System.arraycopy(oldChildren, 0, newChildren , 0, i);
if (i < length-1)
System.arraycopy(oldChildren, i+1, newChildren, i, length-1-i);
this.children = newChildren;
}
break;
}
}
}
public void setChildren(IJavaElement[] children) {
this.children = children;
}
/**
* Sets whether the structure of this element known
* @see IJavaElement#isStructureKnown()
*/
public void setIsStructureKnown(boolean newIsStructureKnown) {
this.isStructureKnown = newIsStructureKnown;
}
}