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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.oracle.truffle.api.test;
import java.util.Iterator;
import org.junit.Assert;
import org.junit.Test;
import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.TruffleRuntime;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;
/**
* <h3>Creating an Array of Children Nodes</h3>
*
* <p>
* An array of children nodes can be used as a field in a parent node. The field has to be annotated
* with {@link com.oracle.truffle.api.nodes.Node.Children} and must be declared private and final.
* Before assigning the field in the parent node constructor, {@link Node#adoptChildren} must be
* called in order to update the parent pointers in the child nodes. After filling the array with
* its first values, it must never be changed. It is only possible to call {@link Node#replace} on a
* child node.
* </p>
*
* <p>
* The next part of the Truffle API introduction is at
* {@link com.oracle.truffle.api.test.FinalFieldTest} .
* </p>
*/
public class ChildrenNodesTest {
@Test
public void test() {
TruffleRuntime runtime = Truffle.getRuntime();
TestChildNode firstChild = new TestChildNode();
TestChildNode secondChild = new TestChildNode();
TestRootNode rootNode = new TestRootNode(new TestChildNode[]{firstChild, secondChild});
CallTarget target = runtime.createCallTarget(rootNode);
Assert.assertEquals(rootNode, firstChild.getParent());
Assert.assertEquals(rootNode, secondChild.getParent());
Iterator<Node> iterator = rootNode.getChildren().iterator();
Assert.assertEquals(firstChild, iterator.next());
Assert.assertEquals(secondChild, iterator.next());
Assert.assertFalse(iterator.hasNext());
Object result = target.call();
Assert.assertEquals(42, result);
}
class TestRootNode extends RootNode {
@Children private final TestChildNode[] children;
TestRootNode(TestChildNode[] children) {
super(null);
this.children = children;
}
@Override
public Object execute(VirtualFrame frame) {
int sum = 0;
for (int i = 0; i < children.length; ++i) {
sum += children[i].execute();
}
return sum;
}
}
class TestChildNode extends Node {
TestChildNode() {
}
public int execute() {
return 21;
}
}
@Test
public void testMultipleChildrenFields() {
TruffleRuntime runtime = Truffle.getRuntime();
TestChildNode firstChild = new TestChildNode();
TestChildNode secondChild = new TestChildNode();
TestChildNode thirdChild = new TestChildNode();
TestChildNode forthChild = new TestChildNode();
TestRootNode rootNode = new TestRoot2Node(new TestChildNode[]{firstChild, secondChild}, new TestChildNode[]{thirdChild, forthChild});
CallTarget target = runtime.createCallTarget(rootNode);
Assert.assertEquals(rootNode, firstChild.getParent());
Assert.assertEquals(rootNode, secondChild.getParent());
Assert.assertEquals(rootNode, thirdChild.getParent());
Assert.assertEquals(rootNode, forthChild.getParent());
Iterator<Node> iterator = rootNode.getChildren().iterator();
Assert.assertEquals(firstChild, iterator.next());
Assert.assertEquals(secondChild, iterator.next());
Assert.assertEquals(thirdChild, iterator.next());
Assert.assertEquals(forthChild, iterator.next());
Assert.assertFalse(iterator.hasNext());
Object result = target.call();
Assert.assertEquals(2 * 42, result);
}
class TestRoot2Node extends TestRootNode {
@Children private final TestChildNode[] children1;
@Children private final TestChildNode[] children2;
TestRoot2Node(TestChildNode[] children1, TestChildNode[] children2) {
super(new TestChildNode[0]);
this.children1 = children1;
this.children2 = children2;
}
@Override
public Object execute(VirtualFrame frame) {
int sum = 0;
for (int i = 0; i < children1.length; ++i) {
sum += children1[i].execute();
}
for (int i = 0; i < children2.length; ++i) {
sum += children2[i].execute();
}
return sum;
}
}
}