// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.debug.core.model;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import org.chromium.sdk.JsArray;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IIndexedValue;
import org.eclipse.debug.core.model.IVariable;
/**
* An IIndexedValue implementation for an array element range using a JsArray
* instance.
*/
public class ArrayValue extends Value implements IIndexedValue {
private final AtomicReference<IVariable[]> elementsRef = new AtomicReference<IVariable[]>(null);
public ArrayValue(EvaluateContext evaluateContext, JsArray array,
ExpressionTracker.Node expressionTrackerNode) {
super(evaluateContext, array, expressionTrackerNode);
}
private IVariable[] createElements() {
JsArray jsArray = (JsArray) getJsValue();
return StackFrame.wrapVariables(getEvaluateContext(), jsArray.getProperties(),
ARRAY_HIDDEN_PROPERTY_NAMES,
// Do not show internal properties for arrays (this may be an option).
null, null, getExpressionTrackerNode());
}
private IVariable[] getElements() {
IVariable[] result = elementsRef.get();
if (result == null) {
result = createElements();
elementsRef.compareAndSet(null, result);
return elementsRef.get();
} else {
return result;
}
}
public int getInitialOffset() {
return 0;
}
public int getSize() throws DebugException {
return getElements().length;
}
public IVariable getVariable(int offset) throws DebugException {
return getElements()[offset];
}
public IVariable[] getVariables(int offset, int length) throws DebugException {
IVariable[] result = new IVariable[length];
System.arraycopy(getElements(), offset, result, 0, length);
return result;
}
@Override
public IVariable[] getVariables() throws DebugException {
return getElements();
}
@Override
public boolean hasVariables() throws DebugException {
// Being optimistic. Too complicated to check accurately.
return true;
}
private static final Set<String> ARRAY_HIDDEN_PROPERTY_NAMES = Collections.singleton("length");
}