// 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.sdk.internal;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import org.chromium.sdk.JsArray;
import org.chromium.sdk.JsVariable;
import org.chromium.sdk.internal.tools.v8.MethodIsBlockingException;
/**
* A generic implementation of the JsArray interface.
*/
class JsArrayImpl extends JsObjectImpl implements JsArray {
/**
* An indexed sparse array of elements. Keys are indices, values are elements.
*/
private SortedMap<Integer, JsVariableImpl> indexToElementMap;
/**
* This constructor implies lazy resolution of object properties.
*
* @param context this array belongs in
* @param variableFqn the fully qualified name of the variable holding this array
* @param valueState the mirror corresponding to this array
*/
JsArrayImpl(InternalContext context, String variableFqn, ValueMirror valueState) {
super(context, variableFqn, valueState);
}
private synchronized void ensureElementsMap() throws MethodIsBlockingException {
if (indexToElementMap != null) {
return;
}
SortedMap<Integer, JsVariableImpl> map =
// TODO(peter.rybin): do we need this comparator at all?
new TreeMap<Integer, JsVariableImpl>(new Comparator<Integer>() {
public int compare(Integer o1, Integer o2) {
return o1 - o2;
}
});
for (JsVariableImpl prop : getProperties()) {
Object name = prop.getRawNameAsObject();
if (name instanceof Number == false) {
continue;
}
Number index = (Number) name;
map.put(index.intValue(), prop);
}
indexToElementMap = Collections.unmodifiableSortedMap(map);
}
public JsVariable get(int index) throws MethodIsBlockingException {
ensureElementsMap();
return indexToElementMap.get(index);
}
public SortedMap<Integer, ? extends JsVariable> toSparseArray() throws MethodIsBlockingException {
ensureElementsMap();
return indexToElementMap;
}
public int length() {
// TODO(peter.rybin) optimize it: either read "length" from remote or count PropertyReference
// rather than JsVariableImpl
int lastIndex = -1;
List<JsVariableImpl> properties = getSubpropertiesHelper().getPropertiesLazily();
// TODO(peter.rybin): rename propRefs
for (JsVariableImpl prop : properties) {
Object name = prop.getRawNameAsObject();
if (name instanceof Number == false) {
continue;
}
Number index = (Number) name;
int intIndex = index.intValue();
if (intIndex > lastIndex) {
lastIndex = intIndex;
}
}
return lastIndex + 1;
}
@Override
public String toString() {
SortedMap<Integer, ? extends JsVariable> elements;
try {
elements = toSparseArray();
} catch (MethodIsBlockingException e) {
return "[JsArray: Exception in retrieving data]";
}
StringBuilder result = new StringBuilder();
result.append("[JsArray: length=").append(elements.size());
for (Map.Entry<Integer, ? extends JsVariable> entry : elements.entrySet()) {
result.append(',').append(entry.getKey()).append('=').append(entry.getValue());
}
result.append(']');
return result.toString();
}
@Override
public JsArrayImpl asArray() {
return this;
}
}