/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.jsio.client.impl;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.jsio.client.JSList;
import com.google.gwt.jsio.client.JSWrapper;
/**
* This an implementation of List that operates directly on JS arrays of
* Strings.
*/
public final class JSStringListWrapper extends AbstractJSListWrapper<String>
implements JSList<String>, JSWrapper<JSStringListWrapper> {
private static class StringExtractor {
static String fromJS(Object o) {
return (String) o;
}
}
/**
* Used by JSNI code to construct new JSStringListWrappers.
*/
public static JSStringListWrapper create() {
return new JSStringListWrapper();
}
private static native String getNative(JavaScriptObject array, int index) /*-{
return String(array[index]);
}-*/;
public JSStringListWrapper() {
// Extractor is ignored.
arr = JavaScriptObject.createArray();
}
@Override
public void add(int index, String value) {
if (index < 0 || index > size()) {
throw new IndexOutOfBoundsException();
}
splice(arr, index, 0, value);
}
@Override
public String get(int index) {
if (index < 0 || index > size()) {
throw new IndexOutOfBoundsException();
}
return getNative(arr, index);
}
@SuppressWarnings("unchecked")
public Extractor getExtractor() {
// Unused method, the Extractor class isn't appropriate for Strings.
return null;
}
@Override
public String remove(int index) {
if (index < 0 || index > size()) {
throw new IndexOutOfBoundsException();
}
Object toReturn = splice(arr, index, 1);
if (toReturn instanceof JavaScriptObject) {
return StringExtractor.fromJS(toReturn);
} else if (toReturn instanceof String) {
return (String) toReturn;
} else {
// Don't know what to do with any other type.
assert (false);
}
return null;
}
@Override
public String set(int index, String o) {
if (index < 0 || index > size()) {
throw new IndexOutOfBoundsException();
}
Object toReturn = splice(arr, index, 1, o);
if (toReturn instanceof JavaScriptObject) {
return StringExtractor.fromJS(toReturn);
} else if (toReturn instanceof String) {
return (String) toReturn;
} else {
// Don't know what to do with any other type.
assert (false);
}
return o;
}
/**
* Convenience setter for generated subclasses to be able to initialize
* newly-created instances without another parsing cycle. This is
* intentionally not exposed via JSWrapper to prevent the backing JSONObject
* from changing out from under the wrapper.
*/
public JSStringListWrapper setJavaScriptObject(JavaScriptObject obj) {
arr = obj;
return this;
}
}
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