/*
* Copyright 2010 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.web.bindery.autobean.gwt.client.impl;
import com.google.web.bindery.autobean.shared.Splittable;
import com.google.web.bindery.autobean.shared.impl.HasSplittable;
import com.google.web.bindery.autobean.shared.impl.StringQuoter;
import com.google.gwt.core.client.GwtScriptOnly;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsonUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Implements the EntityCodex.Splittable interface using a raw JavaScriptObject.
* <p>
* A string value represented by a JsoSplittable can't use the string object
* directly, since {@code String.prototype} is overridden, so instead a
* temporary wrapper object is used to encapsulate the string data.
*/
@GwtScriptOnly
public final class JsoSplittable extends JavaScriptObject implements Splittable, HasSplittable {
private static boolean stringifyFastTested;
private static boolean stringifyFastResult;
public static native JsoSplittable create() /*-{
return {};
}-*/;
public static Splittable create(boolean value) {
return create0(value);
}
public static Splittable create(double value) {
return create0(value);
}
public static Splittable create(String value) {
return create0(value);
}
public static native JsoSplittable createIndexed() /*-{
return [];
}-*/;
public static native JsoSplittable nullValue() /*-{
return null;
}-*/;
private static native Splittable create0(boolean object) /*-{
return Boolean(object);
}-*/;
private static native Splittable create0(double object) /*-{
return Number(object);
}-*/;
private static native Splittable create0(String object) /*-{
return {
__s : object
};
}-*/;
private static native boolean isUnwrappedString(JavaScriptObject obj) /*-{
return Object.prototype.toString.call(obj) == '[object String]';
}-*/;
private static boolean stringifyFastSupported() {
if (stringifyFastTested) {
return stringifyFastResult;
}
stringifyFastTested = true;
return stringifyFastResult = stringifyFastSupported0();
}
/**
* Test that the JSON api is available and that it does not add function
* objects to the output. The test for function objects is for old versions of
* Safari.
*/
private static native boolean stringifyFastSupported0() /*-{
return $wnd.JSON && $wnd.JSON.stringify && $wnd.JSON.stringify({
b : function() {
}
}) == '{}';
}-*/;
protected JsoSplittable() {
};
public native boolean asBoolean() /*-{
return this == true;
}-*/;
public native double asNumber() /*-{
return Number(this);
}-*/;
public void assign(Splittable parent, int index) {
if (isString()) {
assign0(parent, index, asString());
} else {
assign0(parent, index, this);
}
}
public void assign(Splittable parent, String index) {
if (isString()) {
assign0(parent, index, asString());
} else {
assign0(parent, index, this);
}
}
public native String asString() /*-{
return this.__s;
}-*/;
public Splittable deepCopy() {
return StringQuoter.split(getPayload());
}
public JsoSplittable get(int index) {
return getRaw(index);
}
public JsoSplittable get(String key) {
return getRaw(key);
}
public String getPayload() {
if (isString()) {
return JsonUtils.escapeValue(asString());
}
if (stringifyFastSupported()) {
return stringifyFast();
}
return stringifySlow();
}
public List<String> getPropertyKeys() {
List<String> toReturn = new ArrayList<String>();
getPropertyKeys0(toReturn);
return Collections.unmodifiableList(toReturn);
}
public native Object getReified(String key) /*-{
return this.__reified && this.__reified[':' + key];
}-*/;
public Splittable getSplittable() {
return this;
}
public native boolean isBoolean() /*-{
return Object.prototype.toString.call(this) == '[object Boolean]';
}-*/;
public native boolean isFunction() /*-{
return Object.prototype.toString.call(this) == '[object Function]';
}-*/;
public native boolean isIndexed() /*-{
return Object.prototype.toString.call(this) == '[object Array]';
}-*/;
public boolean isKeyed() {
return this != NULL && !isString() && !isIndexed() && !isFunction();
}
public native boolean isNull(int index) /*-{
return this[index] == null;
}-*/;
public native boolean isNull(String key) /*-{
return this[key] == null;
}-*/;
public native boolean isNumber() /*-{
return Object.prototype.toString.call(this) == '[object Number]';
}-*/;
public native boolean isReified(String key) /*-{
return !!(this.__reified && this.__reified.hasOwnProperty(':' + key));
}-*/;
/**
* Returns whether or not the current object is a string-carrier.
*/
public native boolean isString() /*-{
return this && this.__s != null;
}-*/;
public native boolean isUndefined(String key) /*-{
return this[key] === undefined;
}-*/;
public native void setReified(String key, Object object) /*-{
// Use a function object so native JSON.stringify will ignore
(this.__reified || (this.__reified = function() {
}))[':' + key] = object;
}-*/;
public native void setSize(int size) /*-{
this.length = size;
}-*/;
public native int size() /*-{
return this.length;
}-*/;
private native void assign0(Splittable parent, int index, Splittable value) /*-{
parent[index] = value;
}-*/;
private native void assign0(Splittable parent, int index, String value) /*-{
parent[index] = value;
}-*/;
private native void assign0(Splittable parent, String index, Splittable value) /*-{
parent[index] = value;
}-*/;
private native void assign0(Splittable parent, String index, String value) /*-{
parent[index] = value;
}-*/;
private native void getPropertyKeys0(List<String> list) /*-{
for (key in this) {
if (this.hasOwnProperty(key)) {
list.@java.util.List::add(Ljava/lang/Object;)(key);
}
}
}-*/;
private native JsoSplittable getRaw(int index) /*-{
_ = this[index];
if (_ == null) {
return null;
}
if (@com.google.web.bindery.autobean.gwt.client.impl.JsoSplittable::isUnwrappedString(*)(_)) {
return @com.google.web.bindery.autobean.gwt.client.impl.JsoSplittable::create(Ljava/lang/String;)(_);
}
return Object(_);
}-*/;
private native JsoSplittable getRaw(String index) /*-{
_ = this[index];
if (_ == null) {
return null;
}
if (@com.google.web.bindery.autobean.gwt.client.impl.JsoSplittable::isUnwrappedString(*)(_)) {
return @com.google.web.bindery.autobean.gwt.client.impl.JsoSplittable::create(Ljava/lang/String;)(_);
}
return Object(_);
}-*/;
/**
* The test for {@code $H} removes the key in the emitted JSON, however making
* a similar test for {@code __reified} causes the key to be emitted with an
* explicit {@code null} value.
*/
private native String stringifyFast() /*-{
return $wnd.JSON.stringify(this, function(key, value) {
if (key == "$H") {
return;
}
return value;
});
}-*/;
private String stringifySlow() {
StringBuilder sb = new StringBuilder();
stringifySlow(sb);
return sb.toString();
}
private void stringifySlow(StringBuilder sb) {
if (this == NULL) {
sb.append("null");
return;
}
if (isBoolean()) {
sb.append(asBoolean());
return;
}
if (isNumber()) {
sb.append(asNumber());
return;
}
if (isString()) {
sb.append(JsonUtils.escapeValue(asString()));
return;
}
if (isIndexed()) {
sb.append("[");
for (int i = 0, j = size(); i < j; i++) {
if (i > 0) {
sb.append(",");
}
get(i).stringifySlow(sb);
}
sb.append("]");
return;
}
sb.append("{");
boolean needsComma = false;
for (String key : getPropertyKeys()) {
if (needsComma) {
sb.append(",");
} else {
needsComma = true;
}
JsoSplittable value = get(key);
if (!value.isFunction()) {
if ("$H".equals(key)) {
// Ignore hashcode
continue;
}
sb.append(JsonUtils.escapeValue(key));
sb.append(":");
value.stringifySlow(sb);
}
}
sb.append("}");
}
}