/*
* Copyright 2009 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.uibinder.elementparsers;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JEnumType;
import com.google.gwt.core.ext.typeinfo.NotFoundException;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.uibinder.rebind.UiBinderWriter;
import com.google.gwt.uibinder.rebind.XMLElement;
import com.google.gwt.user.client.ui.DockLayoutPanel;
import com.google.gwt.user.client.ui.SplitLayoutPanel;
import java.util.HashMap;
import java.util.Map;
/**
* Parses {@link DockLayoutPanel} widgets.
*
* TODO(jgw): The code that explicitly excludes SplitLayoutPanel in a fairly
* awkward way could be greatly simplified if we hoisted the "dock-ness" into an
* interface implemented by both DockLayoutPanel and SplitLayoutPanel, and moved
* most of this code into a parser for that specific interface. This parser
* would then be reduced to a simple special case for the ctor param.
*/
public class DockLayoutPanelParser implements ElementParser {
private static class CenterChild {
final String widgetName;
final XMLElement child;
public CenterChild(XMLElement child, String widgetName) {
this.widgetName = widgetName;
this.child = child;
}
}
private static final Map<String, String> DOCK_NAMES = new HashMap<String, String>();
static {
DOCK_NAMES.put("north", "addNorth");
DOCK_NAMES.put("south", "addSouth");
DOCK_NAMES.put("east", "addEast");
DOCK_NAMES.put("west", "addWest");
DOCK_NAMES.put("center", "add");
}
public void parse(XMLElement elem, String fieldName, JClassType type,
UiBinderWriter writer) throws UnableToCompleteException {
// Generate instantiation (requires a 'unit' ctor param).
// (Don't generate a ctor for the SplitLayoutPanel; it's implicitly PX).
if (type != getSplitLayoutPanelType(writer)) {
JEnumType unitEnumType = writer.getOracle().findType(
Unit.class.getCanonicalName()).isEnum();
String unit = elem.consumeAttribute("unit", unitEnumType);
writer.setFieldInitializerAsConstructor(fieldName,
writer.getOracle().findType(DockLayoutPanel.class.getName()), unit);
}
CenterChild center = null;
// Parse children.
for (XMLElement child : elem.consumeChildElements()) {
// Make sure the element is one of the fixed set of valid directions.
if (!isValidChildElement(elem, child)) {
writer.die(
"In %1$s, child must be one of "
+ "<%2$s:north>, <%2$s:south>, <%2$s:east>, <%2$s:west> or <%2$s:center>, "
+ "but found %3$s", elem, elem.getPrefix(), child);
}
// Consume the single widget element.
XMLElement widget = child.consumeSingleChildElement();
if (!writer.isWidgetElement(widget)) {
writer.die("In %s, %s must contain a widget, but found %s", elem, child,
widget);
}
String widgetName = writer.parseElementToField(widget);
if (child.getLocalName().equals("center")) {
if (center != null) {
writer.die("In %s, only one <%s:center> is allowed", elem,
elem.getPrefix());
}
center = new CenterChild(child, widgetName);
} else {
String size = child.consumeDoubleAttribute("size");
writer.addStatement("%s.%s(%s, %s);", fieldName, addMethodName(child),
widgetName, size);
}
}
if (center != null) {
writer.addStatement("%s.%s(%s);", fieldName, addMethodName(center.child),
center.widgetName);
}
}
private String addMethodName(XMLElement elem) {
return DOCK_NAMES.get(elem.getLocalName());
}
private JClassType getSplitLayoutPanelType(UiBinderWriter writer) {
try {
return writer.getOracle().getType(SplitLayoutPanel.class.getName());
} catch (NotFoundException e) {
throw new RuntimeException("Unexpected exception", e);
}
}
private boolean isValidChildElement(XMLElement parent, XMLElement child) {
String childNsUri = child.getNamespaceUri();
if (childNsUri == null) {
return false;
}
if (!childNsUri.equals(parent.getNamespaceUri())) {
return false;
}
if (!DOCK_NAMES.containsKey(child.getLocalName())) {
return false;
}
// Made it through the gauntlet.
return true;
}
}