/*
* 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.parsers;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
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 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");
}
/**
* TODO(jgw): This will be moved into EnumAttributeParser as soon as I get
* around to building it.
*/
static String getFullyQualifiedEnumName(Enum<?> e) {
Class<?> cls = e.getClass();
String clsName = cls.getCanonicalName();
if (clsName == null) {
// A synthesized enum subtype (e.g., Unit$3) will have no canonical name
// (yet will not be marked as synthetic). Its superclass will be the
// one we want (e.g., Unit).
clsName = cls.getSuperclass().getCanonicalName();
}
return clsName + "." + e.name();
}
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)) {
Unit unit = elem.consumeEnumAttribute("unit", Unit.class);
writer.setFieldInitializerAsConstructor(fieldName,
writer.getOracle().findType(DockLayoutPanel.class.getName()),
getFullyQualifiedEnumName(unit));
}
// 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 %s, child must be one of {north, south, east, west, center}",
elem);
}
// Consume the single widget element.
XMLElement widget = child.consumeSingleChildElement();
String childFieldName = writer.parseElementToField(widget);
if (requiresSize(child)) {
double size = child.consumeDoubleAttribute("size");
writer.addStatement("%s.%s(%s, %f);", fieldName, addMethodName(child),
childFieldName, size);
} else {
writer.addStatement("%s.%s(%s);", fieldName, addMethodName(child),
childFieldName);
}
}
// Emit the layout() call.
writer.addStatement("%s.layout();", fieldName);
}
private String addMethodName(XMLElement elem) {
return DOCK_NAMES.get(elem.getLocalName());
}
private JClassType getSplitLayoutPanelType(UiBinderWriter writer)
throws UnableToCompleteException {
try {
return writer.getOracle().getType(SplitLayoutPanel.class.getName());
} catch (NotFoundException e) {
throw new RuntimeException("Unexpected exception", e);
}
}
private boolean isValidChildElement(XMLElement parent, XMLElement child) {
return child.getNamespaceUri().equals(parent.getNamespaceUri())
&& DOCK_NAMES.containsKey(child.getLocalName());
}
private boolean requiresSize(XMLElement elem) {
return !elem.getLocalName().equals("center");
}
}