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/*
* 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.rebind;
import com.google.gwt.core.client.js.JsType;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.core.ext.typeinfo.JType;
import com.google.gwt.core.ext.typeinfo.NotFoundException;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.uibinder.rebind.model.OwnerField;
import com.google.gwt.user.client.ui.RenderablePanel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
/**
* Most of the implementation of {@link FieldWriter}. Subclasses are responsible
* for {@link FieldWriter#getQualifiedSourceName()} and
* {@link FieldWriter#getInstantiableType()}.
*/
abstract class AbstractFieldWriter implements FieldWriter {
private static final String DOM_ELEMENT_CLASS = "com.google.gwt.dom.client.Element";
private static final String NO_DEFAULT_CTOR_ERROR =
"%1$s has no default (zero args) constructor. To fix this, you can define"
+ " a @UiFactory method on the UiBinder's owner, or annotate a constructor of %2$s with"
+ " @UiConstructor.";
private final FieldManager manager;
private final Set needs = new LinkedHashSet();
private final List statements = new ArrayList();
private final List attachStatements = new ArrayList();
private final List detachStatements = new ArrayList();
private final String name;
private String initializer;
private boolean written;
private int buildPrecedence;
private final MortalLogger logger;
private final FieldWriterType fieldType;
private String html;
public AbstractFieldWriter(FieldManager manager, FieldWriterType fieldType,
String name, MortalLogger logger) {
if (name == null) {
throw new RuntimeException("name cannot be null");
}
this.manager = manager;
this.name = name;
this.logger = logger;
this.buildPrecedence = 1;
this.fieldType = fieldType;
}
@Override
public void addAttachStatement(String format, Object... args) {
attachStatements.add(String.format(format, args));
}
@Override
public void addDetachStatement(String format, Object... args) {
detachStatements.add(String.format(format, args));
}
@Override
public void addStatement(String format, Object... args) {
statements.add(String.format(format, args));
}
@Override
public int getBuildPrecedence() {
return buildPrecedence;
}
@Override
public FieldWriterType getFieldType() {
return fieldType;
}
public String getHtml() {
return html + ".asString()";
}
public String getInitializer() {
return initializer;
}
@Override
public String getName() {
return name;
}
@Override
public String getNextReference() {
return manager.convertFieldToGetter(name);
}
public JType getReturnType(String[] path, MonitoredLogger logger) {
if (!name.equals(path[0])) {
throw new RuntimeException(this
+ " asked to evaluate another field's path: " + path[0]);
}
List pathList = Arrays.asList(path).subList(1, path.length);
return getReturnType(getAssignableType(), pathList, logger);
}
public String getSafeHtml() {
return html;
}
public void needs(FieldWriter f) {
needs.add(f);
}
@Override
public void setBuildPrecedence(int precedence) {
this.buildPrecedence = precedence;
}
public void setHtml(String html) {
this.html = html;
}
public void setInitializer(String initializer) {
this.initializer = initializer;
}
@Override
public String toString() {
return String.format("[%s %s = %s]", this.getClass().getName(), name,
initializer);
}
public void write(IndentedWriter w) throws UnableToCompleteException {
if (written) {
return;
}
for (FieldWriter f : needs) {
f.write(w);
}
if (initializer == null) {
JClassType type = getInstantiableType();
if (type != null) {
if ((type.isInterface() == null)
&& (type.findConstructor(new JType[0]) == null)) {
logger.die(NO_DEFAULT_CTOR_ERROR, type.getQualifiedSourceName(),
type.getName());
}
}
}
if (null == initializer) {
initializer = String.format("(%1$s) GWT.create(%1$s.class)",
getQualifiedSourceName());
}
w.write("%s %s = %s;", getQualifiedSourceName(), name, initializer);
this.written = true;
}
@Override
public void writeFieldBuilder(IndentedWriter w, int getterCount,
OwnerField ownerField) {
if (getterCount > 1) {
w.write("%s; // more than one getter call detected. Type: %s, precedence: %s",
FieldManager.getFieldBuilder(name), getFieldType(), getBuildPrecedence());
return;
}
if (getterCount == 0 && ownerField != null) {
w.write("%s; // no getter call detected but must bind to ui:field. "
+ "Type: %s, precedence: %s", FieldManager.getFieldBuilder(name),
getFieldType(), getBuildPrecedence());
}
}
@Override
public void writeFieldDefinition(IndentedWriter w, TypeOracle typeOracle,
OwnerField ownerField, DesignTimeUtils designTime, int getterCount,
boolean useLazyWidgetBuilders)
throws UnableToCompleteException {
JClassType renderablePanelType = typeOracle.findType(
RenderablePanel.class.getName());
boolean outputAttachDetachCallbacks = useLazyWidgetBuilders
&& getAssignableType() != null
&& getAssignableType().isAssignableTo(renderablePanelType);
// Check initializer. Provided value takes precedence over initializer.
if (ownerField != null && ownerField.isProvided()) {
initializer = String.format("owner.%s", name);
} else if (initializer == null) {
JClassType type = getInstantiableType();
if (type != null) {
if ((type.isInterface() == null)
&& (type.findConstructor(new JType[0]) == null)) {
logger.die(NO_DEFAULT_CTOR_ERROR, type.getQualifiedSourceName(),
type.getName());
}
}
initializer = String.format("(%1$s) GWT.create(%1$s.class)",
getQualifiedSourceName());
}
w.newline();
w.write("/**");
w.write(" * Getter for %s called %s times. Type: %s. Build precedence: %s.",
name, getterCount, getFieldType(), getBuildPrecedence());
w.write(" */");
if (getterCount > 1) {
w.write("private %1$s %2$s;", getQualifiedSourceName(), name);
}
w.write("private %s %s {", getQualifiedSourceName(), FieldManager.getFieldGetter(name));
w.indent();
w.write("return %s;", (getterCount > 1) ? name : FieldManager.getFieldBuilder(name));
w.outdent();
w.write("}");
w.write("private %s %s {", getQualifiedSourceName(), FieldManager.getFieldBuilder(name));
w.indent();
w.write("// Creation section.");
if (getterCount > 1) {
w.write("%s = %s;", name, initializer);
} else {
w.write("final %s %s = %s;", getQualifiedSourceName(), name, initializer);
}
if (ownerField != null && ownerField.isProvided() && !designTime.isDesignTime()) {
w.write("assert %1$s != null : \"UiField %1$s with 'provided = true' was null\";", name);
}
w.write("// Setup section.");
writeStatements(w, statements);
if (attachStatements.size() > 0) {
w.newline();
if (outputAttachDetachCallbacks) {
w.write("// Attach section.");
// TODO(rdcastro): This is too coupled with RenderablePanel.
// Make this nicer.
w.write("%s.wrapInitializationCallback = ", getName());
w.indent();
w.indent();
w.write(
"new com.google.gwt.user.client.Command() {");
w.outdent();
w.write("@Override public void execute() {");
w.indent();
writeStatements(w, attachStatements);
w.outdent();
w.write("}");
w.outdent();
w.write("};");
} else {
String attachedVar = "__attachRecord__";
w.write("{");
w.indent();
w.write("// Attach section.");
String elementToAttach = getInstantiableType().isAssignableTo(getDomElement(typeOracle))
? name : name + ".getElement()";
w.write("UiBinderUtil.TempAttachment %s = UiBinderUtil.attachToDom(%s);",
attachedVar, elementToAttach);
w.newline();
writeStatements(w, attachStatements);
w.newline();
// If we forced an attach, we should always detach, regardless of whether
// there are any detach statements.
w.write("// Detach section.");
w.write("%s.detach();", attachedVar);
w.outdent();
w.write("}");
}
}
if (detachStatements.size() > 0) {
if (outputAttachDetachCallbacks) {
w.write("%s.detachedInitializationCallback = ", getName());
w.indent();
w.indent();
w.write("new com.google.gwt.user.client.Command() {");
w.outdent();
w.write("@Override public void execute() {");
w.indent();
}
writeStatements(w, detachStatements);
if (outputAttachDetachCallbacks) {
w.outdent();
w.write("}");
w.outdent();
w.write("};");
}
}
if ((ownerField != null) && !ownerField.isProvided()) {
w.newline();
// If the type of the field is annotated with JsType, then use a dynamic cast
// to convert it from Element. We assume the developer knows what they are doing
// and that the JsType represents some form of native DOM element.
// For more information, see the design doc here: http://goo.gl/eRjoD9
// TODO: When we know better how this is used, we might want to loosen the annotation
// constraint (e.g. it might be sufficient for the declared type to extend another
// interface that is a JsType).
if (!ownerField.getRawType().isAssignableTo(getDomElement(typeOracle))
&& ownerField.getRawType().getAnnotation(JsType.class) != null) {
w.write(
"this.owner.%1$s = (%2$s) %1$s;", name,
ownerField.getRawType().getQualifiedSourceName());
} else {
w.write("this.owner.%1$s = %1$s;", name);
}
}
w.newline();
w.write("return %s;", name);
w.outdent();
w.write("}");
}
private JMethod findMethod(JClassType type, String methodName) {
// TODO Move this and getClassHierarchyBreadthFirst to JClassType
for (JClassType nextType : UiBinderWriter.getClassHierarchyBreadthFirst(type)) {
try {
return nextType.getMethod(methodName, new JType[0]);
} catch (NotFoundException e) {
/* try parent */
}
}
return null;
}
/**
* Gets a reference to the type object representing {@link com.google.gwt.dom.client.Element}.
*/
private JClassType getDomElement(TypeOracle typeOracle) {
JClassType domElement = typeOracle.findType(DOM_ELEMENT_CLASS);
assert domElement != null;
return domElement;
}
private JType getReturnType(JType type, List path,
MonitoredLogger logger) {
// TODO(rjrjr,bobv) This is derived from CssResourceGenerator.validateValue
// We should find a way share code
Iterator i = path.iterator();
while (i.hasNext()) {
String pathElement = i.next();
JClassType referenceType = type.isClassOrInterface();
if (referenceType == null) {
logger.error("Cannot resolve member " + pathElement
+ " on non-reference type " + type.getQualifiedSourceName());
return null;
}
JMethod m = findMethod(referenceType, pathElement);
if (m == null) {
logger.error("Could not find no-arg method named " + pathElement
+ " in type " + type.getQualifiedSourceName());
return null;
}
type = m.getReturnType();
}
return type;
}
private static void writeStatements(IndentedWriter w, Iterable statements) {
for (String s : statements) {
w.write(s);
}
}
}
