| /* |
| * 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.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 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 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 String name; |
| |
| private final Set<FieldWriter> needs = new LinkedHashSet<FieldWriter>(); |
| private String initializer; |
| private boolean written; |
| private MortalLogger logger; |
| |
| public AbstractFieldWriter(String name, MortalLogger logger) { |
| if (name == null) { |
| throw new RuntimeException("name cannot be null"); |
| } |
| this.name = name; |
| this.logger = logger; |
| } |
| |
| public String getInitializer() { |
| return initializer; |
| } |
| |
| 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<String> pathList = Arrays.asList(path).subList(1, path.length); |
| return getReturnType(getAssignableType(), pathList, logger); |
| } |
| |
| public void needs(FieldWriter f) { |
| needs.add(f); |
| } |
| |
| 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) { |
| // TODO(rdamazio, rjrjr) This is simplistic, and will fail when |
| // we support more interesting contexts (e.g. the same need being used |
| // inside two different |
| // LazyPanels) |
| 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; |
| } |
| |
| 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; |
| } |
| |
| private JType getReturnType(JType type, List<String> path, |
| MonitoredLogger logger) { |
| // TODO(rjrjr,bobv) This is derived from CssResourceGenerator.validateValue |
| // We should find a way share code |
| |
| Iterator<String> 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; |
| } |
| } |