| /* |
| * 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.attributeparsers; |
| |
| import com.google.gwt.core.ext.UnableToCompleteException; |
| import com.google.gwt.core.ext.typeinfo.JType; |
| import com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.Delegate; |
| import com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.IllegalFieldReferenceException; |
| import com.google.gwt.uibinder.rebind.MortalLogger; |
| |
| /** |
| * Fall through attribute parser. Accepts a field reference or nothing. |
| */ |
| class StrictAttributeParser implements AttributeParser { |
| |
| /** |
| * Package protected for testing. |
| */ |
| static class FieldReferenceDelegate implements Delegate { |
| private boolean sawReference = false; |
| private final JType type; |
| |
| FieldReferenceDelegate(JType type) { |
| this.type = type; |
| } |
| |
| public JType getType() { |
| return type; |
| } |
| |
| public String handleFragment(String fragment) |
| throws IllegalFieldReferenceException { |
| if (fragment.length() > 0) { |
| throw new IllegalFieldReferenceException(); |
| } |
| return fragment; |
| } |
| |
| public String handleReference(String reference) |
| throws IllegalFieldReferenceException { |
| assertOnly(); |
| sawReference = true; |
| return reference; |
| } |
| |
| private void assertOnly() { |
| if (sawReference) { |
| throw new IllegalFieldReferenceException(); |
| } |
| } |
| } |
| |
| private final FieldReferenceConverter converter; |
| protected final MortalLogger logger; |
| private final JType type; |
| |
| StrictAttributeParser(FieldReferenceConverter converter, JType type, |
| MortalLogger logger) { |
| this.converter = converter; |
| this.type = type; |
| this.logger = logger; |
| } |
| |
| /** |
| * If the value holds a single field reference "{like.this}", converts it to a |
| * Java Expression. |
| * <p> |
| * In any other case (e.g. more than one field reference), an |
| * UnableToCompleteException is thrown. |
| */ |
| public String parse(String value) throws UnableToCompleteException { |
| if ("".equals(value.trim())) { |
| logger.die("Cannot use empty value as type %s", type.getSimpleSourceName()); |
| } |
| try { |
| return converter.convert(value, new FieldReferenceDelegate(type)); |
| } catch (IllegalFieldReferenceException e) { |
| logger.die("Cannot parse value: \"%s\" as type %s", value, type.getSimpleSourceName()); |
| return null; // Unreachable |
| } |
| } |
| } |