| /* |
| * Copyright (C) 2010 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.clearsilver.jsilver.values; |
| |
| import com.google.clearsilver.jsilver.autoescape.EscapeMode; |
| import com.google.clearsilver.jsilver.data.Data; |
| import com.google.clearsilver.jsilver.data.DataContext; |
| import com.google.clearsilver.jsilver.data.TypeConverter; |
| |
| /** |
| * A value linked to a variable reference. When this value is evaluated in an expression a Data |
| * object will be fetched from the provided DataContext and and its value returned or {@code null} |
| * if there is no Data object associated with the given name. |
| * |
| * @see Value |
| * @see Data |
| */ |
| public class VariableValue extends VariantValue { |
| // TODO: Make this non-public and come up with a smarter way |
| // for it to be used elsewhere without having to be used in a cast. |
| |
| private final String name; |
| private final DataContext dataContext; |
| |
| private boolean gotRef = false; |
| private Data reference; |
| |
| public VariableValue(String name, DataContext dataContext) { |
| // VariableValues always have partiallyEscaped=false since they represent |
| // a Data object, not a compound expression containing escaping functions. |
| // We override getEscapeMode() to return the Data object's escape mode, |
| // so the mode we pass here is just ignored. |
| super(EscapeMode.ESCAPE_NONE, false); |
| this.dataContext = dataContext; |
| this.name = name; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| public Data getReference() { |
| if (!gotRef) { |
| reference = dataContext.findVariable(name, false); |
| gotRef = true; |
| } |
| return reference; |
| } |
| |
| @Override |
| protected String value() { |
| Data data = getReference(); |
| return data == null ? null : data.getValue(); |
| } |
| |
| @Override |
| public boolean exists() { |
| return TypeConverter.exists(getReference()); |
| } |
| |
| // Note we are not overriding asString as we want that to return the value |
| // of the node located at this address. |
| @Override |
| public String toString() { |
| return name; |
| } |
| |
| @Override |
| public EscapeMode getEscapeMode() { |
| Data data = getReference(); |
| if (data == null) { |
| return super.getEscapeMode(); |
| } |
| return data.getEscapeMode(); |
| } |
| |
| } |