156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson/* 256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Copyright (C) 2010 Google Inc. 356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Licensed under the Apache License, Version 2.0 (the "License"); 556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * you may not use this file except in compliance with the License. 656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * You may obtain a copy of the License at 756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * http://www.apache.org/licenses/LICENSE-2.0 956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 1056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * Unless required by applicable law or agreed to in writing, software 1156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * distributed under the License is distributed on an "AS IS" BASIS, 1256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * See the License for the specific language governing permissions and 1456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * limitations under the License. 1556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson */ 1656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 1756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonpackage com.google.clearsilver.jsilver.values; 1856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 1956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport com.google.clearsilver.jsilver.autoescape.EscapeMode; 2056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport com.google.clearsilver.jsilver.data.Data; 2156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport com.google.clearsilver.jsilver.data.DataContext; 2256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonimport com.google.clearsilver.jsilver.data.TypeConverter; 2356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 2456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson/** 2556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * A value linked to a variable reference. When this value is evaluated in an expression a Data 2656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * object will be fetched from the provided DataContext and and its value returned or {@code null} 2756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * if there is no Data object associated with the given name. 2856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * 2956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * @see Value 3056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson * @see Data 3156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson */ 3256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodsonpublic class VariableValue extends VariantValue { 3356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // TODO: Make this non-public and come up with a smarter way 3456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // for it to be used elsewhere without having to be used in a cast. 3556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 3656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson private final String name; 3756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson private final DataContext dataContext; 3856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 3956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson private boolean gotRef = false; 4056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson private Data reference; 4156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 4256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public VariableValue(String name, DataContext dataContext) { 4356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // VariableValues always have partiallyEscaped=false since they represent 4456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // a Data object, not a compound expression containing escaping functions. 4556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // We override getEscapeMode() to return the Data object's escape mode, 4656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // so the mode we pass here is just ignored. 4756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson super(EscapeMode.ESCAPE_NONE, false); 4856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson this.dataContext = dataContext; 4956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson this.name = name; 5056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 5156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 5256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public String getName() { 5356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return name; 5456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 5556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 5656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public Data getReference() { 5756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson if (!gotRef) { 5856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson reference = dataContext.findVariable(name, false); 5956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson gotRef = true; 6056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 6156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return reference; 6256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 6356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 6456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson @Override 6556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson protected String value() { 6656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson Data data = getReference(); 6756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return data == null ? null : data.getValue(); 6856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 6956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 7056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson @Override 7156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public boolean exists() { 7256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return TypeConverter.exists(getReference()); 7356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 7456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 7556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // Note we are not overriding asString as we want that to return the value 7656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson // of the node located at this address. 7756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson @Override 7856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public String toString() { 7956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return name; 8056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 8156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 8256ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson @Override 8356ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson public EscapeMode getEscapeMode() { 8456ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson Data data = getReference(); 8556ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson if (data == null) { 8656ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return super.getEscapeMode(); 8756ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 8856ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson return data.getEscapeMode(); 8956ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson } 9056ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson 9156ed4167b942ec265f9cee70ac4d71d10b3835ceBen Dodson} 92