1 /* 2 * Copyright (C) 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.clearsilver.jsilver.values; 18 19 import com.google.clearsilver.jsilver.autoescape.EscapeMode; 20 import com.google.clearsilver.jsilver.data.TypeConverter; 21 22 /** 23 * Base class for values of variant types (i.e. those that can be treated as different types at 24 * runtime - e.g. "33"). 25 * 26 * @see Value 27 */ 28 abstract class VariantValue extends Value { 29 30 private static final String EMPTY = ""; 31 VariantValue(EscapeMode escapeMode, boolean partiallyEscaped)32 VariantValue(EscapeMode escapeMode, boolean partiallyEscaped) { 33 super(escapeMode, partiallyEscaped); 34 } 35 value()36 protected abstract String value(); 37 38 @Override asBoolean()39 public boolean asBoolean() { 40 return TypeConverter.asBoolean(value()); 41 } 42 43 @Override asString()44 public String asString() { 45 String value = value(); 46 return value == null ? EMPTY : value; 47 } 48 49 @Override asNumber()50 public int asNumber() { 51 // TODO: Cache the result for constant values (or just get rid of this class) 52 return TypeConverter.asNumber(value()); 53 } 54 55 @Override isEmpty()56 public boolean isEmpty() { 57 return asString().isEmpty(); 58 } 59 60 } 61