| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 freemarker.core; |
| |
| import java.io.IOException; |
| |
| import freemarker.template.TemplateException; |
| |
| /** |
| * An element that represents a conditionally executed block: #if, #elseif or #elseif. Note that when an #if has |
| * related #elseif-s or #else, an {@link IfBlock} parent must be used. For a lonely #if, no such parent is needed. |
| */ |
| |
| final class ConditionalBlock extends TemplateElement { |
| |
| static final int TYPE_IF = 0; |
| static final int TYPE_ELSE = 1; |
| static final int TYPE_ELSE_IF = 2; |
| |
| final Expression condition; |
| private final int type; |
| |
| ConditionalBlock(Expression condition, TemplateElements children, int type) { |
| this.condition = condition; |
| setChildren(children); |
| this.type = type; |
| } |
| |
| @Override |
| TemplateElement[] accept(Environment env) throws TemplateException, IOException { |
| if (condition == null || condition.evalToBoolean(env)) { |
| return getChildBuffer(); |
| } |
| return null; |
| } |
| |
| @Override |
| protected String dump(boolean canonical) { |
| StringBuilder buf = new StringBuilder(); |
| if (canonical) buf.append('<'); |
| buf.append(getNodeTypeSymbol()); |
| if (condition != null) { |
| buf.append(' '); |
| buf.append(condition.getCanonicalForm()); |
| } |
| if (canonical) { |
| buf.append(">"); |
| buf.append(getChildrenCanonicalForm()); |
| if (!(getParentElement() instanceof IfBlock)) { |
| buf.append("</#if>"); |
| } |
| } |
| return buf.toString(); |
| } |
| |
| @Override |
| String getNodeTypeSymbol() { |
| if (type == TYPE_ELSE) { |
| return "#else"; |
| } else if (type == TYPE_IF) { |
| return "#if"; |
| } else if (type == TYPE_ELSE_IF) { |
| return "#elseif"; |
| } else { |
| throw new BugException("Unknown type"); |
| } |
| } |
| |
| @Override |
| int getParameterCount() { |
| return 2; |
| } |
| |
| @Override |
| Object getParameterValue(int idx) { |
| switch (idx) { |
| case 0: return condition; |
| case 1: return Integer.valueOf(type); |
| default: throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| @Override |
| ParameterRole getParameterRole(int idx) { |
| switch (idx) { |
| case 0: return ParameterRole.CONDITION; |
| case 1: return ParameterRole.AST_NODE_SUBTYPE; |
| default: throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| @Override |
| boolean isNestedBlockRepeater() { |
| return false; |
| } |
| |
| } |