| /* |
| * 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 freemarker.template.utility.CollectionUtils; |
| |
| /** |
| * Holds an buffer (array) of {@link TemplateElement}-s with the count of the utilized items in it. The un-utilized tail |
| * of the array must only contain {@code null}-s. |
| * |
| * @since 2.3.24 |
| */ |
| class TemplateElements { |
| |
| static final TemplateElements EMPTY = new TemplateElements(null, 0); |
| |
| private final TemplateElement[] buffer; |
| private final int count; |
| |
| /** |
| * @param buffer |
| * The buffer; {@code null} exactly if {@code count} is 0. |
| * @param count |
| * The number of utilized buffer elements; if 0, then {@code null} must be {@code null}. |
| */ |
| TemplateElements(TemplateElement[] buffer, int count) { |
| /* |
| // Assertion: |
| if (count == 0 && buffer != null) { |
| throw new IllegalArgumentException(); |
| } |
| */ |
| |
| this.buffer = buffer; |
| this.count = count; |
| } |
| |
| TemplateElement[] getBuffer() { |
| return buffer; |
| } |
| |
| int getCount() { |
| return count; |
| } |
| |
| TemplateElement getFirst() { |
| return buffer != null ? buffer[0] : null; |
| } |
| |
| TemplateElement getLast() { |
| return buffer != null ? buffer[count - 1] : null; |
| } |
| |
| /** |
| * Used for some backward compatibility hacks. |
| */ |
| TemplateElement asSingleElement() { |
| if (count == 0) { |
| return new TextBlock(CollectionUtils.EMPTY_CHAR_ARRAY, false); |
| } else { |
| TemplateElement first = buffer[0]; |
| if (count == 1) { |
| return first; |
| } else { |
| MixedContent mixedContent = new MixedContent(); |
| mixedContent.setChildren(this); |
| mixedContent.setLocation(first.getTemplate(), first, getLast()); |
| return mixedContent; |
| } |
| } |
| } |
| |
| /** |
| * Used for some backward compatibility hacks. |
| */ |
| MixedContent asMixedContent() { |
| MixedContent mixedContent = new MixedContent(); |
| if (count != 0) { |
| TemplateElement first = buffer[0]; |
| mixedContent.setChildren(this); |
| mixedContent.setLocation(first.getTemplate(), first, getLast()); |
| } |
| return mixedContent; |
| } |
| |
| } |