| /* |
| * 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.TemplateModel; |
| import freemarker.template.TemplateModelException; |
| import freemarker.template.TemplateModelIterator; |
| import freemarker.template.TemplateSequenceModel; |
| |
| /** |
| * {@link TemplateModelIterator} that wraps a sequence, delaying calling any of its methods until it's actually needed. |
| * |
| * @since 2.3.29 |
| */ |
| class LazySequenceIterator implements TemplateModelIterator { |
| private final TemplateSequenceModel sequence; |
| private Integer size; |
| private int index = 0; |
| |
| LazySequenceIterator(TemplateSequenceModel sequence) throws TemplateModelException { |
| this.sequence = sequence; |
| |
| } |
| @Override |
| public TemplateModel next() throws TemplateModelException { |
| return sequence.get(index++); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (size == null) { |
| try { |
| size = sequence.size(); |
| } catch (TemplateModelException e) { |
| throw new RuntimeException("Error when getting sequence size", e); |
| } |
| } |
| return index < size; |
| } |
| } |