| /* |
| * 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 org.apache.axiom.core; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| final class AttributeIterator<T extends CoreAttribute,S> implements Iterator<S> { |
| private final Class<T> type; |
| private final Mapper<T,S> mapper; |
| private final Semantics semantics; |
| private CoreAttribute currentAttribute; |
| private CoreAttribute nextAttribute; |
| private boolean nextAttributeSet; |
| |
| private AttributeIterator(CoreAttribute firstAttribute, Class<T> type, Mapper<T,S> mapper, Semantics semantics) { |
| this.type = type; |
| this.mapper = mapper; |
| this.semantics = semantics; |
| nextAttribute = firstAttribute; |
| nextAttributeSet = true; |
| } |
| |
| static <T extends CoreAttribute,S> Iterator<S> create(CoreElement element, Class<T> type, Mapper<T,S> mapper, Semantics semantics) { |
| CoreAttribute attribute = element.coreGetFirstAttribute(); |
| while (attribute != null && !type.isInstance(attribute)) { |
| attribute = attribute.coreGetNextAttribute(); |
| } |
| if (attribute == null) { |
| return Collections.<S>emptyList().iterator(); |
| } else { |
| return new AttributeIterator<T,S>(attribute, type, mapper, semantics); |
| } |
| } |
| |
| public final boolean hasNext() { |
| if (!nextAttributeSet) { |
| CoreAttribute attribute = currentAttribute; |
| do { |
| attribute = attribute.coreGetNextAttribute(); |
| } while (attribute != null && !type.isInstance(attribute)); |
| nextAttribute = attribute; |
| nextAttributeSet = true; |
| } |
| return nextAttribute != null; |
| } |
| |
| public final S next() { |
| if (hasNext()) { |
| CoreAttribute attribute = nextAttribute; |
| currentAttribute = attribute; |
| nextAttribute = null; |
| nextAttributeSet = false; |
| return mapper.map(type.cast(attribute)); |
| } else { |
| throw new NoSuchElementException(); |
| } |
| } |
| |
| public final void remove() { |
| if (currentAttribute == null) { |
| throw new IllegalStateException(); |
| } else { |
| // Ensure that the next attribute is known before we remove the current one. |
| hasNext(); |
| currentAttribute.coreRemove(semantics); |
| currentAttribute = null; |
| } |
| } |
| } |