| /* |
| * 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.polygene.serialization.javaxxml; |
| |
| import java.util.Optional; |
| import java.util.Spliterator; |
| import java.util.Spliterators; |
| import java.util.function.Consumer; |
| import java.util.stream.Stream; |
| import java.util.stream.StreamSupport; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| /** |
| * javax.xml utilities. |
| */ |
| public class JavaxXml |
| { |
| /** |
| * Find child elements. |
| * |
| * @param parent the parent node |
| * @return a stream of elements |
| */ |
| public static Stream<Element> childElements( Node parent ) |
| { |
| return toStream( parent.getChildNodes() ).filter( JavaxXml::isElement ) |
| .map( JavaxXml::castToElement ); |
| } |
| |
| /** |
| * Find the first child element. |
| * |
| * @param parent the parent node |
| * @return an optional element |
| */ |
| public static Optional<Element> firstChildElement( Node parent ) |
| { |
| return childElements( parent ).findFirst(); |
| } |
| |
| /** |
| * Find child elements named {@literal tagName}. |
| * |
| * @param parent the parent node |
| * @param tagName the tag name |
| * @return a stream of elements named {@literal tagName} |
| */ |
| public static Stream<Element> childElementsNamed( Node parent, String tagName ) |
| { |
| return childElements( parent ).filter( element -> tagName.equals( element.getTagName() ) ); |
| } |
| |
| /** |
| * Find the first child element named {@literal tagName}. |
| * |
| * @param parent the parent node |
| * @param tagName the tag name |
| * @return an optional element named {@literal tagName} |
| */ |
| public static Optional<Element> firstChildElementNamed( Node parent, String tagName ) |
| { |
| return childElementsNamed( parent, tagName ).findFirst(); |
| } |
| |
| /** |
| * Find child nodes holding state. |
| * |
| * @param parent the parent node |
| * @return a stream or child state nodes |
| */ |
| public static Stream<Node> stateChildNodes( Node parent ) |
| { |
| return toStream( parent.getChildNodes() ).filter( JavaxXml::isStateNode ); |
| } |
| |
| /** |
| * Find the first child node holding state. |
| * |
| * @param parent the parent node |
| * @return an optional child state node |
| */ |
| public static Optional<Node> firstStateChildNode( Node parent ) |
| { |
| return stateChildNodes( parent ).findFirst(); |
| } |
| |
| /** |
| * Test if a node holds state. |
| * |
| * Types of nodes holding state: |
| * <ul> |
| * <li>{@link Node#ELEMENT_NODE}</li> |
| * <li>{@link Node#CDATA_SECTION_NODE}</li> |
| * <li>{@link Node#TEXT_NODE}</li> |
| * </ul> |
| * |
| * @param node the node |
| * @return {@literal true} if {@literal node} holds state |
| */ |
| public static boolean isStateNode( Node node ) |
| { |
| switch( node.getNodeType() ) |
| { |
| case Node.ELEMENT_NODE: |
| case Node.CDATA_SECTION_NODE: |
| case Node.TEXT_NODE: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| private static boolean isElement( Node node ) |
| { |
| return node.getNodeType() == Node.ELEMENT_NODE; |
| } |
| |
| private static Element castToElement( Node node ) |
| { |
| return (Element) node; |
| } |
| |
| private static Stream<Node> toStream( NodeList nodeList ) |
| { |
| return StreamSupport.stream( new Spliterators.AbstractSpliterator<Node>( Long.MAX_VALUE, Spliterator.ORDERED ) |
| { |
| private int nextIndex = 0; |
| |
| @Override |
| public boolean tryAdvance( Consumer<? super Node> action ) |
| { |
| if( nextIndex >= nodeList.getLength() ) |
| { |
| return false; |
| } |
| action.accept( nodeList.item( nextIndex ) ); |
| nextIndex++; |
| return true; |
| } |
| }, false ); |
| } |
| |
| private JavaxXml() {} |
| } |