author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 35337 | jaxp/src/java.xml/share/classes/javax/xml/xpath/XPathEvaluationResult.java@2ba279bcff39 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.xml.xpath; |
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import java.util.Objects; |
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import javax.xml.namespace.QName; |
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import org.w3c.dom.Node; |
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/** |
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* The {@code XPathEvaluationResult} interface represents the result of the |
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* evaluation of an XPath expression within the context of a particular node. |
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* The evaluation of an XPath expression can result in various result types as |
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* defined in XML Path Language (XPath) Version 1.0. |
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* |
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* @param <T> the object type returned by the XPath evaluation. |
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* @see <a href="http://www.w3.org/TR/xpath">XML Path Language (XPath) Version |
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* 1.0</a> |
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* |
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* @since 9 |
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*/ |
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public interface XPathEvaluationResult<T> { |
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/** |
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* XPathResultType represents possible return types of an XPath evaluation. |
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* Provided as an enum type, it allows the use of switch statement. At the |
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* same time, a mapping is provided between the original QName types in |
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* {@link XPathConstants} and class types used in the generic methods. |
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*/ |
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public static enum XPathResultType { |
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/** |
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* Any type that represents any of the 5 other types listed below. |
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* Maps to {@link XPathEvaluationResult}. |
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*/ |
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ANY(new QName("http://www.w3.org/1999/XSL/Transform", "any"), XPathEvaluationResult.class), |
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/** |
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* The XPath 1.0 boolean data type. Maps to Java {@link Boolean}. |
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*/ |
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BOOLEAN(XPathConstants.BOOLEAN, Boolean.class), |
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/** |
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* The XPath 1.0 Number data type. Maps to Java {@link Number}. Of the |
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* subtypes of Number, only Double, Integer and Long are required. |
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*/ |
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NUMBER(XPathConstants.NUMBER, Number.class), |
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/** |
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* The XPath 1.0 String data type. Maps to Java {@link String}. |
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*/ |
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STRING(XPathConstants.STRING, String.class), |
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/** |
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* The XPath 1.0 NodeSet data type. Maps to {@link org.w3c.dom.NodeList}. |
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*/ |
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NODESET(XPathConstants.NODESET, XPathNodes.class), |
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/** |
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* The XPath 1.0 NodeSet data type. Maps to {@link org.w3c.dom.Node}. |
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*/ |
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NODE(XPathConstants.NODE, Node.class); |
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final QName qnameType; |
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final Class<?> clsType; |
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XPathResultType(QName qnameType, Class<?> clsType) { |
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this.qnameType = qnameType; |
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this.clsType = clsType; |
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} |
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/** |
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* Compares this type to the specified class type. |
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* @param clsType class type |
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* @return true if the argument is not null and is a class type that |
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* matches that this type represents, false otherwise. |
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*/ |
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private boolean equalsClassType(Class<?> clsType) { |
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Objects.nonNull(clsType); |
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if (clsType.isAssignableFrom(this.clsType)) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Returns the QName type as specified in {@link XPathConstants} that |
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* corresponds to the specified class type. |
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* @param clsType a class type that the enum type supports |
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* @return the QName type that matches with the specified class type, |
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* null if there is no match |
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*/ |
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static public QName getQNameType(Class<?> clsType) { |
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for (XPathResultType type : XPathResultType.values()) { |
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if (type.equalsClassType(clsType)) { |
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return type.qnameType; |
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} |
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} |
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return null; |
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} |
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} |
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/** |
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* Return the result type as an enum specified by {@code XPathResultType} |
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* @return the result type |
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*/ |
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public XPathResultType type(); |
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/** |
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* Returns the value of the result as the type {@code <T>} specified for the class. |
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* |
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* @return The value of the result. |
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*/ |
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public T value(); |
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} |