--- old/src/sample/nashorn/dynalink/DOMLinkerExporter.java 2020-04-15 18:53:11.000000000 +0530 +++ /dev/null 2020-04-15 18:53:11.000000000 +0530 @@ -1,162 +0,0 @@ -/* - * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * - Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * - Neither the name of Oracle nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS - * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, - * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR - * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -import java.lang.invoke.MethodHandle; -import java.lang.invoke.MethodHandles; -import java.lang.invoke.MethodType; -import java.util.ArrayList; -import java.util.List; -import jdk.dynalink.CallSiteDescriptor; -import jdk.dynalink.NamedOperation; -import jdk.dynalink.NamespaceOperation; -import jdk.dynalink.Operation; -import jdk.dynalink.StandardNamespace; -import jdk.dynalink.StandardOperation; -import jdk.dynalink.linker.GuardedInvocation; -import jdk.dynalink.linker.GuardingDynamicLinker; -import jdk.dynalink.linker.GuardingDynamicLinkerExporter; -import jdk.dynalink.linker.LinkRequest; -import jdk.dynalink.linker.LinkerServices; -import jdk.dynalink.linker.TypeBasedGuardingDynamicLinker; -import jdk.dynalink.linker.support.Guards; -import jdk.dynalink.linker.support.Lookup; -import org.w3c.dom.Element; -import org.w3c.dom.Node; -import org.w3c.dom.NodeList; - -/** - * This is a dynalink pluggable linker (see http://openjdk.java.net/jeps/276). - * This linker handles XML DOM Element objects specially. This linker links - * special properties starting with "_" and treats those as child element names - * to access. This kind of child element access makes it easy to write XML DOM - * accessing scripts. See for example ./dom_linker_gutenberg.js. - */ -public final class DOMLinkerExporter extends GuardingDynamicLinkerExporter { - static { - System.out.println("pluggable dynalink DOM linker loaded"); - } - - // return List of child Elements of the given Element matching the given name. - private static List getChildElements(final Element elem, final String name) { - final NodeList nodeList = elem.getChildNodes(); - final List childElems = new ArrayList<>(); - final int len = nodeList.getLength(); - for (int i = 0; i < len; i++) { - final Node node = nodeList.item(i); - if (node.getNodeType() == Node.ELEMENT_NODE && - ((Element)node).getTagName().equals(name)) { - childElems.add((Element)node); - } - } - return childElems; - } - - // method that returns either unique child element matching given name - // or a list of child elements of that name (if there are more than one matches). - public static Object getElementsByName(final Object elem, final String name) { - final List elems = getChildElements((Element)elem, name); - return elems.size() == 1? elems.get(0) : elems; - } - - // method to extract text context under a given DOM Element - public static Object getElementText(final Object elem) { - final NodeList nodeList = ((Element)elem).getChildNodes(); - final int len = nodeList.getLength(); - final StringBuilder text = new StringBuilder(); - for (int i = 0; i < len; i++) { - final Node node = nodeList.item(i); - if (node.getNodeType() == Node.TEXT_NODE) { - text.append(node.getNodeValue()); - } - } - return text.toString(); - } - - private static final MethodHandle ELEMENTS_BY_NAME; - private static final MethodHandle ELEMENT_TEXT; - private static final MethodHandle IS_ELEMENT; - static { - ELEMENTS_BY_NAME = Lookup.PUBLIC.findStatic(DOMLinkerExporter.class, - "getElementsByName", - MethodType.methodType(Object.class, Object.class, String.class)); - ELEMENT_TEXT = Lookup.PUBLIC.findStatic(DOMLinkerExporter.class, - "getElementText", - MethodType.methodType(Object.class, Object.class)); - IS_ELEMENT = Guards.isInstance(Element.class, MethodType.methodType(Boolean.TYPE, Object.class)); - } - - @Override - public List get() { - final ArrayList linkers = new ArrayList<>(); - linkers.add(new TypeBasedGuardingDynamicLinker() { - @Override - public boolean canLinkType(final Class type) { - return Element.class.isAssignableFrom(type); - } - - @Override - public GuardedInvocation getGuardedInvocation(final LinkRequest request, - final LinkerServices linkerServices) throws Exception { - final Object self = request.getReceiver(); - if (! (self instanceof Element)) { - return null; - } - - final CallSiteDescriptor desc = request.getCallSiteDescriptor(); - final Operation op = desc.getOperation(); - final Object name = NamedOperation.getName(op); - final boolean getProp = NamespaceOperation.contains( - NamedOperation.getBaseOperation(op), - StandardOperation.GET, StandardNamespace.PROPERTY); - if (getProp && name instanceof String) { - final String nameStr = (String)name; - - // Treat names starting with "_" as special names. - // Everything else is linked other dynalink bean linker! - // This avoids collision with Java methods of org.w3c.dom.Element class - // Assumption is that Java APIs won't start with "_" character!! - if (nameStr.equals("_")) { - // short-hand to get text content under a given DOM Element - return new GuardedInvocation(ELEMENT_TEXT, IS_ELEMENT); - } else if (nameStr.startsWith("_")) { - return new GuardedInvocation( - MethodHandles.insertArguments(ELEMENTS_BY_NAME, 1, nameStr.substring(1)), - IS_ELEMENT); - } - - } - - return null; - } - }); - return linkers; - } -}