JDK8/Java8源码在线阅读

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/**
 * 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
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 * http://www.apache.org/licenses/LICENSE-2.0
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 * 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
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/*
 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * $Id: DOMStructure.java 1197150 2011-11-03 14:34:57Z coheigea $
 */
package org.jcp.xml.dsig.internal.dom;

import javax.xml.crypto.MarshalException;
import javax.xml.crypto.XMLStructure;
import javax.xml.crypto.dom.DOMCryptoContext;
import org.w3c.dom.Node;

/**
 * DOM-based abstract implementation of XMLStructure.
 *
 * @author Sean Mullan
 */
public abstract class DOMStructure implements XMLStructure {

    public final boolean isFeatureSupported(String feature) {
        if (feature == null) {
            throw new NullPointerException();

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