JDK14/Java14源码在线阅读

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 * DO NOT REMOVE OR ALTER!
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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
 *
 * 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.
 */
/*
 * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * $Id: Utils.java 1788465 2017-03-24 15:10:51Z coheigea $
 */
package org.jcp.xml.dsig.internal.dom;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.util.*;
import javax.xml.crypto.XMLCryptoContext;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * Miscellaneous static utility methods for use in JSR 105 RI.
 *
 */
public final class Utils {

    private Utils() {}

    public static byte[] readBytesFromStream(InputStream is)
        throws IOException
    {
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            byte[] buf = new byte[1024];
            while (true) {
                int read = is.read(buf);
                if (read == -1) { // EOF
                    break;
                }
                baos.write(buf, 0, read);
                if (read < 1024) {
                    break;
                }
            }
            return baos.toByteArray();
        }
    }

    /**
     * Converts an Iterator to a Set of Nodes, according to the XPath
     * Data Model.
     *
     * @param i the Iterator
     * @return the Set of Nodes
     */
    static Set<Node> toNodeSet(Iterator<?> i) {
        Set<Node> nodeSet = new HashSet<>();
        while (i.hasNext()) {
            Node n = (Node)i.next();
            nodeSet.add(n);
            // insert attributes nodes to comply with XPath
            if (n.getNodeType() == Node.ELEMENT_NODE) {
                NamedNodeMap nnm = n.getAttributes();
                for (int j = 0, length = nnm.getLength(); j < length; j++) {
                    nodeSet.add(nnm.item(j));
                }
            }
        }
        return nodeSet;
    }

    /**
     * Returns the ID from a same-document URI (ex: "#id")
     */
    public static String parseIdFromSameDocumentURI(String uri) {
        if (uri.length() == 0) {
            return null;
        }
        String id = uri.substring(1);
        if (id != null && id.startsWith("xpointer(id(")) {
            int i1 = id.indexOf('\'');
            int i2 = id.indexOf('\'', i1+1);
            id = id.substring(i1+1, i2);
        }
        return id;
    }

    /**
     * Returns true if uri is a same-document URI, false otherwise.
     */
    public static boolean sameDocumentURI(String uri) {
        return uri != null && (uri.length() == 0 || uri.charAt(0) == '#');
    }


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