/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
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.
/**
 * 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.
/**
 * 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.
Params:
i – the Iterator
Returns:
the Set of Nodes/**
     * 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")
/**
     * 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.
/**
     * 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) == '#');
    }

    static boolean secureValidation(XMLCryptoContext xc) {
        if (xc == null) {
            return false;
        }
        return getBoolean(xc, "org.jcp.xml.dsig.secureValidation");
    }

    private static boolean getBoolean(XMLCryptoContext xc, String name) {
        Boolean value = (Boolean)xc.getProperty(name);
        return value != null && value.booleanValue();
    }
}