/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Copyright 2005 The Apache Software Foundation.

 *

 *  Licensed 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.

 *

 */

/*

 */

/*

 * $Id: Utils.java,v 1.2 2008/07/24 15:20:32 mullan Exp $

 */

package org.jcp.xml.dsig.internal.dom;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.io.IOException;

import java.util.*;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

/**

 * Miscellaneous static utility methods for use in JSR 105 RI.

 *

 * @author Sean Mullan

 */

public final class Utils {

    private Utils() {}

    public static byte[] readBytesFromStream(InputStream is)

        throws IOException {

        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 toNodeSet(Iterator i) {

        Set 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) == '#'));

    }

}