001/*
002 * Copyright 2002-2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.oxm.support;
018
019import java.io.IOException;
020
021import org.xml.sax.InputSource;
022
023import org.springframework.core.io.Resource;
024
025/**
026 * Convenient utility methods for dealing with SAX.
027 *
028 * @author Arjen Poutsma
029 * @author Juergen Hoeller
030 * @since 3.0
031 */
032public abstract class SaxResourceUtils {
033
034        /**
035         * Create a SAX {@code InputSource} from the given resource.
036         * <p>Sets the system identifier to the resource's {@code URL}, if available.
037         * @param resource the resource
038         * @return the input source created from the resource
039         * @throws IOException if an I/O exception occurs
040         * @see InputSource#setSystemId(String)
041         * @see #getSystemId(org.springframework.core.io.Resource)
042         */
043        public static InputSource createInputSource(Resource resource) throws IOException {
044                InputSource inputSource = new InputSource(resource.getInputStream());
045                inputSource.setSystemId(getSystemId(resource));
046                return inputSource;
047        }
048
049        /**
050         * Retrieve the URL from the given resource as System ID.
051         * <p>Returns {@code null} if it cannot be opened.
052         */
053        private static String getSystemId(Resource resource) {
054                try {
055                        return resource.getURI().toString();
056                }
057                catch (IOException ex) {
058                        return null;
059                }
060        }
061
062}