org.springframework.oxm.support.SaxResourceUtils.java Source code

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Here is the source code for org.springframework.oxm.support.SaxResourceUtils.java

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/*
 * Copyright 2002-2012 the original author or authors.
 *
 * 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
 *
 *      https://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.
 */

package org.springframework.oxm.support;

import java.io.IOException;

import org.xml.sax.InputSource;

import org.springframework.core.io.Resource;
import org.springframework.lang.Nullable;

/**
 * Convenient utility methods for dealing with SAX.
 *
 * @author Arjen Poutsma
 * @author Juergen Hoeller
 * @since 3.0
 */
public abstract class SaxResourceUtils {

    /**
     * Create a SAX {@code InputSource} from the given resource.
     * <p>Sets the system identifier to the resource's {@code URL}, if available.
     * @param resource the resource
     * @return the input source created from the resource
     * @throws IOException if an I/O exception occurs
     * @see InputSource#setSystemId(String)
     * @see #getSystemId(org.springframework.core.io.Resource)
     */
    public static InputSource createInputSource(Resource resource) throws IOException {
        InputSource inputSource = new InputSource(resource.getInputStream());
        inputSource.setSystemId(getSystemId(resource));
        return inputSource;
    }

    /**
     * Retrieve the URL from the given resource as System ID.
     * <p>Returns {@code null} if it cannot be opened.
     */
    @Nullable
    private static String getSystemId(Resource resource) {
        try {
            return resource.getURI().toString();
        } catch (IOException ex) {
            return null;
        }
    }

}