commons-email2-jakarta/src/main/java/org/apache/commons/mail2/jakarta/resolver/DataSourceUrlResolver.java [34:115]:
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public class DataSourceUrlResolver extends DataSourceBaseResolver {

    /** The base url of the resource when resolving relative paths */
    private final URL baseUrl;

    /**
     * Constructs a new instance.
     *
     * @param baseUrl the base URL used for resolving relative resource locations
     */
    public DataSourceUrlResolver(final URL baseUrl) {
        this.baseUrl = baseUrl;
    }

    /**
     * Constructs a new instance.
     *
     * @param baseUrl the base URL used for resolving relative resource locations
     * @param lenient shall we ignore resources not found or complain with an exception
     */
    public DataSourceUrlResolver(final URL baseUrl, final boolean lenient) {
        super(lenient);
        this.baseUrl = baseUrl;
    }

    /**
     * Create an URL based on a base URL and a resource location suitable for loading the resource.
     *
     * @param resourceLocation a resource location
     * @return the corresponding URL
     * @throws java.net.MalformedURLException creating the URL failed
     */
    protected URL createUrl(final String resourceLocation) throws MalformedURLException {
        // if we get an non-existing base url than the resource can
        // be directly used to create an URL
        if (baseUrl == null) {
            return new URL(resourceLocation);
        }
        // if we get an non-existing location what we shall do?
        if (EmailUtils.isEmpty(resourceLocation)) {
            throw new IllegalArgumentException("No resource defined");
        }
        // if we get a stand-alone resource than ignore the base url
        if (isFileUrl(resourceLocation) || isHttpUrl(resourceLocation)) {
            return new URL(resourceLocation);
        }
        return new URL(getBaseUrl(), resourceLocation.replace("&", "&"));
    }

    /**
     * Gets the base URL used for resolving relative resource locations.
     *
     * @return the baseUrl
     */
    public URL getBaseUrl() {
        return baseUrl;
    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation) throws IOException {
        return resolve(resourceLocation, isLenient());
    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation, final boolean isLenient) throws IOException {
        DataSource result = null;
        try {
            if (!isCid(resourceLocation)) {
                result = new URLDataSource(createUrl(resourceLocation));
                // validate we can read.
                try (InputStream inputStream = result.getInputStream()) {
                    inputStream.read();
                }
            }
            return result;
        } catch (final IOException e) {
            if (isLenient) {
                return null;
            }
            throw e;
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commons-email2-javax/src/main/java/org/apache/commons/mail2/javax/resolver/DataSourceUrlResolver.java [34:115]:
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public class DataSourceUrlResolver extends DataSourceBaseResolver {

    /** The base url of the resource when resolving relative paths */
    private final URL baseUrl;

    /**
     * Constructs a new instance.
     *
     * @param baseUrl the base URL used for resolving relative resource locations
     */
    public DataSourceUrlResolver(final URL baseUrl) {
        this.baseUrl = baseUrl;
    }

    /**
     * Constructs a new instance.
     *
     * @param baseUrl the base URL used for resolving relative resource locations
     * @param lenient shall we ignore resources not found or complain with an exception
     */
    public DataSourceUrlResolver(final URL baseUrl, final boolean lenient) {
        super(lenient);
        this.baseUrl = baseUrl;
    }

    /**
     * Create an URL based on a base URL and a resource location suitable for loading the resource.
     *
     * @param resourceLocation a resource location
     * @return the corresponding URL
     * @throws java.net.MalformedURLException creating the URL failed
     */
    protected URL createUrl(final String resourceLocation) throws MalformedURLException {
        // if we get an non-existing base url than the resource can
        // be directly used to create an URL
        if (baseUrl == null) {
            return new URL(resourceLocation);
        }
        // if we get an non-existing location what we shall do?
        if (EmailUtils.isEmpty(resourceLocation)) {
            throw new IllegalArgumentException("No resource defined");
        }
        // if we get a stand-alone resource than ignore the base url
        if (isFileUrl(resourceLocation) || isHttpUrl(resourceLocation)) {
            return new URL(resourceLocation);
        }
        return new URL(getBaseUrl(), resourceLocation.replace("&", "&"));
    }

    /**
     * Gets the base URL used for resolving relative resource locations.
     *
     * @return the baseUrl
     */
    public URL getBaseUrl() {
        return baseUrl;
    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation) throws IOException {
        return resolve(resourceLocation, isLenient());
    }

    /** {@inheritDoc} */
    @Override
    public DataSource resolve(final String resourceLocation, final boolean isLenient) throws IOException {
        DataSource result = null;
        try {
            if (!isCid(resourceLocation)) {
                result = new URLDataSource(createUrl(resourceLocation));
                // validate we can read.
                try (InputStream inputStream = result.getInputStream()) {
                    inputStream.read();
                }
            }
            return result;
        } catch (final IOException e) {
            if (isLenient) {
                return null;
            }
            throw e;
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