IOUtilities.java

/*
 *    Constellation - An open source and standard compliant SDI
 *    http://www.constellation-sdi.org
 *
 * Copyright 2014 Geomatys.
 *
 * 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.
 */

package org.constellation.admin.util;

import org.apache.sis.util.Static;
import org.geotoolkit.sld.xml.Specification.StyledLayerDescriptor;
import org.geotoolkit.sld.xml.StyleXmlIO;
import org.geotoolkit.style.MutableStyle;
import org.geotoolkit.xml.parameter.ParameterValueWriter;
import org.opengis.parameter.GeneralParameterValue;

import javax.xml.bind.JAXBException;
import javax.xml.stream.XMLStreamException;
import java.io.IOException;
import java.io.StringWriter;

import static org.apache.sis.util.ArgumentChecks.ensureNonNull;

/**
 * @author Fabien Bernard (Geomatys).
 * @version 0.9
 * @since 0.9
 */
public final class IOUtilities extends Static {

    /**
     * Transform a {@link MutableStyle} instance into a {@link String} instance.
     *
     * @param style
     *            the style to be written
     * @return a {@link String} instance
     * @throws IOException
     *             on error while writing {@link MutableStyle} XML
     */
    public static String writeStyle(final MutableStyle style) throws IOException {
        ensureNonNull("style", style);
        final StyleXmlIO util = new StyleXmlIO();
        try {
            final StringWriter sw = new StringWriter();
            util.writeStyle(sw, style, StyledLayerDescriptor.V_1_1_0);
            return sw.toString();
        } catch (JAXBException ex) {
            throw new IOException("An error occurred while writing MutableStyle XML.", ex);
        }
    }

    /**
     * Transform a {@link GeneralParameterValue} instance into a {@link String}
     * instance.
     *
     * @param parameter
     *            the parameter to be written
     * @return a {@link String} instance
     * @throws IOException
     *             on error while writing {@link GeneralParameterValue} XML
     */
    public static String writeParameter(final GeneralParameterValue parameter) throws IOException {
        ensureNonNull("parameter", parameter);
        try {
            final StringWriter sw = new StringWriter();
            final ParameterValueWriter writer = new ParameterValueWriter();
            writer.setOutput(sw);
            writer.write(parameter);
            return sw.toString();
        } catch (XMLStreamException ex) {
            throw new IOException("An error occurred while writing ParameterDescriptorGroup XML.", ex);
        }
    }
 }