/*******************************************************************************
 * Copyright 2014, 2017 gwt-ol3
 *
 * 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 ol.source;

import jsinterop.annotations.JsOverlay;
import jsinterop.annotations.JsPackage;
import jsinterop.annotations.JsProperty;
import jsinterop.annotations.JsType;
import ol.Size;

/**
 * @author Tino Desjardins
 */
@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Object")
public class ImageWmsParams {

    @JsOverlay
    public static String DELIMITER = ",";

    @JsProperty(name = "LAYERS")
    public native void setLayers(String layers);

    @JsOverlay
    public final void setLayers(String... layerNames) {
        setLayers(String.join(ImageWmsParams.DELIMITER, layerNames));
    }

    @JsProperty(name = "LAYERS")
    public native String getLayers();

    @JsProperty(name = "WIDTH")
    public native void setWidth(int width);

    @JsProperty(name = "HEIGHT")
    public native void setHeight(int height);

    @JsOverlay
    public final void setSize(Size size) {
        setWidth(size.getWidth());
        setHeight(size.getHeight());
    }

    @JsProperty(name = "VERSION")
    public native void setVersion(String version);

}

/*******************************************************************************
 * Copyright 2014, 2017 gwt-ol3
 *
 * 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 ol.source;

import jsinterop.annotations.JsOverlay;
import jsinterop.annotations.JsPackage;
import jsinterop.annotations.JsProperty;
import jsinterop.annotations.JsType;
import ol.Size;

/**
 * @author Tino Desjardins
 */
@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Object")
public class ImageWmsParams {

    @JsOverlay
    public static final String DELIMITER = ",";

    @JsProperty(name = "LAYERS")
    public native void setLayers(String layers);

    @JsOverlay
    public final void setLayers(String... layerNames) {
        setLayers(String.join(ImageWmsParams.DELIMITER, layerNames));
    }

    @JsProperty(name = "LAYERS")
    public native String getLayers();

    @JsProperty(name = "WIDTH")
    public native void setWidth(int width);

    @JsProperty(name = "HEIGHT")
    public native void setHeight(int height);

    @JsOverlay
    public final void setSize(Size size) {
        setWidth(size.getWidth());
        setHeight(size.getHeight());
    }

    @JsProperty(name = "VERSION")
    public native void setVersion(String version);

}

Make delimiter constant final