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/*
* Copyright 2000-2021 Vaadin Ltd.
*
* 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 com.vaadin.ui.renderers;
import com.vaadin.shared.ui.grid.renderers.TextRendererState;
import elemental.json.Json;
import elemental.json.JsonValue;
/**
* A renderer for presenting a plain text representation of any value.
* {@link Object#toString()} is used for determining the text to show.
*
* @since 7.4
* @author Vaadin Ltd
*/
public class TextRenderer extends AbstractRenderer<Object, Object> {
/**
* Creates a new text renderer that uses <code>""</code> to represent null
* values.
*/
public TextRenderer() {
this("");
}
/**
* Creates a new text renderer with the given string to represent null
* values.
*
* @param nullRepresentation
* the textual representation of {@code null} value
*/
public TextRenderer(String nullRepresentation) {
super(Object.class, nullRepresentation);
}
@Override
public JsonValue encode(Object value) {
if (value == null) {
return super.encode(null);
}
String stringValue = value.toString();
if (stringValue == null) {
return super.encode(null);
}
return Json.create(stringValue);
}
@Override
public String getNullRepresentation() {
return super.getNullRepresentation();
}
@Override
protected TextRendererState getState() {
return (TextRendererState) super.getState();
}
@Override
protected TextRendererState getState(boolean markAsDirty) {
return (TextRendererState) super.getState(markAsDirty);
}
}
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