fr.putnami.pwt.core.widget.client.helper.EnumRenderer.java Source code

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Here is the source code for fr.putnami.pwt.core.widget.client.helper.EnumRenderer.java

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/**
 * This file is part of pwt.
 *
 * pwt is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * pwt is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with pwt. If not,
 * see <http://www.gnu.org/licenses/>.
 */
package fr.putnami.pwt.core.widget.client.helper;

import com.google.common.base.CaseFormat;
import com.google.gwt.text.shared.AbstractRenderer;

import fr.putnami.pwt.core.editor.client.helper.MessageHelper;

public final class EnumRenderer<E extends Enum<E>> extends AbstractRenderer<E> {

    public static final String ENUM_SUFFIX = "Enum";

    private final MessageHelper messageHelper;

    public EnumRenderer(MessageHelper messageHelper) {
        super();
        this.messageHelper = messageHelper;
    }

    public String getEnumKey(E value) {
        if (value == null) {
            return null;
        }
        StringBuilder result = new StringBuilder();
        result.append(CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_CAMEL, this.getSimpleClassName(value)));
        result.append(CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, value.toString()));
        result.append(EnumRenderer.ENUM_SUFFIX);
        return result.toString();
    }

    private String getSimpleClassName(E value) {
        String result = value.getClass().getSimpleName();
        if (result.indexOf("$") != -1) {
            // In case of inner class
            result = result.substring(result.indexOf("$") + 1);
        }
        return result;
    }

    @Override
    public String render(E object) {
        if (object == null) {
            return "";
        }

        if (this.messageHelper != null) {
            String result = this.messageHelper.findMessage(object.getClass(), this.getEnumKey(object));
            if (result != null) {
                return result;
            }
        }

        return object.toString();
    }
}