org.obiba.opal.web.gwt.app.client.ui.celltable.LinkCell.java Source code

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Here is the source code for org.obiba.opal.web.gwt.app.client.ui.celltable.LinkCell.java

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/*
 * Copyright (c) 2013 OBiBa. All rights reserved.
 *
 * This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.obiba.opal.web.gwt.app.client.ui.celltable;

import com.google.common.base.Strings;
import com.google.gwt.cell.client.AbstractCell;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;

/**
 * A cell that renders a icon.
 *
 * @param <C> the type that this Cell represents
 */
public abstract class LinkCell<C> extends AbstractCell<C> {

    public LinkCell() {
    }

    /**
     * Method to be overridden in order to enable dynamically the icon. Default is enabled.
     *
     * @return
     */
    public boolean isEnabled() {
        return true;
    }

    /**
     * Get the href attribute value.
     *
     * @param value
     * @return
     */
    public abstract String getLink(C value);

    /**
     * Get the text of the link.
     * @param value
     * @return
     */
    public String getText(C value) {
        return value == null ? "" : value.toString();
    }

    @Override
    public void render(Context context, C value, SafeHtmlBuilder sb) {
        String link = getLink(value);
        if (isEnabled() && !Strings.isNullOrEmpty(link)) {
            sb.append(SafeHtmlUtils.fromSafeConstant("<a href=\"" + link + "\">"))
                    .appendHtmlConstant(getText(value)).append(SafeHtmlUtils.fromSafeConstant("</a>"));
        } else {
            sb.append(SafeHtmlUtils.fromSafeConstant(getText(value)));
        }
    }
}