titletag.java

OS(OpenSymphony)的SiteMesh是一个用来在JSP中实现页面布局和装饰（layout and decoration）的框架组件

/*
 * Title:        TitleTag
 * Description:
 *
 * This software is published under the terms of the OpenSymphony Software
 * License version 1.1, of which a copy has been included with this
 * distribution in the LICENSE.txt file.
 */

package com.opensymphony.module.sitemesh.taglib.decorator;

import com.opensymphony.module.sitemesh.taglib.AbstractTag;

/**
 * Write the Page <code>&lt;title&gt;</code> value to out.
 *
 * @author <a href="[e-mail]">Joe Walnes</a>
 * @version $Revision: 1.3 $
 *
 * @see com.opensymphony.module.sitemesh.HTMLPage#getTitle()
 */
public class TitleTag extends AbstractTag {
    private String defaultTitle = null;

    /** Value to write if no title is found (optional). */
    public void setDefault(String defaultTitle) {
        this.defaultTitle = defaultTitle;
    }

    public final int doEndTag() {
        try {
            String title = getPage().getTitle();
            if (title == null || title.trim().length() == 0) title = defaultTitle;
            if (title != null) getOut().write(title);
        }
        catch (Exception e) {
            trace(e);
        }
        return EVAL_PAGE;
    }

}