frametag.java

structs源码

/*
 * $Id: FrameTag.java 471754 2006-11-06 14:55:09Z husted $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.struts.taglib.html;

import org.apache.struts.taglib.TagUtils;

import javax.servlet.jsp.JspException;

/**
 * Generate an HTML <code>&lt;frame&gt;</code> tag with similar capabilities
 * as those the <code>&lt;html:link&gt;</code> tag provides for hyperlink
 * elements.  The <code>src</code> element is rendered using the same
 * technique that {@link LinkTag} uses to render the <code>href</code>
 * attribute of a hyperlink.  Additionall, the HTML 4.0 frame tag attributes
 * <code>noresize</code>, <code>scrolling</code>, <code>marginheight</code>,
 * <code>marginwidth</code>, <code>frameborder</code>, and
 * <code>longdesc</code> are supported. The frame <code>name</code> attribute
 * is rendered based on the <code>frameName</code> property.
 *
 * Note that the value of <code>longdesc</code> is intended to be a URI, but
 * currently no rewriting is supported.  The attribute is set directly from
 * the property value.
 *
 * @version $Rev: 471754 $ $Date: 2004-10-16 12:38:42 -0400 (Sat, 16 Oct 2004)
 *          $
 * @since Struts 1.1
 */
public class FrameTag extends LinkTag {
    // ------------------------------------------------------------- Properties

    /**
     * The frameborder attribute that should be rendered (1, 0).
     */
    protected String frameborder = null;

    /**
     * The <code>name</code> attribute that should be rendered for this
     * frame.
     */
    protected String frameName = null;

    /**
     * URI of a long description of this frame (complements title).
     */
    protected String longdesc = null;

    /**
     * The margin height in pixels, or zero for no setting.
     */
    protected Integer marginheight = null;

    /**
     * The margin width in pixels, or null for no setting.
     */
    protected Integer marginwidth = null;

    /**
     * Should users be disallowed to resize the frame?
     */
    protected boolean noresize = false;

    /**
     * What type of scrolling should be supported (yes, no, auto)?
     */
    protected String scrolling = null;

    public String getFrameborder() {
        return (this.frameborder);
    }

    public void setFrameborder(String frameborder) {
        this.frameborder = frameborder;
    }

    public String getFrameName() {
        return (this.frameName);
    }

    public void setFrameName(String frameName) {
        this.frameName = frameName;
    }

    public String getLongdesc() {
        return (this.longdesc);
    }

    public void setLongdesc(String longdesc) {
        this.longdesc = longdesc;
    }

    public Integer getMarginheight() {
        return (this.marginheight);
    }

    public void setMarginheight(Integer marginheight) {
        this.marginheight = marginheight;
    }

    public Integer getMarginwidth() {
        return (this.marginwidth);
    }

    public void setMarginwidth(Integer marginwidth) {
        this.marginwidth = marginwidth;
    }

    public boolean getNoresize() {
        return (this.noresize);
    }

    public void setNoresize(boolean noresize) {
        this.noresize = noresize;
    }

    public String getScrolling() {
        return (this.scrolling);
    }

    public void setScrolling(String scrolling) {
        this.scrolling = scrolling;
    }

    // --------------------------------------------------------- Public Methods

    /**
     * Render the appropriately encoded URI.
     *
     * @throws JspException if a JSP exception has occurred
     */
    public int doEndTag() throws JspException {
        // Print this element to our output writer
        StringBuffer results = new StringBuffer("<frame");

        prepareAttribute(results, "src", calculateURL());
        prepareAttribute(results, "name", getFrameName());

        if (noresize) {
            results.append(" noresize=\"noresize\"");
        }

        prepareAttribute(results, "scrolling", getScrolling());
        prepareAttribute(results, "marginheight", getMarginheight());
        prepareAttribute(results, "marginwidth", getMarginwidth());
        prepareAttribute(results, "frameborder", getFrameborder());
        prepareAttribute(results, "longdesc", getLongdesc());
        results.append(prepareStyles());
        prepareOtherAttributes(results);
        results.append(getElementClose());
        TagUtils.getInstance().write(pageContext, results.toString());

        return (EVAL_PAGE);
    }

    /**
     * Release any acquired resources.
     */
    public void release() {
        super.release();
        frameborder = null;
        frameName = null;
        longdesc = null;
        marginheight = null;
        marginwidth = null;
        noresize = false;
        scrolling = null;
    }
}