exporttag.java

分页查询控件 分页查询控件

/*
 * Copyright 2004 original author or authors.
 *
 * 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 org.extremecomponents.table.tag;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.commons.lang.StringUtils;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.extremecomponents.table.bean.Attributes;
import org.extremecomponents.table.bean.Export;

/**
 * @jsp.tag name="export" display-name="ExportTag" body-content="JSP"
 *          description="Export data to a given view. For example pdf or xls."
 * 
 * @author Jeff Johnston
 */
public class ExportTag extends TagSupport implements ExtendedAttributes {
    private static final long serialVersionUID = -1873036948474547010L;

    private String fileName;
    private String view;
    private String tooltip;

    /**
     * @jsp.attribute description="The name of the export file. Example
     *                presidents.pdf" required="true" rtexprvalue="true"
     */
    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    /**
     * @jsp.attribute description="The type of the export. Types are pdf, xls,
     *                or csv. Works with the View interface." required="false"
     *                rtexprvalue="true"
     */
    public String getView() {
        return view;
    }

    public void setView(String view) {
        this.view = view;
    }

    /**
     * @jsp.attribute description="The tooltip that shows up when you mouseover
     *                the export image." required="false" rtexprvalue="true"
     */
    public String getTooltip() {
        if (StringUtils.isBlank(tooltip)) {
            return fileName;
        }

        return tooltip;
    }

    public void setTooltip(String tooltip) {
        this.tooltip = tooltip;
    }

    public int doEndTag()
            throws JspException {
        TableTag tableTag = (TableTag) findAncestorWithClass(this, TableTag.class);

        if (tableTag.getRowCount() > 0) //only go through the first pass
        {
            return EVAL_PAGE;
        }

        if (fileName != null) {
            setFileName((String) ExpressionEvaluatorManager.evaluate("fileName", fileName, java.lang.String.class, pageContext));
        }

        if (tooltip != null) {
            setTooltip((String) ExpressionEvaluatorManager.evaluate("tooltip", tooltip, java.lang.String.class, pageContext));
        }

        Export export = new Export();
        export.addAttribute(Export.FILE_NAME, getFileName());
        export.addAttribute(Export.VIEW, getView());
        export.addAttribute(Export.TOOLTIP, getTooltip());
        addExtendedAttributes(export);
        tableTag.addExport(export);

        return EVAL_PAGE;
    }

    public void addExtendedAttributes(Attributes attributes)
            throws JspException {
    }

    public void release() {
        fileName = null;
        view = null;
        tooltip = null;
        super.release();
    }
}