parametertag.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.taglibs.standard.lang.support.ExpressionEvaluatorManager;

/**
 * @jsp.tag name="parameter" display-name="ParameterTag" body-content="JSP"
 *          description="Append any attributes to the Sorting, Filtering,
 *          Pagination, and Form Submission. On the URL's will resolve to
 *          &name=value. On the <form>attribute will be added as hidden fields
 *          <input type=hidden name= value=>"
 * 
 * @author Jeff Johnston
 */
public class ParameterTag extends TagSupport {
    private static final long serialVersionUID = -6070688770478276772L;
    
    private String name;
    private String value;

    /**
     * @jsp.attribute description="The name of the parameter." required="true"
     *                rtexprvalue="true"
     */
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    /**
     * @jsp.attribute description="The value of the parameter." required="true"
     *                rtexprvalue="true"
     */
    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    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 (value != null) {
            setValue((String) ExpressionEvaluatorManager.evaluate("value", value.toString(), String.class, this, pageContext));
        }

        tableTag.addParameter(getName(), getValue());

        return EVAL_PAGE;
    }

    public void release() {
        name = null;
        value = null;
        super.release();
    }
}