org.apache.taglibs.standard.tag.common.sql.ParamTagSupport Maven / Gradle / Ivy

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/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
 * Copyright 2004 The Apache Software Foundation
 *
 * 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.apache.taglibs.standard.tag.common.sql;

import jakarta.servlet.jsp.JspException;
import jakarta.servlet.jsp.JspTagException;
import jakarta.servlet.jsp.jstl.sql.SQLExecutionTag;
import jakarta.servlet.jsp.tagext.BodyTagSupport;

import org.apache.taglibs.standard.resources.Resources;


/**
 * Tag handler for <Param> in JSTL, used to set
 * parameter values for a SQL statement.
 * 
 * @author Hans Bergsten
 */

public abstract class ParamTagSupport extends BodyTagSupport {
    protected Object value;

    //*********************************************************************
    // Tag logic

    public int doEndTag() throws JspException {
	SQLExecutionTag parent = (SQLExecutionTag) 
	    findAncestorWithClass(this, SQLExecutionTag.class);
	if (parent == null) {
	    throw new JspTagException(
                Resources.getMessage("SQL_PARAM_OUTSIDE_PARENT"));
	}

	Object paramValue = null;
	if (value != null) {
	    paramValue = value;
	}
	else if (bodyContent != null) {
	    paramValue = bodyContent.getString().trim();
	    if (((String) paramValue).trim().length() == 0) {
		paramValue = null;
	    }
	}

	parent.addSQLParameter(paramValue);
	return EVAL_PAGE;
    }
}