jasper/jasper2/src/share/org/apache/jasper/tagplugins/jstl/If.java

/*
 * Copyright 1999,2004 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.jasper.tagplugins.jstl;

import org.apache.jasper.compiler.tagplugin.*;

public final class If implements TagPlugin {

    public void doTag(TagPluginContext ctxt) {
	String condV = ctxt.getTemporaryVariableName();
	ctxt.generateJavaSource("boolean " + condV + "=");
	ctxt.generateAttribute("test");
	ctxt.generateJavaSource(";");
	if (ctxt.isAttributeSpecified("var")) {
	    String scope = "PageContext.PAGE_SCOPE";
	    if (ctxt.isAttributeSpecified("scope")) {
		String scopeStr = ctxt.getConstantAttribute("scope");
		if ("request".equals(scopeStr)) {
		    scope = "PageContext.REQUEST_SCOPE";
		} else if ("session".equals(scopeStr)) {
		    scope = "PageContext.SESSION_SCOPE";
		} else if ("application".equals(scopeStr)) {
		    scope = "PageContext.APPLICATION_SCOPE";
		}
	    }
	    ctxt.generateJavaSource("_jspx_page_context.setAttribute(");
	    ctxt.generateAttribute("var");
	    ctxt.generateJavaSource(", new Boolean(" + condV + ")," + scope + ");");
	}
	ctxt.generateJavaSource("if (" + condV + "){");
	ctxt.generateBody();
	ctxt.generateJavaSource("}");
    }
}