Struts example source code file (ExpressionValidatorDescription.java)

This example Struts source code file (ExpressionValidatorDescription.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

expressionvalidator, expressionvalidatordescription, expressionvalidatordescription, io, printwriter, printwriter, string, string, stringwriter, stringwriter, unsupportedoperationexception, validatordescription

The Struts ExpressionValidatorDescription.java source code

/*
 * Copyright 2002-2006,2009 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 com.opensymphony.xwork2.validator.metadata;

import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * <code>ExpressionValidatorDescription
 *
 * @author Rainer Hermanns
 * @version $Id: ExpressionValidatorDescription.java 894090 2009-12-27 18:18:29Z martinc $
 */
public class ExpressionValidatorDescription implements ValidatorDescription {

    public String expression;
    public String key;
    public String message;
    public boolean shortCircuit;

    public void setExpression(String expression) {
        this.expression = expression;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public void setShortCircuit(boolean shortCircuit) {
        this.shortCircuit = shortCircuit;
    }

    /**
     * Returns the field name to create the validation rule for.
     *
     * @return The field name to create the validation rule for
     */
    public String getFieldName() {
        throw new UnsupportedOperationException("ExpressionValidator annotations cannot be applied to fields...");
    }

    public String asXml() {
        StringWriter sw = new StringWriter();
        PrintWriter writer = null;

        try {
            writer = new PrintWriter(sw);

            if ( shortCircuit) {
                writer.println("\t<validator type=\"expression\">");
            } else {
                writer.println("\t<validator type=\"expression\" short-circuit=\"true\">");
            }

            writer.println("\t\t<param name=\"expression\">" + expression+ "");

            if ( !"".equals(key)) {
                writer.println("\t\t<message key=\"" + key + "\">" + message + "");
            } else {
                writer.println("\t\t<message>" + message + "");
            }

            writer.println("\t</validator>");

        } finally {
            if (writer != null) {
                writer.flush();
                writer.close();
            }
        }
        return sw.toString();
    }

    public boolean isSimpleValidator() {
        return false;
    }
}