stringlengthfieldvalidator.java

在Struts2中的jar包xwork的源代码.版本为2.0.7

/*
 * Copyright (c) 2002-2006 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.xwork2.validator.validators;

import com.opensymphony.xwork2.validator.ValidationException;

/**
 * <!-- START SNIPPET: javadoc -->
 * StringLengthFieldValidator checks that a String field is of a certain length.  If the "minLength"
 * parameter is specified, it will make sure that the String has at least that many characters.  If
 * the "maxLength" parameter is specified, it will make sure that the String has at most that many
 * characters.  The "trim" parameter determines whether it will {@link String#trim() trim} the
 * String before performing the length check.  If unspecified, the String will be trimmed.
 * <!-- END SNIPPET: javadoc -->
 * <p/>
 * 
 * 
 * <!-- START SNIPPET: parameters -->
 * <ul>
 * 	  <li>fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required</li>
 *    <li>maxLength - The max length of the field value. Default ignore.</li>
 *    <li>minLength - The min length of the field value. Default ignore.</li>
 *    <li>trim - Trim the field value before evaluating its min/max length. Default true</li>
 * </ul>
 * <!-- END SNIPPET: parameters -->
 * 
 * 
 * <pre>
 * <!--START SNIPPET: example -->
 *		&lt;validators&gt;
 *          &lt;!-- Plain Validator Syntax --&gt;
 * 			&lt;validator type="stringlength"&gt;
 * 				&lt;param name="fieldName"&gt;myPurchaseCode&lt;/param&gt;
 * 				&lt;param name="minLength"&gt;10&lt;/param&gt;
 *              &lt;param name="maxLength"&gt;10&lt;/param&gt;
 *              &lt;param name="trim"&gt;true&lt;/param&gt;
 *              &lt;message&gt;Your purchase code needs to be 10 characters long&lt;/message&gt;		
 *          &lt;/validator&gt;
 * 
 * 			&lt;!-- Field Validator Syntax --&gt;
 * 			&lt;field name="myPurchaseCode"&gt;
 * 				&lt;param name="minLength"&gt;10&lt;/param&gt;
 *              &lt;param name="maxLength&gt;10&lt;/param&gt;
 *              &lt;param name="trim"&gt;true&lt;/param&gt;
 *              &lt;message&gt;Your purchase code needs to be 10 characters long&lt;/message&gt;
 * 			&lt;/field-name&gt;
 *      &lt;/validators&gt;
 * <!-- END SNIPPET: example -->
 * </pre>
 * 
 *
 * @author Jason Carreira
 * @author Mark Woon
 * @author tmjee
 * @version $Date: 2006-10-05 17:39:20 +0200 (Do, 05 Okt 2006) $ $Id: StringLengthFieldValidator.java 1152 2006-10-05 15:39:20Z tm_jee $
 */
public class StringLengthFieldValidator extends FieldValidatorSupport {

    private boolean doTrim = true;
    private int maxLength = -1;
    private int minLength = -1;


    public void setMaxLength(int maxLength) {
        this.maxLength = maxLength;
    }

    public int getMaxLength() {
        return maxLength;
    }

    public void setMinLength(int minLength) {
        this.minLength = minLength;
    }

    public int getMinLength() {
        return minLength;
    }

    public void setTrim(boolean trim) {
        doTrim = trim;
    }

    public boolean getTrim() {
        return doTrim;
    }

    public void validate(Object object) throws ValidationException {
        String fieldName = getFieldName();
        String val = (String) getFieldValue(fieldName, object);

        if (val == null || val.length() <= 0) {
            // use a required validator for these
            return;
        }
        if (doTrim) {
            val = val.trim();
            if (val.length() <= 0) { 
            	// use a required validator
            	return;
            }
        }

        if ((minLength > -1) && (val.length() < minLength)) {
            addFieldError(fieldName, object);
        } else if ((maxLength > -1) && (val.length() > maxLength)) {
            addFieldError(fieldName, object);
        }
    }
}