com.myamamoto.wicket.misc.behavior.AppendErrorClassOnErrorBehavior.java Source code

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Here is the source code for com.myamamoto.wicket.misc.behavior.AppendErrorClassOnErrorBehavior.java

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/*
 * Copyright 2012 m_yamamo0417
 *
 * 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.myamamoto.wicket.misc.behavior;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.ComponentTag;

public class AppendErrorClassOnErrorBehavior extends Behavior {

    public static final String ATTRIBUTE_CLASS = "class";

    private final String errorClass;
    private final String errorClassWithComma;

    public AppendErrorClassOnErrorBehavior() {
        this("error");
    }

    public AppendErrorClassOnErrorBehavior(String errorClass) {
        if (null == errorClass) {
            throw new NullPointerException("errorClass is null");
        }
        if (errorClass.isEmpty()) {
            throw new IllegalArgumentException("errorClass is empty");
        }
        this.errorClass = errorClass;
        this.errorClassWithComma = ", " + errorClass;
    }

    @Override
    public void onComponentTag(Component arg0, ComponentTag arg1) {
        super.onComponentTag(arg0, arg1);
        String orgClass = arg1.getAttribute(ATTRIBUTE_CLASS);

        if (arg0.hasErrorMessage()) {
            String newClass;
            boolean existsOrgClass = null != orgClass && !orgClass.isEmpty();
            if (existsOrgClass) {
                newClass = orgClass + this.errorClassWithComma;
            } else {
                newClass = this.errorClass;
            }
            arg1.put(ATTRIBUTE_CLASS, newClass);
        } else {
            boolean existsOrgClass = null != orgClass && !orgClass.isEmpty() && !this.errorClass.equals(orgClass);
            if (existsOrgClass) {
                arg1.put(ATTRIBUTE_CLASS, orgClass.replaceAll(this.errorClassWithComma, ""));
            } else {
                arg1.remove(ATTRIBUTE_CLASS);
            }
        }
    }
}