Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.wicketstuff.misc.behaviors; import org.apache.wicket.Component; import org.apache.wicket.behavior.SimpleAttributeModifier; import org.apache.wicket.markup.ComponentTag; import org.apache.wicket.util.string.Strings; /** * * @author dwayne */ @SuppressWarnings("serial") public class SimpleAttributeAppender extends SimpleAttributeModifier { private CharSequence separator_; public SimpleAttributeAppender(String attribute, CharSequence value, CharSequence separator) { super(attribute, value); separator_ = separator; } /** * @see org.apache.wicket.behavior.AbstractBehavior#onComponentTag(org.apache.wicket.Component, * org.apache.wicket.markup.ComponentTag) */ @Override public void onComponentTag(final Component component, final ComponentTag tag) { if (isEnabled(component) && !Strings.isEmpty(getValue())) { CharSequence newValue = tag.getAttributes().getString(getAttribute()); if (Strings.isEmpty(newValue)) { newValue = getValue(); } else { newValue = new StringBuilder(getValue()).append(separator_).append(newValue); } tag.getAttributes().put(getAttribute(), newValue); } } }