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Spring Framework example source code file (TagIdGenerator.java)
The Spring Framework TagIdGenerator.java source code/* * Copyright 2002-2008 the original author or authors. * * 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.springframework.web.servlet.tags.form; import javax.servlet.jsp.PageContext; /** * Utility class for generating '<code>id' attributes values for JSP tags. Given the * name of a tag (the data bound path in most cases) returns a unique ID for that name within * the current {@link PageContext}. Each request for an ID for a given name will append an * ever increasing counter to the name itself. For instance, given the name '<code>person.name', * the first request will give '<code>person.name1' and the second will give * '<code>person.name2'. This supports the common use case where a set of radio or check buttons * are generated for the same data field, with each button being a distinct tag instance. * * @author Rob Harrop * @author Juergen Hoeller * @since 2.0 */ abstract class TagIdGenerator { /** * The prefix for all {@link PageContext} attributes created by this tag. */ private static final String PAGE_CONTEXT_ATTRIBUTE_PREFIX = TagIdGenerator.class.getName() + "."; /** * Get the next unique ID (within the given {@link PageContext}) for the supplied name. */ public static String nextId(String name, PageContext pageContext) { String attributeName = PAGE_CONTEXT_ATTRIBUTE_PREFIX + name; Integer currentCount = (Integer) pageContext.getAttribute(attributeName); currentCount = (currentCount != null ? new Integer(currentCount.intValue() + 1) : new Integer(1)); pageContext.setAttribute(attributeName, currentCount); return (name + currentCount.intValue()); } } Other Spring Framework examples (source code examples)Here is a short list of links related to this Spring Framework TagIdGenerator.java source code file: |
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