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Jetty example source code file (TagData.java)
The Jetty TagData.java source code/** * * Copyright 2003-2004 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. */ // // This source code implements specifications defined by the Java // Community Process. In order to remain compliant with the specification // DO NOT add / change / or delete method signatures! // package javax.servlet.jsp.tagext; import java.util.Hashtable; /** * The (translation-time only) attribute/value information for a tag instance. * * <p> * TagData is only used as an argument to the isValid, validate, and * getVariableInfo methods of TagExtraInfo, which are invoked at * translation time. */ public class TagData implements Cloneable { /** * Distinguished value for an attribute to indicate its value * is a request-time expression (which is not yet available because * TagData instances are used at translation-time). */ public static final Object REQUEST_TIME_VALUE = new Object(); /** * Constructor for TagData. * * <p> * A typical constructor may be * <pre> * static final Object[][] att = {{"connection", "conn0"}, {"id", "query0"}}; * static final TagData td = new TagData(att); * </pre> * * All values must be Strings except for those holding the * distinguished object REQUEST_TIME_VALUE. * @param atts the static attribute and values. May be null. */ public TagData(Object[] atts[]) { if (atts == null) { attributes = new Hashtable(); } else { attributes = new Hashtable(atts.length); } if (atts != null) { for (int i = 0; i < atts.length; i++) { attributes.put(atts[i][0], atts[i][1]); } } } /** * Constructor for a TagData. * * If you already have the attributes in a hashtable, use this * constructor. * * @param attrs A hashtable to get the values from. */ public TagData(Hashtable attrs) { this.attributes = attrs; } /** * The value of the tag's id attribute. * * @return the value of the tag's id attribute, or null if no such * attribute was specified. */ public String getId() { return getAttributeString(TagAttributeInfo.ID); } /** * The value of the attribute. * If a static value is specified for an attribute that accepts a * request-time attribute expression then that static value is returned, * even if the value is provided in the body of a <jsp:attribute> action. * The distinguished object REQUEST_TIME_VALUE is only returned if * the value is specified as a request-time attribute expression * or via the <jsp:attribute> action with a body that contains * dynamic _content (scriptlets, scripting expressions, EL expressions, * standard actions, or custom actions). Returns null if the attribute * is not set. * * @param attName the name of the attribute * @return the attribute's value */ public Object getAttribute(String attName) { return attributes.get(attName); } /** * Set the value of an attribute. * * @param attName the name of the attribute * @param value the value. */ public void setAttribute(String attName, Object value) { attributes.put(attName, value); } /** * Get the value for a given attribute. * * @param attName the name of the attribute * @return the attribute value string * @throws ClassCastException if attribute value is not a String */ public String getAttributeString(String attName) { Object o = attributes.get(attName); if (o == null) { return null; } else { return (String) o; } } /** * Enumerates the attributes. * *@return An enumeration of the attributes in a TagData */ public java.util.Enumeration getAttributes() { return attributes.keys(); }; // private data private Hashtable attributes; // the tagname/value map } Other Jetty examples (source code examples)Here is a short list of links related to this Jetty TagData.java source code file: |
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