001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1999 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution, if
020: * any, must include the following acknowlegement:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowlegement may appear in the software itself,
024: * if and wherever such third-party acknowlegements normally appear.
025: *
026: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027: * Foundation" must not be used to endorse or promote products derived
028: * from this software without prior written permission. For written
029: * permission, please contact apache@apache.org.
030: *
031: * 5. Products derived from this software may not be called "Apache"
032: * nor may "Apache" appear in their names without prior written
033: * permission of the Apache Group.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: *
049: * This software consists of voluntary contributions made by many
050: * individuals on behalf of the Apache Software Foundation. For more
051: * information on the Apache Software Foundation, please see
052: * <http://www.apache.org/>.
053: *
054: */
055: package com.sun.portal.providers.jsp.jasper3.jasper.compiler;
056:
057: import java.util.Hashtable;
058:
059: import java.lang.reflect.Method;
060:
061: import java.beans.BeanInfo;
062: import java.beans.Introspector;
063: import java.beans.PropertyDescriptor;
064: import java.beans.IntrospectionException;
065:
066: import com.sun.portal.providers.jsp.jasper3.jasper.JasperException;
067: import com.sun.portal.providers.jsp.jasper3.jasper.Constants;
068:
069: /**
070: * A simple cache to hold results of one-time evaluation for a custom
071: * tag.
072: *
073: * @author Anil K. Vijendran (akv@eng.sun.com)
074: */
075: public class TagCache {
076: String shortTagName;
077: Hashtable methodMaps;
078: BeanInfo tagClassInfo;
079: Class tagHandlerClass;
080:
081: TagCache(String shortTagName) {
082: this .shortTagName = shortTagName;
083: this .methodMaps = new Hashtable();
084: }
085:
086: private void addSetterMethod(String attrName, Method m) {
087: methodMaps.put(attrName, m);
088: }
089:
090: Method getSetterMethod(String attrName) {
091: return (Method) methodMaps.get(attrName);
092: }
093:
094: void setTagHandlerClass(Class tagHandlerClass)
095: throws JasperException {
096: try {
097: this .tagClassInfo = Introspector
098: .getBeanInfo(tagHandlerClass);
099: this .tagHandlerClass = tagHandlerClass;
100: PropertyDescriptor[] pd = tagClassInfo
101: .getPropertyDescriptors();
102: for (int i = 0; i < pd.length; i++) {
103: /* FIXME: why is the check for null below needed?? -akv */
104: /*
105: FIXME: should probably be checking for things like
106: pageContext, bodyContent, and parent here -akv
107: */
108: if (pd[i].getWriteMethod() != null)
109: addSetterMethod(pd[i].getName(), pd[i]
110: .getWriteMethod());
111: }
112: } catch (IntrospectionException ex) {
113: throw new JasperException(Constants.getString(
114: "jsp.error.unable.to_introspect",
115: new Object[] { tagHandlerClass.getName(),
116: ex.getMessage() }));
117: }
118: }
119:
120: Class getTagHandlerClass() {
121: return tagHandlerClass;
122: }
123:
124: BeanInfo getTagClassInfo() {
125: return tagClassInfo;
126: }
127: }
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