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:
056: package com.sun.portal.providers.jsp.jasper3.jasper.compiler;
057:
058: import java.util.Stack;
059: import java.util.Hashtable;
060:
061: import javax.servlet.jsp.tagext.VariableInfo;
062:
063: /**
064: * Common stuff for use with TagBegin and TagEndGenerators.
065: *
066: * @author Anil K. Vijendran
067: * @author Hans Bergsten [hans@gefionsoftware.com] (changed all statics to
068: * regular instance vars and methods to avoid corrupt state and
069: * multi-threading issues)
070: */
071: abstract class TagGeneratorBase extends GeneratorBase {
072: private Stack tagHandlerStack;
073: private Hashtable tagVarNumbers;
074:
075: class TagVariableData {
076: String tagHandlerInstanceName;
077: String tagEvalVarName;
078:
079: TagVariableData(String tagHandlerInstanceName,
080: String tagEvalVarName) {
081: this .tagHandlerInstanceName = tagHandlerInstanceName;
082: this .tagEvalVarName = tagEvalVarName;
083: }
084: }
085:
086: /**
087: * Sets the tag handler nesting stack for the current page.
088: * Called when an instance is created.
089: */
090: protected void setTagHandlerStack(Stack tagHandlerStack) {
091: this .tagHandlerStack = tagHandlerStack;
092: }
093:
094: /**
095: * Sets the tag variable number repository for the current page.
096: * Called when an instance is created.
097: */
098: protected void setTagVarNumbers(Hashtable tagVarNumbers) {
099: this .tagVarNumbers = tagVarNumbers;
100: }
101:
102: protected void tagBegin(TagVariableData tvd) {
103: tagHandlerStack.push(tvd);
104: }
105:
106: protected TagVariableData tagEnd() {
107: return (TagVariableData) tagHandlerStack.pop();
108: }
109:
110: protected TagVariableData topTag() {
111: if (tagHandlerStack.empty())
112: return null;
113: return (TagVariableData) tagHandlerStack.peek();
114: }
115:
116: protected String getTagVarName(String prefix, String shortTagName) {
117: // Fix: Can probably remove the synchronization now when no vars or method is static
118: synchronized (tagVarNumbers) {
119: String tag = prefix + ":" + shortTagName;
120: String varName = prefix + "_" + shortTagName + "_";
121: if (tagVarNumbers.get(tag) != null) {
122: Integer i = (Integer) tagVarNumbers.get(tag);
123: varName = varName + i.intValue();
124: tagVarNumbers.put(tag, new Integer(i.intValue() + 1));
125: return varName;
126: } else {
127: tagVarNumbers.put(tag, new Integer(1));
128: return varName + "0";
129: }
130: }
131: }
132:
133: protected void declareVariables(ServletWriter writer,
134: VariableInfo[] vi, boolean declare, boolean update,
135: int scope) {
136: if (vi != null)
137: for (int i = 0; i < vi.length; i++)
138: if (vi[i].getScope() == scope) {
139: if (vi[i].getDeclare() == true && declare == true)
140: writer.println(vi[i].getClassName() + " "
141: + vi[i].getVarName() + " = null;");
142: if (update == true)
143: writer
144: .println(vi[i].getVarName()
145: + " = ("
146: + vi[i].getClassName()
147: + ") pageContext.findAttribute("
148: + writer.quoteString(vi[i]
149: .getVarName()) + ");");
150: }
151: }
152: }
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