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package org.apache.jasper.compiler;
import java.util.List;
import java.util.ArrayList;
/**
* Represents a source map (SMAP), which serves to associate lines
* of the input JSP file(s) to lines in the generated servlet in the
* final .class file, according to the JSR-045 spec.
*
* @author Shawn Bayern
*/
public class SmapGenerator {
//*********************************************************************
// Overview
/*
* The SMAP syntax is reasonably straightforward. The purpose of this
* class is currently twofold:
* - to provide a simple but low-level Java interface to build
* a logical SMAP
* - to serialize this logical SMAP for eventual inclusion directly
* into a .class file.
*/
//*********************************************************************
// Private state
private String outputFileName;
private String defaultStratum = "Java";
private List strata = new ArrayList();
private List embedded = new ArrayList();
private boolean doEmbedded = true;
//*********************************************************************
// Methods for adding mapping data
/**
* Sets the filename (without path information) for the generated
* source file. E.g., "foo$jsp.java".
*/
public synchronized void setOutputFileName(String x) {
outputFileName = x;
}
/**
* Adds the given SmapStratum object, representing a Stratum with
* logically associated FileSection and LineSection blocks, to
* the current SmapGenerator. If <tt>default</tt> is true, this
* stratum is made the default stratum, overriding any previously
* set default.
*
* @param stratum the SmapStratum object to add
* @param defaultStratum if <tt>true</tt>, this SmapStratum is considered
* to represent the default SMAP stratum unless
* overwritten
*/
public synchronized void addStratum(SmapStratum stratum,
boolean defaultStratum) {
strata.add(stratum);
if (defaultStratum)
this.defaultStratum = stratum.getStratumName();
}
/**
* Adds the given string as an embedded SMAP with the given stratum name.
*
* @param smap the SMAP to embed
* @param stratumName the name of the stratum output by the compilation
* that produced the <tt>smap</tt> to be embedded
*/
public synchronized void addSmap(String smap, String stratumName) {
embedded.add("*O " + stratumName + "\n"
+ smap
+ "*C " + stratumName + "\n");
}
/**
* Instructs the SmapGenerator whether to actually print any embedded
* SMAPs or not. Intended for situations without an SMAP resolver.
*
* @param status If <tt>false</tt>, ignore any embedded SMAPs.
*/
public void setDoEmbedded(boolean status) {
doEmbedded = status;
}
//*********************************************************************
// Methods for serializing the logical SMAP
public synchronized String getString() {
// check state and initialize buffer
if (outputFileName == null)
throw new IllegalStateException();
StringBuffer out = new StringBuffer();
// start the SMAP
out.append("SMAP\n");
out.append(outputFileName + '\n');
out.append(defaultStratum + '\n');
// include embedded SMAPs
if (doEmbedded) {
int nEmbedded = embedded.size();
for (int i = 0; i < nEmbedded; i++) {
out.append(embedded.get(i));
}
}
// print our StratumSections, FileSections, and LineSections
int nStrata = strata.size();
for (int i = 0; i < nStrata; i++) {
SmapStratum s = (SmapStratum) strata.get(i);
out.append(s.getString());
}
// end the SMAP
out.append("*E\n");
return out.toString();
}
public String toString() { return getString(); }
//*********************************************************************
// For testing (and as an example of use)...
public static void main(String args[]) {
SmapGenerator g = new SmapGenerator();
g.setOutputFileName("foo.java");
SmapStratum s = new SmapStratum("JSP");
s.addFile("foo.jsp");
s.addFile("bar.jsp", "/foo/foo/bar.jsp");
s.addLineData(1, "foo.jsp", 1, 1, 1);
s.addLineData(2, "foo.jsp", 1, 6, 1);
s.addLineData(3, "foo.jsp", 2, 10, 5);
s.addLineData(20, "bar.jsp", 1, 30, 1);
g.addStratum(s, true);
System.out.print(g);
System.out.println("---");
SmapGenerator embedded = new SmapGenerator();
embedded.setOutputFileName("blargh.tier2");
s = new SmapStratum("Tier2");
s.addFile("1.tier2");
s.addLineData(1, "1.tier2", 1, 1, 1);
embedded.addStratum(s, true);
g.addSmap(embedded.toString(), "JSP");
System.out.println(g);
}
}
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