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Tomcat example source code file (SmapGenerator.java)

This example Tomcat source code file (SmapGenerator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

arraylist, c, java, jsp, jsp, list, smapgenerator, smapgenerator, smapstratum, smapstratum, string, string, stringbuffer, tier2, util

The Tomcat SmapGenerator.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.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 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, 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 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, 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);
    }
}

Other Tomcat examples (source code examples)

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