Tomcat example source code file (Mark.java)

This example Tomcat source code file (Mark.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

includestate, includestate, jspcompilationcontext, jspreader, malformedurlexception, mark, mark, net, network, stack, stack, string, string, url, util

The Tomcat Mark.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.Stack;
import java.net.URL;
import java.net.MalformedURLException;
import org.apache.jasper.JspCompilationContext;

/**
 * Mark represents a point in the JSP input. 
 *
 * @author Anil K. Vijendran
 */
final class Mark {

    // position within current stream
    int cursor, line, col;

    // directory of file for current stream
    String baseDir;

    // current stream
    char[] stream = null;

    // fileid of current stream
    private int fileId;

    // name of the current file
    private String fileName;

    /*
     * stack of stream and stream state of streams that have included
     * current stream
     */
    private Stack includeStack = null;

    // encoding of current file
    private String encoding = null;

    // reader that owns this mark (so we can look up fileid's)
    private JspReader reader;

    private JspCompilationContext ctxt;

    /**
     * Constructor
     *
     * @param reader JspReader this mark belongs to
     * @param inStream current stream for this mark
     * @param fileId id of requested jsp file
     * @param name JSP file name
     * @param inBaseDir base directory of requested jsp file
     * @param inEncoding encoding of current file
     */
    Mark(JspReader reader, char[] inStream, int fileId, String name,
         String inBaseDir, String inEncoding) {

        this.reader = reader;
        this.ctxt = reader.getJspCompilationContext();
        this.stream = inStream;
        this.cursor = 0;
        this.line = 1;
        this.col = 1;
        this.fileId = fileId;
        this.fileName = name;
        this.baseDir = inBaseDir;
        this.encoding = inEncoding;
        this.includeStack = new Stack();
    }


    /**
     * Constructor
     */
    Mark(Mark other) {

        this.reader = other.reader;
        this.ctxt = other.reader.getJspCompilationContext();
        this.stream = other.stream;
        this.fileId = other.fileId;
        this.fileName = other.fileName;
        this.cursor = other.cursor;
        this.line = other.line;
        this.col = other.col;
        this.baseDir = other.baseDir;
        this.encoding = other.encoding;

        // clone includeStack without cloning contents
        includeStack = new Stack();
        for ( int i=0; i < other.includeStack.size(); i++ ) {
            includeStack.addElement( other.includeStack.elementAt(i) );
        }
    }


    /**
     * Constructor
     */    
    Mark(JspCompilationContext ctxt, String filename, int line, int col) {

        this.reader = null;
        this.ctxt = ctxt;
        this.stream = null;
        this.cursor = 0;
        this.line = line;
        this.col = col;
        this.fileId = -1;
        this.fileName = filename;
        this.baseDir = "le-basedir";
        this.encoding = "le-endocing";
        this.includeStack = null;
    }


    /**
     * Sets this mark's state to a new stream.
     * It will store the current stream in it's includeStack.
     *
     * @param inStream new stream for mark
     * @param inFileId id of new file from which stream comes from
     * @param inBaseDir directory of file
     * @param inEncoding encoding of new file
     */
    public void pushStream(char[] inStream, int inFileId, String name,
                           String inBaseDir, String inEncoding) 
    {
        // store current state in stack
        includeStack.push(new IncludeState(cursor, line, col, fileId,
                                           fileName, baseDir, 
					   encoding, stream) );

        // set new variables
        cursor = 0;
        line = 1;
        col = 1;
        fileId = inFileId;
        fileName = name;
        baseDir = inBaseDir;
        encoding = inEncoding;
        stream = inStream;
    }


    /**
     * Restores this mark's state to a previously stored stream.
     * @return The previous Mark instance when the stream was pushed, or null
     * if there is no previous stream
     */
    public Mark popStream() {
        // make sure we have something to pop
        if ( includeStack.size() <= 0 ) {
            return null;
        }

        // get previous state in stack
        IncludeState state = (IncludeState) includeStack.pop( );

        // set new variables
        cursor = state.cursor;
        line = state.line;
        col = state.col;
        fileId = state.fileId;
        fileName = state.fileName;
        baseDir = state.baseDir;
        stream = state.stream;
        return this;
    }


    // -------------------- Locator interface --------------------

    public int getLineNumber() {
        return line;
    }

    public int getColumnNumber() {
        return col;
    }

    public String getSystemId() {
        return getFile();
    }

    public String getPublicId() {
        return null;
    }

    public String toString() {
	return getFile()+"("+line+","+col+")";
    }

    public String getFile() {
        return this.fileName;
    }

    /**
     * Gets the URL of the resource with which this Mark is associated
     *
     * @return URL of the resource with which this Mark is associated
     *
     * @exception MalformedURLException if the resource pathname is incorrect
     */
    public URL getURL() throws MalformedURLException {
        return ctxt.getResource(getFile());
    }

    public String toShortString() {
        return "("+line+","+col+")";
    }

    public boolean equals(Object other) {
	if (other instanceof Mark) {
	    Mark m = (Mark) other;
	    return this.reader == m.reader && this.fileId == m.fileId 
		&& this.cursor == m.cursor && this.line == m.line 
		&& this.col == m.col;
	} 
	return false;
    }

    /**
     * @return true if this Mark is greather than the <code>other
     * Mark, false otherwise.
     */
    public boolean isGreater(Mark other) {

        boolean greater = false;

        if (this.line > other.line) {
            greater = true;
        } else if (this.line == other.line && this.col > other.col) {
            greater = true;
        }

        return greater;
    }

    /**
     * Keep track of parser before parsing an included file.
     * This class keeps track of the parser before we switch to parsing an
     * included file. In other words, it's the parser's continuation to be
     * reinstalled after the included file parsing is done.
     */
    class IncludeState {
        int cursor, line, col;
        int fileId;
        String fileName;
        String baseDir;
        String encoding;
        char[] stream = null;

        IncludeState(int inCursor, int inLine, int inCol, int inFileId, 
                     String name, String inBaseDir, String inEncoding,
                     char[] inStream) {
            cursor = inCursor;
            line = inLine;
            col = inCol;
            fileId = inFileId;
            fileName = name;
            baseDir = inBaseDir;
            encoding = inEncoding;
            stream = inStream;
        }
    }

}