org.apache.jasper.compiler.ServletWriter Maven / Gradle / Ivy
/*
* 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.io.PrintWriter;
/**
* This is what is used to generate servlets.
*
* @author Anil K. Vijendran
* @author Kin-man Chung
*/
public class ServletWriter implements AutoCloseable {
private static final int TAB_WIDTH = 2;
private static final String SPACES = " ";
/**
* Current indent level.
*/
private int indent = 0;
private int virtual_indent = 0;
/**
* The sink writer.
*/
private final PrintWriter writer;
/**
* Servlet line numbers start from 1.
*/
private int javaLine = 1;
public ServletWriter(PrintWriter writer) {
this.writer = writer;
}
@Override
public void close() {
writer.close();
}
// -------------------- Access information --------------------
public int getJavaLine() {
return javaLine;
}
// -------------------- Formatting --------------------
public void pushIndent() {
virtual_indent += TAB_WIDTH;
if (virtual_indent >= 0 && virtual_indent <= SPACES.length()) {
indent = virtual_indent;
}
}
public void popIndent() {
virtual_indent -= TAB_WIDTH;
if (virtual_indent >= 0 && virtual_indent <= SPACES.length()) {
indent = virtual_indent;
}
}
/**
* Prints the given string followed by '\n'
* @param s The string
*/
public void println(String s) {
javaLine++;
writer.println(s);
}
/**
* Prints a '\n'
*/
public void println() {
javaLine++;
writer.println("");
}
/**
* Prints the current indentation
*/
public void printin() {
writer.print(SPACES.substring(0, indent));
}
/**
* Prints the current indentation, followed by the given string
* @param s The string
*/
public void printin(String s) {
writer.print(SPACES.substring(0, indent));
writer.print(s);
}
/**
* Prints the current indentation, and then the string, and a '\n'.
* @param s The string
*/
public void printil(String s) {
javaLine++;
writer.print(SPACES.substring(0, indent));
writer.println(s);
}
/**
* Prints the given char.
*
* Use println() to print a '\n'.
* @param c The char
*/
public void print(char c) {
writer.print(c);
}
/**
* Prints the given int.
* @param i The int
*/
public void print(int i) {
writer.print(i);
}
/**
* Prints the given string.
*
* The string must not contain any '\n', otherwise the line count will be
* off.
* @param s The string
*/
public void print(String s) {
writer.print(s);
}
/**
* Prints the given string.
*
* If the string spans multiple lines, the line count will be adjusted
* accordingly.
* @param s The string
*/
public void printMultiLn(String s) {
int index = 0;
// look for hidden newlines inside strings
while ((index=s.indexOf('\n',index)) > -1 ) {
javaLine++;
index++;
}
writer.print(s);
}
}