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/***
* WriterStack.java 1.0
* this is a stack for Writer.
* wrapper class of java.util.Stack
*
* @see java.io.Writer
* @see java.util.Stack
* @version last updated: 06/11/97
* @author Michiaki Tatsubori
***/
/* package */
package io.devnulllabs.openjava.tools;
/* import */
import java.io.BufferedWriter;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.EmptyStackException;
import java.util.Stack;
/**
* Wrapper class of class Stack to specialize into Writer.
**/
public class WriterStack
{
private Stack stack = null;
private static PrintWriter defaultWriter
= new PrintWriter(
new BufferedWriter(
new OutputStreamWriter( System.out ) ) );
/**
* Constructs this stack with an element(standard output).
**/
public WriterStack() {
stack = new Stack();
stack.push( defaultWriter );
}
/**
* Constructs this stack with the specified print writer.
**/
public WriterStack( PrintWriter writer ) {
stack = new Stack();
stack.push( writer );
}
/**
* Constructs this stack with the specified writer.
**/
public WriterStack( Writer writer ) {
stack = new Stack();
stack.push( new PrintWriter( writer ) );
}
/**
* Constructs this stack with the specified output stream.
**/
public WriterStack( OutputStream out ) {
stack = new Stack();
stack.push( new PrintWriter( new OutputStreamWriter( out ) ) );
}
/**
* Looks at the print writer at the top of this stack
* without removing it from the stack.
*
* @return the print writer at the top of this stack.
**/
public PrintWriter peek() {
try{
return (PrintWriter)stack.peek();
}catch( EmptyStackException ex ){
System.err.println( ex );
return defaultWriter;
}
}
/**
* Removes the print writer at the top of this stack and
* returns that print writer as the value of this function.
*
* @return The object at the top of this stack.
**/
public PrintWriter pop() {
try{
return (PrintWriter)stack.pop();
}catch( EmptyStackException ex ){
System.err.println( ex );
return defaultWriter;
}
}
/**
* Pushes a print writer onto the top of this stack.
*
* @param writer the print writer to be pushed onto this stack.
* @return the item argument.
**/
public void push( PrintWriter writer ) {
stack.push( writer );
}
/**
* Pushes a print writer onto the top of this stack.
*
* @param writer the writer to be pushed onto this stack.
* @return the item argument.
**/
public void push( Writer writer ) {
stack.push( new PrintWriter( writer ) );
}
/**
* Pushes a print writer from the specified print stream
* onto the top of this stack.
*
* @param ostream the output stream to be pushed onto this stack.
* @return the item argument.
**/
public void push( OutputStream ostream ) {
stack.push( new PrintWriter( new OutputStreamWriter( ostream ) ) );
}
/**
* Tests if this stack is empty.
*
* @return true if this stack is empty; false otherwise.
**/
public boolean empty() {
return stack.empty();
}
}
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