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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package net.java.games.gluegen;
import java.util.*;
import java.io.*;
public abstract class FunctionEmitter
{
public static final EmissionModifier STATIC = new EmissionModifier("static");
private HashSet modifiers = new HashSet(4);
private CommentEmitter commentEmitter = null;
private PrintWriter defaultOutput;
/**
* Constructs the FunctionEmitter with a CommentEmitter that emits nothing.
*/
public FunctionEmitter(PrintWriter defaultOutput)
{
assert(defaultOutput != null);
this.defaultOutput = defaultOutput;
}
public PrintWriter getDefaultOutput() { return defaultOutput; }
public void addModifiers(Iterator/*<EmissionModifier>*/ mi)
{
while (mi.hasNext())
{
modifiers.add((EmissionModifier) mi.next());
}
}
public void addModifier(EmissionModifier m) { modifiers.add(m); }
public boolean removeModifier(EmissionModifier m) { return modifiers.remove(m); }
public void clearModifiers() { modifiers.clear(); }
public boolean hasModifier(EmissionModifier m) { return modifiers.contains(m); }
public Iterator getModifiers() { return modifiers.iterator(); }
public abstract String getName();
/**
* Emit the function to the specified output (instead of the default
* output).
*/
public void emit(PrintWriter output)
{
emitDocComment(output);
//output.println(" // Emitter: " + getClass().getName());
emitSignature(output);
emitBody(output);
}
/**
* Emit the function to the default output (the output that was passed to
* the constructor)
*/
public final void emit()
{
emit(getDefaultOutput());
}
/** Returns, as a String, whatever {@link emit()} would output. */
public String toString()
{
StringWriter sw = new StringWriter(500);
PrintWriter w = new PrintWriter(sw);
emit(w);
return sw.toString();
}
/**
* Set the object that will emit the comment for this function. If the
* parameter is null, no comment will be emitted.
*/
public void setCommentEmitter(CommentEmitter cEmitter)
{
commentEmitter = cEmitter;
}
/**
* Get the comment emitter for this FunctionEmitter. The return value may be
* null, in which case no comment emitter has been set.
*/
public CommentEmitter getCommentEmitter() { return commentEmitter; }
protected void emitDocComment(PrintWriter writer)
{
if (commentEmitter != null)
{
writer.print(getBaseIndentString()); //indent
writer.print(getCommentStartString());
commentEmitter.emit(this, writer);
writer.print(getBaseIndentString()); //indent
writer.println(getCommentEndString());
}
}
protected void emitSignature(PrintWriter writer)
{
writer.print(getBaseIndentString()); // indent method
int numEmitted = emitModifiers(writer);
if (numEmitted > 0)
{
writer.print(" ");
}
emitReturnType(writer);
writer.print(" ");
emitName(writer);
writer.print("(");
emitArguments(writer);
writer.print(")");
}
protected int emitModifiers(PrintWriter writer)
{
PrintWriter w = getDefaultOutput();
int numEmitted = 0;
for (Iterator it = getModifiers(); it.hasNext(); )
{
writer.print(it.next());
++numEmitted;
if (it.hasNext())
{
writer.print(" ");
}
}
return numEmitted;
}
protected String getBaseIndentString() { return ""; }
protected String getCommentStartString() { return "/* "; }
protected String getCommentEndString() { return " */"; }
protected abstract void emitReturnType(PrintWriter writer);
protected abstract void emitName(PrintWriter writer);
/** Returns the number of arguments emitted. */
protected abstract int emitArguments(PrintWriter writer);
protected abstract void emitBody(PrintWriter writer);
public static class EmissionModifier
{
public final String toString() { return emittedForm; }
private String emittedForm;
protected EmissionModifier(String emittedForm) { this.emittedForm = emittedForm; }
}
}
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