com.google.gwt.dev.util.msg.Message Maven / Gradle / Ivy
/*
* Copyright 2006 Google Inc.
*
* Licensed 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 com.google.gwt.dev.util.msg;
import com.google.gwt.core.ext.TreeLogger;
/**
* Fast way to produce messages for the logger. Use $N to specify the replacement argument.
*
* Caveats:
*
* - N must be a single digit (you shouldn't need more than 10 args, right?)
*
- '$' cannot be escaped
*
- each arg can only appear once
*
*/
public abstract class Message {
private static final Formatter FMT_TOSTRING = new FormatterToString();
private static final Formatter FMT_CLASS = new FormatterForClass();
private static final Formatter FMT_INTEGER = new FormatterForInteger();
private static final Formatter FMT_STRING = new FormatterForString();
protected final TreeLogger.Type type;
protected final char[][] fmtParts;
protected final int[] argIndices;
/**
* Creates a lazily-formatted message.
*/
protected Message(TreeLogger.Type type, String fmt, int args) {
assert (type != null);
assert (fmt != null);
assert (args >= 0);
this.type = type;
fmtParts = new char[args + 1][];
argIndices = new int[args];
int from = 0;
for (int i = 0; i < args; ++i) {
int to = fmt.indexOf('$', from);
if (to != -1 && to < fmt.length() - 1) {
char charDigit = fmt.charAt(to + 1);
if (Character.isDigit(charDigit)) {
int digit = Character.digit(charDigit, 10);
fmtParts[i] = fmt.substring(from, to).toCharArray();
argIndices[i] = digit;
from = to + 2;
continue;
}
}
throw new IllegalArgumentException("Expected arg $" + i);
}
fmtParts[args] = fmt.substring(from).toCharArray();
}
/**
* @param c a Class
* @return a suitable Formatter
*/
protected final Formatter getFormatter(Class c) {
return FMT_CLASS;
}
/**
* @param i an Integer
* @return a suitable Formatter
*/
protected final Formatter getFormatter(Integer i) {
return FMT_INTEGER;
}
/**
* @param s a String
* @return a suitable Formatter
*/
protected final Formatter getFormatter(String s) {
return FMT_STRING;
}
protected final Formatter getToStringFormatter() {
return FMT_TOSTRING;
}
protected TreeLogger branch(TreeLogger logger, Throwable caught) {
return branch(logger, toArray(), new Formatter[0], caught);
}
protected TreeLogger branch(TreeLogger logger, Object arg, Formatter fmt, Throwable caught) {
return branch(logger, toArray(arg), toArray(fmt), caught);
}
protected TreeLogger branch(TreeLogger logger, Object[] args, Object[] fmts,
Throwable caught) {
return logger.branch(type, compose(args, fmts), caught);
}
protected String compose(Object[] args, Object[] fmts) {
// Format the objects.
assert args.length == fmts.length;
String[] formattedArgs = new String[args.length];
for (int i = 0; i < argIndices.length; i++) {
int referredIndex = argIndices[i];
Object referredArg = args[referredIndex];
Formatter formatter = (Formatter) fmts[referredIndex];
formattedArgs[i] = (referredArg != null ? formatter.format(referredArg) : "null");
}
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < formattedArgs.length; i++) {
stringBuilder.append(fmtParts[i]);
stringBuilder.append(formattedArgs[i]);
}
// final literal
stringBuilder.append(fmtParts[fmtParts.length - 1]);
return stringBuilder.toString();
}
protected void log(TreeLogger logger, Throwable caught) {
log(logger, toArray(), toArray(), caught);
}
protected void log(TreeLogger logger, Object arg, Formatter fmt, Throwable caught) {
log(logger, toArray(arg), toArray(fmt), caught);
}
protected void log(TreeLogger logger, Object arg1, Object arg2, Formatter fmt1, Formatter fmt2,
Throwable caught) {
log(logger, toArray(arg1, arg2), toArray(fmt1, fmt2), caught);
}
protected void log(TreeLogger logger, Object arg1, Object arg2, Object arg3, Formatter fmt1,
Formatter fmt2, Formatter fmt3, Throwable caught) {
log(logger, toArray(arg1, arg2, arg3), toArray(fmt1, fmt2, fmt3), caught);
}
protected void log(TreeLogger logger, Object arg1, Object arg2, Object arg3, Object arg4,
Formatter fmt1, Formatter fmt2, Formatter fmt3, Formatter fmt4, Throwable caught) {
log(logger, toArray(arg1, arg2, arg3, arg4), toArray(fmt1, fmt2, fmt3, fmt4), caught);
}
protected void log(TreeLogger logger, Object[] args, Object[] fmts, Throwable caught) {
if (logger.isLoggable(type)) {
logger.log(type, compose(args, fmts), caught);
}
}
private Object[] toArray(Object... pars) {
return pars;
}
}