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;
import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;
/**
* 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_FILE = new FormatterForFile();
private static final Formatter FMT_URL = new FormatterForURL();
private static final Formatter FMT_INTEGER = new FormatterForInteger();
private static final Formatter FMT_LONG = new FormatterForLong();
private static final Formatter FMT_METHOD = new FormatterForMethod();
private static final Formatter FMT_STRING = new FormatterForString();
private static final Formatter FMT_STRING_ARRAY = new FormatterForStringArray();
protected final TreeLogger.Type type;
protected final char[][] fmtParts;
protected final int[] argIndices;
protected final int minChars;
/**
* 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) {
if (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();
int minNumChars = 0;
for (int i = 0, n = fmtParts.length; i < n; ++i) {
minNumChars += fmtParts[i].length;
}
this.minChars = minNumChars;
}
/**
* @param c a Class
* @return a suitable Formatter
*/
protected final Formatter getFormatter(Class c) {
return FMT_CLASS;
}
/**
* @param f a File
* @return a suitable Formatter
*/
protected final Formatter getFormatter(File f) {
return FMT_FILE;
}
/**
* @param i an Integer
* @return a suitable Formatter
*/
protected final Formatter getFormatter(Integer i) {
return FMT_INTEGER;
}
/**
* @param l a Long
* @return a suitable Formatter
*/
protected Formatter getFormatter(Long l) {
return FMT_LONG;
}
/**
* @param m a Method
* @return a suitable Formatter
*/
protected final Formatter getFormatter(Method m) {
return FMT_METHOD;
}
/**
* @param s a String
* @return a suitable Formatter
*/
protected final Formatter getFormatter(String s) {
return FMT_STRING;
}
/**
* @param sa a String array
* @return a suitable Formatter
*/
protected final Formatter getFormatter(String[] sa) {
return FMT_STRING_ARRAY;
}
/**
* @param u a URL
* @return a suitable Formatter
*/
protected final Formatter getFormatter(URL u) {
return FMT_URL;
}
protected final Formatter getToStringFormatter() {
return FMT_TOSTRING;
}
}