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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.logserver.net.control;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* This class is used to represent the state of each log level
* in a set of states.
*
* @author Bjorn Borud
*/
public class Levels implements Cloneable {
private final Map<String, State> levelsMap = new LinkedHashMap<String, State>(10);
/**
* The constructor initializes the Levels object to its default
* state.
*/
public Levels () {
levelsMap.put("event", State.FORWARD);
levelsMap.put("fatal", State.FORWARD);
levelsMap.put("error", State.FORWARD);
levelsMap.put("warning", State.FORWARD);
levelsMap.put("info", State.FORWARD);
levelsMap.put("config", State.FORWARD);
levelsMap.put("debug", State.NOFORWARD);
levelsMap.put("spam", State.NOFORWARD);
}
/**
* Parse a levels representation and return a Levels object
* representing the levels.
*
* @param levels A string representation of the levels
* @return new instance of Levels, possibly having no
* real values if none could be found in the
* <code>levels</code> parameter.
*
*/
public static Levels parse (String levels) {
return (new Levels()).updateLevels(levels);
}
/**
* Update the levels given a string representation of the state;
* the levels mentioned here will be updated, the ones omitted
* will retain their state as before the function call.
*
* @param levels string representation of levels
*
*/
public Levels updateLevels (String levels) {
String[] parts = levels.split(",");
if (parts.length < 1) {
return this;
}
for (int i = 0; i < parts.length; i++) {
String pair = parts[i];
int offset = pair.indexOf('=');
if (offset != -1) {
String name = pair.substring(0,offset).trim().toLowerCase();
String value = pair.substring(offset+1).trim().toLowerCase();
setLevelState(name, State.parse(value));
}
}
return this;
}
/**
* Set the state of a given level.
*
* @param level name of the level
* @param state the state
* @return returns reference to <code>this</code> for chaning
*/
public Levels setLevelState(String level, State state) {
levelsMap.put(level, state);
return this;
}
/**
* Get the state of a given level.
*
*/
public State getLevelState (String level) {
State s = levelsMap.get(level);
if (s == null) {
return State.UNKNOWN;
}
return s;
}
/**
* For equivalent configurations the toString method should
* emit equal strings.
*
*/
public String toString () {
StringBuilder sbuf = new StringBuilder(80);
boolean first = true;
for (Map.Entry<String, State> me : levelsMap.entrySet()) {
// commas between
if (!first) {
sbuf.append(',');
} else {
first = false;
}
sbuf.append(me.getKey())
.append('=')
.append(me.getValue());
}
return sbuf.toString();
}
public Object clone() {
// quick and dirty, but easily verifiable to be correct
return parse(this.toString());
}
}
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