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LogSource.java
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/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2026 SciJava developers.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
package org.scijava.log;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringJoiner;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
/**
* Identifies where a {@link LogMessage} came from.
*
* @author Matthias Arzt
*/
public class LogSource {
public static final String SEPARATOR = ":";
private final LogSource parent;
private final List<String> path;
private final ConcurrentMap<String, LogSource> children =
new ConcurrentSkipListMap<>();
private String formatted = null;
private Integer logLevel;
private LogSource(LogSource parent, String name) {
this.parent = parent;
List<String> parentPath = parent.path();
List<String> list = new ArrayList<>(parentPath.size() + 1);
list.addAll(parentPath);
list.add(name);
this.path = Collections.unmodifiableList(list);
}
private LogSource() {
this.parent = null;
this.path = Collections.emptyList();
}
/** Returns the root log source. This LogSource represents the empty list. */
public static LogSource newRoot() {
return new LogSource();
}
/**
* Returns a log source with the given path.
*
* @param subPath Relative path to the source, divided by
* {@link LogSource#SEPARATOR}.
*/
public LogSource subSource(final String subPath) {
LogSource result = this;
for (final String name : subPath.split(SEPARATOR))
result = result.child(name);
return result;
}
/** Returns the list of strings which is represented by this LogSource. */
public List<String> path() {
return path;
}
/** Returns the last entry in the list of strings. */
public String name() {
if (path.isEmpty()) return "";
return path.get(path.size() - 1);
}
@Override
public String toString() {
if (formatted != null) return formatted;
StringJoiner joiner = new StringJoiner(SEPARATOR);
path.forEach(s -> joiner.add(s));
formatted = joiner.toString();
return formatted;
}
public boolean isRoot() {
return parent == null;
}
/** Gets the parent of this source, or null if the source is a root. */
public LogSource parent() {
return parent;
}
public void setLogLevel(int logLevel) {
this.logLevel = logLevel;
}
public boolean hasLogLevel() {
return logLevel != null;
}
public int logLevel() {
if (!hasLogLevel()) throw new IllegalStateException();
return logLevel;
}
// -- Helper methods --
private LogSource child(final String name) {
if (name.isEmpty()) return this;
LogSource child = children.get(name);
if (child != null) return child;
child = new LogSource(this, name);
children.putIfAbsent(name, child);
return children.get(name);
}
}