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Groovy: A powerful multi-faceted language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 groovy.util.logging;
import groovy.lang.GroovyClassLoader;
import groovy.transform.Undefined;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.transform.GroovyASTTransformationClass;
import org.codehaus.groovy.transform.LogASTTransformation;
import org.codehaus.groovy.transform.LogASTTransformation.LoggingStrategy;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import static org.codehaus.groovy.ast.tools.GeneralUtils.args;
import static org.codehaus.groovy.ast.tools.GeneralUtils.callX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.classX;
import static org.codehaus.groovy.ast.tools.GeneralUtils.constX;
/**
* This local transform adds a logging ability to your program using
* java.logging. Every method call on a unbound variable named log
* will be mapped to a call to the logger. For this a log field will be
* inserted in the class. If the field already exists the usage of this transform
* will cause a compilation error. The method name will be used to determine
* what to call on the logger.
*
* import groovy.util.logging.*
* import static java.lang.System.Logger.Level.INFO
*
* {@code @PlatformLog}
* class Foo {
* def method() {
* log.log INFO, 'Foobar'
* }
* }
*
* new Foo().method()
*
*
* @since 4.0.0
*/
@java.lang.annotation.Documented
@Retention(RetentionPolicy.SOURCE)
@Target({ElementType.TYPE})
@GroovyASTTransformationClass("org.codehaus.groovy.transform.LogASTTransformation")
public @interface PlatformLog {
String value() default "log";
String category() default LogASTTransformation.DEFAULT_CATEGORY_NAME;
/**
* If specified, must match the "id" attribute in a VisibilityOptions annotation to enable a custom visibility.
*/
String visibilityId() default Undefined.STRING;
Class loggingStrategy() default JavaUtilLoggingStrategy.class;
/**
* This class contains the logic of how to weave a Java platform logger into the host class.
*/
class JavaUtilLoggingStrategy extends LogASTTransformation.AbstractLoggingStrategyV2 {
private static final ClassNode LOGGER_CLASSNODE = ClassHelper.make(System.Logger.class);
private static final ClassNode LOGGER_FINDER_CLASSNODE = ClassHelper.make(System.LoggerFinder.class);
protected JavaUtilLoggingStrategy(final GroovyClassLoader loader) {
super(loader);
}
@Override
public FieldNode addLoggerFieldToClass(ClassNode classNode, String logFieldName, String categoryName, int fieldModifiers) {
Expression module = callX(classX(classNode), "getModule");
Expression loggerFinder = callX(classX(LOGGER_FINDER_CLASSNODE), "getLoggerFinder");
Expression initialValue = callX(loggerFinder, "getLogger", args(constX(getCategoryName(classNode, categoryName)), module));
return classNode.addField(logFieldName, fieldModifiers, LOGGER_CLASSNODE, initialValue);
}
@Override
public boolean isLoggingMethod(String methodName) {
// return methodName.matches("error|warn|info|debug|trace");
return false;
}
@Override
public Expression wrapLoggingMethodCall(Expression logVariable, String methodName, Expression originalExpression) {
// no shortcut
return originalExpression;
}
}
}