https://projectlombok.org: Spice up your java: Automatic Resource Management, automatic generation of getters, setters, equals, hashCode and toString, and more! 
/*
 * Copyright (C) 2010-2014 The Project Lombok Authors.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package lombok.eclipse.handlers;

import static lombok.core.handlers.HandlerUtil.*;
import static lombok.eclipse.Eclipse.fromQualifiedName;
import static lombok.eclipse.handlers.EclipseHandlerUtil.*;

import java.lang.reflect.Modifier;
import java.util.Arrays;

import lombok.ConfigurationKeys;
import lombok.core.AnnotationValues;
import lombok.eclipse.EclipseAnnotationHandler;
import lombok.eclipse.EclipseNode;
import lombok.eclipse.handlers.EclipseHandlerUtil.MemberExistsResult;

import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.ClassLiteralAccess;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
import org.eclipse.jdt.internal.compiler.ast.StringLiteral;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.mangosdk.spi.ProviderFor;

public class HandleLog {
	private HandleLog() {
		throw new UnsupportedOperationException();
	}
	
	public static void processAnnotation(LoggingFramework framework, AnnotationValues<? extends java.lang.annotation.Annotation> annotation, Annotation source, EclipseNode annotationNode, String loggerTopic) {
		EclipseNode owner = annotationNode.up();
		
		switch (owner.getKind()) {
		case TYPE:
			String logFieldName = annotationNode.getAst().readConfiguration(ConfigurationKeys.LOG_ANY_FIELD_NAME);
			if (logFieldName == null) logFieldName = "log";
			
			boolean useStatic = !Boolean.FALSE.equals(annotationNode.getAst().readConfiguration(ConfigurationKeys.LOG_ANY_FIELD_IS_STATIC));
			
			TypeDeclaration typeDecl = null;
			if (owner.get() instanceof TypeDeclaration) typeDecl = (TypeDeclaration) owner.get();
			int modifiers = typeDecl == null ? 0 : typeDecl.modifiers;
			
			boolean notAClass = (modifiers &
					(ClassFileConstants.AccInterface | ClassFileConstants.AccAnnotation)) != 0;
			
			if (typeDecl == null || notAClass) {
				annotationNode.addError(framework.getAnnotationAsString() + " is legal only on classes and enums.");
				return;
			}
			
			if (fieldExists(logFieldName, owner) != MemberExistsResult.NOT_EXISTS) {
				annotationNode.addWarning("Field '" + logFieldName + "' already exists.");
				return;
			}
			
			ClassLiteralAccess loggingType = selfType(owner, source);
			
			FieldDeclaration fieldDeclaration = createField(framework, source, loggingType, logFieldName, useStatic, loggerTopic);
			fieldDeclaration.traverse(new SetGeneratedByVisitor(source), typeDecl.staticInitializerScope);
			// TODO temporary workaround for issue 217. http://code.google.com/p/projectlombok/issues/detail?id=217
			// injectFieldSuppressWarnings(owner, fieldDeclaration);
			injectField(owner, fieldDeclaration);
			owner.rebuild();
			break;
		default:
			break;
		}
	}
	
	public static ClassLiteralAccess selfType(EclipseNode type, Annotation source) {
		int pS = source.sourceStart, pE = source.sourceEnd;
		long p = (long)pS << 32 | pE;

		TypeDeclaration typeDeclaration = (TypeDeclaration)type.get();
		TypeReference typeReference = new SingleTypeReference(typeDeclaration.name, p);
		setGeneratedBy(typeReference, source);

		ClassLiteralAccess result = new ClassLiteralAccess(source.sourceEnd, typeReference);
		setGeneratedBy(result, source);
		
		return result;
	}
	
	private static FieldDeclaration createField(LoggingFramework framework, Annotation source, ClassLiteralAccess loggingType, String logFieldName, boolean useStatic, String loggerTopic) {
		int pS = source.sourceStart, pE = source.sourceEnd;
		long p = (long) pS << 32 | pE;
		
		// 	private static final <loggerType> log = <factoryMethod>(<parameter>);
		FieldDeclaration fieldDecl = new FieldDeclaration(logFieldName.toCharArray(), 0, -1);
		setGeneratedBy(fieldDecl, source);
		fieldDecl.declarationSourceEnd = -1;
		fieldDecl.modifiers = Modifier.PRIVATE | (useStatic ? Modifier.STATIC : 0) | Modifier.FINAL;
		
		fieldDecl.type = createTypeReference(framework.getLoggerTypeName(), source);
		
		MessageSend factoryMethodCall = new MessageSend();
		setGeneratedBy(factoryMethodCall, source);

		factoryMethodCall.receiver = createNameReference(framework.getLoggerFactoryTypeName(), source);
		factoryMethodCall.selector = framework.getLoggerFactoryMethodName().toCharArray();
		
		Expression parameter;
		if (!framework.passTypeName) {
			parameter = null;
		} else if (loggerTopic == null || loggerTopic.trim().length() == 0) {
			parameter = framework.createFactoryParameter(loggingType, source);
		} else {
			parameter = new StringLiteral(loggerTopic.toCharArray(), pS, pE, 0);
		}
		
		factoryMethodCall.arguments = parameter != null ? new Expression[] { parameter } : null;
		factoryMethodCall.nameSourcePosition = p;
		factoryMethodCall.sourceStart = pS;
		factoryMethodCall.sourceEnd = factoryMethodCall.statementEnd = pE;
		
		fieldDecl.initialization = factoryMethodCall;
		
		return fieldDecl;
	}
	
	public static TypeReference createTypeReference(String typeName, Annotation source) {
		int pS = source.sourceStart, pE = source.sourceEnd;
		long p = (long)pS << 32 | pE;
		
		TypeReference typeReference;
		if (typeName.contains(".")) {
			
			char[][] typeNameTokens = fromQualifiedName(typeName);
			long[] pos = new long[typeNameTokens.length];
			Arrays.fill(pos, p);
			
			typeReference = new QualifiedTypeReference(typeNameTokens, pos);
		}
		else {
			typeReference = null;
		}
		
		setGeneratedBy(typeReference, source);
		return typeReference;
	}
	
	
Handles the CommonsLog annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.apachecommons.CommonsLog} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleCommonsLog extends EclipseAnnotationHandler<lombok.extern.apachecommons.CommonsLog> {
		@Override public void handle(AnnotationValues<lombok.extern.apachecommons.CommonsLog> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_COMMONS_FLAG_USAGE, "@apachecommons.CommonsLog", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.COMMONS, annotation, source, annotationNode, annotation.getInstance().topic());
		}
	}
	
	
Handles the Log annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.java.Log} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleJulLog extends EclipseAnnotationHandler<lombok.extern.java.Log> {
		@Override public void handle(AnnotationValues<lombok.extern.java.Log> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_JUL_FLAG_USAGE, "@java.Log", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.JUL, annotation, source, annotationNode, annotation.getInstance().topic());
		}
	}
	
	
Handles the Log4j annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.log4j.Log4j} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleLog4jLog extends EclipseAnnotationHandler<lombok.extern.log4j.Log4j> {
		@Override public void handle(AnnotationValues<lombok.extern.log4j.Log4j> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_LOG4J_FLAG_USAGE, "@Log4j", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.LOG4J, annotation, source, annotationNode, annotation.getInstance().topic());
		}
	}
	
	
Handles the Log4j2 annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.log4j.Log4j2} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleLog4j2Log extends EclipseAnnotationHandler<lombok.extern.log4j.Log4j2> {
		@Override public void handle(AnnotationValues<lombok.extern.log4j.Log4j2> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_LOG4J2_FLAG_USAGE, "@Log4j2", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.LOG4J2, annotation, source, annotationNode, annotation.getInstance().topic());
		}
	}
	
	
Handles the Slf4j annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.slf4j.Slf4j} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleSlf4jLog extends EclipseAnnotationHandler<lombok.extern.slf4j.Slf4j> {
		@Override public void handle(AnnotationValues<lombok.extern.slf4j.Slf4j> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_SLF4J_FLAG_USAGE, "@Slf4j", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.SLF4J, annotation, source, annotationNode, annotation.getInstance().topic());
		}
	}
	
	
Handles the XSlf4j annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.slf4j.XSlf4j} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleXSlf4jLog extends EclipseAnnotationHandler<lombok.extern.slf4j.XSlf4j> {
		@Override public void handle(AnnotationValues<lombok.extern.slf4j.XSlf4j> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_XSLF4J_FLAG_USAGE, "@XSlf4j", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.XSLF4J, annotation, source, annotationNode, annotation.getInstance().topic());
		}
	}
	
	
Handles the JBossLog annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.jbosslog.JBossLog} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleJBossLog extends EclipseAnnotationHandler<lombok.extern.jbosslog.JBossLog> {
		@Override public void handle(AnnotationValues<lombok.extern.jbosslog.JBossLog> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_JBOSSLOG_FLAG_USAGE, "@JBossLog", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.JBOSSLOG, annotation, source, annotationNode, annotation.getInstance().topic());
		}
	}
	
	
Handles the Flogger annotation for Eclipse. 
/**
	 * Handles the {@link lombok.extern.flogger.Flogger} annotation for Eclipse.
	 */
	@ProviderFor(EclipseAnnotationHandler.class)
	public static class HandleFloggerLog extends EclipseAnnotationHandler<lombok.extern.flogger.Flogger> {
		@Override public void handle(AnnotationValues<lombok.extern.flogger.Flogger> annotation, Annotation source, EclipseNode annotationNode) {
			handleFlagUsage(annotationNode, ConfigurationKeys.LOG_FLOGGER_FLAG_USAGE, "@Flogger", ConfigurationKeys.LOG_ANY_FLAG_USAGE, "any @Log");
			processAnnotation(LoggingFramework.FLOGGER, annotation, source, annotationNode, "");
		}
	}
	
	enum LoggingFramework {
		// private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(TargetType.class);
		COMMONS("org.apache.commons.logging.Log", "org.apache.commons.logging.LogFactory", "getLog", "@CommonsLog"),
		
		// private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(TargetType.class.getName());
		JUL("java.util.logging.Logger", "java.util.logging.Logger", "getLogger", "@Log") {
			@Override public Expression createFactoryParameter(ClassLiteralAccess type, Annotation source) {
				int pS = source.sourceStart, pE = source.sourceEnd;
				long p = (long)pS << 32 | pE;
				
				MessageSend factoryParameterCall = new MessageSend();
				setGeneratedBy(factoryParameterCall, source);
				
				factoryParameterCall.receiver = super.createFactoryParameter(type, source);
				factoryParameterCall.selector = "getName".toCharArray();
				
				factoryParameterCall.nameSourcePosition = p;
				factoryParameterCall.sourceStart = pS;
				factoryParameterCall.sourceEnd = factoryParameterCall.statementEnd = pE;
				
				return factoryParameterCall;
			}
		},
		
		// private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(TargetType.class);
		LOG4J("org.apache.log4j.Logger", "org.apache.log4j.Logger", "getLogger", "@Log4j"),

		// private static final org.apache.logging.log4j.Logger log = org.apache.logging.log4j.LogManager.getLogger(TargetType.class);
		LOG4J2("org.apache.logging.log4j.Logger", "org.apache.logging.log4j.LogManager", "getLogger", "@Log4j2"),

		// private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(TargetType.class);
		SLF4J("org.slf4j.Logger", "org.slf4j.LoggerFactory", "getLogger", "@Slf4j"),
		
		// private static final org.slf4j.ext.XLogger log = org.slf4j.ext.XLoggerFactory.getXLogger(TargetType.class);
		XSLF4J("org.slf4j.ext.XLogger", "org.slf4j.ext.XLoggerFactory", "getXLogger", "@XSlf4j"),

		// private static final org.jboss.logging.Logger log = org.jboss.logging.Logger.getLogger(TargetType.class);
		JBOSSLOG("org.jboss.logging.Logger", "org.jboss.logging.Logger", "getLogger", "@JBossLog"),
		
		// private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingClass();
		FLOGGER("com.google.common.flogger.FluentLogger", "com.google.common.flogger.FluentLogger", "forEnclosingClass", "@Flogger", false),
		;
		
		private final String loggerTypeName;
		private final String loggerFactoryTypeName;
		private final String loggerFactoryMethodName;
		private final String annotationAsString;
		private final boolean passTypeName;
		
		LoggingFramework(String loggerTypeName, String loggerFactoryTypeName, String loggerFactoryMethodName, String annotationAsString, boolean passTypeName) {
			this.loggerTypeName = loggerTypeName;
			this.loggerFactoryTypeName = loggerFactoryTypeName;
			this.loggerFactoryMethodName = loggerFactoryMethodName;
			this.annotationAsString = annotationAsString;
			this.passTypeName = passTypeName;
		}
		
		LoggingFramework(String loggerTypeName, String loggerFactoryTypeName, String loggerFactoryMethodName, String annotationAsString) {
			this.loggerTypeName = loggerTypeName;
			this.loggerFactoryTypeName = loggerFactoryTypeName;
			this.loggerFactoryMethodName = loggerFactoryMethodName;
			this.annotationAsString = annotationAsString;
			this.passTypeName = true;
		}
		
		final String getAnnotationAsString() {
			return annotationAsString;
		}
		
		final String getLoggerTypeName() {
			return loggerTypeName;
		}
		
		final String getLoggerFactoryTypeName() {
			return loggerFactoryTypeName;
		}
		
		final String getLoggerFactoryMethodName() {
			return loggerFactoryMethodName;
		}
		
		Expression createFactoryParameter(ClassLiteralAccess loggingType, Annotation source) {
			TypeReference copy = copyType(loggingType.type, source);
			ClassLiteralAccess result = new ClassLiteralAccess(source.sourceEnd, copy);
			setGeneratedBy(result, source);
			return result;
		};
	}
}