com.adaptc.mws.plugins.testing.transformations.LoggingTransformer.java Source code

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Here is the source code for com.adaptc.mws.plugins.testing.transformations.LoggingTransformer.java

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/*
 * Copyright 2011 SpringSource
 *
 * 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.adaptc.mws.plugins.testing.transformations;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.expr.ArgumentListExpression;
import org.codehaus.groovy.ast.expr.ClassExpression;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.classgen.GeneratorContext;
import org.codehaus.groovy.control.SourceUnit;

import java.lang.reflect.Modifier;
import java.net.URL;

/**
 * Adds a log method to all artifacts.
 * <br /><br />
 * Note that this comes from Grails.
 * @author Graeme Rocher
 */
public class LoggingTransformer implements ClassInjector {
    public static final String LOG_PROPERTY = "log";

    public void performInjection(SourceUnit source, GeneratorContext context, ClassNode classNode) {
        final FieldNode existingField = classNode.getDeclaredField(LOG_PROPERTY);
        if (existingField == null && !classNode.isInterface()) {
            String logName = "plugins." + classNode.getName();
            addLogField(classNode, logName);
        }
    }

    public static void addLogField(ClassNode classNode, String logName) {
        FieldNode logVariable = new FieldNode(LOG_PROPERTY, Modifier.STATIC | Modifier.PRIVATE,
                new ClassNode(Log.class), classNode,
                new MethodCallExpression(new ClassExpression(new ClassNode(LogFactory.class)), "getLog",
                        new ArgumentListExpression(new ConstantExpression(logName))));

        classNode.addField(logVariable);
    }

    public void performInjection(SourceUnit source, ClassNode classNode) {
        performInjection(source, null, classNode);
    }

    public boolean shouldInject(URL url) {
        return true; // Add log property to all artifact types
    }
}