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• MainConfigurerMojo.java

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org.apache.camel.maven.packaging.MainConfigurerMojo Maven / Gradle / Ivy

/*
 * 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 org.apache.camel.maven.packaging;

import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;

import org.apache.camel.tooling.model.BaseOptionModel;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.springframework.util.ReflectionUtils;

/**
 * Generate configurer classes for camel-main.
 */
@Mojo(name = "generate-main-configurer", threadSafe = true, defaultPhase = LifecyclePhase.PROCESS_CLASSES)
public class MainConfigurerMojo extends AbstractGeneratorMojo {

    private static final String[] CLASS_NAMES = new String[]{
        "org.apache.camel.main.MainConfigurationProperties",
        "org.apache.camel.main.HystrixConfigurationProperties",
        "org.apache.camel.main.Resilience4jConfigurationProperties",
        "org.apache.camel.main.RestConfigurationProperties",
        "org.apache.camel.ExtendedCamelContext"};

    /**
     * The output directory for generated java source code
     */
    @Parameter(defaultValue = "${project.basedir}/src/generated/java")
    protected File srcOutDir;

    @Parameter(defaultValue = "${project.basedir}/src/generated/resources")
    protected File resourcesOutputDir;

    private DynamicClassLoader projectClassLoader;

    private static class Option extends BaseOptionModel {

        public Option(String name, Class type) {
            // we just use name, type
            setName(name);
            setJavaType(type.getName());
        }
    }

    @Override
    public void execute() throws MojoExecutionException, MojoFailureException {
        List cp = new ArrayList<>();
        cp.add(0, project.getBuild().getOutputDirectory());
        project.getDependencyArtifacts().forEach(a -> {
            if (a.isResolved() && a.getFile() != null) {
                cp.add(a.getFile().getPath());
            }
        });
        projectClassLoader = DynamicClassLoader.createDynamicClassLoader(cp);

        for (String fqn : CLASS_NAMES) {
            try {
                List options = processClass(fqn);
                generateConfigurer(fqn, options);
                generateMetaInfConfigurer(fqn);
            } catch (Exception e) {
                throw new MojoExecutionException("Error processing class: " + fqn, e);
            }
        }
    }

    private List processClass(String name) throws ClassNotFoundException {
        List answer = new ArrayList<>();

        Class clazz = projectClassLoader.loadClass(name);
        // find all public setters
        ReflectionUtils.doWithMethods(clazz, m -> {
            boolean setter = m.getName().length() >= 4 && m.getName().startsWith("set") && Character.isUpperCase(m.getName().charAt(3));
            setter &= Modifier.isPublic(m.getModifiers()) && m.getParameterCount() == 1;
            setter &= filterSetter(m);
            if (setter) {
                String t = Character.toUpperCase(m.getName().charAt(3)) + m.getName().substring(3 + 1);
                answer.add(new Option(t, m.getParameterTypes()[0]));
            }
        });

        return answer;
    }

    private boolean filterSetter(Method setter) {
        // special for some
        if ("setBindingMode".equals(setter.getName())) {
            // we only want the string setter
            return setter.getParameterTypes()[0] == String.class;
        } else if ("setHostNameResolver".equals(setter.getName())) {
            // we only want the string setter
            return setter.getParameterTypes()[0] == String.class;
        }

        return true;
    }

    private void generateConfigurer(String name, List options) throws IOException {
        String pn = "org.apache.camel.main";
        String cn = name.substring(name.lastIndexOf('.') + 1) + "Configurer";
        String en = name;
        String pfqn = name;
        String psn = "org.apache.camel.support.component.PropertyConfigurerSupport";

        StringWriter sw = new StringWriter();
        PropertyMainConfigurerGenerator.generatePropertyConfigurer(pn, cn, en, pfqn, psn, options, sw);

        String source = sw.toString();

        String fileName = pn.replace('.', '/') + "/" + cn + ".java";
        boolean updated = updateResource(srcOutDir.toPath(), fileName, source);
        if (updated) {
            getLog().info("Updated " + fileName);
        }
    }

    private void generateMetaInfConfigurer(String name) {
        String pn = "org.apache.camel.main";
        String en = name.substring(name.lastIndexOf('.') + 1);
        try (Writer w = new StringWriter()) {
            w.append("# " + GENERATED_MSG + "\n");
            w.append("class=").append(pn).append(".").append(en).append("Configurer").append("\n");
            updateResource(resourcesOutputDir.toPath(), "META-INF/services/org/apache/camel/configurer/" + en, w.toString());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}