io.ingenieux.lambada.maven.AbstractLambadaMetadataMojo Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 ingenieux Labs
 *
 * 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 io.ingenieux.lambada.maven;

import com.google.common.base.Charsets;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import io.ingenieux.lambada.runtime.LambadaFunction;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.project.MavenProject;
import org.reflections.Reflections;
import org.reflections.scanners.MethodAnnotationsScanner;
import org.reflections.util.ConfigurationBuilder;

import java.io.File;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * A Abstract Metadata Extractor for Lambada Mojos
 */
public abstract class AbstractLambadaMetadataMojo extends AbstractMojo {
    public static final Charset DEFAULT_CHARSET = Charsets.UTF_8;

    /**
     * Maven Project
     */
    @Parameter(defaultValue = "${project}", required = true)
    private MavenProject project;

    static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    static {
        OBJECT_MAPPER.enable(SerializationFeature.INDENT_OUTPUT);
        OBJECT_MAPPER.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        OBJECT_MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        OBJECT_MAPPER.setSerializationInclusion(JsonInclude.Include.NON_DEFAULT);
    }

    protected String defaultIfBlank(String one, String another) {
        return (null != one && (!one.trim().equals(""))) ? one : another;
    }

    public void setClasspathUrls(ConfigurationBuilder configurationBuilder) {
        List classpathElements = null;
        try {
            classpathElements = project.getCompileClasspathElements();
            List projectClasspathList = new ArrayList();

            for (String element : classpathElements) {
                projectClasspathList.add(new File(element).toURI().toURL());
            }

            configurationBuilder.addUrls(projectClasspathList);

            configurationBuilder.addClassLoader(new URLClassLoader(projectClasspathList.toArray(new URL[0]), Thread.currentThread().getContextClassLoader()));
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
    }

    public void execute()
            throws MojoExecutionException {
        try {
            executeInternal();
        } catch (Exception exc) {
            throw new MojoExecutionException("Failure", exc);
        }
    }

    protected abstract void executeInternal() throws Exception;

    protected Set extractRuntimeAnnotations(Class annotation) {
        ConfigurationBuilder cfg = new ConfigurationBuilder();

        cfg.setScanners(new MethodAnnotationsScanner());

        setClasspathUrls(cfg);

        final Reflections ref = new Reflections(cfg);

        return ref.getMethodsAnnotatedWith(annotation);
    }
}