org.wildfly.channelplugin.MojoConfigurator Maven / Gradle / Ivy
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package org.wildfly.channelplugin;
import org.apache.commons.lang3.NotImplementedException;
import org.apache.maven.plugin.AbstractMojo;
import org.jboss.jandex.*;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.util.*;
/**
* This provides functionality to read default, project specific, Mojo configuration from a file and apply it on a Mojo.
*
* The configuration file would be versioned in a project repository, in a file called
* .wildfly-channel-maven-plugin.
*/
class MojoConfigurator {
private static final String INDEX_PATH = "/META-INF/jandex.idx";
public static final String DEFAULT_CONFIGURATION_FILE = ".wildfly-channel-maven-plugin";
private static final DotName PROPERTY_ANNOTATION_NAME =
DotName.createSimple("org.apache.maven.plugins.annotations.Parameter");
private final Index index;
private final Map preconfiguredParameters;
public MojoConfigurator() throws IOException {
this(new File(DEFAULT_CONFIGURATION_FILE));
}
public MojoConfigurator(File configFile) throws IOException {
try (InputStream input = getClass().getResourceAsStream(INDEX_PATH)) {
IndexReader reader = new IndexReader(input);
index = reader.read();
}
if (configFile.isFile()) {
try {
preconfiguredParameters = readConfiguration(configFile);
} catch (IOException e) {
throw new IllegalArgumentException("Can't read configuration file", e);
}
} else {
preconfiguredParameters = Collections.emptyMap();
}
}
/**
* Reads default system properties configuration from a file and applies it to a Mojo instance.
* @param mojo a Mojo instance to set the parameters to
*/
public void configureProperties(AbstractMojo mojo) {
if (preconfiguredParameters.isEmpty()) {
return; // Nothing to do
}
ClassInfo classInfo = index.getClassByName(mojo.getClass());
for (FieldInfo fieldInfo: classInfo.fields()) {
try {
AnnotationInstance annotation = fieldInfo.annotation(PROPERTY_ANNOTATION_NAME);
if (annotation != null) {
Field field = mojo.getClass().getDeclaredField(fieldInfo.name());
Object currentValue = field.get(mojo);
String preconfiguredValue = preconfiguredParameters.get(annotation.value("property").asString());
if (preconfiguredValue != null && isDefaultValue(currentValue, annotation)) {
if (field.getType().equals(String.class)) {
field.set(mojo, preconfiguredValue);
} else if (field.getType().equals(boolean.class)) {
field.set(mojo, Boolean.valueOf(preconfiguredValue));
} else if (field.getType().equals(List.class)) {
field.set(mojo, Arrays.asList(preconfiguredValue.split(",")));
} else {
throw new NotImplementedException("Don't know how to handle this type: " + field.getType());
}
}
}
} catch (IllegalAccessException e) {
mojo.getLog().error(e.getMessage(), e);
} catch (NoSuchFieldException e) {
mojo.getLog().error("Field not found: " + fieldInfo.name(), e);
}
}
}
private static boolean isDefaultValue(Object currentValue, AnnotationInstance annotation) {
DotName fieldType = ((FieldInfo) annotation.target()).type().name();
String defaultValue = annotation.value("defaultValue") != null ?
annotation.value("defaultValue").asString() : null;
switch (fieldType.toString()) {
case "java.util.List":
// Only return true if no default was set and the current value is empty list or null.
return defaultValue == null && (currentValue == null || ((List) currentValue).isEmpty());
case "java.lang.String":
case "java.lang.Boolean":
return currentValue == null || (defaultValue != null && defaultValue.equals(currentValue));
default:
return false;
}
}
private static Map readConfiguration(File file) throws IOException {
HashMap properties = new HashMap<>();
List lines = Files.readAllLines(file.toPath());
for (String line: lines) {
if (line.isBlank()) {
continue;
}
if (line.startsWith("-D")) {
line = line.substring(2);
}
String[] segments = line.split("=", 2);
if (segments.length == 1) {
properties.put(segments[0], "true");
} else if (segments.length == 2) {
properties.put(segments[0], segments[1]);
} else {
throw new IllegalArgumentException("Can't read configuration, expected lines in format `-Dprop=value`, but got: " + line);
}
}
return properties;
}
}