com.rbmhtechnology.vind.annotations.util.FunctionHelpers Maven / Gradle / Ivy
package com.rbmhtechnology.vind.annotations.util;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.ListUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
/**
* Created by fonso on 28.03.17.
*/
public class FunctionHelpers {
public static abstract class ParameterFunction implements Function {
private List parameters = ListUtils.EMPTY_LIST;
public Function setParameters(List parameters) {
this.parameters = parameters;
return this;
}
public List getParameters() {
return parameters;
}
}
public final static class GetterFunction extends ParameterFunction {
private static Logger log = LoggerFactory.getLogger(GetterFunction.class);
@Override
public Object apply(Object o) {
if (CollectionUtils.isNotEmpty(super.parameters)) {
final String propertyName = (String) getParameters().get(0);
try {
final PropertyDescriptor descriptor = PropertyUtils.getPropertyDescriptor(o, propertyName);
final Method readMethod = PropertyUtils.getReadMethod(descriptor);
log.debug("Execute getter method '{}' of class [{}]", readMethod.getName(), o.getClass().getName());
return readMethod.invoke(o);
} catch (InvocationTargetException e) {
log.error("Unable to find property '{}' in object from class [{}]", propertyName, o.getClass().getName(),e);
throw new RuntimeException("Unable to find property '"+propertyName+"' in object from class ["+o.getClass().getName()+"]");
} catch (NoSuchMethodException | IllegalAccessException e) {
log.error("Unable to find/access getter method for property '{}' in object from class [{}]", propertyName, o.getClass().getName(), e);
throw new RuntimeException("Unable to find/access getter method for property '"+propertyName+"' in object from class ["+o.getClass().getName()+"]");
}
} else return null;
}
}
public final static class ConcatFunction extends ParameterFunction {
private static Logger log = LoggerFactory.getLogger(ConcatFunction.class);
@Override
public Object apply(Object o) {
if (CollectionUtils.isNotEmpty(super.parameters)) {
return getParameters().stream()
.map(propertyName -> {
try {
final PropertyDescriptor descriptor = PropertyUtils.getPropertyDescriptor(o, (String) propertyName);
final Method readMethod = PropertyUtils.getReadMethod(descriptor);
log.debug("Execute getter method '{}' of class [{}]", readMethod.getName(), o.getClass().getName());
final Object methodResult = readMethod.invoke(o);
if(Collection.class.isAssignableFrom(methodResult.getClass())) {
return ((Collection) methodResult).stream().map(Object::toString).collect(Collectors.joining(" "));
}
return methodResult.toString();
} catch (InvocationTargetException e) {
log.error("Unable to find property '{}' in object from class [{}]", propertyName, o.getClass().getName(), e);
throw new RuntimeException("Unable to find property '" + propertyName + "' in object from class [" + o.getClass().getName() + "]");
} catch (NoSuchMethodException | IllegalAccessException e) {
log.error("Unable to find/access getter method for property '{}' in object from class [{}]", propertyName, o.getClass().getName(), e);
throw new RuntimeException("Unable to find/access getter method for property '" + propertyName + "' in object from class [" + o.getClass().getName() + "]");
}
})
.collect(Collectors.joining(" "));
} else return null;
}
}
}