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JaVers - object auditing and diff framework for Java
package org.javers.common.reflection;
import org.javers.common.exception.JaversException;
import org.javers.common.exception.JaversExceptionCode;
import org.slf4j.Logger;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Optional;
import static org.javers.common.string.ToStringBuilder.typeName;
import static org.slf4j.LoggerFactory.getLogger;
/**
* @author bartosz walacik
*/
public class JaversGetter extends JaversMember {
private static final Logger logger = getLogger(JaversGetter.class);
private static final Object[] EMPTY_ARRAY = new Object[]{};
private final Optional setterMethod;
protected JaversGetter(Method getterMethod, Type resolvedReturnType) {
super(getterMethod, resolvedReturnType);
setterMethod = findSetterForGetter(getterMethod);
}
protected JaversGetter(Method getterMethod, Type resolvedReturnType, boolean looksLikeId) {
super(getterMethod, resolvedReturnType, looksLikeId);
setterMethod = findSetterForGetter(getterMethod);
}
@Override
protected Type getRawGenericType() {
return getRawMember().getGenericReturnType();
}
@Override
public Class getRawType() {
return getRawMember().getReturnType();
}
@Override
public Object getEvenIfPrivate(Object onObject) {
try {
return getRawMember().invoke(onObject, EMPTY_ARRAY);
} catch (IllegalArgumentException ie) {
return getOnMissingProperty(onObject);
} catch (InvocationTargetException | IllegalAccessException e) {
throw new JaversException(JaversExceptionCode.PROPERTY_ACCESS_ERROR,
this, onObject.getClass().getSimpleName(), e.getClass().getName()+": "+e.getMessage());
}
}
@Override
public void setEvenIfPrivate(Object onObject, Object value) {
setterMethod.orElseThrow(() -> new JaversException(JaversExceptionCode.SETTER_NOT_FOUND,
getRawMember().getName(), getRawMember().getDeclaringClass().getName()));
try {
setterMethod.get().invoke(onObject, value);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new JaversException(JaversExceptionCode.SETTER_INVOCATION_ERROR,
setterMethod.get().getName(), onObject.getClass().getName(), e);
}
}
@Override
public String propertyName() {
return getterNameToFieldName(name());
}
private Optional findSetterForGetter(Method getter) {
Class clazz = getter.getDeclaringClass();
String setterName = setterNameForGetterName(getter.getName());
try {
Method setter = clazz.getDeclaredMethod(setterName, getter.getReturnType());
setAccessibleIfNecessary(setter);
return Optional.of(setter);
} catch (NoSuchMethodException e) {
logger.debug("setter for getter '" + clazz.getName() + "." + getter.getName() + " not found");
return Optional.empty();
}
}
private String getterNameToFieldName(String getterName) {
String withoutPrefix = getterNameWithoutPrefix(getterName);
return withoutPrefix.substring(0, 1).toLowerCase() + withoutPrefix.substring(1);
}
private static String setterNameForGetterName(String getterName) {
return "set" + getterNameWithoutPrefix(getterName);
}
private static String getterNameWithoutPrefix(String getterName) {
if (getterName.substring(0, 3).equals("get")) {
return getterName.substring(3);
}
if (getterName.substring(0, 2).equals("is")) {
return getterName.substring(2);
}
throw new IllegalArgumentException("Name {"+getterName+"} is not a getter name");
}
@Override
public String memberType() {
return "Getter";
}
}