//$Id: BasicPropertyAccessor.java 7516 2005-07-16 22:20:48Z oneovthafew $
package org.hibernate.property;
import java.beans.Introspector;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.PropertyAccessException;
import org.hibernate.PropertyNotFoundException;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.util.ReflectHelper;
/**
* Accesses property values via a get/set pair, which may be nonpublic.
* The default (and recommended strategy).
* @author Gavin King
*/
public class BasicPropertyAccessor implements PropertyAccessor {
private static final Log log = LogFactory.getLog(BasicPropertyAccessor.class);
public static final class BasicSetter implements Setter {
private Class clazz;
private final transient Method method;
private final String propertyName;
private BasicSetter(Class clazz, Method method, String propertyName) {
this.clazz=clazz;
this.method=method;
this.propertyName=propertyName;
}
public void set(Object target, Object value, SessionFactoryImplementor factory)
throws HibernateException {
try {
method.invoke( target, new Object[] { value } );
}
catch (NullPointerException npe) {
if ( value==null && method.getParameterTypes()[0].isPrimitive() ) {
throw new PropertyAccessException(
npe,
"Null value was assigned to a property of primitive type",
true,
clazz,
propertyName
);
}
else {
throw new PropertyAccessException(
npe,
"NullPointerException occurred while calling",
true,
clazz,
propertyName
);
}
}
catch (InvocationTargetException ite) {
throw new PropertyAccessException(
ite,
"Exception occurred inside",
true,
clazz,
propertyName
);
}
catch (IllegalAccessException iae) {
throw new PropertyAccessException(
iae,
"IllegalAccessException occurred while calling",
true,
clazz,
propertyName
);
//cannot occur
}
catch (IllegalArgumentException iae) {
if ( value==null && method.getParameterTypes()[0].isPrimitive() ) {
throw new PropertyAccessException(
iae,
"Null value was assigned to a property of primitive type",
true,
clazz,
propertyName
);
}
else {
log.error(
"IllegalArgumentException in class: " + clazz.getName() +
", setter method of property: " + propertyName
);
log.error(
"expected type: " +
method.getParameterTypes()[0].getName() +
", actual value: " +
( value==null ? null : value.getClass().getName() )
);
throw new PropertyAccessException(
iae,
"IllegalArgumentException occurred while calling",
true,
clazz,
propertyName
);
}
}
}
public Method getMethod() {
return method;
}
public String getMethodName() {
return method.getName();
}
Object readResolve() {
return createSetter(clazz, propertyName);
}
public String toString() {
return "BasicSetter(" + clazz.getName() + '.' + propertyName + ')';
}
}
public static final class BasicGetter implements Getter {
private Class clazz;
private final transient Method method;
private final String propertyName;
private BasicGetter(Class clazz, Method method, String propertyName) {
this.clazz=clazz;
this.method=method;
this.propertyName=propertyName;
}
public Object get(Object target) throws HibernateException {
try {
return method.invoke(target, null);
}
catch (InvocationTargetException ite) {
throw new PropertyAccessException(
ite,
"Exception occurred inside",
false,
clazz,
propertyName
);
}
catch (IllegalAccessException iae) {
throw new PropertyAccessException(
iae,
"IllegalAccessException occurred while calling",
false,
clazz,
propertyName
);
//cannot occur
}
catch (IllegalArgumentException iae) {
log.error(
"IllegalArgumentException in class: " + clazz.getName() +
", getter method of property: " + propertyName
);
throw new PropertyAccessException(
iae,
"IllegalArgumentException occurred calling",
false,
clazz,
propertyName
);
}
}
public Object getForInsert(Object target, Map mergeMap, SessionImplementor session) {
return get( target );
}
public Class getReturnType() {
return method.getReturnType();
}
public Method getMethod() {
return method;
}
public String getMethodName() {
return method.getName();
}
public String toString() {
return "BasicGetter(" + clazz.getName() + '.' + propertyName + ')';
}
Object readResolve() {
return createGetter(clazz, propertyName);
}
}
public Setter getSetter(Class theClass, String propertyName)
throws PropertyNotFoundException {
return createSetter(theClass, propertyName);
}
private static Setter createSetter(Class theClass, String propertyName)
throws PropertyNotFoundException {
BasicSetter result = getSetterOrNull(theClass, propertyName);
if (result==null) {
throw new PropertyNotFoundException(
"Could not find a setter for property " +
propertyName +
" in class " +
theClass.getName()
);
}
return result;
}
private static BasicSetter getSetterOrNull(Class theClass, String propertyName) {
if (theClass==Object.class || theClass==null) return null;
Method method = setterMethod(theClass, propertyName);
if (method!=null) {
if ( !ReflectHelper.isPublic(theClass, method) ) method.setAccessible(true);
return new BasicSetter(theClass, method, propertyName);
}
else {
BasicSetter setter = getSetterOrNull( theClass.getSuperclass(), propertyName );
if (setter==null) {
Class[] interfaces = theClass.getInterfaces();
for ( int i=0; setter==null && i<interfaces.length; i++ ) {
setter=getSetterOrNull( interfaces[i], propertyName );
}
}
return setter;
}
}
private static Method setterMethod(Class theClass, String propertyName) {
BasicGetter getter = getGetterOrNull(theClass, propertyName);
Class returnType = (getter==null) ? null : getter.getReturnType();
Method[] methods = theClass.getDeclaredMethods();
Method potentialSetter = null;
for (int i=0; i<methods.length; i++) {
String methodName = methods[i].getName();
if ( methods[i].getParameterTypes().length==1 && methodName.startsWith("set") ) {
String testStdMethod = Introspector.decapitalize( methodName.substring(3) );
String testOldMethod = methodName.substring(3);
if ( testStdMethod.equals(propertyName) || testOldMethod.equals(propertyName) ) {
potentialSetter = methods[i];
if ( returnType==null || methods[i].getParameterTypes()[0].equals(returnType) ) {
return potentialSetter;
}
}
}
}
return potentialSetter;
}
public Getter getGetter(Class theClass, String propertyName)
throws PropertyNotFoundException {
return createGetter(theClass, propertyName);
}
public static Getter createGetter(Class theClass, String propertyName)
throws PropertyNotFoundException {
BasicGetter result = getGetterOrNull(theClass, propertyName);
if (result==null) {
throw new PropertyNotFoundException(
"Could not find a getter for " +
propertyName +
" in class " +
theClass.getName()
);
}
return result;
}
private static BasicGetter getGetterOrNull(Class theClass, String propertyName) {
if (theClass==Object.class || theClass==null) return null;
Method method = getterMethod(theClass, propertyName);
if (method!=null) {
if ( !ReflectHelper.isPublic(theClass, method) ) method.setAccessible(true);
return new BasicGetter(theClass, method, propertyName);
}
else {
BasicGetter getter = getGetterOrNull( theClass.getSuperclass(), propertyName );
if (getter==null) {
Class[] interfaces = theClass.getInterfaces();
for ( int i=0; getter==null && i<interfaces.length; i++ ) {
getter=getGetterOrNull( interfaces[i], propertyName );
}
}
return getter;
}
}
private static Method getterMethod(Class theClass, String propertyName) {
Method[] methods = theClass.getDeclaredMethods();
for (int i=0; i<methods.length; i++) {
// only carry on if the method has no parameters
if ( methods[i].getParameterTypes().length==0 ) {
String methodName = methods[i].getName();
// try "get"
if ( methodName.startsWith("get") ) {
String testStdMethod = Introspector.decapitalize( methodName.substring(3) );
String testOldMethod = methodName.substring(3);
if ( testStdMethod.equals(propertyName) || testOldMethod.equals(propertyName) ) {
return methods[i];
}
}
// if not "get" then try "is"
/*boolean isBoolean = methods[i].getReturnType().equals(Boolean.class) ||
methods[i].getReturnType().equals(boolean.class);*/
if ( methodName.startsWith("is") ) {
String testStdMethod = Introspector.decapitalize( methodName.substring(2) );
String testOldMethod = methodName.substring(2);
if ( testStdMethod.equals(propertyName) || testOldMethod.equals(propertyName) ) {
return methods[i];
}
}
}
}
return null;
}
}
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