LightMetaProperty.java
/*
* Copyright 2001-present Stephen Colebourne
*
* 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 org.joda.beans.impl.light;
import java.lang.annotation.Annotation;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.List;
import org.joda.beans.Bean;
import org.joda.beans.ImmutableBean;
import org.joda.beans.MetaBean;
import org.joda.beans.PropertyStyle;
import org.joda.beans.impl.BasicMetaProperty;
/**
* An immutable meta-property based on a getter interface.
*
* @param <P> the type of the property content
*/
final class LightMetaProperty<P> extends BasicMetaProperty<P> {
/** The meta-bean. */
private final MetaBean metaBean;
/** The type of the property. */
private final Class<P> propertyType;
/** The type of the property. */
private final Type propertyGenericType;
/** The annotations. */
private final List<Annotation> annotations;
/** The read method. */
private final MethodHandle getter;
/** The optional write method. */
private final MethodHandle setter;
/** The index of the property in the constructor. */
private final int constructorIndex;
/** The property style. */
private final PropertyStyle style;
//-----------------------------------------------------------------------
/**
* Creates an instance from a {@code Field}.
*
* @param <P> the property type
* @param metaBean the meta bean, not null
* @param field the field, not null
* @param constructorIndex the index of the property in the constructor
* @return the property, not null
*/
@SuppressWarnings("unchecked")
static <P> LightMetaProperty<P> of(
MetaBean metaBean,
Field field,
MethodHandles.Lookup lookup,
String propertyName,
int constructorIndex) {
MethodHandle getter;
try {
getter = lookup.findGetter(field.getDeclaringClass(), field.getName(), field.getType());
} catch (IllegalArgumentException | NoSuchFieldException | IllegalAccessException ex) {
throw new UnsupportedOperationException("Property cannot be read: " + propertyName, ex);
}
MethodHandle setter = null;
if (!Modifier.isFinal(field.getModifiers())) {
try {
setter = lookup.findSetter(field.getDeclaringClass(), field.getName(), field.getType());
} catch (IllegalArgumentException | NoSuchFieldException | IllegalAccessException ex) {
throw new UnsupportedOperationException("Property cannot be read: " + propertyName, ex);
}
}
return new LightMetaProperty<>(
metaBean,
propertyName,
(Class<P>) field.getType(),
field.getGenericType(),
Arrays.asList(field.getAnnotations()),
getter,
setter,
constructorIndex,
calculateStyle(metaBean, setter));
}
/**
* Creates an instance from a {@code Method}.
*
* @param <P> the property type
* @param metaBean the meta bean, not null
* @param getMethod the method, not null
* @param setMethod the method, not null
* @param constructorIndex the index of the property in the constructor
* @return the property, not null
*/
@SuppressWarnings("unchecked")
static <P> LightMetaProperty<P> of(
MetaBean metaBean,
Field field,
Method getMethod,
Method setMethod,
MethodHandles.Lookup lookup,
String propertyName,
int constructorIndex) {
MethodHandle getter;
try {
MethodType type = MethodType.methodType(getMethod.getReturnType(), getMethod.getParameterTypes());
getter = lookup.findVirtual(field.getDeclaringClass(), getMethod.getName(), type);
} catch (IllegalArgumentException | NoSuchMethodException | IllegalAccessException ex) {
throw new UnsupportedOperationException("Property cannot be read: " + propertyName, ex);
}
MethodHandle setter = null;
if (setMethod != null) {
try {
MethodType type = MethodType.methodType(void.class, setMethod.getParameterTypes());
setter = lookup.findVirtual(field.getDeclaringClass(), setMethod.getName(), type);
} catch (IllegalArgumentException | NoSuchMethodException | IllegalAccessException ex) {
throw new UnsupportedOperationException("Property cannot be written: " + propertyName, ex);
}
}
return new LightMetaProperty<>(
metaBean,
propertyName,
(Class<P>) field.getType(),
field.getGenericType(),
Arrays.asList(field.getAnnotations()),
getter,
setter,
constructorIndex,
calculateStyle(metaBean, setter));
}
private static PropertyStyle calculateStyle(MetaBean metaBean, MethodHandle setter) {
if (ImmutableBean.class.isAssignableFrom(metaBean.beanType())) {
return PropertyStyle.IMMUTABLE;
}
return setter != null ? PropertyStyle.READ_WRITE : PropertyStyle.READ_ONLY;
}
/**
* Creates an instance from a derived {@code Method}.
*
* @param <P> the property type
* @param metaBean the meta bean, not null
* @param getMethod the get method, not null
* @param constructorIndex the index of the property
* @return the property, not null
*/
@SuppressWarnings("unchecked")
static <P> LightMetaProperty<P> of(
MetaBean metaBean,
final Method getMethod,
MethodHandles.Lookup lookup,
final String propertyName,
int constructorIndex) {
MethodHandle getter;
try {
getter = lookup.unreflect(getMethod);
} catch (IllegalArgumentException | IllegalAccessException ex) {
throw new UnsupportedOperationException("Property cannot be read: " + propertyName, ex);
}
return new LightMetaProperty<>(
metaBean,
propertyName,
(Class<P>) getMethod.getReturnType(),
getMethod.getGenericReturnType(),
Arrays.asList(getMethod.getAnnotations()),
getter,
null,
constructorIndex,
PropertyStyle.DERIVED);
}
/**
* Creates an instance.
*
* @param metaBean the meta bean, not null
* @param propertyName the property name, not empty
* @param propertyType the property type
* @param propertyGenericType the property generic type
* @param annotations the annotations
* @param getter the property getter
* @param setter the property setter
* @param constructorIndex the index of the property in the constructor
*/
LightMetaProperty(
MetaBean metaBean,
String propertyName,
Class<P> propertyType,
Type propertyGenericType,
List<Annotation> annotations,
MethodHandle getter,
MethodHandle setter,
int constructorIndex,
PropertyStyle style) {
super(propertyName);
this.metaBean = metaBean;
this.propertyType = propertyType;
this.propertyGenericType = propertyGenericType;
this.annotations = annotations;
this.getter = getter.asType(MethodType.methodType(Object.class, Bean.class));
this.setter = setter != null ? setter.asType(MethodType.methodType(void.class, Bean.class, Object.class)) : null;
this.constructorIndex = constructorIndex;
this.style = style;
}
//-----------------------------------------------------------------------
@Override
public MetaBean metaBean() {
return metaBean;
}
@Override
public Class<?> declaringType() {
return metaBean.beanType();
}
@Override
public Class<P> propertyType() {
return propertyType;
}
@Override
public Type propertyGenericType() {
return propertyGenericType;
}
@Override
public PropertyStyle style() {
return style;
}
@Override
public List<Annotation> annotations() {
return annotations;
}
//-----------------------------------------------------------------------
@Override
public P get(Bean bean) {
try {
return (P) getter.invokeExact(bean);
} catch (RuntimeException | Error ex) {
throw ex;
} catch (Throwable ex) {
throw new RuntimeException(ex);
}
}
@Override
public void set(Bean bean, Object value) {
if (setter == null) {
throw new UnsupportedOperationException("Property cannot be written: " + name());
}
try {
setter.invokeExact(bean, value);
} catch (RuntimeException | Error ex) {
throw ex;
} catch (Throwable ex) {
throw new RuntimeException(ex);
}
}
int getConstructorIndex() {
return constructorIndex;
}
}