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org.rapidoid.beany.BeanProp Maven / Gradle / Ivy
/*-
* #%L
* rapidoid-commons
* %%
* Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
* %%
* 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.
* #L%
*/
package org.rapidoid.beany;
import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.cls.Cls;
import org.rapidoid.cls.TypeKind;
import org.rapidoid.commons.Err;
import org.rapidoid.u.U;
import org.rapidoid.util.Msc;
import org.rapidoid.var.Var;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
@Authors("Nikolche Mihajlovski")
@Since("2.0.0")
public class BeanProp extends RapidoidThing implements Prop {
private final String name;
private volatile Field field;
private volatile Method getter;
private volatile Method setter;
private volatile Class declaringType;
private volatile Class type;
private volatile Class rawType;
private volatile TypeKind typeKind;
private volatile TypeKind rawTypeKind;
private volatile PropKind propKind = PropKind.NORMAL;
private volatile Object defaultValue;
private volatile boolean readOnly = true;
private volatile ParameterizedType genericType;
private volatile ParameterizedType rawGenericType;
public BeanProp(String name) {
this.name = name;
}
public BeanProp(String name, Field field, boolean readOnly) {
this.name = name;
this.field = field;
this.readOnly = readOnly;
}
public void init() {
U.must(field != null || getter != null, "Invalid property: %s", name);
if (getter != null) getter.setAccessible(true);
if (setter != null) setter.setAccessible(true);
if (field != null) field.setAccessible(true);
// TODO: improve inference from getter and setter
if (getter != null) {
rawType = getter.getReturnType();
} else if (setter != null) {
rawType = setter.getParameterTypes()[0];
} else {
rawType = field.getType();
}
type = rawType;
Type gType = field != null ? field.getGenericType() : getter.getGenericReturnType();
genericType = rawGenericType = Cls.generic(gType);
if (Collection.class.isAssignableFrom(type)) {
readOnly = false;
propKind = PropKind.COLLECTION;
} else if (Map.class.isAssignableFrom(type)) {
readOnly = false;
propKind = PropKind.MAP;
} else if (Var.class.isAssignableFrom(type)) {
U.notNull(genericType, "generic type");
gType = genericType.getActualTypeArguments()[0];
genericType = Cls.generic(gType);
type = Cls.clazz(gType);
readOnly = false;
propKind = PropKind.VAR;
}
typeKind = Cls.kindOf(type);
rawTypeKind = Cls.kindOf(rawType);
declaringType = field != null ? field.getDeclaringClass() : getter.getDeclaringClass();
}
public void setGetter(Method getter) {
this.getter = getter;
}
public void setSetter(Method setter) {
this.setter = setter;
}
public Method getGetter() {
return getter;
}
public Method getSetter() {
return setter;
}
public Field getField() {
return field;
}
public void setField(Field field) {
this.field = field;
}
@Override
public String getName() {
return name;
}
@Override
public boolean isReadOnly() {
return readOnly;
}
public void setReadOnly(boolean readOnly) {
this.readOnly = readOnly;
}
@SuppressWarnings("unchecked")
@Override
public T getRaw(Object target) {
// FIXME when target class isn't the property declaring class
try {
if (getter != null) {
return (T) getter.invoke(target);
} else {
return (T) field.get(target);
}
} catch (Exception e) {
if (Msc.rootCause(e) instanceof UnsupportedOperationException) {
return null;
} else {
throw U.rte(e);
}
}
}
@SuppressWarnings("unchecked")
@Override
public T get(Object target) {
return (T) Beany.unwrap(getRaw(target));
}
@Override
public void setRaw(Object target, Object value) {
U.must(!isReadOnly(), "Cannot assign value to a read-only property: %s", name);
normalSet(target, value);
}
@Override
public void set(Object target, Object value) {
U.must(!isReadOnly(), "Cannot assign value to a read-only property: %s", name);
// FIXME when target class isn't the property declaring class
try {
value = Cls.convert(value, getType());
} catch (Exception e) {
throw U.rte("Failed to set value to the bean property: " + getDeclaringType() + "#" + getName(), e);
}
switch (propKind) {
case NORMAL:
normalSet(target, value);
break;
case COLLECTION:
collSet(target, value);
break;
case MAP:
mapSet(target, value);
break;
case VAR:
varSet(target, value);
break;
default:
throw Err.notExpected();
}
}
@Override
public void reset(Object target) {
U.must(!isReadOnly(), "Cannot reset a read-only property: %s", name);
// FIXME when target class isn't the property declaring class
switch (propKind) {
case NORMAL:
if (type.isPrimitive()) {
primitiveReset(target);
} else {
normalSet(target, null);
}
break;
case COLLECTION:
collSet(target, Collections.EMPTY_LIST);
break;
case MAP:
mapSet(target, Collections.EMPTY_MAP);
break;
case VAR:
varSet(target, null);
break;
default:
throw Err.notExpected();
}
}
private void primitiveReset(Object target) {
switch (typeKind) {
case BOOLEAN:
normalSet(target, false);
break;
case BYTE:
normalSet(target, (byte) 0);
break;
case SHORT:
normalSet(target, (short) 0);
break;
case CHAR:
normalSet(target, (char) 0);
break;
case INT:
normalSet(target, 0);
break;
case LONG:
normalSet(target, 0L);
break;
case FLOAT:
normalSet(target, (float) 0);
break;
case DOUBLE:
normalSet(target, (double) 0);
break;
default:
throw Err.notExpected();
}
}
private void varSet(Object target, Object value) {
Var var = getRaw(target);
var.set(value);
}
@SuppressWarnings("unchecked")
private void collSet(Object target, Object value) {
U.must(value instanceof Collection, "Expected a collection, but found: %s", value);
Collection coll = (Collection) get(target);
if (coll == null) {
coll = (Collection) Cls.newInstance(type);
}
coll.clear();
coll.addAll((Collection) value);
}
@SuppressWarnings("unchecked")
private void mapSet(Object target, Object value) {
U.must(value instanceof Map, "Expected a map, but found: %s", value);
Map map = (Map) get(target);
if (map == null) {
map = (Map) Cls.newInstance(type);
}
map.clear();
map.putAll((Map) value);
}
private void normalSet(Object target, Object value) {
try {
if (field != null) {
field.setAccessible(true);
field.set(target, Cls.convert(value, field.getType()));
} else if (setter != null) {
setter.setAccessible(true);
setter.invoke(target, Cls.convert(value, setter.getParameterTypes()[0]));
} else if (getter != null) {
throw Err.notExpected();
}
} catch (Exception e) {
throw U.rte("Invalid value for '%s'!", getName());
}
}
@Override
public Class getType() {
return type;
}
@Override
public TypeKind getTypeKind() {
return typeKind;
}
@Override
public ParameterizedType getGenericType() {
return genericType;
}
public Object getDefaultValue() {
return defaultValue;
}
public void setDefaultValue(Object defaultValue) {
this.defaultValue = defaultValue;
}
@Override
public Class getDeclaringType() {
return declaringType;
}
@Override
public Object getFast(Object target) {
if (getter != null) {
getter.setAccessible(true);
try {
return getter.invoke(target);
} catch (Exception e) {
throw U.rte(e);
}
} else if (field != null) {
field.setAccessible(true);
try {
return field.get(target);
} catch (Exception e) {
throw U.rte(e);
}
} else {
throw U.rte("No field nor getter is available for property '%s' of type '%s'", getName(), getType());
}
}
@Override
public String toString() {
return declaringType.getSimpleName() + "#" + name + ":" + type.getSimpleName();
}
@Override
public int getTypeArgsCount() {
return genericType != null ? genericType.getActualTypeArguments().length : 0;
}
@Override
public Class getTypeArg(int index) {
Err.bounds(index, 0, getTypeArgsCount() - 1);
return Cls.clazz(genericType.getActualTypeArguments()[index]);
}
@Override
public T getAnnotation(Class annotationClass) {
return field != null ? field.getAnnotation(annotationClass) : getter.getAnnotation(annotationClass);
}
@Override
public Annotation[] getAnnotations() {
return field != null ? field.getAnnotations() : getter.getAnnotations();
}
@Override
public Class getRawType() {
return rawType;
}
@Override
public TypeKind getRawTypeKind() {
return rawTypeKind;
}
@Override
public ParameterizedType getRawGenericType() {
return rawGenericType;
}
@Override
public int getRawTypeArgsCount() {
return rawGenericType != null ? rawGenericType.getActualTypeArguments().length : 0;
}
@Override
public Class getRawTypeArg(int index) {
Err.bounds(index, 0, getRawTypeArgsCount() - 1);
return Cls.clazz(rawGenericType.getActualTypeArguments()[index]);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((declaringType == null) ? 0 : declaringType.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((type == null) ? 0 : type.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
BeanProp other = (BeanProp) obj;
if (declaringType == null) {
if (other.declaringType != null)
return false;
} else if (!declaringType.equals(other.declaringType))
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (type == null) {
if (other.type != null)
return false;
} else if (!type.equals(other.type))
return false;
return true;
}
}
