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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 android.util;
/**
* A value model for a {@link Property property} of a host object. This class can be used for
* both reflective and non-reflective property implementations.
*
* @param <H> the host type, where the host is the object that holds this property
* @param <T> the value type
*
* @see Property
* @see ValueModel
*/
public class PropertyValueModel<H, T> extends ValueModel<T> {
private final H mHost;
private final Property<H, T> mProperty;
private PropertyValueModel(H host, Property<H, T> property) {
mProperty = property;
mHost = host;
}
/**
* Returns the host.
*
* @return the host
*/
public H getHost() {
return mHost;
}
/**
* Returns the property.
*
* @return the property
*/
public Property<H, T> getProperty() {
return mProperty;
}
@Override
public Class<T> getType() {
return mProperty.getType();
}
@Override
public T get() {
return mProperty.get(mHost);
}
@Override
public void set(T value) {
mProperty.set(mHost, value);
}
/**
* Return an appropriate PropertyValueModel for this host and property.
*
* @param host the host
* @param property the property
* @return the value model
*/
public static <H, T> PropertyValueModel<H, T> of(H host, Property<H, T> property) {
return new PropertyValueModel<H, T>(host, property);
}
/**
* Return a PropertyValueModel for this {@code host} and a
* reflective property, constructed from this {@code propertyType} and {@code propertyName}.
*
* @param host
* @param propertyType the property type
* @param propertyName the property name
* @return a value model with this host and a reflective property with this type and name
*
* @see Property#of
*/
public static <H, T> PropertyValueModel<H, T> of(H host, Class<T> propertyType,
String propertyName) {
return of(host, Property.of((Class<H>) host.getClass(), propertyType, propertyName));
}
private static Class getNullaryMethodReturnType(Class c, String name) {
try {
return c.getMethod(name).getReturnType();
} catch (NoSuchMethodException e) {
return null;
}
}
private static Class getFieldType(Class c, String name) {
try {
return c.getField(name).getType();
} catch (NoSuchFieldException e) {
return null;
}
}
private static String capitalize(String name) {
if (name.isEmpty()) {
return name;
}
return Character.toUpperCase(name.charAt(0)) + name.substring(1);
}
/**
* Return a PropertyValueModel for this {@code host} and and {@code propertyName}.
*
* @param host the host
* @param propertyName the property name
* @return a value model with this host and a reflective property with this name
*/
public static PropertyValueModel of(Object host, String propertyName) {
Class clazz = host.getClass();
String suffix = capitalize(propertyName);
Class propertyType = getNullaryMethodReturnType(clazz, "get" + suffix);
if (propertyType == null) {
propertyType = getNullaryMethodReturnType(clazz, "is" + suffix);
}
if (propertyType == null) {
propertyType = getFieldType(clazz, propertyName);
}
if (propertyType == null) {
throw new NoSuchPropertyException(propertyName);
}
return of(host, propertyType, propertyName);
}
}
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