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Result.java
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139 lines (118 loc) · 4.4 KB
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/*
* 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.httprpc;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* Abstract base class for typed results.
*/
public abstract class Result {
private Map<String, Method> mutators;
private static final String SET_PREFIX = "set";
/**
* Constructs a result.
*/
public Result() {
HashMap<String, Method> mutators = new HashMap<>();
Method[] methods = getClass().getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
if (Result.class.isAssignableFrom(method.getDeclaringClass())) {
String methodName = method.getName();
if (methodName.startsWith(SET_PREFIX)) {
int j = SET_PREFIX.length();
int n = methodName.length();
// TODO Call getParameterCount() in Java 8
if (j < n && method.getParameterTypes().length == 1) {
char c = methodName.charAt(j++);
if (j == n || Character.isLowerCase(methodName.charAt(j))) {
c = Character.toLowerCase(c);
}
String key = c + methodName.substring(j);
mutators.put(key, method);
}
}
}
}
this.mutators = Collections.unmodifiableMap(mutators);
}
/**
* Sets a property value.
*
* @param name
* The property name.
*
* @param value
* The property value.
*/
public void set(String name, Object value) {
Method method = mutators.get(name);
if (method != null) {
if (value instanceof Number) {
Number number = (Number)value;
Class<?> type = method.getParameterTypes()[0];
if (type == Byte.TYPE || type == Byte.class) {
value = number.byteValue();
} else if (type == Short.TYPE || type == Short.class) {
value = number.shortValue();
} else if (type == Integer.TYPE || type == Integer.class) {
value = number.intValue();
} else if (type == Long.TYPE || type == Long.class) {
value = number.longValue();
} else if (type == Float.TYPE || type == Float.class) {
value = number.floatValue();
} else if (type == Double.TYPE || type == Double.class) {
value = number.doubleValue();
} else {
throw new IllegalArgumentException(type.getName() + " is not a supported numeric type.");
}
}
try {
method.invoke(this, value);
} catch (InvocationTargetException | IllegalAccessException exception) {
throw new RuntimeException(exception);
}
} else {
setUndefined(name, value);
}
}
/**
* Called by {@link #set(String, Object)} when a setter is not found for a
* given property. The default implementation throws an
* <tt>{@link IllegalArgumentException}</tt>.
*
* @param name
* The property name.
*
* @param value
* The property value.
*/
protected void setUndefined(String name, Object value) {
throw new IllegalArgumentException(String.format("Property \"%s\" is not defined.", name));
}
/**
* Sets a group of property values.
*
* @param map
* A map containing the property values to set.
*/
public void setAll(Map<String, Object> map) {
for (Map.Entry<String, Object> entry : map.entrySet()) {
set(entry.getKey(), entry.getValue());
}
}
}