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/*
 *  Copyright 2010-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.convert;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * Conversion from a string using a static method.
 * 

* The fromString method must meet the following signature:
* {@code static T anyName(String)} on any class. *

* MethodFromStringConverter is thread-safe and immutable. * * @param the type of the converter */ final class MethodFromStringConverter implements TypedFromStringConverter { /** Conversion from a string. */ private final Method fromString; /** Effective type. */ private final Class effectiveType; /** * Creates an instance using two methods. * * @param cls the class this converts for, not null * @param fromString the fromString method, not null * @throws RuntimeException (or subclass) if the method signatures are invalid */ MethodFromStringConverter(Class cls, Method fromString, Class effectiveType) { if (Modifier.isStatic(fromString.getModifiers()) == false) { throw new IllegalStateException("FromString method must be static: " + fromString); } if (fromString.getParameterTypes().length != 1) { throw new IllegalStateException("FromString method must have one parameter: " + fromString); } Class param = fromString.getParameterTypes()[0]; if (param != String.class && param != CharSequence.class) { throw new IllegalStateException("FromString method must take a String or CharSequence: " + fromString); } if (fromString.getReturnType().isAssignableFrom(cls) == false && cls.isAssignableFrom(fromString.getReturnType()) == false) { throw new IllegalStateException("FromString method must return specified class or a supertype: " + fromString); } this.fromString = fromString; this.effectiveType = effectiveType; } //----------------------------------------------------------------------- @Override public T convertFromString(Class cls, String str) { try { return cls.cast(fromString.invoke(null, str)); } catch (IllegalAccessException ex) { throw new IllegalStateException("Method is not accessible: " + fromString); } catch (InvocationTargetException ex) { if (ex.getCause() instanceof RuntimeException) { throw (RuntimeException) ex.getCause(); } throw new RuntimeException(ex.getMessage(), ex.getCause()); } } //------------------------------------------------------------------------- @Override public Class getEffectiveType() { return effectiveType; } }





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