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95 lines
3.8 KiB
95 lines
3.8 KiB
/* |
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* Copyright 2010-present Stephen Colebourne |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package com.fr.third.joda.convert; |
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import java.lang.reflect.InvocationTargetException; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Modifier; |
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/** |
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* Conversion to and from a string using two methods. |
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* <p> |
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* The toString method must meet the following signature:<br /> |
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* {@code String anyName()} on Class T. |
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* <p> |
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* The fromString method must meet the following signature:<br /> |
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* {@code static T anyName(String)} on any class. |
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* <p> |
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* MethodsStringConverter is thread-safe and immutable. |
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* |
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* @param <T> the type of the converter |
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*/ |
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final class MethodsStringConverter<T> extends ReflectionStringConverter<T> { |
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/** Conversion from a string. */ |
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private final Method fromString; |
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/** Effective type. */ |
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private final Class<?> effectiveType; |
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/** |
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* Creates an instance using two methods. |
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* @param cls the class this converts for, not null |
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* @param toString the toString method, not null |
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* @param fromString the fromString method, not null |
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* @throws RuntimeException (or subclass) if the method signatures are invalid |
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*/ |
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MethodsStringConverter(Class<T> cls, Method toString, Method fromString, Class<?> effectiveType) { |
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super(cls, toString); |
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if (Modifier.isStatic(fromString.getModifiers()) == false) { |
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throw new IllegalStateException("FromString method must be static: " + fromString); |
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} |
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if (fromString.getParameterTypes().length != 1) { |
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throw new IllegalStateException("FromString method must have one parameter: " + fromString); |
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} |
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Class<?> param = fromString.getParameterTypes()[0]; |
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if (param != String.class && param != CharSequence.class) { |
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throw new IllegalStateException("FromString method must take a String or CharSequence: " + fromString); |
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} |
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if (fromString.getReturnType().isAssignableFrom(cls) == false && cls.isAssignableFrom(fromString.getReturnType()) == false) { |
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throw new IllegalStateException("FromString method must return specified class or a supertype: " + fromString); |
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} |
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this.fromString = fromString; |
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this.effectiveType = effectiveType; |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Converts the {@code String} to an object. |
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* @param cls the class to convert to, not null |
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* @param str the string to convert, not null |
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* @return the converted object, may be null but generally not |
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*/ |
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@Override |
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public T convertFromString(Class<? extends T> cls, String str) { |
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try { |
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return cls.cast(fromString.invoke(null, str)); |
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} catch (IllegalAccessException ex) { |
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throw new IllegalStateException("Method is not accessible: " + fromString); |
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} catch (InvocationTargetException ex) { |
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if (ex.getCause() instanceof RuntimeException) { |
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throw (RuntimeException) ex.getCause(); |
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} |
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throw new RuntimeException(ex.getMessage(), ex.getCause()); |
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} |
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} |
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//------------------------------------------------------------------------- |
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@Override |
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public Class<?> getEffectiveType() { |
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return effectiveType; |
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} |
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}
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