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Groovy: A powerful, dynamic language for the JVM
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.codehaus.groovy.runtime.typehandling;
import groovy.lang.GString;
/**
* Class providing various short paths for type conversions. Read the comments
* to what conditions have to be met to get valid results!
* Any method here must not depend on the groovy runtime.
*
* @author Jochen Theodorou
*/
public class ShortTypeHandling {
public static Class castToClass(Object object) {
if (object==null) return null;
if (object instanceof Class) return (Class) object;
try {
return Class.forName(object.toString());
} catch (Exception e) {
throw new GroovyCastException(object, Class.class, e);
}
}
public static String castToString(Object object) {
if (object==null) return null;
if (object instanceof Class) return (String) object;
return object.toString();
}
/**
* this class requires that the supplied enum is not fitting a
* Collection case for casting
*/
public static Enum castToEnum(Object object, Class type) {
if (object==null) return null;
if (type.isInstance(object)) return (Enum) object;
if (object instanceof String || object instanceof GString) {
return Enum.valueOf(type, object.toString());
}
throw new GroovyCastException(object, type);
}
public static Character castToChar(Object object) {
if (object==null) return null;
if (object instanceof Character) {
return (Character) object;
} else if (object instanceof Number) {
Number value = (Number) object;
return (char) value.intValue();
}
String text = object.toString();
if (text.length() == 1) {
return text.charAt(0);
} else {
throw new GroovyCastException(text,char.class);
}
}
}