/*
* Copyright 2002-2010 the original author or authors.
*
* 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.springframework.expression;
import org.springframework.core.convert.TypeDescriptor;
/**
* Encapsulates an object and a type descriptor that describes it.
* The type descriptor can hold generic information that would not be
* accessible through a simple <code>getClass()</code> call on the object.
*
* @author Andy Clement
* @author Juergen Hoeller
* @since 3.0
*/
public class TypedValue {
public static final TypedValue NULL = new TypedValue(null, TypeDescriptor.NULL);
private final Object value;
private TypeDescriptor typeDescriptor;
/**
* Create a TypedValue for a simple object. The type descriptor is inferred
* from the object, so no generic information is preserved.
* @param value the object value
*/
public TypedValue(Object value) {
this.value = value;
this.typeDescriptor = null; // initialized when/if requested
}
/**
* Create a TypedValue for a particular value with a particular type descriptor.
* @param value the object value
* @param typeDescriptor a type descriptor describing the type of the value
*/
public TypedValue(Object value, TypeDescriptor typeDescriptor) {
this.value = value;
this.typeDescriptor = typeDescriptor;
}
public Object getValue() {
return this.value;
}
public TypeDescriptor getTypeDescriptor() {
if (this.typeDescriptor == null) {
this.typeDescriptor = TypeDescriptor.forObject(this.value);
}
return this.typeDescriptor;
}
@Override
public String toString() {
StringBuilder str = new StringBuilder();
str.append("TypedValue: '").append(this.value).append("' of [").append(getTypeDescriptor() + "]");
return str.toString();
}
}
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