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/*
* CacheParameter.java April 2012
*
* Copyright (C) 2012, Niall Gallagher
*
* 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.simpleframework.xml.core;
import java.lang.annotation.Annotation;
/**
* The CacheParameter
object represents a parameter
* which caches its values internally. As well as caching parameter
* values this also caches a key from a Label
object
* which ties the parameter an label together making it possible
* to reference each other from hash containers.
*
* @author Niall Gallagher
*/
class CacheParameter implements Parameter{
/**
* This is the annotation used to represent this parameter.
*/
private final Annotation annotation;
/**
* This is the XPath expression used to represent the parameter.
*/
private final Expression expression;
/**
* This is the name of the element or attribute for the parameter.
*/
private final String name;
/**
* This is the path of the element or attribute for the parameter.
*/
private final String path;
/**
* This is the string representation of this parameter object.
*/
private final String string;
/**
* This is the type within the constructor of this parameter.
*/
private final Class type;
/**
* This is the key that uniquely identifies this parameter.
*/
private final Object key;
/**
* This is the index within the constructor for the parameter.
*/
private final int index;
/**
* Determines if this parameter represents a primitive value.
*/
private final boolean primitive;
/**
* This is true if this parameter is required to exist.
*/
private final boolean required;
/**
* This is true if this parameter represents an attribute.
*/
private final boolean attribute;
/**
* This is true if this parameter represents a text value.
*/
private final boolean text;
/**
* Constructor for the CacheParameter
object. This
* is used to create a parameter that internally caches all of
* the information of the provided parameter and also makes
* use of the label provided to generate a unique key.
*
* @param value this is the parameter to cache values from
* @param label this is the label to acquire the key from
*/
public CacheParameter(Parameter value, Label label) throws Exception {
this.annotation = value.getAnnotation();
this.expression = value.getExpression();
this.attribute = value.isAttribute();
this.primitive = value.isPrimitive();
this.required = label.isRequired();
this.string = value.toString();
this.text = value.isText();
this.index = value.getIndex();
this.name = value.getName();
this.path = value.getPath();
this.type = value.getType();
this.key = label.getKey();
}
/**
* This is the key used to represent the parameter. The key is
* used to store the parameter in hash containers. Unlike the
* path is not necessarily the path for the parameter.
*
* @return this is the key used to represent the parameter
*/
public Object getKey() {
return key;
}
/**
* This is used to acquire the annotated type class. The class
* is the type that is to be deserialized from the XML. This
* is used to validate against annotated fields and methods.
*
* @return this returns the type used for the parameter
*/
public Class getType() {
return type;
}
/**
* This returns the index position of the parameter in the
* constructor. This is used to determine the order of values
* that are to be injected in to the constructor.
*
* @return this returns the index for the parameter
*/
public int getIndex() {
return index;
}
/**
* This is used to acquire the annotation that is used for the
* parameter. The annotation provided will be an XML annotation
* such as the Element
or Attribute
* annotation.
*
* @return this returns the annotation used on the parameter
*/
public Annotation getAnnotation() {
return annotation;
}
/**
* This method is used to return an XPath expression that is
* used to represent the position of this parameter. If there is
* no XPath expression associated with this then an empty path
* is returned. This will never return a null expression.
*
* @return the XPath expression identifying the location
*/
public Expression getExpression() {
return expression;
}
/**
* This is used to acquire the name of the parameter that this
* represents. The name is determined using annotation and
* the name attribute of that annotation, if one is provided.
*
* @return this returns the name of the annotated parameter
*/
public String getName() {
return name;
}
/**
* This is used to acquire the path of the element or attribute
* represented by this parameter. The path is determined by
* acquiring the XPath expression and appending the name of the
* label to form a fully qualified path.
*
* @return returns the path that is used for this parameter
*/
public String getPath() {
return path;
}
/**
* This is used to determine if the parameter is required. If
* an attribute is not required then it can be null. Which
* means that we can inject a null value. Also, this means we
* can match constructors in a more flexible manner.
*
* @return this returns true if the parameter is required
*/
public boolean isRequired() {
return required;
}
/**
* This is used to determine if the parameter is primitive. A
* primitive parameter must not be null. As there is no way to
* provide the value to the constructor. A default value is
* not a good solution as it affects the constructor score.
*
* @return this returns true if the parameter is primitive
*/
public boolean isPrimitive() {
return primitive;
}
/**
* This method is used to determine if the parameter represents
* an attribute. This is used to style the name so that elements
* are styled as elements and attributes are styled as required.
*
* @return this is used to determine if this is an attribute
*/
public boolean isAttribute() {
return attribute;
}
/**
* This is used to determine if the parameter represents text.
* If this represents text it typically does not have a name,
* instead the empty string represents the name. Also text
* parameters can not exist with other text parameters.
*
* @return returns true if this parameter represents text
*/
public boolean isText() {
return text;
}
/**
* This is used to provide a textual representation of the
* parameter. Providing a string describing the parameter is
* useful for debugging and for exception messages.
*
* @return this returns the string representation for this
*/
public String toString() {
return string;
}
}