Commons Attributes example source code file (RuntimeAttributeRepository.java)
The Commons Attributes RuntimeAttributeRepository.java source code
/*
* Copyright 2003-2004 The Apache Software Foundation
*
* 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.apache.commons.attributes;
import java.lang.reflect.Field;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Set;
import java.util.Map;
import java.util.HashMap;
import java.util.HashSet;
import java.util.ArrayList;
import java.util.List;
/**
* Class used to define attributes programmatically for a class.
* It is recommended that this class is used in the static initializer for
* a class:
* <pre>
*
* @since 2.1
*/
public class RuntimeAttributeRepository implements AttributeRepositoryClass {
/**
* Flag indicating whether this repository is modifiable.
* Once sealed, a repository can't be un-sealed.
*/
private volatile boolean sealed = false;
/**
* Set of class attributes. See javadoc for {@link AttributeRepositoryClass} for structure.
*/
private final Set classAttributes = new HashSet ();
/**
* Set of field attributes. See javadoc for {@link AttributeRepositoryClass} for structure.
*/
private final Map fieldAttributes = new HashMap ();
/**
* Set of ctor attributes. See javadoc for {@link AttributeRepositoryClass} for structure.
*/
private final Map constructorAttributes = new HashMap ();
/**
* Set of method attributes. See javadoc for {@link AttributeRepositoryClass} for structure.
*/
private final Map methodAttributes = new HashMap ();
/**
* Class we are defining attributes for.
*/
private final Class clazz;
/**
* Synchronization lock for sealing the repository. We use this instead of
* synchronizing on the instance (this), since the sync:ing was added
* in 2.2 and we don't want to break any code.
*
* @since 2.2
*/
private final Object syncLock = new Object ();
/**
* Create a new runtime repository.
*
* @since 2.1
*/
public RuntimeAttributeRepository (Class clazz) {
this.clazz = clazz;
}
/**
* Adds a new attribute to the class itself.
*
* @since 2.1
*/
public void addClassAttribute (Object attribute) {
checkSealed ();
classAttributes.add (attribute);
}
/**
* Convenience function to check if the repository is sealed.
*
* @throws IllegalStateException if sealed
*
* @since 2.1
*/
private void checkSealed () throws IllegalStateException {
synchronized (syncLock) {
if (sealed) {
throw new IllegalStateException ("RuntimeAttributeRepository has been sealed.");
}
}
}
/**
* Convenience method to get and initialize an enry in the method or
* constructor attribute map.
*
* @since 2.1
*/
private List getMethodOrConstructorAttributeBundle (Map map, String signature, int numSlots) {
List bundle = (List) map.get (signature);
if (bundle == null) {
bundle = new ArrayList ();
map.put (signature, bundle);
for (int i = 0; i < numSlots; i++) {
bundle.add (new HashSet ());
}
}
return bundle;
}
/**
* Convenience method to get and initialize an entry in the method map.
*
* @return a fully initialized List (as defined for the {@link AttributeRepositoryClass} interface)
* for the given method.
*
* @since 2.1
*/
private List getMethodAttributeBundle (Method m) {
String signature = Util.getSignature (m);
if (m.getDeclaringClass () != clazz) {
throw new IllegalArgumentException ("There is no " + signature + " in " + clazz.getName () + ". It is defined in " +
m.getDeclaringClass ().getName ());
}
return getMethodOrConstructorAttributeBundle (methodAttributes, signature, m.getParameterTypes ().length + 2);
}
/**
* Convenience method to get and initialize an entry in the constructor map.
*
* @return a fully initialized List (as defined for the {@link AttributeRepositoryClass} interface)
* for the given constructor.
*
* @since 2.1
*/
private List getConstructorAttributeBundle (Constructor c) {
String signature = Util.getSignature (c);
if (c.getDeclaringClass () != clazz) {
throw new IllegalArgumentException ("There is no " + signature + " in " + clazz.getName () + ". It is defined in " +
c.getDeclaringClass ().getName ());
}
return getMethodOrConstructorAttributeBundle (constructorAttributes, signature, c.getParameterTypes ().length + 1);
}
/**
* Adds an attribute to a field.
*
* @since 2.1
*/
public void addFieldAttribute (String name, Object attribute) throws NoSuchFieldException, SecurityException {
addFieldAttribute (clazz.getDeclaredField (name), attribute);
}
/**
* Adds an attribute to a field.
*
* @since 2.1
*/
public void addFieldAttribute (Field f, Object attribute) {
checkSealed ();
String signature = f.getName ();
if (f.getDeclaringClass () != clazz) {
throw new IllegalArgumentException ("There is no " + signature + " in " + clazz.getName () + ". It is defined in " +
f.getDeclaringClass ().getName ());
}
Set attributeSet = (Set) fieldAttributes.get (signature);
if (attributeSet == null) {
attributeSet = new HashSet ();
fieldAttributes.put (signature, attributeSet);
}
attributeSet.add (attribute);
}
/**
* Adds an attribute to a constructor. The constructor is obtained via the getDeclaredConstrutor method
* of the class this repository defines.
*
* @since 2.1
*/
public void addConstructorAttribute (Class[] parameters, Object attribute) throws NoSuchMethodException, SecurityException {
addConstructorAttribute (clazz.getDeclaredConstructor (parameters), attribute);
}
/**
* Adds an attribute to a constructor.
*
* @since 2.1
*/
public void addConstructorAttribute (Constructor c, Object attribute) {
checkSealed ();
List bundle = getConstructorAttributeBundle (c);
Set ctorAttrs = (Set) bundle.get (0);
ctorAttrs.add (attribute);
}
/**
* Adds an attribute to a method. The method is obtained via the getDeclaredMethod method
* of the class this repository defines.
*
* @since 2.1
*/
public void addMethodAttribute (String name, Class[] parameters, Object attribute) throws NoSuchMethodException, SecurityException {
addMethodAttribute (clazz.getDeclaredMethod (name, parameters), attribute);
}
/**
* Adds an attribute to a method.
*
* @since 2.1
*/
public void addMethodAttribute (Method m, Object attribute) {
checkSealed ();
List bundle = getMethodAttributeBundle (m);
Set methodAttrs = (Set) bundle.get (0);
methodAttrs.add (attribute);
}
/**
* Adds an attribute to a parameter of a constructor. The constructor is obtained via the getDeclaredConstrutor method
* of the class this repository defines.
*
* @since 2.1
*/
public void addParameterAttribute (Class[] parameters, int parameterIndex, Object attribute) throws NoSuchMethodException, SecurityException {
addParameterAttribute (clazz.getDeclaredConstructor (parameters), parameterIndex, attribute);
}
/**
* Adds an attribute to a parameter of a constructor.
*
* @since 2.1
*/
public void addParameterAttribute (Constructor c, int parameterIndex, Object attribute) {
checkSealed ();
List bundle = getConstructorAttributeBundle (c);
Set parameterAttrs = (Set) bundle.get (parameterIndex + 1);
parameterAttrs.add (attribute);
}
/**
* Adds an attribute to a parameter of a method. The method is obtained via the getDeclaredMethod method
* of the class this repository defines.
*
* @since 2.1
*/
public void addParameterAttribute (String name, Class[] parameters, int parameterIndex, Object attribute) throws NoSuchMethodException, SecurityException {
addParameterAttribute (clazz.getDeclaredMethod (name, parameters), parameterIndex, attribute);
}
/**
* Adds an attribute to a parameter of a method. The method is obtained via the getDeclaredMethod method
* of the class this repository defines.
*
* @since 2.1
*/
public void addParameterAttribute (Method m, int parameterIndex, Object attribute) {
checkSealed ();
List bundle = getMethodAttributeBundle (m);
Set parameterAttrs = (Set) bundle.get (parameterIndex + 2);
parameterAttrs.add (attribute);
}
/**
* Adds an attribute to the return value of a method. The method is obtained via the getDeclaredMethod method
* of the class this repository defines.
*
* @since 2.1
*/
public void addReturnAttribute (String name, Class[] parameters, Object attribute) throws NoSuchMethodException, SecurityException {
addReturnAttribute (clazz.getDeclaredMethod (name, parameters), attribute);
}
/**
* Adds an attribute to the return value of a method. The method is obtained via the getDeclaredMethod method
* of the class this repository defines.
*
* @since 2.1
*/
public void addReturnAttribute (Method m, Object attribute) {
checkSealed ();
List bundle = getMethodAttributeBundle (m);
Set returnAttrs = (Set) bundle.get (1);
returnAttrs.add (attribute);
}
/**
* Gets the class this repository defines attributes for.
*
* @since 2.1
*/
public Class getDefinedClass () {
return clazz;
}
public Set getClassAttributes () {
return classAttributes;
}
public Map getFieldAttributes () {
return fieldAttributes;
}
public Map getMethodAttributes () {
return methodAttributes;
}
public Map getConstructorAttributes () {
return constructorAttributes;
}
/**
* Seals this repository. A sealed repository can't be modified.
*
* @since 2.1
*/
public void seal () {
synchronized (syncLock) {
sealed = true;
}
}
}
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