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/*
* Copyright 2003-2004 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.tools.ant;
/**
* This class contains all the information
* on a particular ant type,
* the classname, adaptor and the class
* it should be assignable from.
* This type replaces the task/datatype split
* of pre ant 1.6.
*
* @author Peter Reilly
*/
public class AntTypeDefinition {
private String name;
private Class clazz;
private Class adapterClass;
private Class adaptToClass;
private String className;
private ClassLoader classLoader;
/**
* set the definition's name
* @param name the name of the definition
*/
public void setName(String name) {
this.name = name;
}
/**
* return the definition's name
* @return the name of the definition
*/
public String getName() {
return name;
}
/**
* set the class of the definition.
* as a side-effect may set the classloader and classname
* @param clazz the class of this definition
*/
public void setClass(Class clazz) {
this.clazz = clazz;
if (clazz == null) {
return;
}
if (classLoader == null) {
this.classLoader = clazz.getClassLoader();
}
if (className == null) {
this.className = clazz.getName();
}
}
/**
* set the classname of the definition
* @param className the classname of this definition
*/
public void setClassName(String className) {
this.className = className;
}
/**
* get the classname of the definition
* @return the name of the class of this definition
*/
public String getClassName() {
return className;
}
/**
* set the adapter class for this definition.
* this class is used to adapt the definitions class if
* required.
* @param adapterClass the adapterClass
*/
public void setAdapterClass(Class adapterClass) {
this.adapterClass = adapterClass;
}
/**
* set the assignable class for this definition.
* @param adaptToClass the assignable class
*/
public void setAdaptToClass(Class adaptToClass) {
this.adaptToClass = adaptToClass;
}
/**
* set the classloader to use to create an instance
* of the definition
* @param classLoader the classLoader
*/
public void setClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* get the classloader for this definition
* @return the classloader for this definition
*/
public ClassLoader getClassLoader() {
return classLoader;
}
/**
* get the exposed class for this
* definition. This will be a proxy class
* (adapted class) if there is an adapter
* class and the definition class is not
* assignable from the assignable class.
* @param project the current project
* @return the exposed class
*/
public Class getExposedClass(Project project) {
if (adaptToClass != null) {
Class z = getTypeClass(project);
if (z == null) {
return null;
}
if (adaptToClass.isAssignableFrom(z)) {
return z;
}
}
if (adapterClass != null) {
return adapterClass;
}
return getTypeClass(project);
}
/**
* get the definition class
* @param project the current project
* @return the type of the definition
*/
public Class getTypeClass(Project project) {
if (clazz != null) {
return clazz;
}
try {
if (classLoader == null) {
clazz = Class.forName(className);
} else {
clazz = classLoader.loadClass(className);
}
} catch (NoClassDefFoundError ncdfe) {
project.log("Could not load a dependent class ("
+ ncdfe.getMessage() + ") for type "
+ name, Project.MSG_DEBUG);
} catch (ClassNotFoundException cnfe) {
project.log("Could not load class (" + className
+ ") for type " + name, Project.MSG_DEBUG);
}
return clazz;
}
/**
* create an instance of the definition.
* The instance may be wrapped in a proxy class.
* @param project the current project
* @return the created object
*/
public Object create(Project project) {
return icreate(project);
}
/**
* Create a component object based on
* its definition
*/
private Object icreate(Project project) {
Class c = getTypeClass(project);
if (c == null) {
return null;
}
Object o = createAndSet(project, c);
if (o == null || adapterClass == null) {
return o;
}
if (adaptToClass != null) {
if (adaptToClass.isAssignableFrom(o.getClass())) {
return o;
}
}
TypeAdapter adapterObject = (TypeAdapter) createAndSet(
project, adapterClass);
if (adapterObject == null) {
return null;
}
adapterObject.setProxy(o);
return adapterObject;
}
/**
* check if the attributes are correct
* <dl>
* <li>if the class can be created.</li>
* <li>if an adapter class can be created</li>
* <li>if the type is assignable from adapto</li>
* <li>if the type can be used with the adapter class</li>
* </dl>
* @param project the current project
*/
public void checkClass(Project project) {
if (clazz == null) {
clazz = getTypeClass(project);
if (clazz == null) {
throw new BuildException(
"Unable to create class for " + getName());
}
}
// check adapter
if (adapterClass != null) {
boolean needToCheck = true;
if (adaptToClass != null
&& adaptToClass.isAssignableFrom(clazz)) {
needToCheck = false;
}
if (needToCheck) {
TypeAdapter adapter = (TypeAdapter) createAndSet(
project, adapterClass);
if (adapter == null) {
throw new BuildException("Unable to create adapter object");
}
adapter.checkProxyClass(clazz);
}
}
}
/**
* get the constructor of the definition
* and invoke it.
*/
private Object createAndSet(Project project, Class c) {
try {
java.lang.reflect.Constructor ctor = null;
boolean noArg = false;
// DataType can have a "no arg" constructor or take a single
// Project argument.
try {
ctor = c.getConstructor(new Class[0]);
noArg = true;
} catch (NoSuchMethodException nse) {
ctor = c.getConstructor(new Class[] {Project.class});
noArg = false;
}
Object o = null;
if (noArg) {
o = ctor.newInstance(new Object[0]);
} else {
o = ctor.newInstance(new Object[] {project});
}
project.setProjectReference(o);
return o;
} catch (java.lang.reflect.InvocationTargetException ex) {
Throwable t = ex.getTargetException();
throw new BuildException(
"Could not create type " + name + " due to " + t, t);
} catch (NoClassDefFoundError ncdfe) {
String msg = "Type " + name + ": A class needed by class "
+ c + " cannot be found: " + ncdfe.getMessage();
throw new BuildException(msg, ncdfe);
} catch (Throwable t) {
throw new BuildException(
"Could not create type " + name + " due to " + t, t);
}
}
/**
* Equality method for this definition (assumes the names are the same)
*
* @param other another definition
* @param project the project the definition
* @return true if the definitions are the same
*/
public boolean sameDefinition(AntTypeDefinition other, Project project) {
if (other == null) {
return false;
}
if (other.getClass() != this.getClass()) {
return false;
}
if (!(other.getTypeClass(project).equals(getTypeClass(project)))) {
return false;
}
if (!other.getExposedClass(project).equals(getExposedClass(project))) {
return false;
}
if (other.adapterClass != adapterClass) {
return false;
}
if (other.adaptToClass != adaptToClass) {
return false;
}
return true;
}
/**
* Similar definition
* used to compare two definitions defined twice with the same
* name and the same types.
* the classloader may be different but have the same
* path so #sameDefinition cannot
* be used.
* @param other the definition to compare to
* @param project the current project
* @return true if the definitions are the same
*/
public boolean similarDefinition(AntTypeDefinition other, Project project) {
if (other == null) {
return false;
}
if (getClass() != other.getClass()) {
return false;
}
if (!getClassName().equals(other.getClassName())) {
return false;
}
if (!extractClassname(adapterClass).equals(
extractClassname(other.adapterClass))) {
return false;
}
if (!extractClassname(adaptToClass).equals(
extractClassname(other.adaptToClass))) {
return false;
}
// all the names are the same: check if the class path of the loader
// is the same
ClassLoader oldLoader = other.getClassLoader();
ClassLoader newLoader = this.getClassLoader();
if (oldLoader != null
&& newLoader != null
&& oldLoader instanceof AntClassLoader
&& newLoader instanceof AntClassLoader
&& ((AntClassLoader) oldLoader).getClasspath()
.equals(((AntClassLoader) newLoader).getClasspath())
) {
return true;
} else {
return false;
}
}
private String extractClassname(Class c) {
if (c == null) {
return "<null>";
} else {
return c.getClass().getName();
}
}
}
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