org.jfree.xml.factory.objects.ClassFactoryImpl Maven / Gradle / Ivy
/* ========================================================================
* JCommon : a free general purpose class library for the Java(tm) platform
* ========================================================================
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ---------------------
* ClassFactoryImpl.java
* ---------------------
* (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
*
* Original Author: Thomas Morgner;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* $Id: ClassFactoryImpl.java,v 1.6 2006/01/25 23:15:03 taqua Exp $
*
* Changes (from 19-Feb-2003)
* -------------------------
* 19-Feb-2003 : Added standard header and Javadocs (DG);
* 29-Apr-2003 : Distilled from the JFreeReport project and moved into JCommon
* 29-Jul-2004 : Replaced 'enum' variable name (reserved word in JDK 1.5) (DG);
*
*/
package org.jfree.xml.factory.objects;
import java.util.HashMap;
import java.util.Iterator;
import org.jfree.util.Configuration;
import org.jfree.util.ClassComparator;
/**
* An abstract class that implements the {@link ClassFactory} interface.
*
* @author Thomas Morgner.
*/
public abstract class ClassFactoryImpl implements ClassFactory {
/** Storage for the classes. */
private HashMap classes;
/** A class comparator for searching the super class */
private ClassComparator comparator;
/** The parser/report configuration */
private Configuration config;
/**
* Creates a new class factory.
*/
public ClassFactoryImpl() {
this.classes = new HashMap();
this.comparator = new ClassComparator();
}
/**
* Returns the class comparator used to sort the super classes of an object.
*
* @return the class comparator.
*/
public ClassComparator getComparator() {
return this.comparator;
}
/**
* Returns an object-description for a class.
*
* @param c the class.
*
* @return An object description.
*/
public ObjectDescription getDescriptionForClass(final Class c) {
final ObjectDescription od = (ObjectDescription) this.classes.get(c);
if (od == null) {
return null;
}
return od.getInstance();
}
/**
* Returns the most concrete object-description for the super class of a class.
*
* @param d the class.
* @param knownSuperClass a known supported superclass or null, if no superclass
* is known yet.
*
* @return The object description.
*/
public ObjectDescription getSuperClassObjectDescription
(final Class d, ObjectDescription knownSuperClass) {
if (d == null) {
throw new NullPointerException("Description class must not be null.");
}
final Iterator iterator = this.classes.keySet().iterator();
while (iterator.hasNext()) {
final Class keyClass = (Class) iterator.next();
if (keyClass.isAssignableFrom(d)) {
final ObjectDescription od = (ObjectDescription) this.classes.get(keyClass);
if (knownSuperClass == null) {
knownSuperClass = od;
}
else {
if (this.comparator.isComparable
(knownSuperClass.getObjectClass(), od.getObjectClass())) {
if (this.comparator.compare
(knownSuperClass.getObjectClass(), od.getObjectClass()) < 0) {
knownSuperClass = od;
}
}
}
}
}
if (knownSuperClass == null) {
return null;
}
return knownSuperClass.getInstance();
}
/**
* Registers an object description with the factory.
*
* @param key the key.
* @param od the object description.
*/
protected void registerClass(final Class key, final ObjectDescription od) {
this.classes.put(key, od);
if (this.config != null) {
od.configure(this.config);
}
}
/**
* Returns an iterator that provides access to the registered object definitions.
*
* @return The iterator.
*/
public Iterator getRegisteredClasses() {
return this.classes.keySet().iterator();
}
/**
* Configures this factory. The configuration contains several keys and
* their defined values. The given reference to the configuration object
* will remain valid until the report parsing or writing ends.
*
* The configuration contents may change during the reporting.
*
* @param config the configuration, never null
*/
public void configure(final Configuration config) {
if (config == null) {
throw new NullPointerException("The given configuration is null");
}
if (this.config != null) {
// already configured ... ignored
return;
}
this.config = config;
final Iterator it = this.classes.values().iterator();
while (it.hasNext()) {
final ObjectDescription od = (ObjectDescription) it.next();
od.configure(config);
}
}
/**
* Returns the currently set configuration or null, if none was set.
*
* @return the configuration.
*/
public Configuration getConfig() {
return this.config;
}
/**
* Tests for equality.
*
* @param o the object to test.
*
* @return A boolean.
*/
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (!(o instanceof ClassFactoryImpl)) {
return false;
}
final ClassFactoryImpl classFactory = (ClassFactoryImpl) o;
if (!this.classes.equals(classFactory.classes)) {
return false;
}
return true;
}
/**
* Returns a hash code.
*
* @return A hash code.
*/
public int hashCode() {
return this.classes.hashCode();
}
}