+++ /dev/null
-/* java.beans.Introspector
- Copyright (C) 1998 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.beans;
-
-import gnu.java.beans.*;
-import java.util.*;
-import java.lang.reflect.*;
-import gnu.java.lang.*;
-
-/**
- * Introspector is the class that does the bulk of the
- * design-time work in Java Beans. Every class must have
- * a BeanInfo in order for an RAD tool to use it; but, as
- * promised, you don't have to write the BeanInfo class
- * yourself if you don't want to. All you have to do is
- * call getBeanInfo() in the Introspector and it will use
- * standard JavaBeans-defined method signatures to
- * determine the information about your class.<P>
- *
- * Don't worry about it too much, though: you can provide
- * JavaBeans with as much customized information as you
- * want, or as little as you want, using the BeanInfo
- * interface (see BeanInfo for details).<P>
- *
- * <STRONG>Order of Operations</STRONG><P>
- *
- * When you call getBeanInfo(class c), the Introspector
- * first searches for BeanInfo class to see if you
- * provided any explicit information. It searches for a
- * class named <bean class name>BeanInfo in different
- * packages, first searching the bean class's package
- * and then moving on to search the beanInfoSearchPath.<P>
- *
- * If it does not find a BeanInfo class, it acts as though
- * it had found a BeanInfo class returning null from all
- * methods (meaning it should discover everything through
- * Introspection). If it does, then it takes the
- * information it finds in the BeanInfo class to be
- * canonical (that is, the information speaks for its
- * class as well as all superclasses).<P>
- *
- * When it has introspected the class, calls
- * getBeanInfo(c.getSuperclass) and adds that information
- * to the information it has, not adding to any information
- * it already has that is canonical.<P>
- *
- * <STRONG>Introspection Design Patterns</STRONG><P>
- *
- * When the Introspector goes in to read the class, it
- * follows a well-defined order in order to not leave any
- * methods unaccounted for. Its job is to step over all
- * of the public methods in a class and determine whether
- * they are part of a property, an event, or a method (in
- * that order).
- *
- *
- * <STRONG>Properties:</STRONG><P>
- *
- * <OL>
- * <LI>If there is a <CODE>public boolean isXXX()</CODE>
- * method, then XXX is a read-only boolean property.
- * <CODE>boolean getXXX()</CODE> may be supplied in
- * addition to this method, although isXXX() is the
- * one that will be used in this case and getXXX()
- * will be ignored. If there is a
- * <CODE>public void setXXX(boolean)</CODE> method,
- * it is part of this group and makes it a read-write
- * property.</LI>
- * <LI>If there is a
- * <CODE>public <type> getXXX(int)</CODE>
- * method, then XXX is a read-only indexed property of
- * type <type>. If there is a
- * <CODE>public void setXXX(int,<type>)</CODE>
- * method, then it is a read-write indexed property of
- * type <type>. There may also be a
- * <CODE>public <type>[] getXXX()</CODE> and a
- * <CODE>public void setXXX(<type>)</CODE>
- * method as well.</CODE></LI>
- * <LI>If there is a
- * <CODE>public void setXXX(int,<type>)</CODE>
- * method, then it is a write-only indexed property of
- * type <type>. There may also be a
- * <CODE>public <type>[] getXXX()</CODE> and a
- * <CODE>public void setXXX(<type>)</CODE>
- * method as well.</CODE></LI>
- * <LI>If there is a
- * <CODE>public <type> getXXX()</CODE> method,
- * then XXX is a read-only property of type
- * <type>. If there is a
- * <CODE>public void setXXX(<type>)</CODE>
- * method, then it will be used for the property and
- * the property will be considered read-write.</LI>
- * <LI>If there is a
- * <CODE>public void setXXX(<type>)</CODE>
- * method, then as long as XXX is not already used as
- * the name of a property, XXX is assumed to be a
- * write-only property of type <type>.</LI>
- * <LI>In all of the above cases, if the setXXX() method
- * throws <CODE>PropertyVetoException</CODE>, then the
- * property in question is assumed to be constrained.
- * No properties are ever assumed to be bound
- * (<STRONG>Spec Note:</STRONG> this is not in the
- * spec, it just makes sense). See PropertyDescriptor
- * for a description of bound and constrained
- * properties.</LI>
- * </OL>
- *
- * <STRONG>Events:</STRONG><P>
- *
- * If there is a pair of methods,
- * <CODE>public void addXXX(<type>)</CODE> and
- * <CODE>public void removeXXX(<type>)</CODE>, where
- * <type> is a descendant of
- * <CODE>java.util.EventListener</CODE>, then the pair of
- * methods imply that this Bean will fire events to
- * listeners of type <type>.<P>
- *
- * If the addXXX() method throws
- * <CODE>java.util.TooManyListenersException</CODE>, then
- * the event set is assumed to be <EM>unicast</EM>. See
- * EventSetDescriptor for a discussion of unicast event
- * sets.<P>
- *
- * <STRONG>Spec Note:</STRONG> the spec seems to say that
- * the listener type's classname must be equal to the XXX
- * part of addXXX() and removeXXX(), but that is not the
- * case in Sun's implementation, so I am assuming it is
- * not the case in general.<P>
- *
- * <STRONG>Methods:</STRONG><P>
- *
- * Any public methods (including those which were used
- * for Properties or Events) are used as Methods.
- *
- * @author John Keiser
- * @since JDK1.1
- * @see java.beans.BeanInfo
- */
-public class Introspector {
-
- public static final int USE_ALL_BEANINFO = 1;
- public static final int IGNORE_IMMEDIATE_BEANINFO = 2;
- public static final int IGNORE_ALL_BEANINFO = 3;
-
- static String[] beanInfoSearchPath = {"gnu.java.beans.info"};
- static Hashtable beanInfoCache = new Hashtable();
-
- private Introspector() {}
-
- /**
- * Get the BeanInfo for class <CODE>beanClass</CODE>,
- * first by looking for explicit information, next by
- * using standard design patterns to determine
- * information about the class.
- *
- * @param beanClass the class to get BeanInfo about.
- * @return the BeanInfo object representing the class.
- */
- public static BeanInfo getBeanInfo(Class beanClass)
- throws IntrospectionException
- {
- BeanInfo cachedInfo;
- synchronized(beanClass)
- {
- cachedInfo = (BeanInfo)beanInfoCache.get(beanClass);
- if(cachedInfo != null)
- {
- return cachedInfo;
- }
- cachedInfo = getBeanInfo(beanClass,null);
- beanInfoCache.put(beanClass,cachedInfo);
- return cachedInfo;
- }
- }
-
- /**
- * Get the BeanInfo for class <CODE>beanClass</CODE>,
- * first by looking for explicit information, next by
- * using standard design patterns to determine
- * information about the class. It crawls up the
- * inheritance tree until it hits <CODE>topClass</CODE>.
- *
- * @param beanClass the Bean class.
- * @param stopClass the class to stop at.
- * @return the BeanInfo object representing the class.
- */
- public static BeanInfo getBeanInfo(Class beanClass, Class stopClass)
- throws IntrospectionException
- {
- ExplicitInfo explicit = new ExplicitInfo(beanClass,stopClass);
-
- IntrospectionIncubator ii = new IntrospectionIncubator();
- ii.setPropertyStopClass(explicit.propertyStopClass);
- ii.setEventStopClass(explicit.eventStopClass);
- ii.setMethodStopClass(explicit.methodStopClass);
- ii.addMethods(beanClass.getMethods());
-
- BeanInfoEmbryo currentInfo = ii.getBeanInfoEmbryo();
- PropertyDescriptor[] p = explicit.explicitPropertyDescriptors;
- if(p!=null)
- {
- for(int i=0;i<p.length;i++)
- {
- if(!currentInfo.hasProperty(p[i]))
- {
- currentInfo.addProperty(p[i]);
- }
- }
- if(explicit.defaultProperty != -1)
- {
- currentInfo.setDefaultPropertyName(p[explicit.defaultProperty].getName());
- }
- }
- EventSetDescriptor[] e = explicit.explicitEventSetDescriptors;
- if(e!=null)
- {
- for(int i=0;i<e.length;i++)
- {
- if(!currentInfo.hasEvent(e[i]))
- {
- currentInfo.addEvent(e[i]);
- }
- }
- if(explicit.defaultEvent != -1)
- {
- currentInfo.setDefaultEventName(e[explicit.defaultEvent].getName());
- }
- }
- MethodDescriptor[] m = explicit.explicitMethodDescriptors;
- if(m!=null)
- {
- for(int i=0;i<m.length;i++)
- {
- if(!currentInfo.hasMethod(m[i]))
- {
- currentInfo.addMethod(m[i]);
- }
- }
- }
-
- if(explicit.explicitBeanDescriptor != null)
- {
- currentInfo.setBeanDescriptor(new BeanDescriptor(beanClass,explicit.explicitBeanDescriptor.getCustomizerClass()));
- }
- else
- {
- currentInfo.setBeanDescriptor(new BeanDescriptor(beanClass,null));
- }
-
- currentInfo.setAdditionalBeanInfo(explicit.explicitBeanInfo);
- currentInfo.setIcons(explicit.im);
-
- return currentInfo.getBeanInfo();
- }
-
- /**
- * Get the search path for BeanInfo classes.
- *
- * @return the BeanInfo search path.
- */
- public static String[] getBeanInfoSearchPath()
- {
- return beanInfoSearchPath;
- }
-
- /**
- * Set the search path for BeanInfo classes.
- * @param beanInfoSearchPath the new BeanInfo search
- * path.
- */
- public static void setBeanInfoSearchPath(String[] beanInfoSearchPath)
- {
- Introspector.beanInfoSearchPath = beanInfoSearchPath;
- }
-
- /**
- * A helper method to convert a name to standard Java
- * naming conventions: anything with two capitals as the
- * first two letters remains the same, otherwise the
- * first letter is decapitalized. URL = URL, I = i,
- * MyMethod = myMethod.
- *
- * @param name the name to decapitalize.
- * @return the decapitalized name.
- */
- public static String decapitalize(String name)
- {
- try
- {
- if(!Character.isUpperCase(name.charAt(0)))
- {
- return name;
- }
- else
- {
- try
- {
- if(Character.isUpperCase(name.charAt(1)))
- {
- return name;
- }
- else
- {
- char[] c = name.toCharArray();
- c[0] = Character.toLowerCase(c[0]);
- return new String(c);
- }
- }
- catch(StringIndexOutOfBoundsException E)
- {
- char[] c = new char[1];
- c[0] = Character.toLowerCase(name.charAt(0));
- return new String(c);
- }
- }
- }
- catch(StringIndexOutOfBoundsException E)
- {
- return name;
- }
- catch(NullPointerException E)
- {
- return null;
- }
- }
-
- static BeanInfo copyBeanInfo(BeanInfo b)
- {
- java.awt.Image[] icons = new java.awt.Image[4];
- for(int i=1;i<=4;i++)
- {
- icons[i-1] = b.getIcon(i);
- }
- return new ExplicitBeanInfo(b.getBeanDescriptor(),
- b.getAdditionalBeanInfo(),
- b.getPropertyDescriptors(),
- b.getDefaultPropertyIndex(),
- b.getEventSetDescriptors(),
- b.getDefaultEventIndex(),
- b.getMethodDescriptors(),icons);
- }
-}
-
-class ExplicitInfo
-{
- BeanDescriptor explicitBeanDescriptor;
- BeanInfo[] explicitBeanInfo;
-
- PropertyDescriptor[] explicitPropertyDescriptors;
- EventSetDescriptor[] explicitEventSetDescriptors;
- MethodDescriptor[] explicitMethodDescriptors;
-
- int defaultProperty;
- int defaultEvent;
-
- java.awt.Image[] im = new java.awt.Image[4];
-
- Class propertyStopClass;
- Class eventStopClass;
- Class methodStopClass;
-
- ExplicitInfo(Class beanClass, Class stopClass)
- {
- while(beanClass != null && !beanClass.equals(stopClass))
- {
- BeanInfo explicit = findExplicitBeanInfo(beanClass);
- if(explicit != null)
- {
- if(explicitBeanDescriptor == null)
- {
- explicitBeanDescriptor = explicit.getBeanDescriptor();
- }
- if(explicitBeanInfo == null)
- {
- explicitBeanInfo = explicit.getAdditionalBeanInfo();
- }
- if(explicitPropertyDescriptors == null)
- {
- if(explicit.getPropertyDescriptors() != null)
- {
- explicitPropertyDescriptors = explicit.getPropertyDescriptors();
- defaultProperty = explicit.getDefaultPropertyIndex();
- propertyStopClass = beanClass;
- }
- }
- if(explicitEventSetDescriptors == null)
- {
- if(explicit.getEventSetDescriptors() != null)
- {
- explicitEventSetDescriptors = explicit.getEventSetDescriptors();
- defaultEvent = explicit.getDefaultEventIndex();
- eventStopClass = beanClass;
- }
- }
- if(explicitMethodDescriptors == null)
- {
- if(explicit.getMethodDescriptors() != null)
- {
- explicitMethodDescriptors = explicit.getMethodDescriptors();
- methodStopClass = beanClass;
- }
- }
- if(im[0] == null && im[1] == null
- && im[2] == null && im[3] == null)
- {
- im[0] = explicit.getIcon(0);
- im[1] = explicit.getIcon(1);
- im[2] = explicit.getIcon(2);
- im[3] = explicit.getIcon(3);
- }
- }
- beanClass = beanClass.getSuperclass();
- }
- if(propertyStopClass == null)
- {
- propertyStopClass = stopClass;
- }
- if(eventStopClass == null)
- {
- eventStopClass = stopClass;
- }
- if(methodStopClass == null)
- {
- methodStopClass = stopClass;
- }
- }
-
- static Hashtable explicitBeanInfos = new Hashtable();
- static Vector emptyBeanInfos = new Vector();
-
- static BeanInfo findExplicitBeanInfo(Class beanClass)
- {
- BeanInfo retval = (BeanInfo)explicitBeanInfos.get(beanClass);
- if(retval != null)
- {
- return retval;
- }
- else if(emptyBeanInfos.indexOf(beanClass) != -1)
- {
- return null;
- }
- else
- {
- retval = reallyFindExplicitBeanInfo(beanClass);
- if(retval != null)
- {
- explicitBeanInfos.put(beanClass,retval);
- }
- else
- {
- emptyBeanInfos.addElement(beanClass);
- }
- return retval;
- }
- }
-
- static BeanInfo reallyFindExplicitBeanInfo(Class beanClass)
- {
- try
- {
- try
- {
- return (BeanInfo)Class.forName(beanClass.getName()+"BeanInfo").newInstance();
- }
- catch(ClassNotFoundException E)
- {
- }
- String newName = ClassHelper.getTruncatedClassName(beanClass) + "BeanInfo";
- for(int i=0;i<Introspector.beanInfoSearchPath.length;i++)
- {
- try
- {
- if(Introspector.beanInfoSearchPath[i].equals(""))
- {
- return (BeanInfo)Class.forName(newName).newInstance();
- }
- else
- {
- return (BeanInfo)Class.forName(Introspector.beanInfoSearchPath[i] + "." + newName).newInstance();
- }
- }
- catch(ClassNotFoundException E)
- {
- }
- }
- }
- catch(IllegalAccessException E)
- {
- }
- catch(InstantiationException E)
- {
- }
- return null;
- }
-}
projects / msp430-gcc.git / blobdiff