ucar.util.prefs.Bean Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of netcdf Show documentation
Show all versions of netcdf Show documentation
The NetCDF-Java Library is a Java interface to NetCDF files,
as well as to many other types of scientific data formats.
/*
* Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package ucar.util.prefs;
import java.beans.*;
import java.lang.reflect.*;
import java.io.*;
import java.util.*;
class Bean {
private Object o; // the wrapped object
private BeanParser p = null; // the bean parser (shared for all beans of same class)
// wrap an object in a Bean
public Bean(Object o) {
this.o = o;
}
// create a bean from an XML element
public Bean(org.xml.sax.Attributes atts) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
String className = atts.getValue("class");
Class c = Class.forName( className);
o = c.newInstance();
p = BeanParser.getParser( c);
p.readProperties(o, atts);
}
// write XML using the bean properties of the contained object
public void writeProperties(PrintWriter out) throws IOException {
if (p == null) p = BeanParser.getParser( o.getClass());
p.writeProperties(o, out);
}
// get the wrapped object
public Object getObject() { return o; }
public Class getBeanClass() { return o.getClass(); }
static class Collection {
private java.util.Collection collect; // the underlying collection
private java.lang.Class beanClass; // the class of the beans in the collection
private BeanParser p = null; // the bean parser (shared for all beans of same class)
// wrap a collection in a bean
Collection(java.util.Collection collect) {
this.collect = collect;
if (!collect.isEmpty()) {
Iterator iter = collect.iterator();
beanClass = iter.next().getClass();
p = BeanParser.getParser( beanClass);
}
}
// create a bean collection from an XML element
Collection(org.xml.sax.Attributes atts) throws ClassNotFoundException { // , InstantiationException, IllegalAccessException {
String className = atts.getValue("class");
beanClass = Class.forName( className);
p = BeanParser.getParser( beanClass);
collect = new java.util.ArrayList();
}
// write XML using the bean properties of the specified object
public void writeProperties(PrintWriter out, Object thiso) throws IOException {
p.writeProperties(thiso, out);
}
// get the underlying java.util.Collection
public java.util.Collection getCollection() { return collect; }
public Class getBeanClass() { return beanClass; }
// write XML using the bean properties of the contained object
public Object readProperties(org.xml.sax.Attributes atts) throws InstantiationException, IllegalAccessException {
Object o = beanClass.newInstance();
p.readProperties(o, atts);
collect.add(o);
return o;
}
}
private static class BeanParser {
private static boolean debugBean = false;
private static HashMap parsers = new HashMap();
static BeanParser getParser( Class beanClass) {
BeanParser parser;
if (null == (parser = (BeanParser) parsers.get( beanClass))) {
parser = new BeanParser( beanClass);
parsers.put( beanClass, parser);
}
return parser;
}
private TreeMap properties = new TreeMap();
private Object[] args = new Object[1];
BeanParser( Class beanClass) {
// get bean info
BeanInfo info = null;
try {
info = Introspector.getBeanInfo(beanClass, Object.class);
} catch (IntrospectionException e) {
e.printStackTrace();
}
if (debugBean)
System.out.println( "Bean "+beanClass.getName());
// properties must have read and write method
PropertyDescriptor[] pds = info.getPropertyDescriptors();
for (int i=0; i< pds.length; i++) {
if ((pds[i].getReadMethod() != null) && (pds[i].getWriteMethod() != null)) {
properties.put( pds[i].getName(), pds[i]);
if (debugBean) System.out.println( " property "+pds[i].getName());
}
}
}
void writeProperties(Object bean, PrintWriter out) throws IOException {
Iterator iter = properties.values().iterator();
while (iter.hasNext()) {
PropertyDescriptor pds = (PropertyDescriptor) iter.next();
Method getter = pds.getReadMethod();
try {
Object value = getter.invoke( bean, (Object []) null);
if (value == null)
continue;
if (value instanceof String)
value = XMLStore.quote((String) value);
else if (value instanceof Date)
value = new Long(((Date)value).getTime());
out.print(pds.getName()+"='"+value+"' ");
if (debugBean) System.out.println( " property get "+pds.getName()+"='"+value+"' ");
} catch (InvocationTargetException e) {
} catch (IllegalAccessException e) {
}
}
}
void readProperties(Object bean, org.xml.sax.Attributes atts) {
Iterator iter = properties.values().iterator();
while (iter.hasNext()) {
PropertyDescriptor pds = (PropertyDescriptor) iter.next();
Method setter = pds.getWriteMethod();
try {
String sArg = atts.getValue( pds.getName());
Object arg = getArgument(pds.getPropertyType(), sArg);
if (debugBean) System.out.println( " property set "+pds.getName()+"="+sArg+" == "+arg);
if (arg == null) return;
args[0] = arg;
setter.invoke( bean, args);
} catch (NumberFormatException e) {
} catch (InvocationTargetException e) {
} catch (IllegalAccessException e) {
}
}
}
private Object getArgument( Class c, String value) {
if (c == String.class) return value;
else if (c == int.class) return Integer.valueOf(value);
else if (c == double.class) return Double.valueOf(value);
else if (c == boolean.class) return Boolean.valueOf(value);
else if (c == float.class) return Float.valueOf(value);
else if (c == short.class) return Short.valueOf(value);
else if (c == long.class) return Long.valueOf(value);
else if (c == byte.class) return Byte.valueOf(value);
else if (c == Date.class) {
long time = Long.parseLong(value);
return new Date(time);
}
else return null;
}
}
}