/*
* [The "BSD license"]
* Copyright (c) 2011 Terence Parr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.stringtemplate.v4.misc;
import org.antlr.runtime.misc.DoubleKeyMap;
import org.stringtemplate.v4.Interpreter;
import org.stringtemplate.v4.ModelAdaptor;
import org.stringtemplate.v4.ST;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
public class ObjectModelAdaptor implements ModelAdaptor {
/** Cache exact attribute type and property name reflection Member object */
protected DoubleKeyMap<Class, String, Member> classAndPropertyToMemberCache =
new DoubleKeyMap<Class, String, Member>();
/** Cached exception to reuse since creation is expensive part.
* Just in case people use "missing" to mean boolean false not error.
*/
static STNoSuchPropertyException cachedException;
public Object getProperty(Interpreter interp, ST self, Object o, Object property, String propertyName)
throws STNoSuchPropertyException
{
Object value = null;
Class c = o.getClass();
if ( property==null ) {
return throwNoSuchProperty(c.getName() + "." + propertyName);
}
// Look in cache for Member first
Member member = classAndPropertyToMemberCache.get(c, propertyName);
if ( member!=null ) {
try {
Class memberClass = member.getClass();
if ( memberClass == Method.class ) return ((Method)member).invoke(o);
if ( memberClass == Field.class ) return ((Field)member).get(o);
}
catch (Exception e) {
throwNoSuchProperty(c.getName() + "." + propertyName);
}
}
return lookupMethod(o, propertyName, value, c);
}
public Object lookupMethod(Object o, String propertyName, Object value, Class c) {
// try getXXX and isXXX properties, look up using reflection
String methodSuffix = Character.toUpperCase(propertyName.charAt(0))+
propertyName.substring(1, propertyName.length());
Method m = Misc.getMethod(c, "get" + methodSuffix);
if ( m==null ) {
m = Misc.getMethod(c, "is"+methodSuffix);
if ( m==null ) {
m = Misc.getMethod(c, "has"+methodSuffix);
}
}
try {
if ( m != null ) {
classAndPropertyToMemberCache.put(c, propertyName, m);
value = Misc.invokeMethod(m, o, value);
}
else {
// try for a visible field
Field f = c.getField(propertyName);
classAndPropertyToMemberCache.put(c, propertyName, f);
try {
value = Misc.accessField(f, o, value);
}
catch (IllegalAccessException iae) {
throwNoSuchProperty(c.getName() + "." + propertyName);
}
}
}
catch (Exception e) {
throwNoSuchProperty(c.getName() + "." + propertyName);
}
return value;
}
protected Object throwNoSuchProperty(String propertyName) {
if ( cachedException==null ) cachedException = new STNoSuchPropertyException();
cachedException.propertyName = propertyName;
throw cachedException;
}
}