/*
* GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Contact info: lobochief@users.sourceforge.net
*/
package com.nvarghese.beowulf.common.cobra.js;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.WrappedException;
public class JavaObjectWrapper extends ScriptableObject {
private static final Logger logger = Logger.getLogger(JavaObjectWrapper.class.getName());
private static final boolean loggableInfo = logger.isLoggable(Level.INFO);
private final Object delegate;
private final JavaClassWrapper classWrapper;
public JavaObjectWrapper(final JavaClassWrapper classWrapper) throws InstantiationException, IllegalAccessException {
this.classWrapper = classWrapper;
// Retaining a strong reference, but note
// that the object wrapper map uses weak keys
// and weak values.
Object delegate = this.classWrapper.newInstance();
this.delegate = delegate;
}
public JavaObjectWrapper(final JavaClassWrapper classWrapper, final Object delegate) {
if (delegate == null) {
throw new IllegalArgumentException("Argument delegate cannot be null.");
}
this.classWrapper = classWrapper;
// Retaining a strong reference, but note
// that the object wrapper map uses weak keys
// and weak values.
this.delegate = delegate;
}
/**
* Returns the Java object.
*
* @return An object or <code>null</code> if garbage collected.
*/
public Object getJavaObject() {
// Cannot retain delegate with a strong reference.
return this.delegate;
}
public String getClassName() {
return this.classWrapper.getClassName();
}
public Object get(final int index, final Scriptable start) {
PropertyInfo pinfo = this.classWrapper.getIntegerIndexer();
if (pinfo == null) {
return super.get(index, start);
} else {
try {
Method getter = pinfo.getGetter();
if (getter == null) {
throw new EvaluatorException("Indexer is write-only");
}
// Cannot retain delegate with a strong reference.
Object javaObject = this.getJavaObject();
if (javaObject == null) {
throw new IllegalStateException("Java object (class=" + this.classWrapper + ") is null.");
}
Object raw = getter.invoke(javaObject, new Object[] { new Integer(index) });
if (raw == null) {
// Return this instead of null.
return Scriptable.NOT_FOUND;
}
return JavaScript.getInstance().getJavascriptObject(raw, this.getParentScope());
} catch (Exception err) {
throw new WrappedException(err);
}
}
}
public Object get(final String name, final Scriptable start) {
PropertyInfo pinfo = this.classWrapper.getProperty(name);
if (pinfo != null) {
Method getter = pinfo.getGetter();
if (getter == null) {
throw new EvaluatorException("Property '" + name + "' is not readable");
}
try {
// Cannot retain delegate with a strong reference.
Object javaObject = this.getJavaObject();
if (javaObject == null) {
throw new IllegalStateException("Java object (class=" + this.classWrapper + ") is null.");
}
Object val = getter.invoke(javaObject, (Object[]) null);
return JavaScript.getInstance().getJavascriptObject(val, start.getParentScope());
} catch (Exception err) {
throw new WrappedException(err);
}
} else {
Function f = this.classWrapper.getFunction(name);
if (f != null) {
return f;
} else {
// Should check properties set in context
// first. Consider element IDs should not
// override Window variables set by user.
Object result = super.get(name, start);
if (result != Scriptable.NOT_FOUND) {
return result;
}
PropertyInfo ni = this.classWrapper.getNameIndexer();
if (ni != null) {
Method getter = ni.getGetter();
if (getter != null) {
// Cannot retain delegate with a strong reference.
Object javaObject = this.getJavaObject();
if (javaObject == null) {
throw new IllegalStateException("Java object (class=" + this.classWrapper + ") is null.");
}
try {
Object val = getter.invoke(javaObject, new Object[] { name });
if (val == null) {
// There might not be an indexer setter.
return super.get(name, start);
} else {
return JavaScript.getInstance().getJavascriptObject(val, start.getParentScope());
}
} catch (Exception err) {
throw new WrappedException(err);
}
}
}
return Scriptable.NOT_FOUND;
}
}
}
public void put(final int index, final Scriptable start, final Object value) {
PropertyInfo pinfo = this.classWrapper.getIntegerIndexer();
if (pinfo == null) {
super.put(index, start, value);
} else {
try {
Method setter = pinfo.getSetter();
if (setter == null) {
throw new EvaluatorException("Indexer is read-only");
}
Object actualValue;
actualValue = JavaScript.getInstance().getJavaObject(value, pinfo.getPropertyType());
setter.invoke(this.getJavaObject(), new Object[] { new Integer(index), actualValue });
} catch (Exception err) {
throw new WrappedException(err);
}
}
}
public void put(final String name, final Scriptable start, final Object value) {
if (value instanceof org.mozilla.javascript.Undefined) {
super.put(name, start, value);
} else {
PropertyInfo pinfo = this.classWrapper.getProperty(name);
if (pinfo != null) {
Method setter = pinfo.getSetter();
if (setter == null) {
throw new EvaluatorException("Property '" + name + "' is not settable in " + this.classWrapper.getClassName() + ".");
}
try {
Object actualValue;
actualValue = JavaScript.getInstance().getJavaObject(value, pinfo.getPropertyType());
setter.invoke(this.getJavaObject(), new Object[] { actualValue });
} catch (IllegalArgumentException iae) {
Exception newException = new IllegalArgumentException("Property named '" + name + "' could not be set with value " + value + ".",
iae);
throw new WrappedException(newException);
} catch (Exception err) {
throw new WrappedException(err);
}
} else {
PropertyInfo ni = this.classWrapper.getNameIndexer();
if (ni != null) {
Method setter = ni.getSetter();
if (setter != null) {
try {
Object actualValue;
actualValue = JavaScript.getInstance().getJavaObject(value, ni.getPropertyType());
setter.invoke(this.getJavaObject(), new Object[] { name, actualValue });
} catch (Exception err) {
throw new WrappedException(err);
}
} else {
super.put(name, start, value);
}
} else {
super.put(name, start, value);
}
}
}
}
public static Function getConstructor(final String className, final JavaClassWrapper classWrapper, final Scriptable scope) {
return new JavaConstructorObject(className, classWrapper);
}
public static Function getConstructor(final String className, final JavaClassWrapper classWrapper, final Scriptable scope,
JavaInstantiator instantiator) {
return new JavaConstructorObject(className, classWrapper, instantiator);
}
public java.lang.Object getDefaultValue(final java.lang.Class hint) {
if (loggableInfo) {
logger.info("getDefaultValue(): hint=" + hint + ",this=" + this.getJavaObject());
}
if (hint == null || String.class.equals(hint)) {
Object javaObject = this.getJavaObject();
if (javaObject == null) {
throw new IllegalStateException("Java object (class=" + this.classWrapper + ") is null.");
}
return javaObject.toString();
} else if (Number.class.isAssignableFrom(hint)) {
Object javaObject = this.getJavaObject();
if (javaObject instanceof Number) {
return javaObject;
} else if (javaObject instanceof String) {
return Double.valueOf((String) javaObject);
} else {
return super.getDefaultValue(hint);
}
} else {
return super.getDefaultValue(hint);
}
}
public String toString() {
Object javaObject = this.getJavaObject();
String type = javaObject == null ? "<null>" : javaObject.getClass().getName();
return "JavaObjectWrapper[object=" + this.getJavaObject() + ",type=" + type + "]";
}
}