/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.shell;
import com.google.gwt.dev.shell.BrowserChannel.JsObjectRef;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.util.IdentityHashMap;
import java.util.Map;
/**
* Represents a JavaScript value in OOPHM.
*/
public class JsValueOOPHM extends JsValue {
/**
* OOPHM implementation of the DispatchObject interface.
*/
static class DispatchObjectOOPHM implements DispatchObject {
private final CompilingClassLoader classLoader;
private final JavaDispatchImpl javaDispatch;
public DispatchObjectOOPHM(CompilingClassLoader ccl) {
javaDispatch = new JavaDispatchImpl(ccl);
classLoader = ccl;
}
public DispatchObjectOOPHM(CompilingClassLoader ccl, Object val) {
javaDispatch = new JavaDispatchImpl(ccl, val);
classLoader = ccl;
}
public JsValue getField(int dispId) {
JsValueOOPHM jsValue = new JsValueOOPHM();
if (javaDispatch.isField(dispId)) {
Field field = javaDispatch.getField(dispId);
JsValueGlue.set(jsValue, classLoader, field.getType(),
javaDispatch.getFieldValue(dispId));
} else {
MethodAdaptor method = javaDispatch.getMethod(dispId);
AccessibleObject obj = method.getUnderlyingObject();
DispatchMethod dispMethod = (DispatchMethod) classLoader.getWrapperForObject(obj);
if (dispMethod == null) {
dispMethod = new MethodDispatch(classLoader, method);
classLoader.putWrapperForObject(obj, dispMethod);
}
jsValue.setWrappedFunction(method.toString(), dispMethod);
}
return jsValue;
}
public JsValue getField(String name) {
int dispId = getFieldId(name);
if (dispId < 0) {
// no field by that name, return undefined
return new JsValueOOPHM();
}
return getField(dispId);
}
public int getFieldId(String name) {
return classLoader.getDispId(name);
}
public Object getTarget() {
return javaDispatch.getTarget();
}
public void setField(int dispId, JsValue jsValue) {
if (javaDispatch.isMethod(dispId)) {
throw new RuntimeException("Cannot reassign method "
+ javaDispatch.getMethod(dispId).getName());
}
Field field = javaDispatch.getField(dispId);
Object val = JsValueGlue.get(jsValue, classLoader, field.getType(),
"setField");
javaDispatch.setFieldValue(dispId, val);
}
public void setField(String name, JsValue jsValue) {
int dispId = getFieldId(name);
if (dispId < 0) {
// no field by that name, and we do not support expands on Java objects
throw new RuntimeException("No such field " + name);
}
setField(dispId, jsValue);
}
}
/**
* Class used to identify a JavaScript undefined value.
*/
private static class UndefinedValue {
}
public static final String JSE_CLASS = "com.google.gwt.core.client.JavaScriptException";
private static final ThreadLocal<Map<Object, DispatchObject>> dispatchObjectCache = new ThreadLocal<Map<Object, DispatchObject>>();
private static final UndefinedValue undefValue = new UndefinedValue();
/**
* Underlying value.
*
* This may be one of:
*
* <pre>
* - Boolean instance
* - Integer instance
* - Double instance
* - String instance
* - null
* - undefValue
* </pre>
*/
private Object value;
/**
* Create a JsValueMoz object representing the undefined value.
*/
public JsValueOOPHM() {
this.value = undefValue;
}
/**
* Create a JsValueOOPHM object wrapping a JS object given the object
* reference id.
*
* @param jsRefId pointer to underlying JsRootedValue as an integer.
*/
public JsValueOOPHM(int jsRefId) {
this.value = new JsObjectRef(jsRefId);
}
/**
* Copy constructor.
*
* @param other JsValueMoz instance to copy
*/
public JsValueOOPHM(JsValueOOPHM other) {
value = other.value;
}
@Override
public boolean getBoolean() {
return (Boolean) value;
}
@Override
public int getInt() {
return (Integer) value;
}
@Override
public DispatchObject getJavaObjectWrapper() {
return (DispatchObject) value;
}
/**
* @return the value as a JsObjectRef.
*
* Fails if isJavascriptObject() is false.
*/
public JsObjectRef getJavascriptObject() {
return (JsObjectRef) value;
}
@Override
public int getJavaScriptObjectPointer() {
assert isJavaScriptObject();
return ((JsObjectRef) value).getRefid();
}
@Override
public double getNumber() {
return ((Number) value).doubleValue();
}
@Override
public String getString() {
return (String) value;
}
@Override
public String getTypeString() {
if (isBoolean()) {
return "boolean";
} else if (isInt()) {
return "int";
} else if (isJavaScriptObject()) {
JsObjectRef objRef = (JsObjectRef) value;
return "JavaScript object(" + objRef.getRefid() + ")";
} else if (isNull()) {
return "null";
} else if (isNumber()) {
return "number";
} else if (isString()) {
return "string";
} else if (isUndefined()) {
return "undefined";
} else if (isWrappedJavaFunction()) {
return "Java Method";
} else if (isWrappedJavaObject()) {
return "Java Object " + value.getClass().getName();
}
return "unexpected value type";
}
@Override
public DispatchMethod getWrappedJavaFunction() {
return (DispatchMethod) value;
}
@Override
public Object getWrappedJavaObject() {
return ((DispatchObject) value).getTarget();
}
@Override
public boolean isBoolean() {
return value instanceof Boolean;
}
@Override
public boolean isInt() {
return value instanceof Integer;
}
@Override
public boolean isJavaScriptObject() {
return value instanceof JsObjectRef;
}
@Override
public boolean isNull() {
return value == null;
}
@Override
public boolean isNumber() {
return value instanceof Number;
}
@Override
public boolean isString() {
return value instanceof String;
}
@Override
public boolean isUndefined() {
return value == undefValue;
}
@Override
public boolean isWrappedJavaFunction() {
return value instanceof DispatchMethod;
}
@Override
public boolean isWrappedJavaObject() {
return value instanceof DispatchObject;
}
@Override
public void setBoolean(boolean val) {
value = Boolean.valueOf(val);
}
/*
* TODO(jat): remove this method
*/
@Override
public void setByte(byte val) {
value = Integer.valueOf(val);
}
/*
* TODO(jat): remove this method
*/
@Override
public void setChar(char val) {
value = Integer.valueOf(val);
}
@Override
public void setDouble(double val) {
value = Double.valueOf(val);
}
@Override
public void setInt(int val) {
value = Integer.valueOf(val);
}
public void setJavascriptObject(JsObjectRef jsObject) {
value = jsObject;
}
@Override
public void setNull() {
value = null;
}
/*
* TODO(jat): remove this method
*/
@Override
public void setShort(short val) {
value = Integer.valueOf(val);
}
@Override
public void setString(String val) {
value = val;
}
@Override
public void setUndefined() {
value = undefValue;
}
@Override
public void setValue(JsValue other) {
value = ((JsValueOOPHM) other).value;
}
/**
* Wrap a function call to a Java method in this JavaScript value.
*
* @param methodName the name of the method to invoke
* @param dispatchMethod the wrapper object
*/
public void setWrappedFunction(String methodName,
DispatchMethod dispatchMethod) {
value = dispatchMethod;
}
@Override
public <T> void setWrappedJavaObject(CompilingClassLoader cl, T val) {
if (val == null) {
setNull();
return;
}
if (val instanceof DispatchObject) {
value = val;
} else {
Map<Object, DispatchObject> cache = dispatchObjectCache.get();
if (cache == null) {
cache = new IdentityHashMap<Object, DispatchObject>();
dispatchObjectCache.set(cache);
}
DispatchObject dispObj = cache.get(val);
if (dispObj == null) {
dispObj = new DispatchObjectOOPHM(cl, val);
cache.put(val, dispObj);
}
value = dispObj;
}
}
}