/*
* Based on JUEL 2.2.1 code, 2006-2009 Odysseus Software GmbH
*
* 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 org.camunda.bpm.engine.impl.juel;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import org.camunda.bpm.engine.impl.javax.el.ELContext;
import org.camunda.bpm.engine.impl.javax.el.ELException;
import org.camunda.bpm.engine.impl.javax.el.MethodInfo;
import org.camunda.bpm.engine.impl.javax.el.MethodNotFoundException;
import org.camunda.bpm.engine.impl.javax.el.PropertyNotFoundException;
import org.camunda.bpm.engine.impl.javax.el.ValueExpression;
import org.camunda.bpm.engine.impl.javax.el.ValueReference;
public class AstIdentifier extends AstNode implements IdentifierNode {
private final String name;
private final int index;
public AstIdentifier(String name, int index) {
this.name = name;
this.index = index;
}
public Class<?> getType(Bindings bindings, ELContext context) {
ValueExpression expression = bindings.getVariable(index);
if (expression != null) {
return expression.getType(context);
}
context.setPropertyResolved(false);
Class<?> result = context.getELResolver().getType(context, null, name);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.identifier.property.notfound", name));
}
return result;
}
public boolean isLeftValue() {
return true;
}
public boolean isMethodInvocation() {
return false;
}
public boolean isLiteralText() {
return false;
}
public ValueReference getValueReference(Bindings bindings, ELContext context) {
ValueExpression expression = bindings.getVariable(index);
if (expression != null) {
return expression.getValueReference(context);
}
return new ValueReference(null, name);
}
@Override
public Object eval(Bindings bindings, ELContext context) {
ValueExpression expression = bindings.getVariable(index);
if (expression != null) {
return expression.getValue(context);
}
context.setPropertyResolved(false);
Object result = context.getELResolver().getValue(context, null, name);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.identifier.property.notfound", name));
}
return result;
}
public void setValue(Bindings bindings, ELContext context, Object value) {
ValueExpression expression = bindings.getVariable(index);
if (expression != null) {
expression.setValue(context, value);
return;
}
context.setPropertyResolved(false);
context.getELResolver().setValue(context, null, name, value);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.identifier.property.notfound", name));
}
}
public boolean isReadOnly(Bindings bindings, ELContext context) {
ValueExpression expression = bindings.getVariable(index);
if (expression != null) {
return expression.isReadOnly(context);
}
context.setPropertyResolved(false);
boolean result = context.getELResolver().isReadOnly(context, null, name);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.identifier.property.notfound", name));
}
return result;
}
protected Method getMethod(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes) {
Object value = eval(bindings, context);
if (value == null) {
throw new MethodNotFoundException(LocalMessages.get("error.identifier.method.notfound", name));
}
if (value instanceof Method) {
Method method = (Method)value;
if (returnType != null && !returnType.isAssignableFrom(method.getReturnType())) {
throw new MethodNotFoundException(LocalMessages.get("error.identifier.method.notfound", name));
}
if (!Arrays.equals(method.getParameterTypes(), paramTypes)) {
throw new MethodNotFoundException(LocalMessages.get("error.identifier.method.notfound", name));
}
return method;
}
throw new MethodNotFoundException(LocalMessages.get("error.identifier.method.notamethod", name, value.getClass()));
}
public MethodInfo getMethodInfo(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes) {
Method method = getMethod(bindings, context, returnType, paramTypes);
return new MethodInfo(method.getName(), method.getReturnType(), paramTypes);
}
public Object invoke(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes, Object[] params) {
Method method = getMethod(bindings, context, returnType, paramTypes);
try {
return method.invoke(null, params);
} catch (IllegalAccessException e) {
throw new ELException(LocalMessages.get("error.identifier.method.access", name));
} catch (IllegalArgumentException e) {
throw new ELException(LocalMessages.get("error.identifier.method.invocation", name, e));
} catch (InvocationTargetException e) {
throw new ELException(LocalMessages.get("error.identifier.method.invocation", name, e.getCause()));
}
}
@Override
public String toString() {
return name;
}
@Override
public void appendStructure(StringBuilder b, Bindings bindings) {
b.append(bindings != null && bindings.isVariableBound(index) ? "<var>" : name);
}
public int getIndex() {
return index;
}
public String getName() {
return name;
}
public int getCardinality() {
return 0;
}
public AstNode getChild(int i) {
return null;
}
}