/*
* 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 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.ValueReference;
public abstract class AstProperty extends AstNode {
protected final AstNode prefix;
protected final boolean lvalue;
protected final boolean strict; // allow null as property value?
public AstProperty(AstNode prefix, boolean lvalue, boolean strict) {
this.prefix = prefix;
this.lvalue = lvalue;
this.strict = strict;
}
protected abstract Object getProperty(Bindings bindings, ELContext context) throws ELException;
protected AstNode getPrefix() {
return prefix;
}
public ValueReference getValueReference(Bindings bindings, ELContext context) {
return new ValueReference(prefix.eval(bindings, context), getProperty(bindings, context));
}
@Override
public Object eval(Bindings bindings, ELContext context) {
Object base = prefix.eval(bindings, context);
if (base == null) {
return null;
}
Object property = getProperty(bindings, context);
if (property == null && strict) {
return null;
}
context.setPropertyResolved(false);
Object result = context.getELResolver().getValue(context, base, property);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.property.notfound", property, base));
}
return result;
}
public final boolean isLiteralText() {
return false;
}
public final boolean isLeftValue() {
return lvalue;
}
public boolean isMethodInvocation() {
return false;
}
public Class<?> getType(Bindings bindings, ELContext context) {
if (!lvalue) {
return null;
}
Object base = prefix.eval(bindings, context);
if (base == null) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.base.null", prefix));
}
Object property = getProperty(bindings, context);
if (property == null && strict) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.property.notfound", "null", base));
}
context.setPropertyResolved(false);
Class<?> result = context.getELResolver().getType(context, base, property);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.property.notfound", property, base));
}
return result;
}
public boolean isReadOnly(Bindings bindings, ELContext context) throws ELException {
if (!lvalue) {
return true;
}
Object base = prefix.eval(bindings, context);
if (base == null) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.base.null", prefix));
}
Object property = getProperty(bindings, context);
if (property == null && strict) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.property.notfound", "null", base));
}
context.setPropertyResolved(false);
boolean result = context.getELResolver().isReadOnly(context, base, property);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.property.notfound", property, base));
}
return result;
}
public void setValue(Bindings bindings, ELContext context, Object value) throws ELException {
if (!lvalue) {
throw new ELException(LocalMessages.get("error.value.set.rvalue", getStructuralId(bindings)));
}
Object base = prefix.eval(bindings, context);
if (base == null) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.base.null", prefix));
}
Object property = getProperty(bindings, context);
if (property == null && strict) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.property.notfound", "null", base));
}
context.setPropertyResolved(false);
context.getELResolver().setValue(context, base, property, value);
if (!context.isPropertyResolved()) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.property.notfound", property, base));
}
}
protected Method findMethod(String name, Class<?> clazz, Class<?> returnType, Class<?>[] paramTypes) {
Method method = null;
try {
method = clazz.getMethod(name, paramTypes);
} catch (NoSuchMethodException e) {
throw new MethodNotFoundException(LocalMessages.get("error.property.method.notfound", name, clazz));
}
if (returnType != null && !returnType.isAssignableFrom(method.getReturnType())) {
throw new MethodNotFoundException(LocalMessages.get("error.property.method.notfound", name, clazz));
}
return method;
}
public MethodInfo getMethodInfo(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes) {
Object base = prefix.eval(bindings, context);
if (base == null) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.base.null", prefix));
}
Object property = getProperty(bindings, context);
if (property == null && strict) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.method.notfound", "null", base));
}
String name = bindings.convert(property, String.class);
Method method = findMethod(name, base.getClass(), returnType, paramTypes);
return new MethodInfo(method.getName(), method.getReturnType(), paramTypes);
}
public Object invoke(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes, Object[] paramValues) {
Object base = prefix.eval(bindings, context);
if (base == null) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.base.null", prefix));
}
Object property = getProperty(bindings, context);
if (property == null && strict) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.method.notfound", "null", base));
}
String name = bindings.convert(property, String.class);
Method method = findMethod(name, base.getClass(), returnType, paramTypes);
try {
return method.invoke(base, paramValues);
} catch (IllegalAccessException e) {
throw new ELException(LocalMessages.get("error.property.method.access", name, base.getClass()));
} catch (IllegalArgumentException e) {
throw new ELException(LocalMessages.get("error.property.method.invocation", name, base.getClass()), e);
} catch (InvocationTargetException e) {
throw new ELException(LocalMessages.get("error.property.method.invocation", name, base.getClass()), e.getCause());
}
}
public AstNode getChild(int i) {
return i == 0 ? prefix : null;
}
}