/*
* 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.activiti.engine.impl.juel;
import org.activiti.engine.impl.javax.el.ELContext;
import org.activiti.engine.impl.javax.el.ELException;
import org.activiti.engine.impl.javax.el.MethodInfo;
import org.activiti.engine.impl.javax.el.MethodNotFoundException;
import org.activiti.engine.impl.javax.el.PropertyNotFoundException;
import org.activiti.engine.impl.javax.el.ValueReference;
public class AstMethod extends AstNode {
private final AstProperty property;
private final AstParameters params;
public AstMethod(AstProperty property, AstParameters params) {
this.property = property;
this.params = params;
}
public boolean isLiteralText() {
return false;
}
public Class<?> getType(Bindings bindings, ELContext context) {
return null;
}
public boolean isReadOnly(Bindings bindings, ELContext context) {
return true;
}
public void setValue(Bindings bindings, ELContext context, Object value) {
throw new ELException(LocalMessages.get("error.value.set.rvalue", getStructuralId(bindings)));
}
public MethodInfo getMethodInfo(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes) {
return null;
}
public boolean isLeftValue() {
return false;
}
public boolean isMethodInvocation() {
return true;
}
public final ValueReference getValueReference(Bindings bindings, ELContext context) {
return null;
}
@Override
public void appendStructure(StringBuilder builder, Bindings bindings) {
property.appendStructure(builder, bindings);
params.appendStructure(builder, bindings);
}
@Override
public Object eval(Bindings bindings, ELContext context) {
return invoke(bindings, context, null, null, null);
}
public Object invoke(Bindings bindings, ELContext context, Class<?> returnType, Class<?>[] paramTypes, Object[] paramValues) {
Object base = property.getPrefix().eval(bindings, context);
if (base == null) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.base.null", property.getPrefix()));
}
Object method = property.getProperty(bindings, context);
if (method == null) {
throw new PropertyNotFoundException(LocalMessages.get("error.property.method.notfound", "null", base));
}
String name = bindings.convert(method, String.class);
paramValues = params.eval(bindings, context);
context.setPropertyResolved(false);
Object result = context.getELResolver().invoke(context, base, name, paramTypes, paramValues);
if (!context.isPropertyResolved()) {
throw new MethodNotFoundException(LocalMessages.get("error.property.method.notfound", name, base.getClass()));
}
// if (returnType != null && !returnType.isInstance(result)) { // should we check returnType for method invocations?
// throw new MethodNotFoundException(LocalMessages.get("error.property.method.notfound", name, base.getClass()));
// }
return result;
}
public int getCardinality() {
return 2;
}
public Node getChild(int i) {
return i == 0 ? property : i == 1 ? params : null;
}
@Override
public String toString() {
return "<method>";
}
}