/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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.apache.shale.test.mock;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.faces.application.Application;
import javax.faces.component.StateHolder;
import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.MethodBinding;
import javax.faces.el.MethodNotFoundException;
import javax.faces.el.ReferenceSyntaxException;
import javax.faces.el.ValueBinding;
/**
* <p>Mock implementation of <code>MethodBinding</code>.</p>
*
* <p>This implementation is subject to the following restrictions:</p>
* <ul>
* <li>The portion of the method reference expression before the final
* "." must conform to the limitations of {@link MockValueBinding}.</li>
* <li>The name of the method to be executed cannot be delimited by "[]".</li>
* </ul>
*/
public class MockMethodBinding extends MethodBinding implements StateHolder {
// ------------------------------------------------------------ Constructors
/**
* <p>Construct a default instance.</p>
*/
public MockMethodBinding() {
}
/**
* <p>Construct a configured instance.</p>
*
* @param application Application instance for this application
* @param ref Method binding expression to be parsed
* @param args Signature of this method
*/
public MockMethodBinding(Application application, String ref,
Class[] args) {
this.application = application;
this.args = args;
if (ref.startsWith("#{") && ref.endsWith("}")) {
ref = ref.substring(2, ref.length() - 1);
}
this.ref = ref;
int period = ref.lastIndexOf(".");
if (period < 0) {
throw new ReferenceSyntaxException(ref);
}
vb = application.createValueBinding(ref.substring(0, period));
name = ref.substring(period + 1);
if (name.length() < 1) {
throw new ReferenceSyntaxException(ref);
}
}
// ------------------------------------------------------ Instance Variables
private Application application;
private Class args[];
private String name;
private String ref;
private ValueBinding vb;
// --------------------------------------------------- MethodBinding Methods
/** {@inheritDoc} */
public Object invoke(FacesContext context, Object[] params)
throws EvaluationException, MethodNotFoundException {
if (context == null) {
throw new NullPointerException();
}
Object base = vb.getValue(context);
if (base == null) {
throw new EvaluationException("Cannot find object via expression \""
+ vb.getExpressionString() + "\"");
}
Method method = method(base);
try {
return (method.invoke(base, params));
} catch (IllegalAccessException e) {
throw new EvaluationException(e);
} catch (InvocationTargetException e) {
throw new EvaluationException(e.getTargetException());
}
}
/** {@inheritDoc} */
public Class getType(FacesContext context) {
Object base = vb.getValue(context);
Method method = method(base);
Class returnType = method.getReturnType();
if ("void".equals(returnType.getName())) {
return (null);
} else {
return (returnType);
}
}
/** {@inheritDoc} */
public String getExpressionString() {
return "#{" + ref + "}";
}
// ----------------------------------------------------- StateHolder Methods
/** {@inheritDoc} */
public Object saveState(FacesContext context) {
Object values[] = new Object[4];
values[0] = name;
values[1] = ref;
values[2] = UIComponentBase.saveAttachedState(context, vb);
values[3] = args;
return (values);
}
/** {@inheritDoc} */
public void restoreState(FacesContext context, Object state) {
Object values[] = (Object[]) state;
name = (String) values[0];
ref = (String) values[1];
vb = (ValueBinding) UIComponentBase.restoreAttachedState(context,
values[2]);
args = (Class []) values[3];
}
/**
* <p>Flag indicating this is a transient instance.</p>
*/
private boolean transientFlag = false;
/** {@inheritDoc} */
public boolean isTransient() {
return (this.transientFlag);
}
/** {@inheritDoc} */
public void setTransient(boolean transientFlag) {
this.transientFlag = transientFlag;
}
/** {@inheritDoc} */
public int hashCode() {
if (ref == null) {
return 0;
} else {
return ref.hashCode();
}
}
/** {@inheritDoc} */
public boolean equals(Object otherObj) {
MockMethodBinding other = null;
if (!(otherObj instanceof MockMethodBinding)) {
return false;
}
other = (MockMethodBinding) otherObj;
// test object reference equality
if (this.ref != other.ref) {
// test object equality
if (null != this.ref && null != other.ref) {
if (!this.ref.equals(other.ref)) {
return false;
}
}
return false;
}
// no need to test name, since it flows from ref.
// test our args array
if (this.args != other.args) {
if (this.args.length != other.args.length) {
return false;
}
for (int i = 0, len = this.args.length; i < len; i++) {
if (this.args[i] != other.args[i]) {
if (!this.ref.equals(other.ref)) {
return false;
}
}
}
}
return true;
}
// --------------------------------------------------------- Private Methods
/**
* <p>Return the <code>Method</code> to be called.</p>
*
* @param base Base object from which to extract the method reference
*/
Method method(Object base) {
Class clazz = base.getClass();
try {
return (clazz.getMethod(name, args));
} catch (NoSuchMethodException e) {
throw new MethodNotFoundException(ref + ": " + e.getMessage());
}
}
}