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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF1.2 features. A JSF1.2 implementation is required to use this version of the Tomahawk library.

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/*
 * 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.myfaces.component;

import javax.el.ELException;
import javax.el.MethodExpression;
import javax.faces.component.StateHolder;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.MethodBinding;
import javax.faces.el.MethodNotFoundException;

/**
 * Converts a MethodExpression to a MethodBinding.  
 * See JSF 1.2 spec section 5.8.4
 *
 * ATTENTION: If you make changes to this class, treat 
 * org.apache.myfaces.el.convert.MethodExpressionToMethodBinding
 * accordingly.
 * 
 * This class could be moved or changed in the future
 * 
 * @since 1.1.7
 * @author Stan Silvert
 * @see org.apache.myfaces.el.convert.MethodExpressionToMethodBinding
 */
public class MethodExpressionToMethodBinding extends MethodBinding implements StateHolder {
    
    private MethodExpression methodExpression;
    
    private boolean isTransient = false;
    
    public MethodExpressionToMethodBinding() {
        methodExpression = null;
    }

    /** Creates a new instance of MethodExpressionToMethodBinding */
    public MethodExpressionToMethodBinding(MethodExpression methodExpression) {
        this.methodExpression = methodExpression;
    }
    
    @Override
    public String getExpressionString()
    {
        return methodExpression.getExpressionString();
    }

    public Class getType(FacesContext facesContext) 
        throws MethodNotFoundException {
        
        try {
            return methodExpression.getMethodInfo(facesContext.getELContext()).getReturnType();
        } catch (javax.el.MethodNotFoundException e) {
            throw new javax.faces.el.MethodNotFoundException(e);
        } catch (ELException e) {
            throw new EvaluationException(e);
        }
    }

    public Object invoke(FacesContext facesContext, Object[] params) 
        throws EvaluationException, MethodNotFoundException {
        
        try {
            return methodExpression.invoke(facesContext.getELContext(), params);
        } catch (javax.el.MethodNotFoundException e) {
            throw new javax.faces.el.MethodNotFoundException(e);
        } catch (ELException e) {
            throw new EvaluationException(e);
        }
    }

// -------- StateHolder methods -------------------------------------------    
    
    public void restoreState(FacesContext context, Object state) {
        if(state != null)
            methodExpression = (MethodExpression)state;
    }

    public Object saveState(FacesContext context) {
        if(!isTransient)
            return methodExpression;
        return null;
    }

    public void setTransient(boolean newTransientValue) {
        isTransient = newTransientValue;
    }

    public boolean isTransient() {
        return isTransient;
    }
    
}