/*
 * 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 javax.faces.component;

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.MethodBinding;
import javax.faces.el.ValueBinding;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;

/**
 * A collection of static helper methods for component-related issues.
 * 
 * @author Manfred Geiler (latest modification by $Author$)
 * @version $Revision$ $Date$
 */
class _ComponentUtils
{
    private _ComponentUtils() {}

    static void callValidators(FacesContext context, UIInput input, Object convertedValue)
    {
        // first invoke the list of validator components
        Validator[] validators = input.getValidators();
        for (int i = 0; i < validators.length; i++)
        {
            Validator validator = validators[i];
            try
            {
                validator.validate(context, input, convertedValue);
            }
            catch (ValidatorException e)
            {
                input.setValid(false);
                FacesMessage facesMessage = e.getFacesMessage();
                if (facesMessage != null)
                {
                    facesMessage.setSeverity(FacesMessage.SEVERITY_ERROR);
                    context.addMessage(input.getClientId(context), facesMessage);
                }
            }
        }

        // now invoke the validator method defined as a method-binding attribute
        // on the component
        MethodBinding validatorBinding = input.getValidator();
        if (validatorBinding != null)
        {
            try
            {
                validatorBinding.invoke(context,
                                        new Object[] {context, input, convertedValue});
            }
            catch (EvaluationException e)
            {
                input.setValid(false);
                Throwable cause = e.getCause();
                if (cause instanceof ValidatorException)
                {
                    FacesMessage facesMessage = ((ValidatorException)cause).getFacesMessage();
                    if (facesMessage != null)
                    {
                        facesMessage.setSeverity(FacesMessage.SEVERITY_ERROR);
                        context.addMessage(input.getClientId(context), facesMessage);
                    }
                }
                else
                {
                    throw e;
                }
            }
        }
    }
    
    static String getStringValue(FacesContext context, ValueBinding vb)
    {
        Object value = vb.getValue(context);
        if(value == null)
        {
            return null;
        }
        return value.toString();
    }

    static String getPathToComponent(UIComponent component) {
        StringBuffer buf = new StringBuffer();

        if(component == null)
        {
            buf.append("{Component-Path : ");
            buf.append("[null]}");
            return buf.toString();
        }

        getPathToComponent(component,buf);

        buf.insert(0,"{Component-Path : ");
        buf.append("}");

        return buf.toString();
    }

    private static void getPathToComponent(UIComponent component, StringBuffer buf)
    {
        if(component == null)
            return;

        StringBuffer intBuf = new StringBuffer();

        intBuf.append("[Class: ");
        intBuf.append(component.getClass().getName());
        if(component instanceof UIViewRoot)
        {
            intBuf.append(",ViewId: ");
            intBuf.append(((UIViewRoot) component).getViewId());
        }
        else
        {
            intBuf.append(",Id: ");
            intBuf.append(component.getId());
        }
        intBuf.append("]");

        buf.insert(0,intBuf.toString());

        getPathToComponent(component.getParent(), buf);
    }


}