/*
 * 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.el.ValueExpression;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFComponent;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;

/**
 * Displays a value to the user.
 */
@JSFComponent(defaultRendererType = "javax.faces.Text")
public class UIOutput extends UIComponentBase implements ValueHolder
{
    public static final String COMPONENT_TYPE = "javax.faces.Output";
    public static final String COMPONENT_FAMILY = "javax.faces.Output";

    private Object _value;
    private Converter _converter;

    /**
     * Construct an instance of the UIOutput.
     */
    public UIOutput()
    {
        setRendererType("javax.faces.Text");
    }

    @Override
    public String getFamily()
    {
        return COMPONENT_FAMILY;
    }

    public Object getLocalValue()
    {
        return _value;
    }

    /**
     * Gets The initial value of this component.
     * 
     * @return the new value value
     */
    @JSFProperty
    public Object getValue()
    {
        if (_value != null)
        {
            return _value;
        }
        ValueExpression expression = getValueExpression("value");
        if (expression != null)
        {
            return expression.getValue(getFacesContext().getELContext());
        }
        return null;
    }

    /**
     * The initial value of this component.
     */
    public void setValue(Object value)
    {
        this._value = value;
    }

    /**
     * An expression that specifies the Converter for this component.
     * <p>
     * The value can either be a static value (ID) or an EL expression. When a static id is
     * specified, an instance of the converter type registered with that id is used. When this
     * is an EL expression, the result of evaluating the expression must be an object that
     * implements the Converter interface.
     * </p>
     */
    @JSFProperty(stateHolder=true)
    public Converter getConverter()
    {
        if (_converter != null)
        {
            return _converter;
        }
        ValueExpression expression = getValueExpression("converter");
        if (expression != null)
        {
            return (Converter) expression.getValue(getFacesContext().getELContext());
        }
        return null;
    }

    public void setConverter(Converter converter)
    {
        this._converter = converter;
    }

    @Override
    public Object saveState(FacesContext facesContext)
    {
        Object[] values = new Object[3];
        values[0] = super.saveState(facesContext);
        values[1] = _value;
        values[2] = saveAttachedState(facesContext, _converter);

        return values;
    }

    @Override
    public void restoreState(FacesContext facesContext, Object state)
    {
        Object[] values = (Object[]) state;
        super.restoreState(facesContext, values[0]);
        _value = values[1];
        _converter = (Converter) restoreAttachedState(facesContext, values[2]);
    }
}