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The private implementation classes of the Apache MyFaces Core JSF-2.0 Implementation
There is a newer version: 4.1.0-RC2
/*
 * 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.view.facelets.compiler;

import java.io.IOException;
import java.io.Writer;

import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.component.UniqueIdVendor;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletException;

import org.apache.myfaces.view.facelets.AbstractFaceletContext;
import org.apache.myfaces.view.facelets.FaceletCompositionContext;
import org.apache.myfaces.view.facelets.el.ELText;
import org.apache.myfaces.view.facelets.tag.jsf.ComponentSupport;
import org.apache.myfaces.view.facelets.util.FastWriter;

/**
 * @author Jacob Hookom
 * @version $Id: UITextHandler.java,v 1.10 2008/07/13 19:01:33 rlubke Exp $
 */
final class UITextHandler extends AbstractUIHandler
{

    private final ELText txt;

    private final String alias;

    private final int length;

    public UITextHandler(String alias, ELText txt)
    {
        this.alias = alias;
        this.txt = txt;
        this.length = txt.toString().length();
    }

    public void apply(FaceletContext ctx, UIComponent parent) throws IOException, FacesException, FaceletException,
            ELException
    {
        if (parent != null)
        {
            try
            {
                ELText nt = this.txt.apply(ctx.getExpressionFactory(), ctx);
                UIComponent c = new UIText(this.alias, nt);
                //c.setId(ComponentSupport.getViewRoot(ctx, parent).createUniqueId());

                UniqueIdVendor uniqueIdVendor = FaceletCompositionContext.getCurrentInstance(ctx).getUniqueIdVendorFromStack();
                if (uniqueIdVendor == null)
                {
                    uniqueIdVendor = ComponentSupport.getViewRoot(ctx, parent);
                }
                if (uniqueIdVendor != null)
                {
                    // UIViewRoot implements UniqueIdVendor, so there is no need to cast to UIViewRoot
                    // and call createUniqueId()
                    String uid = uniqueIdVendor.createUniqueId(ctx.getFacesContext(), null);
                    c.setId(uid);
                }
                this.addComponent(ctx, parent, c);
            }
            catch (Exception e)
            {
                throw new ELException(this.alias + ": " + e.getMessage(), e.getCause());
            }
        }
    }

    public String toString()
    {
        return this.txt.toString();
    }

    public String getText()
    {
        return this.txt.toString();
    }

    public String getText(FaceletContext ctx)
    {
        Writer writer = new FastWriter(this.length);
        try
        {
            this.txt.apply(ctx.getExpressionFactory(), ctx).write(writer, ctx);
        }
        catch (IOException e)
        {
            throw new ELException(this.alias + ": " + e.getMessage(), e.getCause());
        }
        return writer.toString();
    }
}