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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 javax.el.ELContext;
import javax.el.ELException;
import javax.el.ExpressionFactory;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

import org.apache.myfaces.view.facelets.el.ELText;

final class TextInstruction implements Instruction
{
    private final ELText txt;

    private final String alias;

    public TextInstruction(String alias, ELText txt)
    {
        this.alias = alias;
        this.txt = txt;
    }

    public void write(FacesContext context) throws IOException
    {
        ResponseWriter out = context.getResponseWriter();
        try
        {
            txt.writeText(out, context.getELContext());
            // out.writeText(txt.toString(elContext), null);
        }
        catch (ELException e)
        {
            throw new ELException(this.alias + ": " + e.getMessage(), e.getCause());
        }
        catch (Exception e)
        {
            throw new ELException(this.alias + ": " + e.getMessage(), e);
        }
    }

    public Instruction apply(ExpressionFactory factory, ELContext ctx)
    {
        ELText nt = this.txt.apply(factory, ctx);
        if (nt == this.txt)
        {
            return this;
        }

        return new TextInstruction(alias, nt);
    }

    public boolean isLiteral()
    {
        return txt.isLiteral();
    }
}