/*
    * 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.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();
          txt.writeText(out, context.getELContext());
      }
  
      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();
      }
  }