code: /*
   * 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.
   */
  /*
   * $Id$
   */
  
  package org.apache.xalan.xsltc.compiler;
  
  import org.apache.bcel.generic.ConstantPoolGen;
  import org.apache.bcel.generic.InstructionList;
  import org.apache.bcel.generic.PUSH;
  import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
  import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
  import org.apache.xalan.xsltc.compiler.util.Type;
  import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
  import org.apache.xalan.xsltc.compiler.util.Util;
  
  import org.apache.xml.serializer.ElemDesc;
  import org.apache.xml.serializer.SerializationHandler;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   * @author Morten Jorgensen
   */
  final class LiteralAttribute extends Instruction {
  
      private final String  _name;         // Attribute name (incl. prefix)
      private final AttributeValue _value; // Attribute value
  
      /**
       * Creates a new literal attribute (but does not insert it into the AST).
       * @param name the attribute name (incl. prefix) as a String.
       * @param value the attribute value.
       * @param parser the XSLT parser (wraps XPath parser).
       */
      public LiteralAttribute(String name, String value, Parser parser,
          SyntaxTreeNode parent) 
      {
  	_name = name;
          setParent(parent);
  	_value = AttributeValue.create(this, value, parser);
      }
  
      public void display(int indent) {
  	indent(indent);
  	Util.println("LiteralAttribute name=" + _name + " value=" + _value);
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  	_value.typeCheck(stable);
  	typeCheckContents(stable);
  	return Type.Void;
      }
  
      protected boolean contextDependent() {
  	return _value.contextDependent();
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  	final ConstantPoolGen cpg = classGen.getConstantPool();
  	final InstructionList il = methodGen.getInstructionList();
  
  	// push handler
  	il.append(methodGen.loadHandler());
  	// push attribute name - namespace prefix set by parent node
  	il.append(new PUSH(cpg, _name));
  	// push attribute value
  	_value.translate(classGen, methodGen);
  	
  	// Generate code that calls SerializationHandler.addUniqueAttribute()
  	// if all attributes are unique.
  	SyntaxTreeNode parent = getParent();
  	if (parent instanceof LiteralElement
  	    && ((LiteralElement)parent).allAttributesUnique()) {	    
  	    
  	    int flags = 0;
  	    boolean isHTMLAttrEmpty = false;
  	    ElemDesc elemDesc = ((LiteralElement)parent).getElemDesc();
  	    
  	    // Set the HTML flags
  	    if (elemDesc != null) {
  	    	if (elemDesc.isAttrFlagSet(_name, ElemDesc.ATTREMPTY)) {
  	    	    flags = flags | SerializationHandler.HTML_ATTREMPTY;
  	    	    isHTMLAttrEmpty = true;
  	    	}
  	    	else if (elemDesc.isAttrFlagSet(_name, ElemDesc.ATTRURL)) {
  	    	    flags = flags | SerializationHandler.HTML_ATTRURL;
  	    	}
  	    }
  	    
  	    if (_value instanceof SimpleAttributeValue) {
  	        String attrValue = ((SimpleAttributeValue)_value).toString();
  	        
  	        if (!hasBadChars(attrValue) && !isHTMLAttrEmpty) {
  	            flags = flags | SerializationHandler.NO_BAD_CHARS;
  	        }
  	    }
  	        
  	    il.append(new PUSH(cpg, flags));
  	    il.append(methodGen.uniqueAttribute());
  	}
  	else {
  	    // call attribute
  	    il.append(methodGen.attribute());
  	}
      }
      
      /**
       * Return true if at least one character in the String is considered to
       * be a "bad" character. A bad character is one whose code is:
       * less than 32 (a space),
       * or greater than 126,
       * or it is one of '<', '>', '&' or '\"'. 
       * This helps the serializer to decide whether the String needs to be escaped.
       */
      private boolean hasBadChars(String value) {
      	char[] chars = value.toCharArray();
      	int size = chars.length;
      	for (int i = 0; i < size; i++) {
      	    char ch = chars[i];
      	    if (ch < 32 || 126 < ch || ch == '<' || ch == '>' || ch == '&' || ch == '\"')
                  return true;    	        
      	}
      	return false;
      }
      
      /**
       * Return the name of the attribute
       */
      public String getName() {
          return _name;
      }
      
      /**
       * Return the value of the attribute
       */
      public AttributeValue getValue() {
          return _value;
      }
      
  }
  