generictag.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 1,024 行 · 第 1/2 页

      boolean isFragment = false;

      if (attribute != null) {
	isFragment = (attribute.isFragment()
                      || attribute.getTypeName().equals(JspFragment.class.getName()));
      }

      if (value instanceof JspAttribute
	  && ((JspAttribute) value).isJspFragment())
	isFragment = true;

      generateSetAttribute(out, name, attrName, value,
                           attribute == null || attribute.canBeRequestTime(),
			   isFragment, attribute);
    }
  }

  private TagAttributeInfo getAttributeInfo(QName attrName)
  {
    TagAttributeInfo attrs[] = _tagInfo.getAttributes();

    int j = 0;
    for (j = 0; attrs != null && j < attrs.length; j++) {
      if (isNameMatch(attrs[j].getName(), attrName))
	return attrs[j];
    }

    return null;
  }

  private int getAttributeIndex(String name)
  {
    for (int i = 0; i < _attributeNames.size(); i++) {
      QName attrName = _attributeNames.get(i);

      if (isNameMatch(name, attrName))
	return i;
    }

    return -1;
  }

  private boolean isNameMatch(String defName, QName attrName)
  {
    if (defName.equals(attrName.getName())) {
      return true;
    }
    else if (defName.equals(attrName.getLocalName()) &&
	     attrName.getPrefix().equals(getQName().getPrefix())) {
      return true;
    }
    else
      return false;
  }

  /**
   * Sets an attribute for a tag
   *
   * @param info the tag's introspected information
   * @param name the tag's Java variable name
   * @param attrName the attribute name to set
   * @param value the new value of the tag.
   */
  void generateSetAttribute(JspJavaWriter out,
                            String name, QName attrName, Object value,
                            boolean allowRtexpr, boolean isFragment,
			    TagAttributeInfo attrInfo)
    throws Exception
  {
    Method method = getAttributeMethod(attrName);

    boolean isDynamic = DynamicAttributes.class.isAssignableFrom(_tagClass);
    
    if (method != null) {
      // jsp/18cq
      if (Modifier.isStatic(method.getModifiers()))
	throw error(L.l("attribute '{0}' may not be a static method.",
			method.getName()));

      generateSetParameter(out, name, value, method,
			   allowRtexpr, "pageContext", isFragment, attrInfo);
    }
    else if (! isDynamic) {
      throw error(L.l("attribute '{0}' in tag '{1}' has no corresponding set method in tag class '{2}'",
                  attrName.getName(), getTagName(), _tagClass.getName()));
    }
    else if (isFragment) {
      String uri = attrName.getNamespaceURI();
      String local = attrName.getLocalName();

      out.print(name + ".setDynamicAttribute(");

      if (uri == null)
	out.print("null, ");
      else
	out.print("\"" + escapeJavaString(uri) + "\", ");
      
      JspFragmentNode frag = (JspFragmentNode) value;
      out.print("\"" + escapeJavaString(local) + "\", ");
      out.print(frag.generateValue());
      out.println(");");
    }
    else {
      String uri = attrName.getNamespaceURI();
      String local = attrName.getLocalName();
      
      out.print(name + ".setDynamicAttribute(");

      if (uri == null)
	out.print("null, ");
      else
	out.print("\"" + escapeJavaString(uri) + "\", ");
      
      out.print("\"" + escapeJavaString(local) + "\", ");
      out.print(generateRTValue(Object.class, value));
      out.println(");");
    }
  }

  private Method getAttributeMethod(QName attrName)
    throws Exception
  {
    Method method = null;
    
    try {
      BeanInfo info = Introspector.getBeanInfo(_tagClass);

      if (info != null)
	method = BeanUtil.getSetMethod(info, attrName.getLocalName());

      if (method != null)
	return method;
    } catch (Exception e) {
      log.log(Level.FINER, e.toString(), e);
    }

    /*
    try {
      method = BeanUtil.getSetMethod(_tagClass, attrName.getLocalName());

      if (method != null)
	return method;
    } catch (Throwable e) {
      log.log(Level.FINER, e.toString(), e);
    }
    */

    return method;
  }

  /**
   * Returns true if there is a tag variable declaration matching the scope.
   */
  protected boolean hasVarDeclaration(int scope)
    throws Exception
  {
    for (int i = 0; _varInfo != null && i < _varInfo.length; i++) {
      VariableInfo var = _varInfo[i];
      
      if (var != null && var.getScope() == scope)
	return true;
    }

    return false;
  }

  /**
   * Prints a tag variable declaration.  Only the variables matching the
   * scope will be printed.
   *
   * @param out the stream to the java code.
   * @param scope the variable scope to print
   */
  protected void printVarDeclaration(JspJavaWriter out, int scope)
    throws Exception
  {
    for (int i = 0; _varInfo != null && i < _varInfo.length; i++) {
      VariableInfo var = _varInfo[i];
      
      if (var != null) {
        printVarDeclare(out, scope, var);
        printVarAssign(out, scope, var);
      }
    }
  }

  /**
   * Prints a tag variable declaration.  Only the variables matching the
   * scope will be printed.
   *
   * @param out the stream to the java code.
   * @param scope the variable scope to print
   */
  protected void printVarDeclare(JspJavaWriter out, int scope)
    throws Exception
  {
    for (int i = 0; _varInfo != null && i < _varInfo.length; i++) {
      VariableInfo var = _varInfo[i];

      if (var != null)
        printVarDeclare(out, scope, var);
    }
  }

  /**
   * Prints a tag variable declaration.  Only the variables matching the
   * scope will be printed.
   *
   * @param out the stream to the java code.
   * @param scope the variable scope to print
   */
  protected void printVarAssign(JspJavaWriter out, int scope)
    throws Exception
  {
    for (int i = 0; _varInfo != null && i < _varInfo.length; i++) {
      VariableInfo var = _varInfo[i];

      if (var != null)
        printVarAssign(out, scope, var);
    }
  }

  /**
   * Returns the VariableInfo corresponding the to tag vars and the tag
   * data.  Mainly, this means looking up the variable names from the
   * attributes for the name-from-attribute.
   *
   * @param tagVars the implicit tag variables for the tag
   * @param tagData the parsed tag attributes
   *
   * @return an array of filled VariableInfo
   */
  protected VariableInfo []fillVariableInfo(TagVariableInfo []tagVars,
                                            TagData tagData)
    throws JspParseException
  {
    if (tagVars == null)
      return null;

    VariableInfo []vars = new VariableInfo[tagVars.length];

    for (int i = 0; i < tagVars.length; i++) {
      TagVariableInfo tagVar = tagVars[i];

      String name = null;
      if (tagVar.getNameGiven() != null)
        name = tagVar.getNameGiven();
      else {
        String attributeName = tagVar.getNameFromAttribute();

        name = tagData.getAttributeString(attributeName);

        if (name == null || "".equals(name) || "null".equals(name))
          continue;
      }

      vars[i] = new VariableInfo(name, tagVar.getClassName(),
                                 tagVar.getDeclare(), tagVar.getScope());
    }

    return vars;
  }

  /**
   * Prints a tag variable declaration.  Only the variables matching the
   * scope will be printed.
   *
   * @param out the stream to the java code.
   * @param scope the variable scope to print
   */
  protected void printVarDeclare(JspJavaWriter out,
				 int scope,
				 VariableInfo var)
    throws Exception
  {
    if (! _gen.hasScripting()
        || var == null
        || var.getVarName() == null
        || "".equals(var.getVarName())
        || "null".equals(var.getVarName()))
      return;
    
    if (var.getScope() == scope
	|| var.getScope() == VariableInfo.AT_BEGIN) {
      if (var.getVarName() == null)
        throw error(L.l("tag variable expects a name"));

      String className = var.getClassName();

      if (className == null
          || "".equals(className)
          || "null".equals(className))
	className = DEFAULT_VAR_TYPE;

      /*
      if (var.getClassName() == null)
        throw error(L.l("tag variable '{0}' expects a classname",
                        var.getVarName()));
      */

      validateVarName(var.getVarName());

      // jsp/107r
      if (var.getDeclare()
	  && var.getScope() == scope
	  && (var.getScope() == VariableInfo.NESTED && hasScripting()
	      || var.getScope() == VariableInfo.AT_BEGIN)
	  && ! varAlreadyDeclared(var.getVarName())) {
	validateClass(className, var.getVarName());
	
        out.println(className + " " + var.getVarName() + ";");
      }
    }
  }

  /**
   * Prints a tag variable declaration.  Only the variables matching the
   * scope will be printed.
   *
   * @param out the stream to the java code.
   * @param scope the variable scope to print
   */
  protected void printVarAssign(JspJavaWriter out, int scope, VariableInfo var)
    throws Exception
  {
    if ("".equals(var.getVarName())
        || "null".equals(var.getVarName()))
      return;
    
    if (var.getScope() == scope
        || var.getScope() == VariableInfo.AT_BEGIN) {
      if (var.getVarName() == null)
        throw error(L.l("tag variable expects a name"));

      String className = var.getClassName();

      if (className == null || className.equals("null"))
	className = DEFAULT_VAR_TYPE;
      
      /*
      if (var.getClassName() == null)
        throw error(L.l("tag variable '{0}' expects a classname",
                        var.getVarName()));
      */

      validateVarName(var.getVarName());

      if (! _gen.hasScripting()) {
      }
      else if (var.getScope() != VariableInfo.NESTED || hasScripting()) {
	out.setLocation(_filename, _startLine);
	out.print(var.getVarName() + " = ");
	String v = "pageContext.findAttribute(\"" + var.getVarName() + "\")";
	convertParameterValue(out, className, v);
	out.println(";");
      }

      try {
	_gen.addBeanClass(var.getVarName(), className);
      } catch (Exception e) {
	Throwable cause = e.getCause();

	if (cause == null)
	  cause = e;

	throw error(L.l("'{0}' is an unknown class for tag variable '{1}' in <{2}>",
			className, var.getVarName(), getTagInfo().getTagName()),
		    cause);
      }
    }
  }

  private void validateVarName(String name)
    throws JspParseException
  {
    if (! Character.isJavaIdentifierStart(name.charAt(0)))
      throw error(L.l("tag variable '{0}' is an illegal Java identifier.", name));

    for (int i = 0; i < name.length(); i++) {
      if (! Character.isJavaIdentifierPart(name.charAt(i)))
        throw error(L.l("tag variable '{0}' is an illegal Java identifier.", name));
    }
  }

  /**
   * Returns true if the variable has been declared.
   */
  private boolean varAlreadyDeclared(String varName)
  {
    if (_gen.isDeclared(varName))
      return true;
    
    for (JspNode node = getParent();
	 node != null;
	 node = node.getParent()) {
      if (! (node instanceof GenericTag))
        continue;
      if (node instanceof JspFragmentNode)
        break;

      GenericTag tag = (GenericTag) node;
      
      VariableInfo []varInfo = tag.getVarInfo();

      for (int i = 0; varInfo != null && i < varInfo.length; i++) {
        if (varInfo[i] == null)
          continue;
        else if (varInfo[i].getVarName().equals(varName))
          return true;
      }
    }

    return false;
  }

  /**
   * Returns true if the tag instance has been declared
   */
  protected boolean isDeclared()
  {
    if (! _gen.getRecycleTags())
      return false;

    JspNode parent = getParent();

    if (! (parent instanceof JspRoot)
	&& ! (parent instanceof JspTop)
	&& ! (parent instanceof GenericTag)
	&& ! (parent instanceof JspAttribute))
      return false;

    boolean isDeclared = false;

    ArrayList<JspNode> siblings = getParent().getChildren();
    for (int i = 0; i < siblings.size(); i++) {
      JspNode node = siblings.get(i);

      if (node == this) {
        return isDeclared;
      }

      if (hasScriptlet(node)) {
        return false;
      }

      if (node instanceof GenericTag) {
        GenericTag customTag = (GenericTag) node;

        if (customTag.getTag() == getTag())
          isDeclared = true;
      }
    }

    return isDeclared;
  }

  /**
   * Returns true if the node or one of its children is a scriptlet
   */
  protected boolean hasScriptlet(JspNode node)
  {
    if (node instanceof JspScriptlet || node instanceof JspExpression)
      return true;

    ArrayList<JspNode> children = node.getChildren();

    if (children == null)
      return false;

    for (int i = 0; i < children.size(); i++) {
      JspNode child = children.get(i);

      if (hasScriptlet(child))
	return true;
    }

    return false;
  }

  /**
   * Checks that the given class is a valid variable class.
   */
  protected void validateClass(String className, String varName)
    throws JspParseException
  {
    try {
      if (_primTypes.contains(className))
	return;
      else if (className.endsWith("[]")) {
	validateClass(className.substring(0, className.length() - 2), varName);
	return;
      }

      Class cl = _gen.getBeanClass(className);
    } catch (ClassNotFoundException e) {
      throw error(L.l("'{0}' is an unknown class for tag variable '{1}'.",
		      className, varName));
    }
  }

  static {
    _primTypes.add("boolean");
    _primTypes.add("byte");
    _primTypes.add("short");
    _primTypes.add("int");
    _primTypes.add("long");
    _primTypes.add("float");
    _primTypes.add("double");
    _primTypes.add("char");
  }
}