jstlcoreforeach.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 708 行 · 第 1/2 页

      throw error(L.l("required attribute 'end' missing from <{0}>",
                      getTagName()));

    int uniqueId = _gen.uniqueId();

    String oldVar = "_jsp_oldVar_" + uniqueId;
    String oldStatusVar = "_jsp_status_" + uniqueId;
    
    if (_tagVar != null) {
      out.println(_tagVar + " = _jsp_state.get" + _tagVar
		  + "(pageContext, _jsp_parent_tag);");
    }

    String beginVar = "_jsp_begin_" + uniqueId;
    String endVar = "_jsp_end_" + uniqueId;
    String iVar = "_jsp_i_" + uniqueId;
    
    out.print("int " + beginVar + " = ");
    if (_beginAttr != null)
      out.print(_beginAttr.generateValue(int.class));
    else
      out.print(generateValue(int.class, _begin));
    out.println(";");

    out.print("int " + endVar + " = ");
    if (_endAttr != null)
      out.print(_endAttr.generateValue(int.class));
    else
      out.print(generateValue(int.class, _end));
    out.println(";");
    
    String stepVar = null;
    if (_step != null || _stepAttr != null) {
      stepVar = "_jsp_step_" + uniqueId;
      out.print("int " + stepVar + " = ");
      
      if (_stepAttr != null)
	out.print(_stepAttr.generateValue(int.class));
      else
	out.print(generateValue(int.class, _step));
      
      out.println(";");
    }
    else
      stepVar = "1";

    if (_tagVar != null)
      out.println(_tagVar + ".init(" + beginVar + ", " + endVar + ", " + stepVar + ");");

    if (_varStatus != null) {
      out.print("Object " + oldStatusVar + " = pageContext.putAttribute(\"");
      out.print(escapeJavaString(_varStatus));
      out.println("\", " + _tagVar + ");");
    }

    /* 
    if (_var != null) {
      out.print("Object " + oldVar + " = pageContext.getAttribute(\"");
      out.print(escapeJavaString(_var));
      out.println("\");");
    }
    */

    out.print("for (int " + iVar + " = " + beginVar + "; ");
    out.print(iVar + " <= " + endVar + "; ");
    out.println(iVar + " += " + stepVar + ") {");
    out.pushDepth();

    if (_var != null) {
      out.print("pageContext.setAttribute(\"" + escapeJavaString(_var) + "\"");
      out.println(", new Integer(" +  iVar + "));");
    }

    if (_tagVar != null) {
      out.println(_tagVar + ".setCurrent(" + iVar + ");");
    }

    generateChildren(out);
    
    out.popDepth();
    out.println("}");

    if (_var != null) {
      out.print("pageContext.removeAttribute(\"");
      out.print(escapeJavaString(_var));
      out.println("\");");
      
      /*
      out.print("pageContext.pageSetOrRemove(\"");
      out.print(escapeJavaString(_var));
      out.println("\", " + oldVar + ");");
      */
    }

    if (_varStatus != null) {
      out.print("pageContext.removeAttribute(\"");
      out.print(escapeJavaString(_varStatus));
      out.println("\");");
      
      /*
      out.print("pageContext.pageSetOrRemove(\"");
      out.print(escapeJavaString(_varStatus));
      out.println("\", " + oldStatusVar + ");");
      */
    }
  }

  
  /**
   * Generates the code for the c:forEach tag.
   */
  public void generateCollectionForEach(JspJavaWriter out)
    throws Exception
  {
    int uniqueId = _gen.uniqueId();

    String oldVar = "_jsp_oldVar_" + uniqueId;
    String oldStatusVar = "_jsp_status_" + uniqueId;
    
    if (_tagVar != null) {
      out.println(_tagVar + " = _jsp_state.get" + _tagVar
		  + "(pageContext, _jsp_parent_tag);");
    }

    String itemsVar = "_jsp_items_" + uniqueId;

    out.print("java.lang.Object " + itemsVar + " = ");
    if (_itemsAttr != null)
      out.print(_itemsAttr.generateValue(Object.class));
    else
      out.print(generateValue(Object.class, _items));
    out.println(";");

    String mapperVar = "_jsp_vm_" + uniqueId;
    String deferredValue = null;

    if (_items != null && _items.contains("#{")) {
      deferredValue = "_caucho_value_expr_" + _gen.addValueExpr(_items, "");
    }

    if (deferredValue != null && _var != null) {
      out.print("javax.el.ValueExpression " + mapperVar
                  + " = _jsp_env.getVariableMapper().resolveVariable(\"");
      out.print(escapeJavaString(_var));
      out.println("\");");
    }
    
    String iterVar = "_jsp_iter_" + uniqueId;
    String iVar = "_jsp_i_" + uniqueId;
    out.println("java.util.Iterator " + iterVar
                + " = com.caucho.jstl.rt.CoreForEachTag.getIterator("
                + itemsVar + ");");

    String beginVar = null;
    if (_beginAttr != null || _begin != null) {
      beginVar = "_jsp_begin_" + uniqueId;
      out.print("int " + beginVar + " = ");
      if (_beginAttr != null)
	out.print(_beginAttr.generateValue(int.class));
      else
	out.print(generateValue(int.class, _begin));
      out.println(";");
    }

    String intVar = "_jsp_int_" + uniqueId;
    if (beginVar != null) {
      out.print("for (int " + intVar + " = " + beginVar + ";");
      out.println(intVar + " > 0; " + intVar + "--)");
      out.println("  if (" + iterVar + ".hasNext()) " + iterVar + ".next();");
    }

    String endVar = null;
    if (_endAttr != null || _end != null) {
      endVar = "_jsp_end_" + uniqueId;
      
      out.print("int " + endVar + " = ");
      if (_endAttr != null)
	out.print(_endAttr.generateValue(int.class));
      else
	out.print(generateValue(int.class, _end));
      out.println(";");
    }
    
    String stepVar = null;
    if (_step != null || _stepAttr != null) {
      stepVar = "_jsp_step_" + uniqueId;
      out.print("int " + stepVar + " = ");
      
      if (_stepAttr != null)
	out.print(_stepAttr.generateValue(int.class));
      else
	out.print(generateValue(int.class, _step));
      
      out.println(";");
    }
    else
      stepVar = "1";

    if (_tagVar != null) {
      out.print(_tagVar + ".init(");
      if (beginVar != null)
	out.print(beginVar + ", ");
      else
	out.print("0, ");
      
      if (endVar != null)
	out.print(endVar + ", ");
      else
	out.print("Integer.MAX_VALUE, ");

      out.println(stepVar + ");");
    }

    if (_varStatus != null) {
      out.print("Object " + oldStatusVar + " = pageContext.putAttribute(\"");
      out.print(escapeJavaString(_varStatus));
      out.println("\", " + _tagVar + ");");
    }

    /*
    if (_var != null) {
      out.print("Object " + oldVar + " = pageContext.getAttribute(\"");
      out.print(escapeJavaString(_var));
      out.println("\");");
    }
    */

    if (endVar != null) {
      String begin = beginVar == null ? "0" : beginVar;
      
      out.print("for (int " + intVar + " = " + begin + "; ");
      out.print(intVar + " <= " + endVar);

      out.print(" && " + iterVar + ".hasNext(); ");
      
      out.println(intVar + " += " + stepVar + ") {");
    }
    else
      out.println("while (" + iterVar + ".hasNext()) {");
    
    out.pushDepth();

    out.println("Object " + iVar + " = " + iterVar + ".next();");

    if (_var != null) {
      out.print("pageContext.setAttribute(\"" + escapeJavaString(_var) + "\"");
      out.println(", " + iVar + ");");
    }

    if (_tagVar != null) {
      out.println(_tagVar + ".setCurrent(" + iVar + ", " + iterVar + ".hasNext());");
    }

    if (deferredValue != null && _var != null) {
      out.print("_jsp_env.getVariableMapper().setVariable(\"");
      out.print(escapeJavaString(_var));
      out.print("\", ");
      out.print("com.caucho.jstl.rt.CoreForEachTag.getExpr(");
      out.print(deferredValue + ", " + _tagVar + ".getIndex(), " + itemsVar);
      out.println("));");
    }

    generateChildren(out);

    if (! stepVar.equals("1")) {
      String stepI = "_jsp_si_" + uniqueId;

      out.print("for (int " + stepI + " = " + stepVar + "; ");
      out.println(stepI + " > 1; " + stepI + "--)");
      out.println("  if (" + iterVar + ".hasNext()) " + iterVar + ".next();");
      out.println("if (! " + iterVar + ".hasNext())");
      out.println("  break;");
    }
    
    out.popDepth();
    out.println("}");

    if (_var != null) {
      // jsp/1cmg
      out.print("pageContext.removeAttribute(\"");
      out.print(escapeJavaString(_var));
      out.println("\");");

      // restore EL variable
      if (deferredValue != null && _var != null) {
        out.print("_jsp_env.getVariableMapper().setVariable(\"");
        out.print(escapeJavaString(_var));
        out.println("\", " + mapperVar + ");");
      }
    }

    if (_varStatus != null) {
      // jsp/1cme
      out.print("pageContext.removeAttribute(\"");
      out.print(escapeJavaString(_varStatus));
      out.println("\");");
    }
  }
  
  /**
   * Generates code before the actual JSP.
   */
  @Override
  public void generateTagState(JspJavaWriter out)
    throws Exception
  {
    if (! _isDeclaration) {
      super.generateTagState(out);
      return;
    }
    
    JspNode parentTagNode = getParent().getParentTagNode();
    String tagClass;
      
    if (_items == null && _itemsAttr == null)
      tagClass = "com.caucho.jsp.IntegerLoopSupportTag";
    else
      tagClass = "com.caucho.jsp.IteratorLoopSupportTag";

    out.print("private ");
    out.print(tagClass);
    out.println(" " + _tagVar + ";");

    out.println();
    out.print("final ");
    out.print(tagClass);
    out.println(" get" + _tagVar + "(PageContext pageContext, javax.servlet.jsp.tagext.JspTag _jsp_parent_tag) throws Throwable");
    out.println("{");
    out.pushDepth();
    
    out.println("if (" + _tagVar + " == null) {");
    out.pushDepth();

    out.println(_tagVar + " = new " + tagClass + "();");
      
    if (parentTagNode == null) {
      out.println(_tagVar + ".setParent((javax.servlet.jsp.tagext.Tag) null);");
    }
    else {
      out.println(_tagVar + ".setParent(" + parentTagNode.getCustomTagName() + ");");
    }
    
    out.popDepth();
    out.println("}");
    out.println();
    out.println("return " + _tagVar + ";");
    
    out.popDepth();
    out.println("}");

    super.generateTagState(out);
  }
}