Examples of org.apache.derby.iapi.services.compiler.MethodBuilder.pushThis()

Package org.apache.derby.iapi.services.compiler

Class org.apache.derby.iapi.services.compiler.MethodBuilder

Examples of org.apache.derby.iapi.services.compiler.MethodBuilder.pushThis()

org.apache.derby.iapi.services.compiler.MethodBuilder.pushThis()
Push this onto the stack.
```
 Stack ...  => ...,this_ref 
```

     * generates:
     *    return TypeFactory.getSQLRef(this.ROWLOCATIONSCANRESULTSET.getRowLocation());
     * and adds it to exprFun
     */


    mb.pushThis();
    mb.getField((String)null, acb.getRowLocationScanResultSetName(), ClassName.CursorResultSet);
    mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null, "getRowLocation", ClassName.RowLocation, 0);




    acb.generateDataValue(mb, getTypeCompiler(),

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    // declare field
    LocalField field = acb.newFieldDeclaration(Modifier.PRIVATE, type);


    /* Generate the call to the new method */
    mb.pushThis();
    mb.callMethod(VMOpcode.INVOKEVIRTUAL, (String) null, mbsq.getName(), type, 0);


    // generate: field = value (value is on stack)
    mb.setField(field);

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    ** the resultSet variable is cached.
    **
    **   resultSet = (resultSet == null) ? ... : resultSet
    */


    executeMethod.pushThis();
    executeMethod.getField(ClassName.BaseActivation, "resultSet", ClassName.ResultSet);
    executeMethod.conditionalIfNull();


      /* We should generate the result set here.  However, the generated
       * code size may be too big to fit in a conditional statement for

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     * generates:
     *    return TypeFactory.getSQLRef(this.ROWLOCATIONSCANRESULTSET.getRowLocation());
     * and adds it to exprFun
     */


    mb.pushThis();
    mb.getField((String)null, acb.getRowLocationScanResultSetName(), ClassName.CursorResultSet);
    mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null, "getRowLocation", ClassName.RowLocation, 0);




    acb.generateDataValue(mb, getTypeCompiler(), field);

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    MethodBuilder mb = cb.newMethodBuilder(Modifier.PUBLIC,
      ClassName.ResultSet, "execute");
    mb.addThrownException(ClassName.StandardException);


    // put a 'throwIfClosed("execute");' statement into the execute method.
    mb.pushThis(); // instance
    mb.push("execute");
    mb.callMethod(VMOpcode.INVOKEVIRTUAL, ClassName.BaseActivation, "throwIfClosed", "void", 1);


    // call this.startExecution(), so the parent class can know an execution
    // has begun.

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    mb.callMethod(VMOpcode.INVOKEVIRTUAL, ClassName.BaseActivation, "throwIfClosed", "void", 1);


    // call this.startExecution(), so the parent class can know an execution
    // has begun.


    mb.pushThis(); // instance
    mb.callMethod(VMOpcode.INVOKEVIRTUAL, ClassName.BaseActivation, "startExecution", "void", 0);


    return  mb;
  }

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  public MethodBuilder startResetMethod() {
    MethodBuilder mb = cb.newMethodBuilder(Modifier.PUBLIC,
      "void", "reset");


    mb.addThrownException(ClassName.StandardException);
    mb.pushThis();
    mb.callMethod(VMOpcode.INVOKESPECIAL, ClassName.BaseActivation, "reset", "void", 0);




    return mb;
  }

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        // get the RowLocation template
        exprFun.getField(lf); // instance for setColumn
        exprFun.push(highestColumnNumber + 1); // first arg


        exprFun.pushThis(); // instance for getRowLocationTemplate
        exprFun.push(savedItem); // first arg
        exprFun.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Activation, "getRowLocationTemplate",
                  ClassName.RowLocation, 1);


        exprFun.upCast(ClassName.DataValueDescriptor);

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        // get the RowLocation template
        exprFun.getField(lf); // instance for setColumn
        exprFun.push(highestColumnNumber + 1); // first arg


        exprFun.pushThis(); // instance for getRowLocationTemplate
        exprFun.push(savedItem); // first arg
        exprFun.callMethod(VMOpcode.INVOKEINTERFACE, ClassName.Activation, "getRowLocationTemplate",
                  ClassName.RowLocation, 1);


        exprFun.upCast(ClassName.DataValueDescriptor);

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    // declare field
    LocalField field = acb.newFieldDeclaration(Modifier.PRIVATE, type);


    /* Generate the call to the new method */
    mb.pushThis();
    mb.callMethod(VMOpcode.INVOKEVIRTUAL, (String) null, mbsq.getName(), type, 0);


    // generate: field = value (value is on stack)
    mb.setField(field);

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