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/*
* ParameterSupport.java
*
* Created on December 07, 2001
*/
package com.sun.jdo.spi.persistence.support.ejb.ejbqlc;
import java.lang.reflect.Method;
import java.util.ResourceBundle;
import com.sun.jdo.spi.persistence.utility.I18NHelper;
/**
* Helper class to handle EJBQL query parameters.
*
* @author Michael Bouschen
* @author Shing Wai Chan
*/
public class ParameterSupport
{
/** The types of the parameters of the finder/selector method. */
private Class[] parameterTypes;
/**
* The EJB names corresponding to types of parameters of the
* finder/selector method.
*/
private String[] parameterEjbNames;
/** I18N support. */
protected final static ResourceBundle msgs = I18NHelper.loadBundle(
ParameterSupport.class);
/**
* Constructor.
* @param method the Method instance of the finder/selector method.
*/
public ParameterSupport(Method method)
{
this.parameterTypes =
(method == null) ? new Class[0] : method.getParameterTypes();
this.parameterEjbNames = new String[this.parameterTypes.length];
}
/**
* Returns type of the EJBQL parameter by input parameter declaration
* string. The specified string denotes a parameter application in EJBQL.
* It has the form "?<number>" where <number> is the parameter number
* starting with 1.
* @return class instance representing the parameter type.
*/
public Class getParameterType(String ejbqlParamDecl)
{
return getParameterType(getParamNumber(ejbqlParamDecl));
}
/**
* Returns the type of the EJBQL parameter by number.
* Note, the numbering of EJBQL parameters starts with 1,
* so the method expects 1 as the number of the first parameter.
* @return class instance representing the parameter type.
*/
public Class getParameterType(int paramNumber)
{
// InputParams are numbered starting at 1, so adjust for
// array indexing.
return parameterTypes[paramNumber - 1];
}
/**
* Get EJB name corresponding to the EJBQL parameter by input
* parameter declaration string.
* @param ejbqlParamDecl denotes a parameter application in EJBQL.
* It has the form "?<number>" where <number> is the parameter number
* starting with 1.
* @return class instance representing the parameter type.
*/
public String getParameterEjbName(String ejbqlParamDecl)
{
return getParameterEjbName(getParamNumber(ejbqlParamDecl));
}
/**
* Get EJB name corresponding to the EJBQL parameter number.
* @param paramNumber numbering of parameters starting with 1
* @return class instance representing the parameter type.
*/
public String getParameterEjbName(int paramNumber)
{
return parameterEjbNames[paramNumber - 1];
}
/**
* Set EJB name corresponding to the EJBQL parameter by input
* parameter declaration string.
* @param ejbqlParamDecl denotes a parameter application in EJBQL.
* It has the form "?<number>" where <number> is the parameter number
* starting with 1.
* @param ejbName
* @return class instance representing the parameter type.
*/
public void setParameterEjbName(String ejbqlParamDecl, String ejbName)
{
parameterEjbNames[getParamNumber(ejbqlParamDecl) - 1] = ejbName;
}
/**
* Get all EJB names corresponding to the EJBQL parameters.
* @return class instance representing the parameter type.
*/
public String[] getParameterEjbNames()
{
return parameterEjbNames;
}
/**
* Returns the name of the corresponding JDO parameter.
* The specified string denotes a parameter application in EJBQL.
* It has the form "?<number>" where <number> is the parameter number
* starting with 1.
* @return name of JDOQL parameter
*/
public String getParameterName(String ejbqlParamDecl)
{
return getParameterName(getParamNumber(ejbqlParamDecl));
}
/**
* Returns the name of the corresponding JDO parameter by parameter number.
* @return name of JDOQL parameter
*/
public String getParameterName(int paramNumber)
{
return "_jdoParam" + String.valueOf(paramNumber);
}
/**
* Returns the number of parameters.
* @return parameter count.
*/
public int getParameterCount()
{
return parameterTypes.length;
}
// Internal methods
/**
* Internal method to extract the number from a parameter application
* in EJBQL.
*/
private int getParamNumber(String ejbqlParamDecl)
{
int paramNum = 0;
try {
paramNum = Integer.parseInt(ejbqlParamDecl.substring(1));
} catch(Exception ex) {
ErrorMsg.error(I18NHelper.getMessage(
msgs, "EXC_InvalidParameterIndex", //NOI18N
ejbqlParamDecl, String.valueOf(parameterTypes.length)));
}
if (paramNum < 1 || paramNum > parameterTypes.length) {
ErrorMsg.error(I18NHelper.getMessage(
msgs, "EXC_InvalidParameterIndex", //NOI18N
ejbqlParamDecl, String.valueOf(parameterTypes.length)));
}
return paramNum;
}
}
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