How to Write Your Own Template
Here are the steps that I used to create my own template which generates a spring RowMapper for a JdbcDaoSupport class.
Start with exporting templates using menu Fast Code | Templates | Export Templates:
Choosing templates-config.xml (or all) creates a new project in my workspace:
<template type="Create Spring Detail Mapper">
<description></description>
<variation></variation>
<class-pattern></class-pattern>
<getter-setter>getter-setter</getter-setter>
<allowed-file-extensions>java</allowed-file-extensions>
<number-required-classes>1</number-required-classes>
<allow-multiple-variation>false</allow-multiple-variation>
<template-body>
<![CDATA[
private class ${class_name}Mapper implements RowMapper <${class_name}>{
public ${class_name} mapRow(ResultSet rs, int line) throws SQLException {
${class_name} inst = new ${class_name}();
#foreach ($field in ${fields})
#if (${field.type.endsWith("String")})
inst.${field.setter}(rs.getString(""));
#else
inst.${field.setter}(rs.getInt("")); // type not String, assume int
#end
#end
return inst;
}
}
]]>
</template-body>
</template>
To test the result I import the template back into fast code using menu Fast Code | Templates | Import Templates, then open up a java class that needs the mapper and execute the template using menu Fast Code | Templates | Create New Snippet. Pick my template, class, fields and presto: private class ContactBeanMapper implements RowMapper<ContactBean> {
public ContactBean mapRow(ResultSet rs, int line) throws SQLException {
ContactBean inst = new ContactBean();
inst.setName(rs.getString(""));
inst.setPhone(rs.getString(""));
return inst;
}
}
This may not seem like a big deal because I only have two fields in class ContactBean. It really pays off when I have a dozen or more fields.I did find a few quirks with the plugin - it looks like the custom templates need to be reloaded every time eclipse is restarted, and the import/export mechanism seems to make a service call to localhost so make sure that the eclipse network proxy preference is configured correctly.
In short - I can create a new template whenever I want to generate some code or configuration file based on the definition of a java class. In another blog post, I use it to generate a javascript clone of a java bean.
