org.apache.cayenne.velocity.BindNotEqualDirective Maven / Gradle / Ivy

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package org.apache.cayenne.velocity;

import java.io.IOException;
import java.io.Writer;

import org.apache.cayenne.access.translator.ParameterBinding;
import org.apache.velocity.context.InternalContextAdapter;

/**
 * A custom Velocity directive to create a PreparedStatement parameter text for "<>?".
 * If null value is encountered, generated text will look like "IS NOT NULL". Usage in
 * Velocity template is "WHERE SOME_COLUMN #bindNotEqual($xyz)".
 * 
 * @since 1.1
 */
public class BindNotEqualDirective extends BindDirective {

    @Override
    public String getName() {
        return "bindNotEqual";
    }

    @Override
    protected void render(
            InternalContextAdapter context,
            Writer writer,
            ParameterBinding binding) throws IOException {

        if (binding.getValue() != null) {
            bind(context, binding);
            writer.write("<> ?");
        }
        else {
            writer.write("IS NOT NULL");
        }
    }
}