org.apache.cayenne.velocity.BindObjectNotEqualDirective 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 set of SQL conditions to check unequality of an
 * ObjectId of an object. Usage in Velocity template is "WHERE
 * #bindObjectNotEqual($object)" or "WHERE #bindObjectNotEqual($object $columns
 * $idValues)".
 * 
 * @since 3.0
 */
public class BindObjectNotEqualDirective extends BindObjectEqualDirective {

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

    @Override
    protected void renderColumn(
            InternalContextAdapter context,
            Writer writer,
            Object columnName,
            int columnIndex) throws IOException {

        if (columnIndex > 0) {
            writer.write(" OR ");
        }

        writer.write(columnName.toString());
    }

    @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");
        }
    }
}