org.zodiac.template.velocity.impl.parser.SimpleNodeUtil Maven / Gradle / Ivy

Go to download
package org.zodiac.template.velocity.impl.parser;

import java.lang.reflect.Field;

import org.apache.velocity.runtime.parser.node.Node;
import org.apache.velocity.runtime.parser.node.SimpleNode;

public abstract class SimpleNodeUtil {

    private SimpleNodeUtil() {
        super();
    }

    private static final Field CHILDREN_FIELD;

    static {
        try {
            CHILDREN_FIELD = SimpleNode.class.getDeclaredField("children");
            CHILDREN_FIELD.setAccessible(true);
        } catch (Exception e) {
            throw new RuntimeException("Could not reflect on SimpleNode", e);
        }
    }

    public static void jjtSetChild(SimpleNode parent, Node child, int index) {
        Node[] children;

        try {
            children = (Node[])CHILDREN_FIELD.get(parent);
        } catch (Exception e) {
            throw new IllegalArgumentException("Could not get children for node", e);
        }

        children[index] = child;
    }

    public static Node[] jjtGetChildren(SimpleNode parent) {
        Node[] children;

        try {
            children = (Node[])CHILDREN_FIELD.get(parent);
        } catch (Exception e) {
            throw new IllegalArgumentException("Could not get children for node", e);
        }

        return children;
    }
}