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package org.zodiac.template.velocity.impl;

import org.apache.velocity.runtime.parser.node.AbstractExecutor;
import org.apache.velocity.runtime.parser.node.BooleanPropertyExecutor;
import org.apache.velocity.runtime.parser.node.GetExecutor;
import org.apache.velocity.runtime.parser.node.MapGetExecutor;
import org.apache.velocity.runtime.parser.node.PropertyExecutor;
import org.apache.velocity.util.introspection.Info;
import org.apache.velocity.util.introspection.VelPropertyGet;

/**
 * 
 * 修改velocity默认的uberspect，改变默认的get property方法的顺序：
 * 
 * getFoo()或getfoo()。
 * isFoo()或isfoo()。
 * Map.get(String)。
 * AnyType.get(String)。
 * 
 * 
 *
 */
public class CustomizedUberspectImpl extends org.apache.velocity.util.introspection.UberspectImpl {

    public CustomizedUberspectImpl() {
        super();
    }

    @Override
    public VelPropertyGet getPropertyGet(Object obj, String identifier, Info i) {
        if (obj == null) {
            return null;
        }

        Class claz = obj.getClass();

        /*
         * First try for a getFoo() type of property (also getfoo() ) .
         */
        AbstractExecutor executor = new PropertyExecutor(log, introspector, claz, identifier);

        /*
         * If that didn't work, look for boolean isFoo() .
         */
        if (!executor.isAlive()) {
            executor = new BooleanPropertyExecutor(log, introspector, claz, identifier);
        }

        /*
         * Let's see if we are a map.
         */
        if (!executor.isAlive()) {
            executor = new MapGetExecutor(log, claz, identifier);
        }

        /*
         * Finally, look for get("foo") .
         */
        if (!executor.isAlive()) {
            executor = new GetExecutor(log, introspector, claz, identifier);
        }

        return executor.isAlive() ? new VelGetterImpl(executor) : null;
    }
}