com.rivescript.lang.Java Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of rivescript-core Show documentation
RiveScript interpreter for Java
There is a newer version: 0.11.0
/*
 * Copyright (c) 2016 the original author or authors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.rivescript.lang;

import com.rivescript.RiveScript;
import com.rivescript.macro.ObjectHandler;
import com.rivescript.macro.Subroutine;

import java.util.HashMap;

import static java.util.Objects.requireNonNull;

/**
 * Java programming language support for RiveScript-Java.
 * 
 * Note that since Java must be compiled before running, this object macro language is only
 * available at compile-time using the {@link RiveScript#setSubroutine(String, Subroutine)} method.
 * Inline Java code can't be parsed and compiled from RiveScript source files.
 *
 * @author Noah Petherbridge
 * @author Marcel Overdijk
 * @see ObjectHandler
 */
public class Java implements ObjectHandler {

	private RiveScript rs;
	private HashMap handlers;

	/**
	 * Constructs a Java {@link ObjectHandler}.
	 *
	 * @param rs The RiveScript instance, not null.
	 */
	public Java(RiveScript rs) {
		this.rs = requireNonNull(rs, "'rs' must not be null");
		this.handlers = new HashMap<>();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void load(String name, String[] code) {
		System.err.println("NOTICE: Can't dynamically eval Java code from an inline object macro! "
				+ "Use the setSubroutine() function instead to define an object at compile time.");
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String call(String name, String[] fields) {
		// Does the object macro exist?
		Subroutine subroutine = this.handlers.get(name);
		if (subroutine == null) {
			return "[ERR: Object Not Found]";
		}

		// Call it!
		return subroutine.call(this.rs, fields);
	}
}