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/**
 * Copyright (c) 2011-2021, James Zhan 詹波 ([email protected]).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jfinal.template.stat;

/**
 * Ctrl
 * 
 * 封装 AST 执行过程中的控制状态，避免使用 Scope.data 保存控制状态
 * 从而污染用户空间数据，目前仅用于 nullSafe、break、continue、return 控制
 * 未来可根据需求引入更多控制状态
 */
public class Ctrl {
	
	private static final int JUMP_NONE = 0;
	private static final int JUMP_BREAK = 1;
	private static final int JUMP_CONTINUE = 2;
	private static final int JUMP_RETURN = 3;
	
	private static final int WISDOM_ASSIGNMENT = 0;
	private static final int LOCAL_ASSIGNMENT = 1;
	private static final int GLOBAL_ASSIGNMENT = 2;
	
	private int jump = JUMP_NONE;
	private int assignmentType = WISDOM_ASSIGNMENT;
	private boolean nullSafe = false;
	
	// 附加对象，可穿透 Scope 传递数据，可传递任意类型数据
	public Object attachment;
	
	public void setAttachment(Object attachment) {
		this.attachment = attachment;
	}
	
	@SuppressWarnings("unchecked")
	public  T getAttachment() {
		return (T)attachment;
	}
	
	public boolean isJump() {
		return jump != JUMP_NONE;
	}
	
	public boolean notJump() {
		return jump == JUMP_NONE;
	}
	
	public boolean isBreak() {
		return jump == JUMP_BREAK;
	}
	
	public void setBreak() {
		jump = JUMP_BREAK;
	}
	
	public boolean isContinue() {
		return jump == JUMP_CONTINUE;
	}
	
	public void setContinue() {
		jump = JUMP_CONTINUE;
	}
	
	public boolean isReturn() {
		return jump == JUMP_RETURN;
	}
	
	public void setReturn() {
		jump = JUMP_RETURN;
	}
	
	public void setJumpNone() {
		jump = JUMP_NONE;
	}
	
	public boolean isWisdomAssignment() {
		return assignmentType == WISDOM_ASSIGNMENT;
	}
	
	public void setWisdomAssignment() {
		assignmentType = WISDOM_ASSIGNMENT;
	}
	
	public boolean isLocalAssignment() {
		return assignmentType == LOCAL_ASSIGNMENT;
	}
	
	public void setLocalAssignment() {
		assignmentType = LOCAL_ASSIGNMENT;
	}
	
	public boolean isGlobalAssignment() {
		return assignmentType == GLOBAL_ASSIGNMENT;
	}
	
	public void setGlobalAssignment() {
		assignmentType = GLOBAL_ASSIGNMENT;
	}
	
	public boolean isNullSafe() {
		return nullSafe;
	}
	
	public boolean notNullSafe() {
		return !nullSafe;
	}
	
	public void setNullSafe(boolean nullSafe) {
		this.nullSafe = nullSafe;
	}
}