com.alibaba.simpleEL.dialect.tiny.ast.TinyELAstNode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of SimpleEL Show documentation

simple expression language implementation

The newest version!

package com.alibaba.simpleEL.dialect.tiny.ast;

import java.util.List;

import com.alibaba.simpleEL.dialect.tiny.visitor.TinyELAstVisitor;

public abstract class TinyELAstNode {
	public final void accept(TinyELAstVisitor visitor) {
		if (visitor == null) {
			throw new IllegalArgumentException();
		}

		visitor.preVisit(this);

		accept0(visitor);

		visitor.postVisit(this);
	}

	protected abstract void accept0(TinyELAstVisitor visitor);

	protected final void acceptChild(TinyELAstVisitor visitor,
			List children) {
		for (TinyELAstNode child : children)
			acceptChild(visitor, child);
	}

	protected final void acceptChild(TinyELAstVisitor visitor, TinyELAstNode child) {
		if (child == null) {
			return;
		}

		child.accept(visitor);
	}
	
	public abstract void output(StringBuffer buf);
	
	public String toString() {
		StringBuffer out = new StringBuffer();
		output(out);
		return out.toString();
	}
}