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The Apache Commons JEXL library is an implementation of the JSTL Expression Language with extensions.

There is a newer version: 3.4.0

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.jexl3.parser;

import org.apache.commons.jexl3.internal.Debugger;

public final class ASTSetLiteral extends JexlNode {
    /** Whether this set is constant or not. */
    private boolean constant = false;

    ASTSetLiteral(int id) {
        super(id);
    }

    ASTSetLiteral(Parser p, int id) {
        super(p, id);
    }

    @Override
    public String toString() {
        Debugger dbg = new Debugger();
        return dbg.data(this);
    }

    @Override
    protected boolean isConstant(boolean literal) {
        return constant;
    }

    @Override
    public void jjtClose() {
        constant = true;
        for (int c = 0; c < jjtGetNumChildren() && constant; ++c) {
            JexlNode child = jjtGetChild(c);
            if (!child.isConstant()) {
                constant = false;
            }
        }
    }

    @Override
    public Object jjtAccept(ParserVisitor visitor, Object data) {
        return visitor.visit(this, data);
    }

}