ASTMapLiteral.java

/*
* Copyright 2016 Nabarun Mondal
* 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.noga.njexl.lang.parser;

import java.util.Collections;
import java.util.Map;

public final class ASTMapLiteral extends JexlNode implements JexlNode.Literal<Object> {
    /** The type literal value. */
    Map<?,?> map = null;
    /** Whether this array is constant or not. */
    boolean constant = false;

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

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


    /** {@inheritDoc} */
    @Override
    public void jjtClose() {
        if (children == null || children.length == 0) {
            map = Collections.EMPTY_MAP;
            constant = true;
        } else {
            constant = isConstant();
        }
    }

    /**
     *  Gets the literal value.
     * @return the array literal
     */
    public Object getLiteral() {
        return map;
    }

    /**
     * Sets the literal value only if the descendants of this node compose a constant
     * @param literal the literal array value
     * @throws IllegalArgumentException if literal is not an array or null
     */
    public void setLiteral(Object literal) {
        if (constant) {
            if (!(literal instanceof Map<?,?>)) {
                throw new IllegalArgumentException(literal.getClass() + " is not an array");
            }
            this.map = (Map<?,?>) literal;
        }
    }

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