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

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/*
 * 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.jexl2.parser;

public final class ASTArrayLiteral extends JexlNode implements JexlNode.Literal {
    /** The type literal value. */
    Object array = null;
    /** Whether this array is constant or not. */
    boolean constant = false;

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

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


    /** {@inheritDoc} */
    @Override
    public void jjtClose() {
        if (children == null || children.length == 0) {
            array = new Object[0];
            constant = true;
        } else {
            constant = isConstant();
        }
    }

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

    /**
     * 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 != null && !literal.getClass().isArray()) {
                throw new IllegalArgumentException(literal.getClass() + " is not an array");
            }
            this.array = literal;
        }
    }

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















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