java/org/apache/el/parser/AstAbstractEmpty.java

/*
 * 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.
 */
/* Generated By:JJTree: Do not edit this line. AstEmpty.java */
package org.apache.el.parser;

import java.util.Collection;
import java.util.Map;

import jakarta.el.ELException;

import org.apache.el.lang.EvaluationContext;

public abstract class AstAbstractEmpty extends SimpleNode {

    private final Boolean RETURN_EMPTY;

    private final Boolean RETURN_NOT_EMPTY;


    public AstAbstractEmpty(int id, boolean invert) {
        super(id);
        if (invert) {
            RETURN_EMPTY = Boolean.FALSE;
            RETURN_NOT_EMPTY = Boolean.TRUE;
        } else {
            RETURN_EMPTY = Boolean.TRUE;
            RETURN_NOT_EMPTY = Boolean.FALSE;
        }
    }


    @Override
    public Class<?> getType(EvaluationContext ctx) throws ELException {
        return Boolean.class;
    }


    @Override
    public Object getValue(EvaluationContext ctx) throws ELException {
        Object obj = this.children[0].getValue(ctx);
        if (obj == null || obj instanceof String && ((String) obj).isEmpty() ||
                obj instanceof Object[] && ((Object[]) obj).length == 0 ||
                obj instanceof Collection<?> && ((Collection<?>) obj).isEmpty() ||
                obj instanceof Map<?,?> && ((Map<?,?>) obj).isEmpty()) {
            return RETURN_EMPTY;
        }
        return RETURN_NOT_EMPTY;
    }
}