/*-
 * 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.sling.query.impl.resource;

import org.apache.sling.api.resource.Resource;
import org.apache.sling.query.impl.predicate.SelectorOperator;
import org.apache.sling.query.impl.selector.parser.Attribute;

import java.util.function.Predicate;

public class ResourcePropertyPredicate implements Predicate<Resource> {
    private final String key;

    private final String value;

    private final SelectorOperator operator;

    public ResourcePropertyPredicate(Attribute attribute) {
        this.key = attribute.getKey();
        this.value = attribute.getValue();
        this.operator = SelectorOperator.getSelectorOperator(attribute.getOperator());
    }

    @Override
    public boolean test(Resource resource) {
        Resource property = resource.getChild(key);
        if (property == null) {
            return false;
        } else if (value == null) {
            return true;
        } else {
            return isEqualToValue(property);
        }
    }

    private boolean isEqualToValue(Resource property) {
        final String[] multiProperty = property.adaptTo(String[].class);
        if (multiProperty != null) {
            for (String p : multiProperty) {
                if (operator.accepts(p, value)) {
                    return true;
                }
            }
            return false;
        } else {
            return operator.accepts(property.adaptTo(String.class), value);
        }
    }
}