/*-
 * 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.predicate;

import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;

public enum SelectorOperator {
    CONTAINS("*=") {
        @Override
        public boolean accepts(String property, String value) {
            return StringUtils.contains(property, value);
        }
    },
    CONTAINS_WORD("~=") {
        @Override
        public boolean accepts(String property, String value) {
            String quoted = Pattern.quote(value);
            String regex = String.format("(^| )%s( |$)", quoted);
            return property != null && Pattern.compile(regex).matcher(property).find();
        }
    },
    ENDS_WITH("$=") {
        @Override
        public boolean accepts(String property, String value) {
            return StringUtils.endsWith(property, value);
        }
    },
    EQUALS("=") {
        @Override
        public boolean accepts(String property, String value) {
            return StringUtils.equals(property, value);
        }
    },
    NOT_EQUAL("!=") {
        @Override
        public boolean accepts(String property, String value) {
            return !StringUtils.equals(property, value);
        }
    },
    STARTS_WITH("^=") {
        @Override
        public boolean accepts(String property, String value) {
            return StringUtils.startsWith(property, value);
        }
    };

    private final String operator;

    SelectorOperator(String operator) {
        this.operator = operator;
    }

    public abstract boolean accepts(String key, String value);

    public static SelectorOperator getSelectorOperator(String operator) {
        for (SelectorOperator o : values()) {
            if (o.operator.equals(operator)) {
                return o;
            }
        }
        return EQUALS;
    }
}