FilterOp.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.
 *
 * Copied from the Apache UIMA Sandbox Dictionary Annotator.
 */
package de.tudarmstadt.ukp.dkpro.core.api.featurepath;

/**
 * Filter operators
 */
public enum FilterOp
{
    // TODO bug 17

    NULL, NOT_NULL, EQUALS, NOT_EQUALS, LESS, LESS_EQ, GREATER, GREATER_EQ;

    @Override
    public String toString()
    {
        switch (this) {
        case NULL: {
            return "null";
        }
        case NOT_NULL: {
            return "!null";
        }
        case EQUALS: {
            return "=";
        }
        case NOT_EQUALS: {
            return "!=";
        }
        case LESS: {
            return "<";
        }
        case LESS_EQ: {
            return "<=";
        }
        case GREATER: {
            return "<";
        }
        case GREATER_EQ: {
            return "<=";
        }
        default: {
            return "";
        }
        }
    }
}