co.cask.wrangler.api.parser.Identifier Maven / Gradle / Ivy
/*
* Copyright © 2017-2018 Cask Data, Inc.
*
* Licensed 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 co.cask.wrangler.api.parser;
import co.cask.wrangler.api.annotations.PublicEvolving;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
/**
* The Identifier
class wraps the primitive type {@code String} in a object.
* An object of type {@code Identifier} contains the value in primitive type
* as well as the type of the token this class represents.
*
* In addition, this class provides two methods one to extract the
* value held by this wrapper object, and the second for extracting the
* type of the token.
*
* @see BoolList
* @see ColumnName
* @see ColumnNameList
* @see DirectiveName
* @see Numeric
* @see NumericList
* @see Properties
* @see Ranges
* @see Expression
* @see Text
* @see TextList
*/
@PublicEvolving
public class Identifier implements Token {
/**
* The {@code String} object that represents the value held by the token.
*/
private String value;
/**
* Allocates a {@code String} object representing the
* {@code value} argument.
*
* @param value the value of the {@code String}.
*/
public Identifier(String value) {
this.value = value;
}
/**
* Returns the value of this {@code String} object as a boolean
* primitive.
*
* @return the primitive {@code Identifier} value of this object.
*/
@Override
public String value() {
return value;
}
/**
* Returns the type of this {@code Identifier} object as a {@code TokenType}
* enum.
*
* @return the enumerated {@code TokenType} of this object.
*/
@Override
public TokenType type() {
return TokenType.IDENTIFIER;
}
/**
* Returns the members of this {@code Identifier} object as a {@code JsonElement}.
*
* @return Json representation of this {@code Identifier} object as {@code JsonElement}
*/
@Override
public JsonElement toJson() {
JsonObject object = new JsonObject();
object.addProperty("type", TokenType.IDENTIFIER.name());
object.addProperty("value", value);
return object;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy