org.apache.drill.exec.store.easy.json.parser

Class ValueParser

java.lang.Object

org.apache.drill.exec.store.easy.json.parser.AbstractElementParser

org.apache.drill.exec.store.easy.json.parser.ValueParser

All Implemented Interfaces:

ElementParser

Direct Known Subclasses:

BaseExtendedValueParser, JsonValueParser, ScalarValueParser

public abstract class ValueParser
extends AbstractElementParser

Parses a JSON value. JSON allows any value type to appear anywhere a value is allowed; this parser reflects that rule. The associated listener is responsible for semantics: whether a given value should be allowed.

Scalar value processing occurs in one of two ways:

• Typed: The type of the JSON value determines which of the listener "on" method is called. This ensures that the JSON text is parsed into typed values using JSON's parsing rules.
• Text: The text value is passed to the listener's onString() method regardless of the JSON type. (That is, according to Drill's "all-text mode."

Listeners can enforce one type only, or can be more flexible and allow multiple types.

Field Summary

Fields

Modifier and Type	Field and Description
protected ValueListener	listener

Constructor Summary

Constructors

Constructor and Description
ValueParser(JsonStructureParser structParser, ValueListener listener)

Method Summary

Methods inherited from class org.apache.drill.exec.store.easy.json.parser.AbstractElementParser

errorFactory, structParser

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.drill.exec.store.easy.json.parser.ElementParser

parse

Field Detail

listener

protected ValueListener listener

Constructor Detail

ValueParser

public ValueParser(JsonStructureParser structParser,
                   ValueListener listener)