com.fasterxml.jackson.dataformat.avro.AvroReadContext Maven / Gradle / Ivy

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Support for reading and writing AVRO-encoded data via Jackson abstractions.

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package com.fasterxml.jackson.dataformat.avro;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonStreamContext;
import com.fasterxml.jackson.core.JsonToken;

/**
 * We need to use a custom context to be able to carry along
 * Object and array records.
 */
public abstract class AvroReadContext extends JsonStreamContext
{
    protected final AvroReadContext _parent;

    /*
    /**********************************************************************
    /* Instance construction
    /**********************************************************************
     */

    public AvroReadContext(AvroReadContext parent)
    {
        super();
        _parent = parent;
    }

    public abstract JsonToken nextToken() throws IOException;
    
    /*
    /**********************************************************************
    /* Accessors
    /**********************************************************************
     */

    @Override
    public String getCurrentName() { return null; }

    @Override
    public final AvroReadContext getParent() { return _parent; }
    
    protected abstract void appendDesc(StringBuilder sb);

    /*
    /**********************************************************************
    /* Helper methods
    /**********************************************************************
     */

    protected void _reportError() {
        throw new IllegalStateException("Can not read Avro input without specifying Schema");
    }
    
    /*
    /**********************************************************************
    /* Overridden standard methods
    /**********************************************************************
     */
    
    /**
     * Overridden to provide developer writeable "JsonPath" representation
     * of the context.
     */
    @Override
    public final String toString()
    {
        StringBuilder sb = new StringBuilder(64);
        appendDesc(sb);
        return sb.toString();
    }
}