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package com.fasterxml.jackson.databind.node;
import java.io.IOException;
import java.util.List;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.type.WritableTypeId;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
/**
* This intermediate base class is used for all leaf nodes, that is,
* all non-container (array or object) nodes, except for the
* "missing node".
*/
public abstract class ValueNode
extends BaseJsonNode
{
private static final long serialVersionUID = 1L;
protected ValueNode() { }
@Override
protected JsonNode _at(JsonPointer ptr) {
// will only allow direct matches, but no traversal through
// (base class checks for direct match)
return MissingNode.getInstance();
}
/**
* All current value nodes are immutable, so we can just return
* them as is.
*/
@SuppressWarnings("unchecked")
@Override
public <T extends JsonNode> T deepCopy() { return (T) this; }
@Override public abstract JsonToken asToken();
@Override
public void serializeWithType(JsonGenerator g, SerializerProvider provider,
TypeSerializer typeSer)
throws IOException
{
WritableTypeId typeIdDef = typeSer.writeTypePrefix(g,
typeSer.typeId(this, asToken()));
serialize(g, provider);
typeSer.writeTypeSuffix(g, typeIdDef);
}
/*
/**********************************************************************
/* Basic property access
/**********************************************************************
*/
@Override
public boolean isEmpty() { return true; }
/*
/**********************************************************************
/* Navigation methods
/**********************************************************************
*/
@Override
public final JsonNode get(int index) { return null; }
@Override
public final JsonNode path(int index) { return MissingNode.getInstance(); }
@Override
public final boolean has(int index) { return false; }
@Override
public final boolean hasNonNull(int index) { return false; }
@Override
public final JsonNode get(String fieldName) { return null; }
@Override
public final JsonNode path(String fieldName) { return MissingNode.getInstance(); }
@Override
public final boolean has(String fieldName) { return false; }
@Override
public final boolean hasNonNull(String fieldName) { return false; }
/*
**********************************************************************
* Find methods: all "leaf" nodes return the same for these
**********************************************************************
*/
@Override
public final JsonNode findValue(String fieldName) {
return null;
}
// note: co-variant return type
@Override
public final ObjectNode findParent(String fieldName) {
return null;
}
@Override
public final List<JsonNode> findValues(String fieldName, List<JsonNode> foundSoFar) {
return foundSoFar;
}
@Override
public final List<String> findValuesAsText(String fieldName, List<String> foundSoFar) {
return foundSoFar;
}
@Override
public final List<JsonNode> findParents(String fieldName, List<JsonNode> foundSoFar) {
return foundSoFar;
}
}
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