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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.select.rule;
import com.yahoo.document.BucketIdFactory;
import com.yahoo.document.DocumentOperation;
import com.yahoo.document.DocumentPut;
import com.yahoo.document.DocumentUpdate;
import com.yahoo.document.select.BucketSet;
import com.yahoo.document.select.Context;
import com.yahoo.document.select.Visitor;
/**
* A document node which returns a document: For accessing document field data in AttributeNode,
* where it should be possible to access fields both by the concrete type ("concreteType.fieldName")
* and by parent type ("inheritedType.inheritedField").
*
* @author Simon Thoresen Hult
* @author bratseth
*/
public class DocumentNode implements ExpressionNode {
private String type;
public DocumentNode(String type) {
this.type = type;
}
public String getType() {
return type;
}
public DocumentNode setType(String type) {
this.type = type;
return this;
}
@Override
public BucketSet getBucketSet(BucketIdFactory factory) {
return null;
}
@Override
public Object evaluate(Context context) {
return evaluate(context.getDocumentOperation());
}
private Object evaluate(DocumentOperation op) {
if (hasData(op))
return evaluateForDataLookup(op);
else // Simplify to just false since we can't progress here?
return op.getId().getDocType().equals(type) ? op : false;
}
private Object evaluateForDataLookup(DocumentOperation op) {
if (op instanceof DocumentPut)
return ((DocumentPut)op).getDocument().getDataType().isA(this.type) ? op : false;
else if (op instanceof DocumentUpdate)
return ((DocumentUpdate)op).getDocumentType().isA(this.type) ? op : false;
else
throw new IllegalStateException("Programming error");
}
/** Returns whether this operation is of a type that may contain data */
private boolean hasData(DocumentOperation op) {
return op instanceof DocumentPut || op instanceof DocumentUpdate;
}
public void accept(Visitor visitor) {
visitor.visit(this);
}
@Override
public String toString() {
return type;
}
}
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