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// Copyright 2017 Yahoo Holdings. 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.DocumentId;
import com.yahoo.document.BucketIdFactory;
import com.yahoo.document.select.BucketSet;
import com.yahoo.document.select.Context;
import com.yahoo.document.select.Visitor;
/**
* @author Simon Thoresen Hult
*/
public class IdNode implements ExpressionNode {
private String field;
private short widthBits = -1;
private short divisionBits = -1;
public IdNode() {
// empty
}
public String getField() {
return field;
}
public IdNode setField(String field) {
this.field = field;
return this;
}
public IdNode setWidthBits(short widthBits) {
this.widthBits = widthBits;
return this;
}
public IdNode setDivisionBits(short divisionBits) {
this.divisionBits = divisionBits;
return this;
}
@Override
public BucketSet getBucketSet(BucketIdFactory factory) {
return null;
}
@Override
public Object evaluate(Context context) {
DocumentId id = context.getDocumentOperation().getId();
if (id == null) {
throw new IllegalStateException("Document has no identifier.");
}
if (field == null) {
return id.toString();
} else if (field.equalsIgnoreCase("scheme")) {
return id.getScheme().getType().toString();
} else if (field.equalsIgnoreCase("namespace")) {
return id.getScheme().getNamespace();
} else if (field.equalsIgnoreCase("specific")) {
return id.getScheme().getNamespaceSpecific();
} else if (field.equalsIgnoreCase("group")) {
if (id.getScheme().hasGroup()) {
return id.getScheme().getGroup();
}
throw new IllegalStateException("Group identifier is null.");
} else if (field.equalsIgnoreCase("user")) {
if (id.getScheme().hasNumber()) {
return id.getScheme().getNumber();
}
throw new IllegalStateException("User identifier is null.");
} else if (field.equalsIgnoreCase("type")) {
if (id.getScheme().hasDocType()) {
return id.getScheme().getDocType();
}
throw new IllegalStateException("Document id doesn't have doc type.");
} else {
throw new IllegalStateException("Identifier field '" + field + "' is not supported.");
}
}
@Override
public void accept(Visitor visitor) {
visitor.visit(this);
}
@Override
public String toString() {
return "id" + (field != null ? "." + field : "") + (widthBits != -1 ? "(" + widthBits + "," + divisionBits + ")" : "");
}
}
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