/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.yang.data.impl.leafref;

import static java.util.Objects.requireNonNull;

import org.opendaylight.yangtools.concepts.Immutable;
import org.opendaylight.yangtools.yang.common.QName;

class QNamePredicateImpl implements Immutable, QNamePredicate {
    private final QName identifier;
    private final LeafRefPath pathKeyExpression;

    QNamePredicateImpl(final QName identifier, final LeafRefPath pathKeyExpression) {
        this.identifier = requireNonNull(identifier, "QNamePredicate: identifier should not be null");
        this.pathKeyExpression = requireNonNull(pathKeyExpression,
            "QNamePredicate: pathKeyExpression should not be null");
    }

    @Override
    public QName getIdentifier() {
        return identifier;
    }

    @Override
    public LeafRefPath getPathKeyExpression() {
        return pathKeyExpression;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append('[').append(identifier).append("=current()");

        for (final QNameWithPredicate qname : pathKeyExpression.getPathFromRoot()) {
            sb.append('/').append(qname);
        }

        return sb.append(']').toString();
    }
}