/*
 * 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.parser.stmt.rfc6020;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.DescriptionStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.ErrorAppTagStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.ErrorMessageStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.MustStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.ReferenceStatement;
import org.opendaylight.yangtools.yang.parser.spi.SubstatementValidator;
import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractDeclaredStatement;
import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.effective.MustEffectiveStatementImpl;

public class MustStatementImpl extends AbstractDeclaredStatement<RevisionAwareXPath> implements MustStatement {
    private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(YangStmtMapping
            .MUST)
            .addOptional(YangStmtMapping.DESCRIPTION)
            .addOptional(YangStmtMapping.ERROR_APP_TAG)
            .addOptional(YangStmtMapping.ERROR_MESSAGE)
            .addOptional(YangStmtMapping.REFERENCE)
            .build();

    protected MustStatementImpl(final StmtContext<RevisionAwareXPath, MustStatement, ?> context) {
        super(context);
    }

    public static class Definition extends
            AbstractStatementSupport<RevisionAwareXPath, MustStatement, EffectiveStatement<RevisionAwareXPath, MustStatement>> {

        public Definition() {
            super(YangStmtMapping.MUST);
        }

        @Override
        public RevisionAwareXPath parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
            return Utils.parseXPath(ctx, value);
        }

        @Override
        public MustStatement createDeclared(final StmtContext<RevisionAwareXPath, MustStatement, ?> ctx) {
            return new MustStatementImpl(ctx);
        }

        @Override
        public EffectiveStatement<RevisionAwareXPath, MustStatement> createEffective(
                final StmtContext<RevisionAwareXPath, MustStatement, EffectiveStatement<RevisionAwareXPath, MustStatement>> ctx) {
            return new MustEffectiveStatementImpl(ctx);
        }

        @Override
        protected SubstatementValidator getSubstatementValidator() {
            return SUBSTATEMENT_VALIDATOR;
        }
    }

    @Nonnull
    @Override
    public RevisionAwareXPath getCondition() {
        return argument();
    }

    @Nullable
    @Override
    public ErrorAppTagStatement getErrorAppTagStatement() {
        return firstDeclared(ErrorAppTagStatement.class);
    }

    @Nullable
    @Override
    public ErrorMessageStatement getErrorMessageStatement() {
        return firstDeclared(ErrorMessageStatement.class);
    }

    @Nullable
    @Override
    public DescriptionStatement getDescription() {
        return firstDeclared(DescriptionStatement.class);
    }

    @Nullable
    @Override
    public ReferenceStatement getReference() {
        return firstDeclared(ReferenceStatement.class);
    }
}