asterixdb/asterix-lang-common/src/main/java/org/apache/asterix/lang/common/statement/DeleteStatement.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.asterix.lang.common.statement;

import java.util.Objects;

import org.apache.asterix.common.exceptions.CompilationException;
import org.apache.asterix.common.metadata.DataverseName;
import org.apache.asterix.common.metadata.Namespace;
import org.apache.asterix.lang.common.base.AbstractStatement;
import org.apache.asterix.lang.common.base.Expression;
import org.apache.asterix.lang.common.base.Statement;
import org.apache.asterix.lang.common.expression.VariableExpr;
import org.apache.asterix.lang.common.visitor.base.ILangVisitor;

public class DeleteStatement extends AbstractStatement {

    private final VariableExpr vars;
    private Namespace namespace;
    private String datasetName;
    private final Expression condition;
    private final int varCounter;
    private Query rewrittenQuery;

    public DeleteStatement(VariableExpr vars, Namespace namespace, String datasetName, Expression condition,
            int varCounter) {
        this.vars = vars;
        this.namespace = namespace;
        this.datasetName = datasetName;
        this.condition = condition;
        this.varCounter = varCounter;
    }

    @Override
    public Kind getKind() {
        return Statement.Kind.DELETE;
    }

    public VariableExpr getVariableExpr() {
        return vars;
    }

    public Namespace getNamespace() {
        return namespace;
    }

    public String getDatabaseName() {
        return namespace == null ? null : namespace.getDatabaseName();
    }

    public DataverseName getDataverseName() {
        return namespace == null ? null : namespace.getDataverseName();
    }

    public void setNamespace(Namespace namespace) {
        this.namespace = namespace;
    }

    public String getDatasetName() {
        return datasetName;
    }

    public void setDatasetName(String datasetName) {
        this.datasetName = datasetName;
    }

    public Expression getCondition() {
        return condition;
    }

    public int getVarCounter() {
        return varCounter;
    }

    public void setQuery(Query rewrittenQuery) {
        this.rewrittenQuery = rewrittenQuery;
    }

    public Query getQuery() {
        return rewrittenQuery;
    }

    @Override
    public <R, T> R accept(ILangVisitor<R, T> visitor, T arg) throws CompilationException {
        return visitor.visit(this, arg);
    }

    @Override
    public int hashCode() {
        return Objects.hash(condition, datasetName, namespace, rewrittenQuery, vars);
    }

    @Override
    @SuppressWarnings("squid:S1067") // expressions should not be too complex
    public boolean equals(Object object) {
        if (this == object) {
            return true;
        }
        if (!(object instanceof DeleteStatement)) {
            return false;
        }
        DeleteStatement target = (DeleteStatement) object;
        return Objects.equals(condition, target.condition) && Objects.equals(datasetName, target.datasetName)
                && Objects.equals(namespace, target.namespace) && Objects.equals(rewrittenQuery, target.rewrittenQuery)
                && Objects.equals(vars, target.vars) && varCounter == target.varCounter;
    }

    @Override
    public byte getCategory() {
        return Category.UPDATE;
    }
}