io.crate.sql.tree.FrameBound.java Source code

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Here is the source code for io.crate.sql.tree.FrameBound.java

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/*
 * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
 * license agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial agreement.
 */

package io.crate.sql.tree;

import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.base.Optional;

import static com.google.common.base.Preconditions.checkNotNull;

public class FrameBound extends Node {
    public enum Type {
        UNBOUNDED_PRECEDING, PRECEDING, CURRENT_ROW, FOLLOWING, UNBOUNDED_FOLLOWING
    }

    private final Type type;
    private final Optional<Expression> value;

    public FrameBound(Type type) {
        this(type, null);
    }

    public FrameBound(Type type, Expression value) {
        this.type = checkNotNull(type, "type is null");
        this.value = Optional.fromNullable(value);
    }

    public Type getType() {
        return type;
    }

    public Optional<Expression> getValue() {
        return value;
    }

    @Override
    public <R, C> R accept(AstVisitor<R, C> visitor, C context) {
        return visitor.visitFrameBound(this, context);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if ((obj == null) || (getClass() != obj.getClass())) {
            return false;
        }
        FrameBound o = (FrameBound) obj;
        return Objects.equal(type, o.type) && Objects.equal(value, o.value);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(type, value);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(this).add("type", type).add("value", value).toString();
    }
}