com.tesora.dve.sql.node.expression.ActualLiteralExpression.java Source code

Introduction

Here is the source code for com.tesora.dve.sql.node.expression.ActualLiteralExpression.java

Source

package com.tesora.dve.sql.node.expression;

/*
 * #%L
 * Tesora Inc.
 * Database Virtualization Engine
 * %%
 * Copyright (C) 2011 - 2014 Tesora Inc.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */

import java.util.Objects;

import org.apache.commons.lang.ObjectUtils;

import com.tesora.dve.sql.node.LanguageNode;
import com.tesora.dve.sql.parser.SourceLocation;
import com.tesora.dve.sql.parser.TokenTypes;
import com.tesora.dve.sql.schema.ConnectionValues;
import com.tesora.dve.sql.schema.UnqualifiedName;
import com.tesora.dve.sql.schema.cache.IConstantExpression;
import com.tesora.dve.sql.transform.CopyContext;

public class ActualLiteralExpression extends LiteralExpression {

    protected final Object value;

    public ActualLiteralExpression(Object v, int tt, SourceLocation sloc, UnqualifiedName charsetHint) {
        super(tt, sloc, charsetHint);
        this.value = v;
    }

    public ActualLiteralExpression(String s, SourceLocation sloc) {
        super(TokenTypes.Character_String_Literal, sloc, null);
        this.value = s;
    }

    protected ActualLiteralExpression(ActualLiteralExpression other) {
        super(other);
        this.value = other.value;
    }

    public Object getValue() {
        return this.value;
    }

    @Override
    public Object getValue(ConnectionValues cv) {
        return isNullLiteral() ? null : this.value;
    }

    @Override
    protected LanguageNode copySelf(CopyContext cc) {
        ActualLiteralExpression out = new ActualLiteralExpression(this);
        return out;
    }

    @Override
    public int getPosition() {
        return 0;
    }

    @Override
    public IConstantExpression getCacheExpression() {
        // we still require a cache version for p statements, where literals are not delegated.
        return new CachedActualLiteralExpression(getValueType(), getValue());
    }

    @Override
    protected boolean schemaSelfEqual(LanguageNode other) {
        if (!super.schemaSelfEqual(other))
            return false;
        ActualLiteralExpression ale = (ActualLiteralExpression) other;
        return ObjectUtils.equals(this.value, ale.value);
    }

    @Override
    protected int selfHashCode() {
        return Objects.hashCode(this.value);
    }

    @Override
    public boolean equals(Object other) {
        if (other == null) {
            return false;
        } else if (this == other) {
            return true;
        } else if (!(other instanceof ActualLiteralExpression)) {
            return false;
        }

        final ActualLiteralExpression otherExpression = (ActualLiteralExpression) other;

        return (this.getValueType() == otherExpression.getValueType())
                && ObjectUtils.equals(this.value, otherExpression.value);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 17;
        result = prime * result + this.getValueType();
        result = prime * result + Objects.hashCode(this.value);
        return result;
    }

}