com.blazebit.persistence.parser.expression.FunctionExpression Maven / Gradle / Ivy

/*
 * Copyright 2014 - 2020 Blazebit.
 *
 * Licensed 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 com.blazebit.persistence.parser.expression;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author Christian Beikov
 * @author Moritz Becker
 * @since 1.0.0
 */
public class FunctionExpression extends AbstractExpression {

    protected final String functionName;
    protected final WindowDefinition windowDefinition;
    protected final Expression realArgument;
    protected List expressions;
    protected WindowDefinition resolvedWindowDefinition;

    @SuppressWarnings("unchecked")
    public FunctionExpression(String functionName, List expressions) {
        this.functionName = functionName;
        this.expressions = (List) expressions;
        this.realArgument = null;
        this.windowDefinition = null;
    }

    @SuppressWarnings("unchecked")
    public FunctionExpression(String functionName, List expressions, Expression realArgument) {
        this.functionName = functionName;
        this.expressions = (List) expressions;
        this.realArgument = realArgument;
        this.windowDefinition = null;
    }

    @SuppressWarnings("unchecked")
    public FunctionExpression(String functionName, List expressions, WindowDefinition windowDefinition) {
        this.functionName = functionName;
        this.expressions = (List) expressions;
        this.realArgument = null;
        this.windowDefinition = windowDefinition;
    }

    @SuppressWarnings("unchecked")
    private FunctionExpression(String functionName, List expressions, Expression realArgument, WindowDefinition windowDefinition) {
        this.functionName = functionName;
        this.expressions = (List) expressions;
        this.realArgument = realArgument;
        this.windowDefinition = windowDefinition;
    }

    @Override
    public FunctionExpression copy(ExpressionCopyContext copyContext) {
        int size = expressions.size();
        List newExpressions = new ArrayList(size);

        for (int i = 0; i < size; i++) {
            newExpressions.add(expressions.get(i).copy(copyContext));
        }

        return new FunctionExpression(functionName, newExpressions, realArgument == null ? null : realArgument.copy(copyContext), windowDefinition == null ? null : windowDefinition.copy(copyContext));
    }

    @Override
    public void accept(Visitor visitor) {
        visitor.visit(this);
    }

    @Override
    public  T accept(ResultVisitor visitor) {
        return visitor.visit(this);
    }

    public String getFunctionName() {
        return functionName;
    }

    public Expression getRealArgument() {
        return realArgument;
    }

    public List getExpressions() {
        return expressions;
    }

    public void setExpressions(List expressions) {
        this.expressions = expressions;
    }

    public WindowDefinition getWindowDefinition() {
        return windowDefinition;
    }

    public WindowDefinition getResolvedWindowDefinition() {
        return resolvedWindowDefinition;
    }

    public void setResolvedWindowDefinition(WindowDefinition resolvedWindowDefinition) {
        this.resolvedWindowDefinition = resolvedWindowDefinition;
    }

    @Override
    public int hashCode() {
        return functionName.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final FunctionExpression other = (FunctionExpression) obj;
        if ((this.functionName == null) ? (other.functionName != null) : !this.functionName.equals(other.functionName)) {
            return false;
        }
        if (this.expressions != other.expressions && (this.expressions == null || !this.expressions.equals(other.expressions))) {
            return false;
        }
        return true;
    }
}