io.konig.formula.FunctionExpression Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of konig-core Show documentation
A library for core classes (Graph, Vertex, Edge, etc.)
There is a newer version: 2.11.0
package io.konig.formula;

/*
 * #%L
 * Konig Core
 * %%
 * Copyright (C) 2015 - 2017 Gregory McFall
 * %%
 * 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.
 * #L%
 */

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

import org.openrdf.model.Literal;
import org.openrdf.model.URI;
import org.openrdf.model.impl.LiteralImpl;
import org.openrdf.model.impl.URIImpl;

import io.konig.core.Context;
import io.konig.core.io.PrettyPrintWriter;
import io.konig.core.util.IriTemplate;
import io.konig.core.util.ValueFormat;

public class FunctionExpression extends AbstractFormula implements BuiltInCall {
	public static final String SUM = "SUM";
	public static final String AVG = "AVG";
	public static final String COUNT = "COUNT";
	public static final String DAY = "DAY";
	public static final String MONTH = "MONTH";
	public static final String YEAR = "YEAR";
	public static final String TIME_INTERVAL = "TIME_INTERVAL";
	public static final String UNIX_TIME = "UNIX_TIME";
	public static final String CONCAT = "CONCAT";
	public static final String SUBSTR = "SUBSTR";
	public static final String STRPOS = "STRPOS";
	public static final String IRI = "IRI";
	public static final String STRIP_SPACES = "STRIP_SPACES";

	private String functionName;
	private List argList = new ArrayList<>();
	private FunctionModel model;
	
	public static FunctionExpression fromIriTemplate(IriTemplate template) {
		
		List argList = new ArrayList<>();
		
		Context context = template.getContext();
		context.compile();
		for (ValueFormat.Element e : template.toList()) {
			
			String text = e.getText();
			switch (e.getType()) {
			
			case TEXT :
				Literal literal = new LiteralImpl(text);
				argList.add(ConditionalOrExpression.wrap(new LiteralFormula(literal)));
				break;
				
			case VARIABLE:
				URI iri = new URIImpl(context.expandIRI(text));
				
				FullyQualifiedIri iriTerm = new FullyQualifiedIri(iri);
				argList.add(ConditionalOrExpression.wrap(iriTerm));
				break;
			}
			
		}
		
		return new FunctionExpression(FunctionModel.CONCAT, argList);
	}

	public FunctionExpression(FunctionModel model, Expression... arg) {

		this.functionName = model.getName();
		this.model = model;
		this.argList = new ArrayList<>();
		for (Expression e : arg) {
			argList.add(e);
		}
	}

	public FunctionExpression(FunctionModel model, List argList) {
		this.functionName = model.getName();
		this.model = model;
		this.argList = argList;
	}

	public FunctionModel getModel() {
		return model;
	}

	public boolean isAggregation() {
		return functionName.equalsIgnoreCase(SUM) || functionName.equalsIgnoreCase(COUNT);
	}

	public static String getSum() {
		return SUM;
	}

	public String getFunctionName() {
		return functionName;
	}

	public void addArg(Expression arg) {
		argList.add(arg);
	}

	public List getArgList() {
		return argList;
	}
	
	@Override
	public FunctionExpression clone() {
		List otherArgList = new ArrayList<>();
		for (Expression e : argList) {
			otherArgList.add(e.clone());
		}
		return new FunctionExpression(model, otherArgList);
	}

	@Override
	public void print(PrettyPrintWriter out) {
		out.print(functionName);
		out.print('(');
		String comma = "";
		for (Expression arg : argList) {
			out.print(comma);
			comma = ", ";
			out.print(arg);
		}
		out.print(')');

	}

	@Override
	public void dispatch(FormulaVisitor visitor) {
		visitor.enter(this);
		for (Expression arg : argList) {
			arg.dispatch(visitor);
		}
		visitor.exit(this);
	}

}