com.api.jsonata4java.expressions.functions.ContainsFunction Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of JSONata4Java Show documentation
Port of jsonata.js to Java to enable rules for JSON content
There is a newer version: 2.5.1
/**
 * (c) Copyright 2018, 2019 IBM Corporation
 * 1 New Orchard Road, 
 * Armonk, New York, 10504-1722
 * United States
 * +1 914 499 1900
 * support: Nathaniel Mills [email protected]
 *
 * 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.api.jsonata4java.expressions.functions;

import com.api.jsonata4java.expressions.EvaluateRuntimeException;
import com.api.jsonata4java.expressions.ExpressionsVisitor;
import com.api.jsonata4java.expressions.generated.MappingExpressionParser.Function_callContext;
import com.api.jsonata4java.expressions.utils.Constants;
import com.api.jsonata4java.expressions.utils.FunctionUtils;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.BooleanNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;

/**
 * From http://docs.jsonata.org/string-functions.html:
 * 
 * $contains(str, pattern)
 * 
 * Returns true if str is matched by pattern, otherwise it returns false. If str
 * is not specified (i.e. this function is invoked with one argument), then the
 * context value is used as the value of str.
 * 
 * The pattern parameter can either be a string or a regular expression (regex).
 * If it is a string, the function returns true if the characters within pattern
 * are contained contiguously within str. If it is a regex, the function will
 * return true if the regex matches the contents of str.
 * 
 * Examples
 * 
 * $contains("abracadabra", "bra")==true $contains("abracadabra", /a.*a/) ==
 * true $contains("abracadabra", /ar.*a/)==false $contains("Hello World",
 * /wo/)==false $contains("Hello World", /wo/i)==true
 * Phone[$contains(number, /^077/)]=={ "type": "mobile", "number": "077 7700
 * 1234" }
 * 
 */
public class ContainsFunction extends FunctionBase implements Function {

	public static String ERR_BAD_CONTEXT = String.format(Constants.ERR_MSG_BAD_CONTEXT, Constants.FUNCTION_CONTAINS);
	public static String ERR_ARG1BADTYPE = String.format(Constants.ERR_MSG_ARG1_BAD_TYPE, Constants.FUNCTION_CONTAINS);
	public static String ERR_ARG2BADTYPE = String.format(Constants.ERR_MSG_ARG2_BAD_TYPE, Constants.FUNCTION_CONTAINS);
	public static String ERR_ARG3BADTYPE = String.format(Constants.ERR_MSG_ARG3_BAD_TYPE, Constants.FUNCTION_CONTAINS);
	public static ObjectMapper s_objectMapper = new ObjectMapper();
	public JsonNode invoke(ExpressionsVisitor expressionVisitor, Function_callContext ctx) {
		// Create the variable to return
		JsonNode result = null;

		// Retrieve the number of arguments
		JsonNode argString = JsonNodeFactory.instance.nullNode();
		boolean useContext = FunctionUtils.useContextVariable(this, ctx, getSignature());
		int argCount = getArgumentCount(ctx);
		if (useContext) {
			argString = FunctionUtils.getContextVariable(expressionVisitor);
			if (argString != null && argString.isNull() == false) {
				// check to see if there is a valid context value
				if (!argString.isTextual()) {
	            // handle Object
	            if (argString.isObject()) {
	               argString = FunctionUtils.getValuesListExpression(expressionVisitor, ctx, 0);
	            } else {
	               throw new EvaluateRuntimeException(ERR_BAD_CONTEXT);
	            }
				} else {
				   argCount++;
				}
			} else {
				useContext = false;
			}
		}

		// Make sure that we have the right number of arguments
		if (argCount == 2) {
			if (!useContext) {
				argString = FunctionUtils.getValuesListExpression(expressionVisitor, ctx, 0);
			}
			if (argString == null) {
				return null;
			}
			if (!argString.isTextual()) {
				throw new EvaluateRuntimeException(ERR_ARG1BADTYPE);
			}
			final JsonNode argPattern = FunctionUtils.getValuesListExpression(expressionVisitor, ctx, 1);

			if (!argString.isTextual()) {
				throw new EvaluateRuntimeException(ERR_ARG1BADTYPE);
			}
			// Make sure argPattern is not null
			if (argPattern != null) {
				// Check to see if the pattern is just a string
				if (argPattern.isTextual()) {
					final String str = argString.textValue();
					final String pattern = argPattern.textValue();

					// Do a simple String::contains
					result = str.contains(pattern) ? BooleanNode.TRUE : BooleanNode.FALSE;
				} else {
					/*
					 * TODO: Add support for regex patterns once the grammar has been updated. For
					 * now, simply throw an exception.
					 */
					throw new EvaluateRuntimeException(ERR_ARG2BADTYPE);
				}
			} else {
				throw new EvaluateRuntimeException(ERR_ARG2BADTYPE);
			}
		} else {
			throw new EvaluateRuntimeException(argCount < 2 ? ERR_BAD_CONTEXT : ERR_ARG3BADTYPE);
		}

		return result;
	}

	@Override
	public int getMaxArgs() {
		return 2;
	}
	@Override
	public int getMinArgs() {
		return 1; // account for context variable
	}

	@Override
	public String getSignature() {
		// accepts a string (or context variable), a string or function, returns a
		// boolean
		return "";
	}

}