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Port of jsonata.js to Java to enable rules for JSON content
/**
* (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.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.LongNode;
public class IndexOfFunction extends FunctionBase implements Function {
public static String ERR_BAD_CONTEXT = String.format(Constants.ERR_MSG_BAD_CONTEXT, Constants.FUNCTION_INDEX_OF);
public static final String ERR_ARG1_TYPE = String.format(Constants.ERR_MSG_ARG1_MUST_BE_ARRAY,
Constants.FUNCTION_INDEX_OF);
public static String ERR_ARG2BADTYPE = String.format(Constants.ERR_MSG_ARG2_BAD_TYPE, Constants.FUNCTION_INDEX_OF);
public static String ERR_ARG3BADTYPE = String.format(Constants.ERR_MSG_ARG3_BAD_TYPE, Constants.FUNCTION_INDEX_OF);
public JsonNode invoke(ExpressionsVisitor expressionVisitor, Function_callContext ctx) {
// Retrieve the number of arguments
JsonNode arg = JsonNodeFactory.instance.nullNode();
boolean useContext = FunctionUtils.useContextVariable(this, ctx, getSignature());
int argCount = getArgumentCount(ctx);
if (useContext) {
arg = FunctionUtils.getContextVariable(expressionVisitor);
if (arg != null && arg.isNull() == false) {
argCount++;
} else {
useContext = false;
}
}
// Make sure that we have the right number of arguments
if (argCount == 2) {
if (!useContext) {
arg = FunctionUtils.getValuesListExpression(expressionVisitor, ctx, 0);
}
JsonNode searchVar = FunctionUtils.getValuesListExpression(expressionVisitor, ctx, useContext ? 0 : 1);
// if arg is an array, search for the variable and return its index. Any other
// type of input
// returns -1.
if (arg == null || searchVar == null) {
return new LongNode(-1);
} else if (arg.isArray()) {
ArrayNode array = (ArrayNode) arg;
// poor man's forEach
JsonNode val = null;
for (int i = 0; i < array.size(); i++) {
val = array.get(i);
if (val != null && val.equals(searchVar)) {
return new LongNode(i);
}
}
}
} else {
throw new EvaluateRuntimeException(
argCount == 0 ? ERR_BAD_CONTEXT : argCount == 1 ? ERR_ARG2BADTYPE : ERR_ARG3BADTYPE);
}
return new LongNode(-1);
}
@Override
public int getMaxArgs() {
return 2;
}
@Override
public int getMinArgs() {
return 1; // account for context variable
}
@Override
public String getSignature() {
// takes an array, and anything returns a number
return "";
}
}