Java tutorial
/* * Copyright (c) 2016 Santanu Sinha <santanu.sinha@gmail.com> * * 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 io.appform.jsonrules.expressions.string; import com.fasterxml.jackson.databind.JsonNode; import io.appform.jsonrules.ExpressionEvaluationContext; import io.appform.jsonrules.ExpressionType; import io.appform.jsonrules.expressions.JsonPathBasedExpression; import lombok.Builder; /** * Check is string is not empty or null */ public class NotEmptyExpression extends JsonPathBasedExpression { public NotEmptyExpression() { super(ExpressionType.not_empty); } @Builder public NotEmptyExpression(String path) { super(ExpressionType.not_empty, path); } @Override protected boolean evaluate(ExpressionEvaluationContext context, String path, JsonNode evaluatedNode) { if (!evaluatedNode.isTextual()) { return false; } final String data = evaluatedNode.asText(); return null != data && !data.isEmpty(); } }