~~~ /** * Copyright 2009-2019 the original author or authors. * * 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 org.apache.ibatis.scripting.xmltags; import java.lang.reflect.Array; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; import java.util.Map; import org.apache.ibatis.builder.BuilderException; /** * @author Clinton Begin */ public class ExpressionEvaluator { public boolean evaluateBoolean(String expression, Object parameterObject) { Object value = OgnlCache.getValue(expression, parameterObject); if (value instanceof Boolean) { return (Boolean) value; } if (value instanceof Number) { return new BigDecimal(String.valueOf(value)).compareTo(BigDecimal.ZERO) != 0; } return value != null; } public Iterable<?> evaluateIterable(String expression, Object parameterObject) { Object value = OgnlCache.getValue(expression, parameterObject); if (value == null) { throw new BuilderException("The expression '" + expression + "' evaluated to a null value."); } if (value instanceof Iterable) { return (Iterable<?>) value; } if (value.getClass().isArray()) { // the array may be primitive, so Arrays.asList() may throw // a ClassCastException (issue 209). Do the work manually // Curse primitives! :) (JGB) int size = Array.getLength(value); List<Object> answer = new ArrayList<>(); for (int i = 0; i < size; i++) { Object o = Array.get(value, i); answer.add(o); } return answer; } if (value instanceof Map) { return ((Map) value).entrySet(); } throw new BuilderException("Error evaluating expression '" + expression + "'. Return value (" + value + ") was not iterable."); } } ~~~