INT-6051 SpEL selection and projection may now be applied to arrays.
This commit is contained in:
Mark Fisher
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/*
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* Copyright 2002-2009 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.expression.spel;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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import java.util.ArrayList;
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import java.util.List;
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import org.junit.Test;
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import org.springframework.expression.EvaluationContext;
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import org.springframework.expression.Expression;
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import org.springframework.expression.TypedValue;
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import org.springframework.expression.spel.standard.SpelExpressionParser;
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import org.springframework.expression.spel.support.StandardEvaluationContext;
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/**
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* @author Mark Fisher
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* @since 3.0
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*/
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public class SelectionAndProjectionTests {
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@Test
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public void selectionWithList() throws Exception {
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Expression expression = new SpelExpressionParser().parse("integers.?[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ListTestBean());
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Object value = expression.getValue(context);
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assertTrue(value instanceof List);
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List list = (List) value;
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assertEquals(5, list.size());
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assertEquals(0, list.get(0));
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assertEquals(1, list.get(1));
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assertEquals(2, list.get(2));
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assertEquals(3, list.get(3));
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assertEquals(4, list.get(4));
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}
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@Test
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public void selectFirstItemInList() throws Exception {
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Expression expression = new SpelExpressionParser().parse("integers.^[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ListTestBean());
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Object value = expression.getValue(context);
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assertTrue(value instanceof Integer);
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assertEquals(0, value);
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}
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@Test
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public void selectLastItemInList() throws Exception {
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Expression expression = new SpelExpressionParser().parse("integers.$[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ListTestBean());
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Object value = expression.getValue(context);
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assertTrue(value instanceof Integer);
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assertEquals(4, value);
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}
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@Test
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public void selectionWithArray() throws Exception {
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Expression expression = new SpelExpressionParser().parse("integers.?[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
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Object value = expression.getValue(context);
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assertTrue(value.getClass().isArray());
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TypedValue typedValue = new TypedValue(value);
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assertEquals(Integer.class, typedValue.getTypeDescriptor().getElementType());
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Integer[] array = (Integer[]) value;
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assertEquals(5, array.length);
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assertEquals(new Integer(0), array[0]);
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assertEquals(new Integer(1), array[1]);
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assertEquals(new Integer(2), array[2]);
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assertEquals(new Integer(3), array[3]);
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assertEquals(new Integer(4), array[4]);
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}
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@Test
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public void selectFirstItemInArray() throws Exception {
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Expression expression = new SpelExpressionParser().parse("integers.^[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
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Object value = expression.getValue(context);
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assertTrue(value instanceof Integer);
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assertEquals(0, value);
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}
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@Test
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public void selectLastItemInArray() throws Exception {
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Expression expression = new SpelExpressionParser().parse("integers.$[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
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Object value = expression.getValue(context);
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assertTrue(value instanceof Integer);
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assertEquals(4, value);
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}
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@Test
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public void selectionWithPrimitiveArray() throws Exception {
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Expression expression = new SpelExpressionParser().parse("ints.?[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
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Object value = expression.getValue(context);
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assertTrue(value.getClass().isArray());
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TypedValue typedValue = new TypedValue(value);
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assertEquals(Integer.class, typedValue.getTypeDescriptor().getElementType());
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Integer[] array = (Integer[]) value;
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assertEquals(5, array.length);
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assertEquals(new Integer(0), array[0]);
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assertEquals(new Integer(1), array[1]);
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assertEquals(new Integer(2), array[2]);
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assertEquals(new Integer(3), array[3]);
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assertEquals(new Integer(4), array[4]);
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}
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@Test
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public void selectFirstItemInPrimitiveArray() throws Exception {
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Expression expression = new SpelExpressionParser().parse("ints.^[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
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Object value = expression.getValue(context);
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assertTrue(value instanceof Integer);
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assertEquals(0, value);
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}
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@Test
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public void selectLastItemInPrimitiveArray() throws Exception {
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Expression expression = new SpelExpressionParser().parse("ints.$[#this<5]");
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EvaluationContext context = new StandardEvaluationContext(new ArrayTestBean());
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Object value = expression.getValue(context);
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assertTrue(value instanceof Integer);
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assertEquals(4, value);
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}
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@Test
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public void projectionWithList() throws Exception {
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Expression expression = new SpelExpressionParser().parse("#testList.![wrapper.value]");
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EvaluationContext context = new StandardEvaluationContext();
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context.setVariable("testList", IntegerTestBean.createList());
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Object value = expression.getValue(context);
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assertTrue(value instanceof List);
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List list = (List) value;
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assertEquals(3, list.size());
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assertEquals(5, list.get(0));
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assertEquals(6, list.get(1));
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assertEquals(7, list.get(2));
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}
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@Test
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public void projectionWithArray() throws Exception {
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Expression expression = new SpelExpressionParser().parse("#testArray.![wrapper.value]");
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EvaluationContext context = new StandardEvaluationContext();
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context.setVariable("testArray", IntegerTestBean.createArray());
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Object value = expression.getValue(context);
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assertTrue(value.getClass().isArray());
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TypedValue typedValue = new TypedValue(value);
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assertEquals(Number.class, typedValue.getTypeDescriptor().getElementType());
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Number[] array = (Number[]) value;
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assertEquals(3, array.length);
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assertEquals(new Integer(5), array[0]);
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assertEquals(5.9f, array[1]);
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assertEquals(new Integer(7), array[2]);
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}
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static class ListTestBean {
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private final List<Integer> integers = new ArrayList<Integer>();
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ListTestBean() {
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for (int i = 0; i < 10; i++) {
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integers.add(i);
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}
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}
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public List<Integer> getIntegers() {
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return integers;
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}
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}
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static class ArrayTestBean {
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private final int[] ints = new int[10];
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private final Integer[] integers = new Integer[10];
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ArrayTestBean() {
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for (int i = 0; i < 10; i++) {
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ints[i] = i;
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integers[i] = i;
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}
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}
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public int[] getInts() {
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return ints;
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}
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public Integer[] getIntegers() {
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return integers;
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}
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}
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static class IntegerTestBean {
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private final IntegerWrapper wrapper;
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IntegerTestBean(Number value) {
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this.wrapper = new IntegerWrapper(value);
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}
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public IntegerWrapper getWrapper() {
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return this.wrapper;
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}
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static List<IntegerTestBean> createList() {
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List<IntegerTestBean> list = new ArrayList<IntegerTestBean>();
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for (int i = 0; i < 3; i++) {
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list.add(new IntegerTestBean(i + 5));
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}
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return list;
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}
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static IntegerTestBean[] createArray() {
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IntegerTestBean[] array = new IntegerTestBean[3];
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for (int i = 0; i < 3; i++) {
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if (i == 1) {
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array[i] = new IntegerTestBean(5.9f);
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}
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else {
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array[i] = new IntegerTestBean(i + 5);
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}
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}
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return array;
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}
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}
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static class IntegerWrapper {
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private final Number value;
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IntegerWrapper(Number value) {
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this.value = value;
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}
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public Number getValue() {
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return this.value;
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}
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}
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}
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