Commons JXPath example source code file (BasicTypeConverterTest.java)

This example Commons JXPath source code file (BasicTypeConverterTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons JXPath tags/keywords

arraylist, basictypeconvertertest, can, earth, integer, integer, list, list, math, nodeset, object, object, reflection, string, string, testcase, util

The Commons JXPath BasicTypeConverterTest.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.commons.jxpath.util;

import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import junit.framework.TestCase;

import org.apache.commons.jxpath.NodeSet;
import org.apache.commons.jxpath.Pointer;

/**
 * Tests BasicTypeConverter
 * 
 * @author Dmitri Plotnikov
 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
 */
public class BasicTypeConverterTest extends TestCase {

    public void testPrimitiveToString() {
        assertConversion(new Integer(1), String.class, "1");
    }

    public void testArrayToList() {
        assertConversion(
            new int[] { 1, 2 },
            List.class,
            Arrays.asList(new Object[] { new Integer(1), new Integer(2)}));
    }

    public void testArrayToArray() {
        assertConversion(
            new int[] { 1, 2 },
            String[].class,
            Arrays.asList(new String[] { "1", "2" }));
    }

    public void testListToArray() {
        assertConversion(
            Arrays.asList(new Integer[] { new Integer(1), new Integer(2)}),
            String[].class,
            Arrays.asList(new String[] { "1", "2" }));

        assertConversion(
            Arrays.asList(new String[] { "1", "2" }),
            int[].class,
            Arrays.asList(new Integer[] { new Integer(1), new Integer(2)}));
    }

    public void testInvalidConversion() {
        boolean exception = false;
        try {
            TypeUtils.convert("'foo'", Date.class);
        }
        catch (Throwable ex) {
            exception = true;
        }
        assertTrue("Type conversion exception", exception);
    }

    public void assertConversion(Object from, Class toType, Object expected) {
        boolean can = TypeUtils.canConvert(from, toType);
        assertTrue("Can convert: " + from.getClass() + " to " + toType, can);
        Object result = TypeUtils.convert(from, toType);
        if (result.getClass().isArray()) {
            ArrayList list = new ArrayList();
            for (int j = 0; j < Array.getLength(result); j++) {
                list.add(Array.get(result, j));
            }
            result = list;
        }
        assertEquals(
            "Convert: " + from.getClass() + " to " + toType,
            expected,
            result);
    }
    
    public void testSingletonCollectionToString() {
        assertConversion(Collections.singleton("Earth"), String.class, "Earth");
    }

    public void testSingletonArrayToString() {
        assertConversion(new String[] { "Earth" }, String.class, "Earth");
    }

    public void testPointerToString() {
        assertConversion(new Pointer() {
            public Object getValue() {
                return "value";
            }
            public Object getNode() {
                return null;
            }
            public void setValue(Object value) {
            }
            public Object getRootNode() {
                return null;
            }
            public String asPath() {
                return null;
            }
            public Object clone() {
                return null;
            }
            public int compareTo(Object o) {
                return 0;
            }
        }, String.class, "value");
    }

    public void testNodeSetToString() {
        assertConversion(new NodeSet() {
            public List getNodes() {
                return null;
            }
            public List getPointers() {
                return null;
            }
            public List getValues() {
                List list = new ArrayList();
                list.add("hello");
                list.add("goodbye");
                return Collections.singletonList(list);
            }
        }, String.class, "hello");
    }

    // succeeds in current version
    public void testNodeSetToInteger() {
        assertConversion(new NodeSet() {
            public List getNodes() {
                return null;
            }
            public List getPointers() {
                return null;
            }
            public List getValues() {
                return Collections.singletonList("9");
            }
        }, Integer.class, new Integer(9));
    }    
    
    public void testBeanUtilsConverter() {
        assertConversion("12", BigDecimal.class, new BigDecimal(12));
    }
}