alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

ActiveMQ example source code file (TypeConversionSupport.java)

This example ActiveMQ source code file (TypeConversionSupport.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 - ActiveMQ tags/keywords

class, class, conversion_map, conversionkey, conversionkey, converter, converter, hashmap, object, object, typeconversionsupport, util

The ActiveMQ TypeConversionSupport.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.activemq.util;

import java.util.Date;
import java.util.HashMap;

import org.apache.activemq.command.ActiveMQDestination;

public final class TypeConversionSupport {

    static class ConversionKey {
        final Class from;
        final Class to;
        final int hashCode;

        public ConversionKey(Class from, Class to) {
            this.from = from;
            this.to = to;
            this.hashCode = from.hashCode() ^ (to.hashCode() << 1);
        }

        public boolean equals(Object o) {
            ConversionKey x = (ConversionKey)o;
            return x.from == from && x.to == to;
        }

        public int hashCode() {
            return hashCode;
        }
    }

    interface Converter {
        Object convert(Object value);
    }

    private static final HashMap<ConversionKey, Converter> CONVERSION_MAP = new HashMap();
    static {
        Converter toStringConverter = new Converter() {
            public Object convert(Object value) {
                return value.toString();
            }
        };
        CONVERSION_MAP.put(new ConversionKey(Boolean.class, String.class), toStringConverter);
        CONVERSION_MAP.put(new ConversionKey(Byte.class, String.class), toStringConverter);
        CONVERSION_MAP.put(new ConversionKey(Short.class, String.class), toStringConverter);
        CONVERSION_MAP.put(new ConversionKey(Integer.class, String.class), toStringConverter);
        CONVERSION_MAP.put(new ConversionKey(Long.class, String.class), toStringConverter);
        CONVERSION_MAP.put(new ConversionKey(Float.class, String.class), toStringConverter);
        CONVERSION_MAP.put(new ConversionKey(Double.class, String.class), toStringConverter);

        CONVERSION_MAP.put(new ConversionKey(String.class, Boolean.class), new Converter() {
            public Object convert(Object value) {
                return Boolean.valueOf((String)value);
            }
        });
        CONVERSION_MAP.put(new ConversionKey(String.class, Byte.class), new Converter() {
            public Object convert(Object value) {
                return Byte.valueOf((String)value);
            }
        });
        CONVERSION_MAP.put(new ConversionKey(String.class, Short.class), new Converter() {
            public Object convert(Object value) {
                return Short.valueOf((String)value);
            }
        });
        CONVERSION_MAP.put(new ConversionKey(String.class, Integer.class), new Converter() {
            public Object convert(Object value) {
                return Integer.valueOf((String)value);
            }
        });
        CONVERSION_MAP.put(new ConversionKey(String.class, Long.class), new Converter() {
            public Object convert(Object value) {
                return Long.valueOf((String)value);
            }
        });
        CONVERSION_MAP.put(new ConversionKey(String.class, Float.class), new Converter() {
            public Object convert(Object value) {
                return Float.valueOf((String)value);
            }
        });
        CONVERSION_MAP.put(new ConversionKey(String.class, Double.class), new Converter() {
            public Object convert(Object value) {
                return Double.valueOf((String)value);
            }
        });

        Converter longConverter = new Converter() {
            public Object convert(Object value) {
                return Long.valueOf(((Number)value).longValue());
            }
        };
        CONVERSION_MAP.put(new ConversionKey(Byte.class, Long.class), longConverter);
        CONVERSION_MAP.put(new ConversionKey(Short.class, Long.class), longConverter);
        CONVERSION_MAP.put(new ConversionKey(Integer.class, Long.class), longConverter);
        CONVERSION_MAP.put(new ConversionKey(Date.class, Long.class), new Converter() {
            public Object convert(Object value) {
                return Long.valueOf(((Date)value).getTime());
            }
        });

        Converter intConverter = new Converter() {
            public Object convert(Object value) {
                return Integer.valueOf(((Number)value).intValue());
            }
        };
        CONVERSION_MAP.put(new ConversionKey(Byte.class, Integer.class), intConverter);
        CONVERSION_MAP.put(new ConversionKey(Short.class, Integer.class), intConverter);

        CONVERSION_MAP.put(new ConversionKey(Byte.class, Short.class), new Converter() {
            public Object convert(Object value) {
                return Short.valueOf(((Number)value).shortValue());
            }
        });

        CONVERSION_MAP.put(new ConversionKey(Float.class, Double.class), new Converter() {
            public Object convert(Object value) {
                return new Double(((Number)value).doubleValue());
            }
        });
        CONVERSION_MAP.put(new ConversionKey(String.class, ActiveMQDestination.class), new Converter() {
            public Object convert(Object value) {
                return ActiveMQDestination.createDestination((String)value, ActiveMQDestination.QUEUE_TYPE);
            }
        });
    }

    private TypeConversionSupport() {
    }

    public static Object convert(Object value, Class clazz) {

        assert value != null && clazz != null;

        if (value.getClass() == clazz) {
            return value;
        }

        Converter c = CONVERSION_MAP.get(new ConversionKey(value.getClass(), clazz));
        if (c == null) {
            return null;
        }
        return c.convert(value);

    }

}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ TypeConversionSupport.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.