com.repaskys.domain.ShortUrl.java Source code

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Here is the source code for com.repaskys.domain.ShortUrl.java

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/*
 * Copyright 2012 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 com.repaskys.domain;

import static javax.persistence.GenerationType.AUTO;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Transient;
import javax.validation.constraints.Size;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import org.hibernate.validator.constraints.NotBlank;
import org.hibernate.validator.constraints.URL;

import com.repaskys.url.algorithms.AlphaNumericCodec;
import com.repaskys.url.algorithms.Codec;

/**
 * This class is used to save URL's and their corresponding shortened code.
 *
 * @author Drew Repasky
 */
@Entity
public class ShortUrl implements Serializable {

    private static final long serialVersionUID = 7827630535667254219L;

    private static final Codec CODEC = new AlphaNumericCodec();
    private static final int MAX_URL_LENGTH = 500;

    /**
     * Helper method.
     * 
     * @see http://stackoverflow.com/questions/1590831/safely-casting-long-to-int-in-java
     */
    private static int safeLongToInt(long l) {
        if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
            throw new IllegalArgumentException(l + " cannot be cast to int without changing its value.");
        }
        return (int) l;
    }

    public static Long shortCodeToId(String shortCode) {
        int i = CODEC.decode(shortCode);
        return new Long(i);
    }

    @Id
    @GeneratedValue(strategy = AUTO)
    private Long id;

    @NotBlank(message = "Full URL {javax.validation.constraints.NotBlank.message}")
    @Size(max = MAX_URL_LENGTH, message = "Full URL {javax.validation.constraints.Size.message}")
    @URL
    private String fullUrl;

    public Long getId() {
        return this.id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFullUrl() {
        return this.fullUrl;
    }

    /**
     * A URL such as http://www.google.com
     */
    public void setFullUrl(String fullUrl) {
        this.fullUrl = fullUrl;
    }

    @Transient
    public String getShortUrl() {
        // FIXME precision can be lost
        int integerId = safeLongToInt(this.getId());
        return CODEC.encode(integerId);
    }

    @Override
    public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(this);
    }

    @Override
    public boolean equals(Object obj) {
        return EqualsBuilder.reflectionEquals(this, obj);
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
    }

}