Example usage for java.lang Comparable compareTo

Introduction

In this page you can find the example usage for java.lang Comparable compareTo.

Prototype

public int compareTo(T o);

Source Link

Document

Compares this object with the specified object for order.

Usage

From source file:com.cyclopsgroup.waterview.utils.BeanPropertyComparator.java

/**
 * Overwrite or implement method compare()
 *
 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
 *///from  ww w  .  ja v a2 s .  c  om
public int compare(Object o1, Object o2) {
    try {
        Comparable p1 = (Comparable) PropertyUtils.getProperty(o1, propertyName);
        Comparable p2 = (Comparable) PropertyUtils.getProperty(o2, propertyName);
        return p1.compareTo(p2);
    } catch (Exception e) {
        return 0;
    }
}

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From source file:org.kineticsystem.commons.data.model.bean.BeanComparator.java

/**
 * Compare the two elements delegating the comparison to the specified
 * property.//from  w w w  .ja v  a 2  s .  c  om
 * @param obj1 The first element to compare.
 * @param obj2 The second element to compare.
 * @return An integer value as specified by the <tt>Comparator</tt>
 *     interface.
 * @see java.util.Comparator
 */
@SuppressWarnings("unchecked")
public int compare(Object obj1, Object obj2) {

    int i = 0;
    int comparison = 0;

    while ((comparison == 0) && (i < propertyNames.length)) {

        String propertyName = propertyNames[i++];

        try {
            Object v1 = PropertyUtils.getProperty(obj1, propertyName);
            Object v2 = PropertyUtils.getProperty(obj2, propertyName);

            if ((v1 instanceof Comparable) && (v2 instanceof Comparable)) {
                Comparable c1 = (Comparable) v1;
                Comparable c2 = (Comparable) v2;
                comparison = c1.compareTo(c2);
            }
        } catch (Exception ex) {
            logger.error(ex);
        }
    }

    return comparison;
}

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From source file:com.nzion.util.UtilMisc.java

public static <T> int compare(Comparable<T> obj1, T obj2) {
    if (obj1 == null) {
        if (obj2 == null) {
            return 0;
        } else {/*from w ww .  j a  v a2s.co  m*/
            return 1;
        }
    } else {
        return obj1.compareTo(obj2);
    }
}

---

From source file:com.intuit.tank.PropertyComparer.java

/**
 * @{inheritDoc/* ww w  . java 2s .co m*/
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public int compare(T src, T tgt) {
    int retVal = 0;
    if (src == null && tgt == null) {
        retVal = 0;
    } else if (src != null && tgt == null) {
        retVal = 1;
    } else if (src == null && tgt != null) {
        retVal = -1;
    } else {
        try {
            Object property = PropertyUtils.getProperty(src, propertyName);
            Object property2 = PropertyUtils.getProperty(tgt, propertyName);

            if (property == null && property2 == null) {
                retVal = 0;
            } else if (property == null && property2 != null) {
                retVal = -1;
            } else if (property != null && property2 == null) {
                retVal = 1;
            } else if (Comparable.class.isAssignableFrom(property.getClass())) {
                Comparable c1 = (Comparable) property;
                Comparable c2 = (Comparable) property2;
                retVal = c1.compareTo(c2);
            } else {
                retVal = property.toString().compareTo(property2.toString());
            }
        } catch (IllegalAccessException e) {
            throw new RuntimeException(
                    "Cannot access the method.  Possible error in setting the access type for the getter setters of "
                            + propertyName);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e.getMessage());
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("No getter/setter method found for " + propertyName);
        }
    }

    if (sortOrder == SortOrder.DESCENDING) {
        retVal = retVal * -1;
    }
    return retVal;
}

---

From source file:com.linkedin.pinot.core.segment.creator.impl.stats.AbstractColumnStatisticsCollector.java

void addressSorted(Object entry) {
    if (isSorted) {
        if (previousValue != null) {
            if (!entry.equals(previousValue) && previousValue != null) {
                final Comparable prevValue = (Comparable) previousValue;
                final Comparable origin = (Comparable) entry;
                if (origin.compareTo(prevValue) < 0) {
                    isSorted = false;//from   w  ww .j av a2s.c  o  m
                }
            }
        }
        previousValue = entry;
    }
}

---

From source file:com.vaadin.tests.tb3.AbstractTB3Test.java

/**
 * Asserts that {@literal a} is > {@literal b}
 *
 * @param message//from   www.  ja  v  a2 s.co m
 *            The message to include in the {@link AssertionError}
 * @param a
 * @param b
 * @throws AssertionError
 *             If comparison fails
 */
public static final <T> void assertGreater(String message, Comparable<T> a, T b) throws AssertionError {
    if (a.compareTo(b) > 0) {
        return;
    }
    throw new AssertionError(decorate(message, a, b));
}

---

From source file:com.vaadin.tests.tb3.AbstractTB3Test.java

/**
 * Asserts that {@literal a} is < {@literal b}
 *
 * @param message/*from   w w  w. j  a  v  a  2  s.c o m*/
 *            The message to include in the {@link AssertionError}
 * @param a
 * @param b
 * @throws AssertionError
 *             If comparison fails
 */
public static final <T> void assertLessThan(String message, Comparable<T> a, T b) throws AssertionError {
    if (a.compareTo(b) < 0) {
        return;
    }
    throw new AssertionError(decorate(message, a, b));
}

---

From source file:com.vaadin.tests.tb3.AbstractTB3Test.java

/**
 * Asserts that {@literal a} is >= {@literal b}
 *
 * @param message//from www  .j  a v a 2s  .c  om
 *            The message to include in the {@link AssertionError}
 * @param a
 * @param b
 * @throws AssertionError
 *             If comparison fails
 */
public static final <T> void assertGreaterOrEqual(String message, Comparable<T> a, T b) throws AssertionError {
    if (a.compareTo(b) >= 0) {
        return;
    }

    throw new AssertionError(decorate(message, a, b));
}

---

From source file:com.vaadin.tests.tb3.AbstractTB3Test.java

/**
 * Asserts that {@literal a} is <= {@literal b}
 *
 * @param message//from   ww  w. j  a  v  a2  s .  c o m
 *            The message to include in the {@link AssertionError}
 * @param a
 * @param b
 * @throws AssertionError
 *             If comparison fails
 */
public static final <T> void assertLessThanOrEqual(String message, Comparable<T> a, T b) throws AssertionError {
    if (a.compareTo(b) <= 0) {
        return;
    }

    throw new AssertionError(decorate(message, a, b));
}

---

From source file:org.rhq.enterprise.gui.legacy.taglib.display.BeanSorter.java

/**
 * Compares two objects by first fetching a property from each object and then comparing that value. If there are
 * any errors produced while trying to compare these objects then a RunTimeException will be thrown as any error
 * found here will most likely be a programming error that needs to be quickly addressed (like trying to compare
 * objects that are not comparable, or trying to read a property from a bean that is invalid, etc...)
 *
 * @throws RuntimeException if there are any problems making a comparison of the object properties.
 *//*from   w w  w .j a  v  a 2 s  .c o m*/

public int compare(Object o1, Object o2) throws RuntimeException {
    if (property == null) {
        throw new NullPointerException("Null property provided which " + "prevents BeanSorter sort");
    }

    try {
        Object p1 = null;
        Object p2 = null;

        // If they have supplied a decorator, then make sure and use it for
        // the sorting as well... TODO - Major hack....

        if (this.dec != null) {
            try {
                dec.initRow(o1, -1, -1);
                p1 = PropertyUtils.getProperty(dec, property);

                dec.initRow(o2, -1, -1);
                p2 = PropertyUtils.getProperty(dec, property);
            } catch (Exception e) {
                // If there were any problems, then assume that the decorator
                // does not implement that method, and instead fall down to
                // the original object...

                p1 = PropertyUtils.getProperty(o1, property);
                p2 = PropertyUtils.getProperty(o2, property);
            }
        } else {
            p1 = PropertyUtils.getProperty(o1, property);
            p2 = PropertyUtils.getProperty(o2, property);
        }

        if ((p1 instanceof Comparable) && (p2 instanceof Comparable)) {
            Comparable c1 = (Comparable) p1;
            Comparable c2 = (Comparable) p2;
            return c1.compareTo(c2);
        } else {
            throw new RuntimeException(
                    "Object returned by property \"" + property + "\" is not a Comparable object");
        }
    } catch (IllegalAccessException e) {
        throw new RuntimeException("IllegalAccessException thrown while " + "trying to fetch property \""
                + property + "\" during sort");
    } catch (InvocationTargetException e) {
        throw new RuntimeException("InvocationTargetException thrown while " + "trying to fetch property \""
                + property + "\" during sort");
    } catch (NoSuchMethodException e) {
        throw new RuntimeException("NoSuchMethodException thrown while " + "trying to fetch property \""
                + property + "\" during sort");
    }
}

---

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