commons-lang-1.0.1.jar - Apache Commons Lang
commons-lang-1.0.1.jar is the JAR file for Apache Commons Lang 1.0.1, which
provides a host of helper utilities for the java.lang API.
JAR File Size and Download Location:
File name: commons-lang-1.0.1.jar File size: 63980 bytes Date modified: 11/22/2002 Download: Apache Commons Lang Website
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⏎ org/apache/commons/lang/builder/CompareToBuilder.java
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.commons.lang.builder;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import org.apache.commons.lang.NumberUtils;
/**
* <code>CompareTo</code> generation routines.
* <p>
* This class provides methods to build a good <comde>compareTo()</code> method for any class.
* It is consistent with the <code>equals</code> and <code>hashcode</code> built
* with EqualsBuilder and HashCodeBuilder.
* <p>
* Two object that compare equal using equals should compare equals using
* compareTo.
* <p>
* All relevant fields should be included in the calculation of the comparison. Derived
* fields may be ignored. The same fields, in the same order, should be used in
* both <code>compareTo</code> and <code>equals</code>.
* <p>
* Typical use for the code is as follows:
*
* <pre>
* public int comapareTo(Object o) {
* MyClass rhs = (MyClass) o;
* return new CompareToBuilder()
* .append(field1, rhs.field1)
* .append(field2, rhs.field2)
* .appendb(field3, rhs.field3)
* .toComparison();
* }
* </pre>
* <p>
* Alternatively, there is a method that uses reflection to determine
* the fields to test. Because these fields are usually private, the method,
* <code>reflectionCompare</code>, uses <code>Field.setAccessible</code> to change
* the visibility of the fields. This will fail under a security manager,
* unless the appropriate permissions are set. It is also slower than testing
* explicitly.
* <p>
* A typical invocation for this method would look like:
* <pre>
* public int compareTo(Object o) {
* return CompareToBuilder.reflectionCompare(this, obj);
* }
* </pre>
* @author <a href="mailto:steve.downey@netfolio.com">Steve Downey</a>
* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
* @version $Id: CompareToBuilder.java,v 1.4 2002/09/28 10:44:51 scolebourne Exp $
*/
public class CompareToBuilder {
/**
* If the fields tested are equals.
*/
private int comparison;
/**
* Constructor for CompareToBuilder.
* Starts off assuming that the objects are equal.
* @see java.lang.Object#Object()
*/
public CompareToBuilder() {
super();
comparison = 0;
}
//-------------------------------------------------------------------------
/**
* This method uses reflection to determine the ordering between two objects.
* <p>
* It uses Field.setAccessible to gain access to private fields. This means
* that it will throw a security exception if run under a security manger, if
* the permissions are not set up.
* It is also not as efficient as testing explicitly.
* Transient members will be not be tested, as they are likely derived
* fields, and not part of the value of the object.
* Static fields will not be tested.
* @param lhs Left Hand Side
* @param rhs Right Hand Side
* @return a negative integer, zero, or a positive integer as this
* object is less than, equal to, or greater than the specified object.
* @throws NullPointerException if either (but not both) parameter is null
* @throws ClassCastException if the specified object's type prevents it
* from being compared to this Object.
*/
public static int reflectionCompare(Object lhs, Object rhs) {
return reflectionCompare(lhs, rhs, false);
}
/**
* This method uses reflection to determine if the two object are equal.
* <p>
* It uses Field.setAccessible to gain access to private fields. This means
* that it will throw a security exception if run under a security manger, if
* the permissions are not set up.
* It is also not as efficient as testing explicitly.
* If the TestTransients parameter is set to true, transient members will be
* tested, otherwise they are ignored, as they are likely derived fields, and
* not part of the value of the object.
* Static fields will not be tested.
*
* @param lhs Left Hand Side
* @param rhs Right Hand Side
* @param testTransients whether to include transient fields
* @return a negative integer, zero, or a positive integer as this
* object is less than, equal to, or greater than the specified object.
* @throws NullPointerException if either (but not both) parameter is null
* @throws ClassCastException if the specified object's type prevents it
* from being compared to this Object.
*/
public static int reflectionCompare(Object lhs, Object rhs,
boolean testTransients) {
if (lhs == rhs) {
return 0;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
Class c1 = lhs.getClass();
if (!c1.isInstance(rhs)) {
throw new ClassCastException();
}
Field[] fields = c1.getDeclaredFields();
Field.setAccessible(fields, true);
CompareToBuilder compareToBuilder = new CompareToBuilder();
for (int i = 0; i < fields.length && compareToBuilder.comparison == 0; ++i) {
Field f = fields[i];
if (testTransients || !Modifier.isTransient(f.getModifiers())) {
if (!Modifier.isStatic(f.getModifiers())) {
try {
compareToBuilder.append(f.get(lhs), f.get(rhs));
} catch (IllegalAccessException e) {
//this can't happen. Would get a Security exception instead
//throw a runtime exception in case the impossible happens.
throw new InternalError("Unexpected IllegalAccessException");
}
}
}
}
return compareToBuilder.toComparison();
}
//-------------------------------------------------------------------------
/** Test if two <code>Object</code>s are equal using either the
* <code>compareTo</code> method, or native comparison if the Objects are
* actually arrays.
* <p>
* The objects must be <code>Comparable</code>. If they are not, the method
* will throw a <code>ClassCastException</code>.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
* @throws ClassCastException if the specified object's type prevents it
* from being compared to this Object.
*/
public CompareToBuilder append(Object lhs, Object rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
Class lhsClass = lhs.getClass();
if (!lhsClass.isArray()) {
//the simple case, not an array, just test the element
comparison = ((Comparable) lhs).compareTo(rhs);
} else {
//'Switch' on type of array, to dispatch to the correct handler
// This handles multi dimensional arrays
if (lhs instanceof long[]) {
append((long[]) lhs, (long[]) rhs);
} else if (lhs instanceof int[]) {
append((int[]) lhs, (int[]) rhs);
} else if (lhs instanceof short[]) {
append((short[]) lhs, (short[]) rhs);
} else if (lhs instanceof char[]) {
append((char[]) lhs, (char[]) rhs);
} else if (lhs instanceof byte[]) {
append((byte[]) lhs, (byte[]) rhs);
} else if (lhs instanceof double[]) {
append((double[]) lhs, (double[]) rhs);
} else if (lhs instanceof float[]) {
append((float[]) lhs, (float[]) rhs);
} else if (lhs instanceof boolean[]) {
append((boolean[]) lhs, (boolean[]) rhs);
} else {
// Not an array of primitives
append((Object[]) lhs, (Object[]) rhs);
}
}
return this;
}
/**
* Test if two <code>long</code>s are <, > or ==.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(long lhs, long rhs) {
if (comparison != 0) {
return this;
}
comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
return this;
}
/**
* Test if two <code>int</code>s are <, > or ==.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(int lhs, int rhs) {
if (comparison != 0) {
return this;
}
comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
return this;
}
/**
* Test if two <code>short</code>s are <, > or ==.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(short lhs, short rhs) {
if (comparison != 0) {
return this;
}
comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
return this;
}
/**
* Test if two <code>char</code>s are <, > or ==.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(char lhs, char rhs) {
if (comparison != 0) {
return this;
}
comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
return this;
}
/**
* Test if two <code>byte</code>s are <, > or ==.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(byte lhs, byte rhs) {
if (comparison != 0) {
return this;
}
comparison = ((lhs < rhs) ? -1 : ((lhs > rhs) ? 1 : 0));
return this;
}
/**
* Test if two <code>double</code>s are <, > or ==. This handles NaNs,
* Infinties, and -0.0. It is compatible with the hash code generated by
* <code>HashCodeBuilder</code>.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(double lhs, double rhs) {
if (comparison != 0) {
return this;
}
comparison = NumberUtils.compare(lhs, rhs);
return this;
}
/**
* Test if two <code>double</code>s are <, > or ==. This handles NaNs,
* Infinties, and -0.0. It is compatible with the hash code generated by
* <code>HashCodeBuilder</code>.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(float lhs, float rhs) {
if (comparison != 0) {
return this;
}
comparison = NumberUtils.compare(lhs, rhs);
return this;
}
/**
* Test if two <code>booleans</code>s are <, > or ==.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
*/
public CompareToBuilder append(boolean lhs, boolean rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == false) {
comparison = -1;
} else {
comparison = +1;
}
return this;
}
/**
* Performs a deep comparison of two object arrays. This also will be
* called for the top level of multi-dimensional, ragged, and multi-typed
* arrays. If two arrays are of different lengths, and all elements of the
* shorter array are equal to the elements in the longer array, the longer
* array is the greater. This is dictionary, or lexical, ordering.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
* @throws ClassCastException if the specified object's type prevents it
* from being compared to this Object.
*/
public CompareToBuilder append(Object[] lhs, Object[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
Class lhsClass = lhs[i].getClass();
if (!lhsClass.isInstance(rhs[i])) {
throw new ClassCastException();
}
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>long</code> Length and all values
* are compared. The method append(long, long) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(long[] lhs, long[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>int</code> Length and all values
* are compared. The method append(int, int) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(int[] lhs, int[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>short</code> Length and all values
* are compared. The method append(short, short) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(short[] lhs, short[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>char</code> Length and all values
* are compared. The method append(char, char) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(char[] lhs, char[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>byte</code> Length and all values
* are compared. The method append(byte, byte) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(byte[] lhs, byte[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>double</code> Length and all values
* are compared. The method append(double, double) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(double[] lhs, double[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>float</code> Length and all values
* are compared. The method append(float, float) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(float[] lhs, float[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Deep comparison of array of <code>boolean</code> Length and all values
* are compared. The method append(boolean, boolean) is used.
* @param lhs - Left Hand Side
* @param rhs - Right Hand Side
* @return CompareToBuilder - used to chain calls.
* @throws NullPointerException if either (but not both) parameter is null
*/
public CompareToBuilder append(boolean[] lhs, boolean[] rhs) {
if (comparison != 0) {
return this;
}
if (lhs == rhs) {
return this;
}
if (lhs == null || rhs == null) {
throw new NullPointerException();
}
int length = (lhs.length < rhs.length) ? lhs.length : rhs.length;
for (int i = 0; i < length && comparison == 0; ++i) {
append(lhs[i], rhs[i]);
}
if (comparison == 0 && lhs.length != rhs.length) {
comparison = (lhs.length < rhs.length) ? -1 : +1;
}
return this;
}
/**
* Return a negative integer if the object is less than, a positive
* integer if the object is greater than, or 0 if the object is equal.
*
* @return int - a negative integer, zero, or a positive integer as this
* object is less than, equal to, or greater than the specified object.
*/
public int toComparison() {
return comparison;
}
}
⏎ org/apache/commons/lang/builder/CompareToBuilder.java
⇒ Using commons-lang3.jar in Java Programs
⇐ commons-lang-2.6.jar - Apache Commons Lang
2017-04-15, 20442👍, 0💬
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