dart/compiler/java/com/google/dart/compiler/util/apache/ObjectUtils.java - Issue 20722006: Removed compiler/ directory from repository

Unified Diff: dart/compiler/java/com/google/dart/compiler/util/apache/ObjectUtils.java

Issue 20722006: Removed compiler/ directory from repository (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge

Patch Set: Created 7 years, 5 months ago

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Index: dart/compiler/java/com/google/dart/compiler/util/apache/ObjectUtils.java

diff --git a/dart/compiler/java/com/google/dart/compiler/util/apache/ObjectUtils.java b/dart/compiler/java/com/google/dart/compiler/util/apache/ObjectUtils.java

deleted file mode 100644

index 04636bbf455924c76cf47892b7e0c09b09cd30bb..0000000000000000000000000000000000000000

--- a/dart/compiler/java/com/google/dart/compiler/util/apache/ObjectUtils.java

+++ /dev/null

@@ -1,615 +0,0 @@

-// BSD-style license that can be found in the LICENSE file.

-/*

- * 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 com.google.dart.compiler.util.apache;

-import com.google.dart.compiler.util.apache.exception.CloneFailedException;

-import com.google.dart.compiler.util.apache.mutable.MutableInt;

-import java.io.Serializable;

-import java.lang.reflect.Array;

-import java.lang.reflect.InvocationTargetException;

-import java.lang.reflect.Method;

-import java.util.Collections;

-import java.util.Comparator;

-import java.util.HashMap;

-import java.util.Map;

-import java.util.TreeSet;

-/**

- * Operations on {@code Object}.

- *

- * This class tries to handle {@code null} input gracefully.

- * An exception will generally not be thrown for a {@code null} input.

- * Each method documents its behaviour in more detail.

- *

- * NOTICE: This file is modified copy of its original Apache library.

- * It was moved to the different package, and changed to reduce number of dependencies.

- *

- * #ThreadSafe#

- * @since 1.0

- * @version $Id: ObjectUtils.java 1199894 2011-11-09 17:53:59Z ggregory $

- */

-//@Immutable

-public class ObjectUtils {

- /**

- * Singleton used as a {@code null} placeholder where

- * {@code null} has another meaning.

- *

- * For example, in a {@code HashMap} the

- * {@link java.util.HashMap#get(java.lang.Object)} method returns

- * {@code null} if the {@code Map} contains {@code null} or if there

- * is no matching key. The {@code Null} placeholder can be used to

- * distinguish between these two cases.

- *

- * Another example is {@code Hashtable}, where {@code null}

- * cannot be stored.

- *

- * This instance is Serializable.

- */

- public static final Null NULL = new Null();

- /**

- * {@code ObjectUtils} instances should NOT be constructed in

- * standard programming. Instead, the static methods on the class should

- * be used, such as {@code ObjectUtils.defaultIfNull("a","b");}.

- *

- * This constructor is public to permit tools that require a JavaBean

- * instance to operate.

- */

- public ObjectUtils() {

- super();

- }

- // Defaulting

- //-----------------------------------------------------------------------

- /**

- * Returns a default value if the object passed is {@code null}.

- *

- * <pre>

- * ObjectUtils.defaultIfNull(null, null) = null

- * ObjectUtils.defaultIfNull(null, "") = ""

- * ObjectUtils.defaultIfNull(null, "zz") = "zz"

- * ObjectUtils.defaultIfNull("abc", *) = "abc"

- * ObjectUtils.defaultIfNull(Boolean.TRUE, *) = Boolean.TRUE

- * </pre>

- *

- * @param <T> the type of the object

- * @param object the {@code Object} to test, may be {@code null}

- * @param defaultValue the default value to return, may be {@code null}

- * @return {@code object} if it is not {@code null}, defaultValue otherwise

- */

- public static <T> T defaultIfNull(T object, T defaultValue) {

- return object != null ? object : defaultValue;

- }

- /**

- * Returns the first value in the array which is not {@code null}.

- * If all the values are {@code null} or the array is {@code null}

- * or empty then {@code null} is returned.

- *

- * <pre>

- * ObjectUtils.firstNonNull(null, null) = null

- * ObjectUtils.firstNonNull(null, "") = ""

- * ObjectUtils.firstNonNull(null, null, "") = ""

- * ObjectUtils.firstNonNull(null, "zz") = "zz"

- * ObjectUtils.firstNonNull("abc", *) = "abc"

- * ObjectUtils.firstNonNull(null, "xyz", *) = "xyz"

- * ObjectUtils.firstNonNull(Boolean.TRUE, *) = Boolean.TRUE

- * ObjectUtils.firstNonNull() = null

- * </pre>

- *

- * @param <T> the component type of the array

- * @param values the values to test, may be {@code null} or empty

- * @return the first value from {@code values} which is not {@code null},

- * or {@code null} if there are no non-null values

- * @since 3.0

- */

- public static <T> T firstNonNull(T... values) {

- if (values != null) {

- for (T val : values) {

- if (val != null) {

- return val;

- }

- return null;

- }

- // Null-safe equals/hashCode

- //-----------------------------------------------------------------------

- /**

- * Compares two objects for equality, where either one or both

- * objects may be {@code null}.

- *

- * <pre>

- * ObjectUtils.equals(null, null) = true

- * ObjectUtils.equals(null, "") = false

- * ObjectUtils.equals("", null) = false

- * ObjectUtils.equals("", "") = true

- * ObjectUtils.equals(Boolean.TRUE, null) = false

- * ObjectUtils.equals(Boolean.TRUE, "true") = false

- * ObjectUtils.equals(Boolean.TRUE, Boolean.TRUE) = true

- * ObjectUtils.equals(Boolean.TRUE, Boolean.FALSE) = false

- * </pre>

- *

- * @param object1 the first object, may be {@code null}

- * @param object2 the second object, may be {@code null}

- * @return {@code true} if the values of both objects are the same

- */

- public static boolean equals(Object object1, Object object2) {

- if (object1 == object2) {

- return true;

- }

- if (object1 == null || object2 == null) {

- return false;

- }

- return object1.equals(object2);

- }

- /**

- * Compares two objects for inequality, where either one or both

- * objects may be {@code null}.

- *

- * <pre>

- * ObjectUtils.notEqual(null, null) = false

- * ObjectUtils.notEqual(null, "") = true

- * ObjectUtils.notEqual("", null) = true

- * ObjectUtils.notEqual("", "") = false

- * ObjectUtils.notEqual(Boolean.TRUE, null) = true

- * ObjectUtils.notEqual(Boolean.TRUE, "true") = true

- * ObjectUtils.notEqual(Boolean.TRUE, Boolean.TRUE) = false

- * ObjectUtils.notEqual(Boolean.TRUE, Boolean.FALSE) = true

- * </pre>

- *

- * @param object1 the first object, may be {@code null}

- * @param object2 the second object, may be {@code null}

- * @return {@code false} if the values of both objects are the same

- */

- public static boolean notEqual(Object object1, Object object2) {

- return ObjectUtils.equals(object1, object2) == false;

- }

- /**

- * Gets the hash code of an object returning zero when the

- * object is {@code null}.

- *

- * <pre>

- * ObjectUtils.hashCode(null) = 0

- * ObjectUtils.hashCode(obj) = obj.hashCode()

- * </pre>

- *

- * @param obj the object to obtain the hash code of, may be {@code null}

- * @return the hash code of the object, or zero if null

- * @since 2.1

- */

- public static int hashCode(Object obj) {

- // hashCode(Object) retained for performance, as hash code is often critical

- return obj == null ? 0 : obj.hashCode();

- }

- /**

- * Gets the hash code for multiple objects.

- *

- * This allows a hash code to be rapidly calculated for a number of objects.

- * The hash code for a single object is the not same as {@link #hashCode(Object)}.

- * The hash code for multiple objects is the same as that calculated by an

- * {@code ArrayList} containing the specified objects.

- *

- * <pre>

- * ObjectUtils.hashCodeMulti() = 1

- * ObjectUtils.hashCodeMulti((Object[]) null) = 1

- * ObjectUtils.hashCodeMulti(a) = 31 + a.hashCode()

- * ObjectUtils.hashCodeMulti(a,b) = (31 + a.hashCode()) * 31 + b.hashCode()

- * ObjectUtils.hashCodeMulti(a,b,c) = ((31 + a.hashCode()) * 31 + b.hashCode()) * 31 + c.hashCode()

- * </pre>

- *

- * @param objects the objects to obtain the hash code of, may be {@code null}

- * @return the hash code of the objects, or zero if null

- * @since 3.0

- */

- public static int hashCodeMulti(Object... objects) {

- int hash = 1;

- if (objects != null) {

- for (Object object : objects) {

- hash = hash * 31 + ObjectUtils.hashCode(object);

- }

- return hash;

- }

- // Identity ToString

- //-----------------------------------------------------------------------

- /**

- * Gets the toString that would be produced by {@code Object}

- * if a class did not override toString itself. {@code null}

- * will return {@code null}.

- *

- * <pre>

- * ObjectUtils.identityToString(null) = null

- * ObjectUtils.identityToString("") = "java.lang.String@1e23"

- * ObjectUtils.identityToString(Boolean.TRUE) = "java.lang.Boolean@7fa"

- * </pre>

- *

- * @param object the object to create a toString for, may be

- * {@code null}

- * @return the default toString text, or {@code null} if

- * {@code null} passed in

- */

- public static String identityToString(Object object) {

- if (object == null) {

- return null;

- }

- StringBuffer buffer = new StringBuffer();

- identityToString(buffer, object);

- return buffer.toString();

- }

- /**

- * Appends the toString that would be produced by {@code Object}

- * if a class did not override toString itself. {@code null}

- * will throw a NullPointerException for either of the two parameters.

- *

- * <pre>

- * ObjectUtils.identityToString(buf, "") = buf.append("java.lang.String@1e23"

- * ObjectUtils.identityToString(buf, Boolean.TRUE) = buf.append("java.lang.Boolean@7fa"

- * ObjectUtils.identityToString(buf, Boolean.TRUE) = buf.append("java.lang.Boolean@7fa")

- * </pre>

- *

- * @param buffer the buffer to append to

- * @param object the object to create a toString for

- * @since 2.4

- */

- public static void identityToString(StringBuffer buffer, Object object) {

- if (object == null) {

- throw new NullPointerException("Cannot get the toString of a null identity");

- }

- buffer.append(object.getClass().getName())

- .append('@')

- .append(Integer.toHexString(System.identityHashCode(object)));

- }

- // ToString

- //-----------------------------------------------------------------------

- /**

- * Gets the {@code toString} of an {@code Object} returning

- * an empty string ("") if {@code null} input.

- *

- * <pre>

- * ObjectUtils.toString(null) = ""

- * ObjectUtils.toString("") = ""

- * ObjectUtils.toString("bat") = "bat"

- * ObjectUtils.toString(Boolean.TRUE) = "true"

- * </pre>

- *

- * @see StringUtils#defaultString(String)

- * @see String#valueOf(Object)

- * @param obj the Object to {@code toString}, may be null

- * @return the passed in Object's toString, or nullStr if {@code null} input

- * @since 2.0

- */

- public static String toString(Object obj) {

- return obj == null ? "" : obj.toString();

- }

- /**

- * Gets the {@code toString} of an {@code Object} returning

- * a specified text if {@code null} input.

- *

- * <pre>

- * ObjectUtils.toString(null, null) = null

- * ObjectUtils.toString(null, "null") = "null"

- * ObjectUtils.toString("", "null") = ""

- * ObjectUtils.toString("bat", "null") = "bat"

- * ObjectUtils.toString(Boolean.TRUE, "null") = "true"

- * </pre>

- *

- * @see StringUtils#defaultString(String,String)

- * @see String#valueOf(Object)

- * @param obj the Object to {@code toString}, may be null

- * @param nullStr the String to return if {@code null} input, may be null

- * @return the passed in Object's toString, or nullStr if {@code null} input

- * @since 2.0

- */

- public static String toString(Object obj, String nullStr) {

- return obj == null ? nullStr : obj.toString();

- }

- // Comparable

- //-----------------------------------------------------------------------

- /**

- * Null safe comparison of Comparables.

- *

- * @param <T> type of the values processed by this method

- * @param values the set of comparable values, may be null

- * @return

- * <ul>

- * <li>If any objects are non-null and unequal, the lesser object.

- * <li>If all objects are non-null and equal, the first.

- * <li>If any of the comparables are null, the lesser of the non-null objects.

- * <li>If all the comparables are null, null is returned.

- * </ul>

- */

- public static <T extends Comparable<? super T>> T min(T... values) {

- T result = null;

- if (values != null) {

- for (T value : values) {

- if (compare(value, result, true) < 0) {

- result = value;

- }

- return result;

- }

- /**

- * Null safe comparison of Comparables.

- *

- * @param <T> type of the values processed by this method

- * @param values the set of comparable values, may be null

- * @return

- * <ul>

- * <li>If any objects are non-null and unequal, the greater object.

- * <li>If all objects are non-null and equal, the first.

- * <li>If any of the comparables are null, the greater of the non-null objects.

- * <li>If all the comparables are null, null is returned.

- * </ul>

- */

- public static <T extends Comparable<? super T>> T max(T... values) {

- T result = null;

- if (values != null) {

- for (T value : values) {

- if (compare(value, result, false) > 0) {

- result = value;

- }

- return result;

- }

- /**

- * Null safe comparison of Comparables.

- * {@code null} is assumed to be less than a non-{@code null} value.

- *

- * @param <T> type of the values processed by this method

- * @param c1 the first comparable, may be null

- * @param c2 the second comparable, may be null

- * @return a negative value if c1 < c2, zero if c1 = c2

- * and a positive value if c1 > c2

- */

- public static <T extends Comparable<? super T>> int compare(T c1, T c2) {

- return compare(c1, c2, false);

- }

- /**

- * Null safe comparison of Comparables.

- *

- * @param <T> type of the values processed by this method

- * @param c1 the first comparable, may be null

- * @param c2 the second comparable, may be null

- * @param nullGreater if true {@code null} is considered greater

- * than a non-{@code null} value or if false {@code null} is

- * considered less than a Non-{@code null} value

- * @return a negative value if c1 < c2, zero if c1 = c2

- * and a positive value if c1 > c2

- * @see java.util.Comparator#compare(Object, Object)

- */

- public static <T extends Comparable<? super T>> int compare(T c1, T c2, boolean nullGreater) {

- if (c1 == c2) {

- return 0;

- } else if (c1 == null) {

- return nullGreater ? 1 : -1;

- } else if (c2 == null) {

- return nullGreater ? -1 : 1;

- }

- return c1.compareTo(c2);

- }

- /**

- * Find the "best guess" middle value among comparables. If there is an even

- * number of total values, the lower of the two middle values will be returned.

- * @param <T> type of values processed by this method

- * @param items to compare

- * @return T at middle position

- * @throws NullPointerException if items is {@code null}

- * @throws IllegalArgumentException if items is empty or contains {@code null} values

- * @since 3.0.1

- */

- public static <T extends Comparable<? super T>> T median(T... items) {

-// Validate.notEmpty(items);

-// Validate.noNullElements(items);

- TreeSet<T> sort = new TreeSet<T>();

- Collections.addAll(sort, items);

- @SuppressWarnings("unchecked") //we know all items added were T instances

- T result = (T) sort.toArray()[(sort.size() - 1) / 2];

- return result;

- }

- /**

- * Find the "best guess" middle value among comparables. If there is an even

- * number of total values, the lower of the two middle values will be returned.

- * @param <T> type of values processed by this method

- * @param comparator to use for comparisons

- * @param items to compare

- * @return T at middle position

- * @throws NullPointerException if items or comparator is {@code null}

- * @throws IllegalArgumentException if items is empty or contains {@code null} values

- * @since 3.0.1

- */

- public static <T> T median(Comparator<T> comparator, T... items) {

-// Validate.notEmpty(items, "null/empty items");

-// Validate.noNullElements(items);

-// Validate.notNull(comparator, "null comparator");

- TreeSet<T> sort = new TreeSet<T>(comparator);

- Collections.addAll(sort, items);

- @SuppressWarnings("unchecked") //we know all items added were T instances

- T result = (T) sort.toArray()[(sort.size() - 1) / 2];

- return result;

- }

- // Mode

- //-----------------------------------------------------------------------

- /**

- * Find the most frequently occurring item.

- *

- * @param <T> type of values processed by this method

- * @param items to check

- * @return most populous T, {@code null} if non-unique or no items supplied

- * @since 3.0.1

- */

- public static <T> T mode(T... items) {

- if (ArrayUtils.isNotEmpty(items)) {

- HashMap<T, MutableInt> occurrences = new HashMap<T, MutableInt>(items.length);

- for (T t : items) {

- MutableInt count = occurrences.get(t);

- if (count == null) {

- occurrences.put(t, new MutableInt(1));

- } else {

- count.increment();

- }

- T result = null;

- int max = 0;

- for (Map.Entry<T, MutableInt> e : occurrences.entrySet()) {

- int cmp = e.getValue().intValue();

- if (cmp == max) {

- result = null;

- } else if (cmp > max) {

- max = cmp;

- result = e.getKey();

- }

- return result;

- }

- return null;

- }

- // cloning

- //-----------------------------------------------------------------------

- /**

- * Clone an object.

- *

- * @param <T> the type of the object

- * @param obj the object to clone, null returns null

- * @return the clone if the object implements {@link Cloneable} otherwise {@code null}

- * @throws CloneFailedException if the object is cloneable and the clone operation fails

- * @since 3.0

- */

- public static <T> T clone(final T obj) {

- if (obj instanceof Cloneable) {

- final Object result;

- if (obj.getClass().isArray()) {

- final Class<?> componentType = obj.getClass().getComponentType();

- if (!componentType.isPrimitive()) {

- result = ((Object[]) obj).clone();

- } else {

- int length = Array.getLength(obj);

- result = Array.newInstance(componentType, length);

- while (length-- > 0) {

- Array.set(result, length, Array.get(obj, length));

- }

- } else {

- try {

- final Method clone = obj.getClass().getMethod("clone");

- result = clone.invoke(obj);

- } catch (final NoSuchMethodException e) {

- throw new CloneFailedException("Cloneable type "

- + obj.getClass().getName()

- + " has no clone method", e);

- } catch (final IllegalAccessException e) {

- throw new CloneFailedException("Cannot clone Cloneable type "

- + obj.getClass().getName(), e);

- } catch (final InvocationTargetException e) {

- throw new CloneFailedException("Exception cloning Cloneable type "

- + obj.getClass().getName(), e.getCause());

- }

- @SuppressWarnings("unchecked")

- final T checked = (T) result;

- return checked;

- }

- return null;

- }

- /**

- * Clone an object if possible.

- *

- * This method is similar to {@link #clone(Object)}, but will return the provided

- * instance as the return value instead of {@code null} if the instance

- * is not cloneable. This is more convenient if the caller uses different

- * implementations (e.g. of a service) and some of the implementations do not allow concurrent

- * processing or have state. In such cases the implementation can simply provide a proper

- * clone implementation and the caller's code does not have to change.

- *

- * @param <T> the type of the object

- * @param obj the object to clone, null returns null

- * @return the clone if the object implements {@link Cloneable} otherwise the object itself

- * @throws CloneFailedException if the object is cloneable and the clone operation fails

- * @since 3.0

- */

- public static <T> T cloneIfPossible(final T obj) {

- final T clone = clone(obj);

- return clone == null ? obj : clone;

- }

- // Null

- //-----------------------------------------------------------------------

- /**

- * Class used as a null placeholder where {@code null}

- * has another meaning.

- *

- * For example, in a {@code HashMap} the

- * {@link java.util.HashMap#get(java.lang.Object)} method returns

- * {@code null} if the {@code Map} contains {@code null} or if there is

- * no matching key. The {@code Null} placeholder can be used to distinguish

- * between these two cases.

- *

- * Another example is {@code Hashtable}, where {@code null}

- * cannot be stored.

- */

- public static class Null implements Serializable {

- /**

- * Required for serialization support. Declare serialization compatibility with Commons Lang 1.0

- *

- * @see java.io.Serializable

- */

- private static final long serialVersionUID = 7092611880189329093L;

- /**

- * Restricted constructor - singleton.

- */

- Null() {

- super();

- }

- /**

- * Ensure singleton.

- *

- * @return the singleton value

- */

- private Object readResolve() {

- return ObjectUtils.NULL;

- }