Java tutorial
/******************************************************************************* * Copyright (c) 2014 BitRangers (Team C1). * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * BitRangers (Team C1) - initial API and implementation ******************************************************************************/ /* * Copyright 2002-2013 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.bitranger.parknshop.util; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.lang.reflect.Array; import java.util.Arrays; /** * Miscellaneous object utility methods. * * <p>Mainly for internal use within the framework; consider * <a href="http://jakarta.apache.org/commons/lang/">Jakarta's Commons Lang</a> * for a more comprehensive suite of object utilities. * * <p>Thanks to Alex Ruiz for contributing several enhancements to this class! * * @author Juergen Hoeller * @author Keith Donald * @author Rod Johnson * @author Rob Harrop * @author Chris Beams * * @author BowenCai * * @since 19.03.2004 * @see org.apache.commons.lang.ObjectUtils */ public abstract class ObjUtils { public static byte[] toBytes(Object obj) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); ObjectOutputStream objOut = null; byte[] plainObj = null; try { objOut = new ObjectOutputStream(baos); objOut.writeObject(obj); plainObj = baos.toByteArray(); } catch (IOException e) { throw new RuntimeException(e.getMessage() + "\n\tCAUSE: " + e.getCause(), e); } finally { try { baos.close(); if (objOut != null) { objOut.close(); } } catch (IOException e) { throw new RuntimeException(e.getMessage() + "\n\tCAUSE: " + e.getCause(), e); } } return plainObj; } public static Object fromBytes(byte[] plainObj) { Object var = null; ByteArrayInputStream baIS = new ByteArrayInputStream(plainObj); ObjectInputStream objIS = null; try { objIS = new ObjectInputStream(baIS); var = objIS.readObject(); } catch (Exception e) { throw new RuntimeException(e.getMessage() + "\n\tCAUSE: " + e.getCause(), e); } finally { try { baIS.close(); if (objIS != null) { objIS.close(); } } catch (IOException e) { throw new RuntimeException(e.getMessage() + "\n\tCAUSE: " + e.getCause(), e); } } return var; } private static final int INITIAL_HASH = 7; private static final int MULTIPLIER = 31; private static final String EMPTY_STRING = ""; private static final String NULL_STRING = "null"; private static final String ARRAY_START = "{"; private static final String ARRAY_END = "}"; private static final String EMPTY_ARRAY = ARRAY_START + ARRAY_END; private static final String ARRAY_ELEMENT_SEPARATOR = ", "; /** * Return whether the given throwable is a checked exception: * that is, neither a RuntimeException nor an Error. * @param ex the throwable to check * @return whether the throwable is a checked exception * @see java.lang.Exception * @see java.lang.RuntimeException * @see java.lang.Error */ public static boolean isCheckedException(Throwable ex) { return !(ex instanceof RuntimeException || ex instanceof Error); } /** * Check whether the given exception is compatible with the exceptions * declared in a throws clause. * @param ex the exception to checked * @param declaredExceptions the exceptions declared in the throws clause * @return whether the given exception is compatible */ @SuppressWarnings({ "unchecked", "rawtypes" }) public static boolean isCompatibleWithThrowsClause(Throwable ex, Class[] declaredExceptions) { if (!isCheckedException(ex)) { return true; } if (declaredExceptions != null) { int i = 0; while (i < declaredExceptions.length) { if (declaredExceptions[i].isAssignableFrom(ex.getClass())) { return true; } i++; } } return false; } /** * Determine whether the given object is an array: * either an Object array or a primitive array. * @param obj the object to check */ public static boolean isArray(Object obj) { return (obj != null && obj.getClass().isArray()); } /** * Determine whether the given array is empty: * i.e. {@code null} or of zero length. * @param array the array to check */ public static boolean isEmpty(Object[] array) { return (array == null || array.length == 0); } /** * Check whether the given array contains the given element. * @param array the array to check (may be {@code null}, * in which case the return value will always be {@code false}) * @param element the element to check for * @return whether the element has been found in the given array */ public static boolean containsElement(Object[] array, Object element) { if (array == null) { return false; } for (Object arrayEle : array) { if (nullSafeEquals(arrayEle, element)) { return true; } } return false; } /** * Check whether the given array of enum constants contains a constant with the given name, * ignoring case when determining a match. * @param enumValues the enum values to check, typically the product of a call to MyEnum.values() * @param constant the constant name to find (must not be null or empty string) * @return whether the constant has been found in the given array */ public static boolean containsConstant(Enum<?>[] enumValues, String constant) { return containsConstant(enumValues, constant, false); } /** * Check whether the given array of enum constants contains a constant with the given name. * @param enumValues the enum values to check, typically the product of a call to MyEnum.values() * @param constant the constant name to find (must not be null or empty string) * @param caseSensitive whether case is significant in determining a match * @return whether the constant has been found in the given array */ public static boolean containsConstant(Enum<?>[] enumValues, String constant, boolean caseSensitive) { for (Enum<?> candidate : enumValues) { if (caseSensitive ? candidate.toString().equals(constant) : candidate.toString().equalsIgnoreCase(constant)) { return true; } } return false; } /** * Case insensitive alternative to {@link Enum#valueOf(Class, String)}. * @param <E> the concrete Enum type * @param enumValues the array of all Enum constants in question, usually per Enum.values() * @param constant the constant to get the enum value of * @throws IllegalArgumentException if the given constant is not found in the given array * of enum values. Use {@link #containsConstant(Enum[], String)} as a guard to avoid this exception. */ public static <E extends Enum<?>> E caseInsensitiveValueOf(E[] enumValues, String constant) { for (E candidate : enumValues) { if (candidate.toString().equalsIgnoreCase(constant)) { return candidate; } } throw new IllegalArgumentException(String.format("constant [%s] does not exist in enum type %s", constant, enumValues.getClass().getComponentType().getName())); } /** * Append the given object to the given array, returning a new array * consisting of the input array contents plus the given object. * @param array the array to append to (can be {@code null}) * @param obj the object to append * @return the new array (of the same component type; never {@code null}) */ public static <A, O extends A> A[] addObjectToArray(A[] array, O obj) { Class<?> compType = Object.class; if (array != null) { compType = array.getClass().getComponentType(); } else if (obj != null) { compType = obj.getClass(); } int newArrLength = (array != null ? array.length + 1 : 1); @SuppressWarnings("unchecked") A[] newArr = (A[]) Array.newInstance(compType, newArrLength); if (array != null) { System.arraycopy(array, 0, newArr, 0, array.length); } newArr[newArr.length - 1] = obj; return newArr; } //--------------------------------------------------------------------- // Convenience methods for content-based equality/hash-code handling //--------------------------------------------------------------------- /** * Determine if the given objects are equal, returning {@code true} * if both are {@code null} or {@code false} if only one is * {@code null}. * <p>Compares arrays with {@code Arrays.equals}, performing an equality * check based on the array elements rather than the array reference. * @param o1 first Object to compare * @param o2 second Object to compare * @return whether the given objects are equal * @see java.util.Arrays#equals */ public static boolean nullSafeEquals(Object o1, Object o2) { if (o1 == o2) { return true; } if (o1 == null || o2 == null) { return false; } if (o1.equals(o2)) { return true; } if (o1.getClass().isArray() && o2.getClass().isArray()) { if (o1 instanceof Object[] && o2 instanceof Object[]) { return Arrays.equals((Object[]) o1, (Object[]) o2); } if (o1 instanceof boolean[] && o2 instanceof boolean[]) { return Arrays.equals((boolean[]) o1, (boolean[]) o2); } if (o1 instanceof byte[] && o2 instanceof byte[]) { return Arrays.equals((byte[]) o1, (byte[]) o2); } if (o1 instanceof char[] && o2 instanceof char[]) { return Arrays.equals((char[]) o1, (char[]) o2); } if (o1 instanceof double[] && o2 instanceof double[]) { return Arrays.equals((double[]) o1, (double[]) o2); } if (o1 instanceof float[] && o2 instanceof float[]) { return Arrays.equals((float[]) o1, (float[]) o2); } if (o1 instanceof int[] && o2 instanceof int[]) { return Arrays.equals((int[]) o1, (int[]) o2); } if (o1 instanceof long[] && o2 instanceof long[]) { return Arrays.equals((long[]) o1, (long[]) o2); } if (o1 instanceof short[] && o2 instanceof short[]) { return Arrays.equals((short[]) o1, (short[]) o2); } } return false; } /** * Return as hash code for the given object; typically the value of * {@code {@link Object#hashCode()}}. If the object is an array, * this method will delegate to any of the {@code nullSafeHashCode} * methods for arrays in this class. If the object is {@code null}, * this method returns 0. * @see #nullSafeHashCode(Object[]) * @see #nullSafeHashCode(boolean[]) * @see #nullSafeHashCode(byte[]) * @see #nullSafeHashCode(char[]) * @see #nullSafeHashCode(double[]) * @see #nullSafeHashCode(float[]) * @see #nullSafeHashCode(int[]) * @see #nullSafeHashCode(long[]) * @see #nullSafeHashCode(short[]) */ public static int nullSafeHashCode(Object obj) { if (obj == null) { return 0; } if (obj.getClass().isArray()) { if (obj instanceof Object[]) { return nullSafeHashCode((Object[]) obj); } if (obj instanceof boolean[]) { return nullSafeHashCode((boolean[]) obj); } if (obj instanceof byte[]) { return nullSafeHashCode((byte[]) obj); } if (obj instanceof char[]) { return nullSafeHashCode((char[]) obj); } if (obj instanceof double[]) { return nullSafeHashCode((double[]) obj); } if (obj instanceof float[]) { return nullSafeHashCode((float[]) obj); } if (obj instanceof int[]) { return nullSafeHashCode((int[]) obj); } if (obj instanceof long[]) { return nullSafeHashCode((long[]) obj); } if (obj instanceof short[]) { return nullSafeHashCode((short[]) obj); } } return obj.hashCode(); } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(Object[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + nullSafeHashCode(array[i]); } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(boolean[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + hashCode(array[i]); } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(byte[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + array[i]; } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(char[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + array[i]; } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(double[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + hashCode(array[i]); } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(float[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + hashCode(array[i]); } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(int[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + array[i]; } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(long[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + hashCode(array[i]); } return hash; } /** * Return a hash code based on the contents of the specified array. * If {@code array} is {@code null}, this method returns 0. */ public static int nullSafeHashCode(short[] array) { if (array == null) { return 0; } int hash = INITIAL_HASH; int arraySize = array.length; for (int i = 0; i < arraySize; i++) { hash = MULTIPLIER * hash + array[i]; } return hash; } /** * Return the same value as {@link Boolean#hashCode()}}. * @see Boolean#hashCode() */ public static int hashCode(boolean bool) { return bool ? 1231 : 1237; } /** * Return the same value as {@link Double#hashCode()}}. * @see Double#hashCode() */ public static int hashCode(double dbl) { long bits = Double.doubleToLongBits(dbl); return hashCode(bits); } /** * Return the same value as {@link Float#hashCode()}}. * @see Float#hashCode() */ public static int hashCode(float flt) { return Float.floatToIntBits(flt); } /** * Return the same value as {@link Long#hashCode()}}. * @see Long#hashCode() */ public static int hashCode(long lng) { return (int) (lng ^ (lng >>> 32)); } //--------------------------------------------------------------------- // Convenience methods for toString output //--------------------------------------------------------------------- /** * Return a String representation of an object's overall identity. * @param obj the object (may be {@code null}) * @return the object's identity as String representation, * or an empty String if the object was {@code null} */ public static String identityToString(Object obj) { if (obj == null) { return EMPTY_STRING; } return obj.getClass().getName() + "@" + getIdentityHexString(obj); } /** * Return a hex String form of an object's identity hash code. * @param obj the object * @return the object's identity code in hex notation */ public static String getIdentityHexString(Object obj) { return Integer.toHexString(System.identityHashCode(obj)); } /** * Return a content-based String representation if {@code obj} is * not {@code null}; otherwise returns an empty String. * <p>Differs from {@link #nullSafeToString(Object)} in that it returns * an empty String rather than "null" for a {@code null} value. * @param obj the object to build a display String for * @return a display String representation of {@code obj} * @see #nullSafeToString(Object) */ public static String getDisplayString(Object obj) { if (obj == null) { return EMPTY_STRING; } return nullSafeToString(obj); } /** * Determine the class name for the given object. * <p>Returns {@code "null"} if {@code obj} is {@code null}. * @param obj the object to introspect (may be {@code null}) * @return the corresponding class name */ public static String nullSafeClassName(Object obj) { return (obj != null ? obj.getClass().getName() : NULL_STRING); } /** * Return a String representation of the specified Object. * <p>Builds a String representation of the contents in case of an array. * Returns {@code "null"} if {@code obj} is {@code null}. * @param obj the object to build a String representation for * @return a String representation of {@code obj} */ public static String nullSafeToString(Object obj) { if (obj == null) { return NULL_STRING; } if (obj instanceof String) { return (String) obj; } if (obj instanceof Object[]) { return nullSafeToString((Object[]) obj); } if (obj instanceof boolean[]) { return nullSafeToString((boolean[]) obj); } if (obj instanceof byte[]) { return nullSafeToString((byte[]) obj); } if (obj instanceof char[]) { return nullSafeToString((char[]) obj); } if (obj instanceof double[]) { return nullSafeToString((double[]) obj); } if (obj instanceof float[]) { return nullSafeToString((float[]) obj); } if (obj instanceof int[]) { return nullSafeToString((int[]) obj); } if (obj instanceof long[]) { return nullSafeToString((long[]) obj); } if (obj instanceof short[]) { return nullSafeToString((short[]) obj); } String str = obj.toString(); return (str != null ? str : EMPTY_STRING); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(Object[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(String.valueOf(array[i])); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(boolean[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(array[i]); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(byte[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(array[i]); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(char[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append("'").append(array[i]).append("'"); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(double[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(array[i]); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(float[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(array[i]); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(int[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(array[i]); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(long[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(array[i]); } sb.append(ARRAY_END); return sb.toString(); } /** * Return a String representation of the contents of the specified array. * <p>The String representation consists of a list of the array's elements, * enclosed in curly braces ({@code "{}"}). Adjacent elements are separated * by the characters {@code ", "} (a comma followed by a space). Returns * {@code "null"} if {@code array} is {@code null}. * @param array the array to build a String representation for * @return a String representation of {@code array} */ public static String nullSafeToString(short[] array) { if (array == null) { return NULL_STRING; } int length = array.length; if (length == 0) { return EMPTY_ARRAY; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { if (i == 0) { sb.append(ARRAY_START); } else { sb.append(ARRAY_ELEMENT_SEPARATOR); } sb.append(array[i]); } sb.append(ARRAY_END); return sb.toString(); } }