org.joda.beans.JodaBeanUtils Maven / Gradle / Ivy
/*
* Copyright 2001-present Stephen Colebourne
*
* 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 org.joda.beans;
import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.function.Function;
import org.joda.beans.impl.direct.DirectBean;
import org.joda.beans.impl.flexi.FlexiBean;
import org.joda.collect.grid.DenseGrid;
import org.joda.collect.grid.Grid;
import org.joda.collect.grid.ImmutableGrid;
import org.joda.collect.grid.SparseGrid;
import org.joda.convert.StringConvert;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableTable;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.LinkedHashMultiset;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multiset;
import com.google.common.collect.SetMultimap;
import com.google.common.collect.SortedMultiset;
import com.google.common.collect.Table;
import com.google.common.collect.TreeMultiset;
/**
* A set of utilities to assist when working with beans and properties.
*/
public final class JodaBeanUtils {
/**
* The cache of meta-beans.
*/
private static final StringConvert converter = new StringConvert();
/**
* Restricted constructor.
*/
private JodaBeanUtils() {
}
//-----------------------------------------------------------------------
/**
* Obtains a meta-bean from a {@code Class}.
*
* This will return a meta-bean if it has been registered, or if the class
* implements {@link DynamicBean} and has a no-args constructor.
* Note that the common case where the meta-bean is registered by a static initializer is handled.
*
* @param cls the class to get the meta-bean for, not null
* @return the meta-bean, not null
* @throws IllegalArgumentException if unable to obtain the meta-bean
* @deprecated Use {@link MetaBean#of(Class)}
*/
@Deprecated
public static MetaBean metaBean(Class cls) {
return MetaBean.of(cls);
}
/**
* Registers a meta-bean.
*
* This should be done for all beans in a static factory where possible.
* If the meta-bean is dynamic, this method should not be called.
*
* @param metaBean the meta-bean, not null
* @throws IllegalArgumentException if unable to register
* @deprecated Use {@link MetaBean#register(MetaBean)}
*/
@Deprecated
public static void registerMetaBean(MetaBean metaBean) {
MetaBean.register(metaBean);
}
//-----------------------------------------------------------------------
/**
* Gets the standard string format converter.
*
* This returns a singleton that may be mutated (holds a concurrent map).
* New conversions should be registered at program startup.
*
* @return the standard string converter, not null
*/
public static StringConvert stringConverter() {
return converter;
}
//-----------------------------------------------------------------------
/**
* Checks if two objects are equal handling null.
*
* @param obj1 the first object, may be null
* @param obj2 the second object, may be null
* @return true if equal
*/
public static boolean equal(Object obj1, Object obj2) {
if (obj1 == obj2) {
return true;
}
if (obj1 == null || obj2 == null) {
return false;
}
if (obj1.getClass().isArray()) {
return equalsArray(obj1, obj2);
}
// this does not handle arrays embedded in objects, such as in lists/maps
// but you shouldn't use arrays like that, should you?
return obj1.equals(obj2);
}
// extracted from equal(Object,Object) to aid hotspot inlining
private static boolean equalsArray(Object obj1, Object obj2) {
if (obj1 instanceof Object[] && obj2 instanceof Object[] && obj1.getClass() == obj2.getClass()) {
return Arrays.deepEquals((Object[]) obj1, (Object[]) obj2);
} else if (obj1 instanceof int[] && obj2 instanceof int[]) {
return Arrays.equals((int[]) obj1, (int[]) obj2);
} else if (obj1 instanceof long[] && obj2 instanceof long[]) {
return Arrays.equals((long[]) obj1, (long[]) obj2);
} else if (obj1 instanceof byte[] && obj2 instanceof byte[]) {
return Arrays.equals((byte[]) obj1, (byte[]) obj2);
} else if (obj1 instanceof double[] && obj2 instanceof double[]) {
return Arrays.equals((double[]) obj1, (double[]) obj2);
} else if (obj1 instanceof float[] && obj2 instanceof float[]) {
return Arrays.equals((float[]) obj1, (float[]) obj2);
} else if (obj1 instanceof char[] && obj2 instanceof char[]) {
return Arrays.equals((char[]) obj1, (char[]) obj2);
} else if (obj1 instanceof short[] && obj2 instanceof short[]) {
return Arrays.equals((short[]) obj1, (short[]) obj2);
} else if (obj1 instanceof boolean[] && obj2 instanceof boolean[]) {
return Arrays.equals((boolean[]) obj1, (boolean[]) obj2);
}
// reachable if obj1 is an array and obj2 is not
return false;
}
/**
* Checks if two floats are equal based on identity.
*
* This performs the same check as {@link Float#equals(Object)}.
*
* @param val1 the first value, may be null
* @param val2 the second value, may be null
* @return true if equal
*/
public static boolean equal(float val1, float val2) {
return Float.floatToIntBits(val1) == Float.floatToIntBits(val2);
}
/**
* Checks if two floats are equal within the specified tolerance.
*
* Two NaN values are equal. Positive and negative infinity are only equal with themselves.
* Otherwise, the difference between the values is compared to the tolerance.
*
* @param val1 the first value, may be null
* @param val2 the second value, may be null
* @param tolerance the tolerance used to compare equal
* @return true if equal
*/
public static boolean equalWithTolerance(float val1, float val2, double tolerance) {
return (Float.floatToIntBits(val1) == Float.floatToIntBits(val2)) || Math.abs(val1 - val2) <= tolerance;
}
/**
* Checks if two doubles are equal based on identity.
*
* This performs the same check as {@link Double#equals(Object)}.
*
* @param val1 the first value, may be null
* @param val2 the second value, may be null
* @return true if equal
*/
public static boolean equal(double val1, double val2) {
return Double.doubleToLongBits(val1) == Double.doubleToLongBits(val2);
}
/**
* Checks if two doubles are equal within the specified tolerance.
*
* Two NaN values are equal. Positive and negative infinity are only equal with themselves.
* Otherwise, the difference between the values is compared to the tolerance.
* The tolerance is expected to be a finite value, not NaN or infinity.
*
* @param val1 the first value, may be null
* @param val2 the second value, may be null
* @param tolerance the tolerance used to compare equal
* @return true if equal
*/
public static boolean equalWithTolerance(double val1, double val2, double tolerance) {
return (Double.doubleToLongBits(val1) == Double.doubleToLongBits(val2)) || Math.abs(val1 - val2) <= tolerance;
}
/**
* Returns a hash code for an object handling null.
*
* @param obj the object, may be null
* @return the hash code
*/
public static int hashCode(Object obj) {
if (obj == null) {
return 0;
}
if (obj.getClass().isArray()) {
return hashCodeArray(obj);
}
return obj.hashCode();
}
// extracted from hashCode(Object) to aid hotspot inlining
private static int hashCodeArray(Object obj) {
if (obj instanceof Object[]) {
return Arrays.deepHashCode((Object[]) obj);
} else if (obj instanceof int[]) {
return Arrays.hashCode((int[]) obj);
} else if (obj instanceof long[]) {
return Arrays.hashCode((long[]) obj);
} else if (obj instanceof byte[]) {
return Arrays.hashCode((byte[]) obj);
} else if (obj instanceof double[]) {
return Arrays.hashCode((double[]) obj);
} else if (obj instanceof float[]) {
return Arrays.hashCode((float[]) obj);
} else if (obj instanceof char[]) {
return Arrays.hashCode((char[]) obj);
} else if (obj instanceof short[]) {
return Arrays.hashCode((short[]) obj);
} else if (obj instanceof boolean[]) {
return Arrays.hashCode((boolean[]) obj);
}
// unreachable?
return obj.hashCode();
}
/**
* Returns a hash code for a {@code boolean}.
*
* @param value the value to convert to a hash code
* @return the hash code
*/
public static int hashCode(boolean value) {
return value ? 1231 : 1237;
}
/**
* Returns a hash code for an {@code int}.
*
* @param value the value to convert to a hash code
* @return the hash code
*/
public static int hashCode(int value) {
return value;
}
/**
* Returns a hash code for a {@code long}.
*
* @param value the value to convert to a hash code
* @return the hash code
*/
public static int hashCode(long value) {
return (int) (value ^ value >>> 32);
}
/**
* Returns a hash code for a {@code float}.
*
* @param value the value to convert to a hash code
* @return the hash code
*/
public static int hashCode(float value) {
return Float.floatToIntBits(value);
}
/**
* Returns a hash code for a {@code double}.
*
* @param value the value to convert to a hash code
* @return the hash code
*/
public static int hashCode(double value) {
return hashCode(Double.doubleToLongBits(value));
}
//-----------------------------------------------------------------------
/**
* Returns the {@code toString} value handling arrays.
*
* @param obj the object, may be null
* @return the string, not null
*/
public static String toString(Object obj) {
if (obj == null) {
return "null";
}
if (obj.getClass().isArray()) {
return toStringArray(obj);
}
return obj.toString();
}
// extracted from toString(Object) to aid hotspot inlining
private static String toStringArray(Object obj) {
if (obj instanceof Object[]) {
return Arrays.deepToString((Object[]) obj);
} else if (obj instanceof int[]) {
return Arrays.toString((int[]) obj);
} else if (obj instanceof long[]) {
return Arrays.toString((long[]) obj);
} else if (obj instanceof byte[]) {
return Arrays.toString((byte[]) obj);
} else if (obj instanceof double[]) {
return Arrays.toString((double[]) obj);
} else if (obj instanceof float[]) {
return Arrays.toString((float[]) obj);
} else if (obj instanceof char[]) {
return Arrays.toString((char[]) obj);
} else if (obj instanceof short[]) {
return Arrays.toString((short[]) obj);
} else if (obj instanceof boolean[]) {
return Arrays.toString((boolean[]) obj);
}
// unreachable?
return obj.toString();
}
//-----------------------------------------------------------------------
/**
* Checks if the two beans have the same set of properties.
*
* This comparison checks that both beans have the same set of property names
* and that the value of each property name is also equal.
* It does not check the bean type, thus a {@link FlexiBean} may be equal
* to a {@link DirectBean}.
*
* This comparison is usable with the {@link #propertiesHashCode} method.
* The result is the same as that if each bean was converted to a {@code Map}
* from name to value.
*
* @param bean1 the first bean to compare, not null
* @param bean2 the second bean to compare, not null
* @return true if equal
*/
public static boolean propertiesEqual(Bean bean1, Bean bean2) {
Set names = bean1.propertyNames();
if (names.equals(bean2.propertyNames()) == false) {
return false;
}
for (String name : names) {
Object value1 = bean1.property(name).get();
Object value2 = bean2.property(name).get();
if (equal(value1, value2) == false) {
return false;
}
}
return true;
}
/**
* Returns a hash code based on the set of properties on a bean.
*
* This hash code is usable with the {@link #propertiesEqual} method.
* The result is the same as that if each bean was converted to a {@code Map}
* from name to value.
*
* @param bean the bean to generate a hash code for, not null
* @return the hash code
*/
public static int propertiesHashCode(Bean bean) {
int hash = 7;
Set names = bean.propertyNames();
for (String name : names) {
Object value = bean.property(name).get();
hash += hashCode(value);
}
return hash;
}
/**
* Returns a string describing the set of properties on a bean.
*
* The result is the same as that if the bean was converted to a {@code Map}
* from name to value.
*
* @param bean the bean to generate a string for, not null
* @param prefix the prefix to use, null ignored
* @return the string form of the bean, not null
*/
public static String propertiesToString(Bean bean, String prefix) {
Set names = bean.propertyNames();
StringBuilder buf;
if (prefix != null) {
buf = new StringBuilder((names.size()) * 32 + prefix.length()).append(prefix);
} else {
buf = new StringBuilder((names.size()) * 32);
}
buf.append('{');
if (names.size() > 0) {
for (String name : names) {
Object value = bean.property(name).get();
buf.append(name).append('=').append(value).append(',').append(' ');
}
buf.setLength(buf.length() - 2);
}
buf.append('}');
return buf.toString();
}
/**
* Flattens a bean to a {@code Map}.
*
* The returned map will contain all the properties from the bean with their actual values.
*
* @param bean the bean to generate a string for, not null
* @return the bean as a map, not null
*/
public static Map flatten(Bean bean) {
Map> propertyMap = bean.metaBean().metaPropertyMap();
Map map = new LinkedHashMap<>(propertyMap.size());
for (Entry> entry : propertyMap.entrySet()) {
map.put(entry.getKey(), entry.getValue().get(bean));
}
return Collections.unmodifiableMap(map);
}
//-----------------------------------------------------------------------
/**
* Copies properties from a bean to a different bean type.
*
* This copies each non-null property value from the source bean to the destination builder
* provided that the destination builder supports the property name and the type is compatible.
*
* @param the type of the bean to create
* @param sourceBean the bean to copy from, not null
* @param destType the type of the destination bean, not null
* @return the copied bean as a builder
* @throws RuntimeException if unable to copy a property
*/
public static BeanBuilder copy(Bean sourceBean, Class destType) {
MetaBean destMeta = MetaBean.of(destType);
@SuppressWarnings("unchecked")
BeanBuilder destBuilder = (BeanBuilder) destMeta.builder();
return copyInto(sourceBean, destMeta, destBuilder);
}
/**
* Copies properties from a bean to a builder, which may be for a different type.
*
* This copies each non-null property value from the source bean to the destination builder
* provided that the destination builder supports the property name and the type is compatible.
*
* @param the type of the bean to create
* @param sourceBean the bean to copy from, not null
* @param destMeta the meta bean of the destination, not null
* @param destBuilder the builder to populate, not null
* @return the updated builder
* @throws RuntimeException if unable to copy a property
*/
public static BeanBuilder copyInto(Bean sourceBean, MetaBean destMeta, BeanBuilder destBuilder) {
MetaBean sourceMeta = sourceBean.metaBean();
for (MetaProperty sourceProp : sourceMeta.metaPropertyIterable()) {
if (destMeta.metaPropertyExists(sourceProp.name())) {
MetaProperty destProp = destMeta.metaProperty(sourceProp.name());
if (destProp.propertyType().isAssignableFrom(sourceProp.propertyType())) {
Object sourceValue = sourceProp.get(sourceBean);
if (sourceValue != null) {
destBuilder.set(destProp, sourceValue);
}
}
}
}
return destBuilder;
}
//-----------------------------------------------------------------------
/**
* Clones a bean.
*
* This performs a deep clone. There is no protection against cycles in
* the object graph beyond {@code StackOverflowError}.
*
* @param the type of the bean
* @param original the original bean to clone, null returns null
* @return the cloned bean, null if null input
*/
public static T clone(T original) {
if (original == null || original instanceof ImmutableBean) {
return original;
}
return cloneAlways(original);
}
/**
* Clones a bean always.
*
* This performs a deep clone. There is no protection against cycles in
* the object graph beyond {@code StackOverflowError}.
* This differs from {@link #clone()} in that immutable beans are also cloned.
*
* @param the type of the bean
* @param original the original bean to clone, not null
* @return the cloned bean, not null
*/
public static T cloneAlways(T original) {
@SuppressWarnings("unchecked")
BeanBuilder builder = (BeanBuilder) original.metaBean().builder();
for (MetaProperty mp : original.metaBean().metaPropertyIterable()) {
if (mp.style().isBuildable()) {
Object value = mp.get(original);
builder.set(mp.name(), Cloner.INSTANCE.clone(value));
}
}
return builder.build();
}
//-----------------------------------------------------------------------
/**
* Checks if the value is not null, throwing an exception if it is.
*
* @param value the value to check, may be null
* @param propertyName the property name, should not be null
* @throws IllegalArgumentException if the value is null
*/
public static void notNull(Object value, String propertyName) {
if (value == null) {
throw new IllegalArgumentException(notNullMsg(propertyName));
}
}
// extracted from notNull(Object,String) to aid hotspot inlining
private static String notNullMsg(String propertyName) {
return "Argument '" + propertyName + "' must not be null";
}
/**
* Checks if the value is not blank, throwing an exception if it is.
*
* Validate that the specified argument is not null and has at least one non-whitespace character.
*
* @param value the value to check, may be null
* @param propertyName the property name, should not be null
* @throws IllegalArgumentException if the value is null or empty
*/
public static void notBlank(String value, String propertyName) {
if (isBlank(value)) {
throw new IllegalArgumentException(notBlank(propertyName));
}
}
@SuppressWarnings("null")
private static boolean isBlank(String str) {
int strLen = (str != null ? str.length() : 0);
if (strLen != 0) {
for (int i = 0; i < strLen; i++) {
if (!Character.isWhitespace(str.charAt(i))) {
return false;
}
}
}
return true;
}
private static String notBlank(String propertyName) {
return "Argument '" + propertyName + "' must not be empty";
}
/**
* Checks if the value is not empty, throwing an exception if it is.
*
* @param value the value to check, may be null
* @param propertyName the property name, should not be null
* @throws IllegalArgumentException if the value is null or empty
*/
public static void notEmpty(String value, String propertyName) {
if (value == null || value.length() == 0) {
throw new IllegalArgumentException(notEmpty(propertyName));
}
}
// extracted from notEmpty(?,String) to aid hotspot inlining
private static String notEmpty(String propertyName) {
return "Argument '" + propertyName + "' must not be empty";
}
/**
* Checks if the collection value is not empty, throwing an exception if it is.
*
* @param value the value to check, may be null
* @param propertyName the property name, should not be null
* @throws IllegalArgumentException if the value is null or empty
*/
public static void notEmpty(Collection value, String propertyName) {
if (value == null || value.isEmpty()) {
throw new IllegalArgumentException(notEmpty(propertyName));
}
}
/**
* Checks if the map value is not empty, throwing an exception if it is.
*
* @param value the value to check, may be null
* @param propertyName the property name, should not be null
* @throws IllegalArgumentException if the value is null or empty
*/
public static void notEmpty(Map value, String propertyName) {
if (value == null || value.isEmpty()) {
throw new IllegalArgumentException(notEmpty(propertyName));
}
}
//-----------------------------------------------------------------------
/**
* Extracts the collection content type as a {@code Class} from a property.
*
* This method allows the resolution of generics in certain cases.
*
* @param prop the property to examine, not null
* @return the collection content type, null if unable to determine or type has no generic parameters
*/
public static Class collectionType(Property prop) {
return collectionType(prop.metaProperty(), prop.bean().getClass());
}
/**
* Extracts the collection content type as a {@code Class} from a meta-property.
*
* The target type is the type of the object, not the declaring type of the meta-property.
*
* @param prop the property to examine, not null
* @param targetClass the target type to evaluate against, not null
* @return the collection content type, null if unable to determine or type has no generic parameters
*/
public static Class collectionType(MetaProperty prop, Class targetClass) {
return extractTypeClass(prop, targetClass, 1, 0);
}
/**
* Extracts the map value type generic type parameters as a {@code Class} from a meta-property.
*
* The target type is the type of the object, not the declaring type of the meta-property.
*
* This is used when the collection generic parameter is a map or collection.
*
* @param prop the property to examine, not null
* @param targetClass the target type to evaluate against, not null
* @return the collection content type generic parameters, empty if unable to determine, no nulls
*/
public static List> collectionTypeTypes(MetaProperty prop, Class targetClass) {
Type type = extractType(targetClass, prop, 1, 0);
return extractTypeClasses(targetClass, type);
}
/**
* Extracts the map key type as a {@code Class} from a meta-property.
*
* @param prop the property to examine, not null
* @return the map key type, null if unable to determine or type has no generic parameters
*/
public static Class mapKeyType(Property prop) {
return mapKeyType(prop.metaProperty(), prop.bean().getClass());
}
/**
* Extracts the map key type as a {@code Class} from a meta-property.
*
* The target type is the type of the object, not the declaring type of the meta-property.
*
* @param prop the property to examine, not null
* @param targetClass the target type to evaluate against, not null
* @return the map key type, null if unable to determine or type has no generic parameters
*/
public static Class mapKeyType(MetaProperty prop, Class targetClass) {
return extractTypeClass(prop, targetClass, 2, 0);
}
/**
* Extracts the map value type as a {@code Class} from a meta-property.
*
* @param prop the property to examine, not null
* @return the map value type, null if unable to determine or type has no generic parameters
*/
public static Class mapValueType(Property prop) {
return mapValueType(prop.metaProperty(), prop.bean().getClass());
}
/**
* Extracts the map value type as a {@code Class} from a meta-property.
*
* The target type is the type of the object, not the declaring type of the meta-property.
*
* @param prop the property to examine, not null
* @param targetClass the target type to evaluate against, not null
* @return the map value type, null if unable to determine or type has no generic parameters
*/
public static Class mapValueType(MetaProperty prop, Class targetClass) {
return extractTypeClass(prop, targetClass, 2, 1);
}
/**
* Extracts the map value type generic type parameters as a {@code Class} from a meta-property.
*
* The target type is the type of the object, not the declaring type of the meta-property.
*
* This is used when the map value generic parameter is a map or collection.
*
* @param prop the property to examine, not null
* @param targetClass the target type to evaluate against, not null
* @return the map value type generic parameters, empty if unable to determine, no nulls
*/
public static List> mapValueTypeTypes(MetaProperty prop, Class targetClass) {
Type type = extractType(targetClass, prop, 2, 1);
return extractTypeClasses(targetClass, type);
}
/**
* Low-level method to extract generic type information.
*
* @param prop the property to examine, not null
* @param targetClass the target type to evaluate against, not null
* @param size the number of generic parameters expected
* @param index the index of the generic parameter
* @return the type, null if unable to determine or type has no generic parameters
*/
public static Class extractTypeClass(MetaProperty prop, Class targetClass, int size, int index) {
return eraseToClass(extractType(targetClass, prop, size, index));
}
private static Type extractType(Class targetClass, MetaProperty prop, int size, int index) {
Type genType = prop.propertyGenericType();
if (genType instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType) genType;
Type[] types = pt.getActualTypeArguments();
if (types.length == size) {
Type type = types[index];
if (type instanceof WildcardType) {
WildcardType wtype = (WildcardType) type;
if (wtype.getLowerBounds().length == 0 && wtype.getUpperBounds().length > 0) {
type = wtype.getUpperBounds()[0];
}
}
if (type instanceof TypeVariable) {
type = resolveGenerics(targetClass, (TypeVariable) type);
}
return type;
}
}
return null;
}
private static List> extractTypeClasses(Class targetClass, Type type) {
List> result = new ArrayList<>();
if (type != null) {
if (type instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType) type;
Type[] actualTypes = pt.getActualTypeArguments();
for (Type actualType : actualTypes) {
if (actualType instanceof TypeVariable) {
actualType = resolveGenerics(targetClass, (TypeVariable) actualType);
}
Class cls = eraseToClass(actualType);
result.add(cls != null ? cls : Object.class);
}
}
}
return result;
}
private static Type resolveGenerics(Class targetClass, TypeVariable typevar) {
// looks up meaning of type variables like T
Map resolved = new HashMap<>();
Type type = targetClass;
while (type != null) {
if (type instanceof Class) {
type = ((Class) type).getGenericSuperclass();
} else if (type instanceof ParameterizedType) {
// find actual types captured by subclass
ParameterizedType pt = (ParameterizedType) type;
Type[] actualTypeArguments = pt.getActualTypeArguments();
// find type variables declared in source code
Class rawType = eraseToClass(pt.getRawType());
if (rawType == null) {
return null;
}
TypeVariable[] typeParameters = rawType.getTypeParameters();
for (int i = 0; i < actualTypeArguments.length; i++) {
resolved.put(typeParameters[i], actualTypeArguments[i]);
}
type = rawType.getGenericSuperclass();
}
}
// resolve type variable to a meaningful type
Type result = typevar;
while (resolved.containsKey(result)) {
result = resolved.get(result);
}
return result;
}
private static Class eraseToClass(Type type) {
if (type instanceof Class) {
return (Class) type;
} else if (type instanceof ParameterizedType) {
return eraseToClass(((ParameterizedType) type).getRawType());
} else if (type instanceof GenericArrayType) {
Type componentType = ((GenericArrayType) type).getGenericComponentType();
Class componentClass = eraseToClass(componentType);
if (componentClass != null) {
return Array.newInstance(componentClass, 0).getClass();
}
} else if (type instanceof TypeVariable) {
Type[] bounds = ((TypeVariable) type).getBounds();
if (bounds.length == 0) {
return Object.class;
} else {
return eraseToClass(bounds[0]);
}
}
return null;
}
//-------------------------------------------------------------------------
/**
* Checks if two beans are equal ignoring one or more properties.
*
* This version of {@code equalIgnoring} only checks properties at the top level.
* For example, if a {@code Person} bean contains an {@code Address} bean then
* only properties on the {@code Person} bean will be checked against the ignore list.
*
* @param bean1 the first bean, not null
* @param bean2 the second bean, not null
* @param properties the properties to ignore, not null
* @return true if equal
* @throws IllegalArgumentException if inputs are null
*/
public static boolean equalIgnoring(Bean bean1, Bean bean2, MetaProperty... properties) {
JodaBeanUtils.notNull(bean1, "bean1");
JodaBeanUtils.notNull(bean2, "bean2");
JodaBeanUtils.notNull(properties, "properties");
if (bean1 == bean2) {
return true;
}
if (bean1.getClass() != bean2.getClass()) {
return false;
}
switch (properties.length) {
case 0:
return bean1.equals(bean2);
case 1: {
MetaProperty ignored = properties[0];
for (MetaProperty mp : bean1.metaBean().metaPropertyIterable()) {
if (ignored.equals(mp) == false && JodaBeanUtils.equal(mp.get(bean1), mp.get(bean2)) == false) {
return false;
}
}
return true;
}
default:
Set> ignored = new HashSet<>(Arrays.asList(properties));
for (MetaProperty mp : bean1.metaBean().metaPropertyIterable()) {
if (ignored.contains(mp) == false
&& JodaBeanUtils.equal(mp.get(bean1), mp.get(bean2)) == false) {
return false;
}
}
return true;
}
}
//-----------------------------------------------------------------------
/**
* Returns an iterator over all the beans contained within the bean.
*
* The iterator is a depth-first traversal of the beans within the specified bean.
* The first returned bean is the specified bean.
* Beans within collections will be returned.
*
* A cycle in the bean structure will cause an infinite loop.
*
* @param bean the bean to iterate over, not null
* @return the iterator, not null
*/
public static Iterator beanIterator(Bean bean) {
return new BeanIterator(bean);
}
//-------------------------------------------------------------------------
/**
* Chains two meta-properties together.
*
* The resulting function takes an instance of a bean, queries using the first
* meta-property, then queries the result using the second meta-property.
* If the first returns null, the result will be null.
*
* @param
the type of the result of the chain
* @param mp1 the first meta-property, not null
* @param mp2 the second meta-property, not null
* @return the chain function, not null
*/
public static
Function chain(MetaProperty mp1, MetaProperty mp2) {
notNull(mp1, "MetaProperty 1");
notNull(mp1, "MetaProperty 2");
return b -> {
Bean first = mp1.get(b);
return first != null ? mp2.get(first) : null;
};
}
/**
* Chains a function to a meta-property.
*
* The resulting function takes an instance of a bean, queries using the first
* function, then queries the result using the second meta-property.
* If the first returns null, the result will be null.
*
* @param
the type of the result of the chain
* @param fn1 the first meta-property, not null
* @param mp2 the second meta-property, not null
* @return the chain function, not null
*/
public static
Function chain(Function fn1, MetaProperty mp2) {
notNull(fn1, "Function 1");
notNull(fn1, "MetaProperty 2");
return b -> {
Bean first = fn1.apply(b);
return first != null ? mp2.get(first) : null;
};
}
//-------------------------------------------------------------------------
/**
* Obtains a comparator for the specified bean query.
*
* The result of the query must be {@link Comparable}.
*
* To use this with a meta-property append {@code ::get} to the meta-property,
* for example {@code Address.meta().street()::get}.
*
* @param query the query to use, not null
* @param ascending true for ascending, false for descending
* @return the comparator, not null
*/
public static Comparator comparator(Function query, boolean ascending) {
return (ascending ? comparatorAscending(query) : comparatorDescending(query));
}
/**
* Obtains an ascending comparator for the specified bean query.
*
* The result of the query must be {@link Comparable}.
*
* @param query the query to use, not null
* @return the comparator, not null
*/
public static Comparator comparatorAscending(Function query) {
if (query == null) {
throw new NullPointerException("Function must not be null");
}
return new Comp(query);
}
/**
* Obtains an descending comparator for the specified bean query.
*
* The result of the query must be {@link Comparable}.
*
* @param query the query to use, not null
* @return the comparator, not null
*/
public static Comparator comparatorDescending(Function query) {
if (query == null) {
throw new NullPointerException("Function must not be null");
}
return Collections.reverseOrder(new Comp(query));
}
//-------------------------------------------------------------------------
/**
* Comparator.
*/
private static final class Comp implements Comparator {
private final Function query;
private Comp(Function query) {
this.query = query;
}
@Override
public int compare(Bean bean1, Bean bean2) {
@SuppressWarnings("unchecked")
Comparable