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Spice up your java: Automatic Resource Management, automatic generation of getters, setters, equals, hashCode and toString, and more!
/*
* Copyright (C) 2013-2015 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.core.handlers;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;
import lombok.AllArgsConstructor;
import lombok.ConfigurationKeys;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.RequiredArgsConstructor;
import lombok.Setter;
import lombok.ToString;
import lombok.Value;
import lombok.core.AST;
import lombok.core.AnnotationValues;
import lombok.core.JavaIdentifiers;
import lombok.core.LombokNode;
import lombok.core.configuration.ConfigurationKey;
import lombok.core.configuration.FlagUsageType;
import lombok.experimental.Accessors;
import lombok.experimental.FieldDefaults;
import lombok.experimental.Wither;
/**
* Container for static utility methods useful for some of the standard lombok handlers, regardless of
* target platform (e.g. useful for both javac and Eclipse lombok implementations).
*/
public class HandlerUtil {
private HandlerUtil() {}
public static int primeForHashcode() {
return 59;
}
public static int primeForTrue() {
return 79;
}
public static int primeForFalse() {
return 97;
}
/** Checks if the given name is a valid identifier.
*
* If it is, this returns {@code true} and does nothing else.
* If it isn't, this returns {@code false} and adds an error message to the supplied node.
*/
public static boolean checkName(String nameSpec, String identifier, LombokNode errorNode) {
if (identifier.isEmpty()) {
errorNode.addError(nameSpec + " cannot be the empty string.");
return false;
}
if (!JavaIdentifiers.isValidJavaIdentifier(identifier)) {
errorNode.addError(nameSpec + " must be a valid java identifier.");
return false;
}
return true;
}
public static String autoSingularize(String plural) {
return Singulars.autoSingularize(plural);
}
public static void handleFlagUsage(LombokNode node, ConfigurationKey key, String featureName) {
FlagUsageType fut = node.getAst().readConfiguration(key);
if (fut != null) {
String msg = "Use of " + featureName + " is flagged according to lombok configuration.";
if (fut == FlagUsageType.WARNING) node.addWarning(msg);
else node.addError(msg);
}
}
public static void handleExperimentalFlagUsage(LombokNode node, ConfigurationKey key, String featureName) {
handleFlagUsage(node, key, featureName, ConfigurationKeys.EXPERIMENTAL_FLAG_USAGE, "any lombok.experimental feature");
}
public static void handleFlagUsage(LombokNode node, ConfigurationKey key1, String featureName1, ConfigurationKey key2, String featureName2) {
FlagUsageType fut1 = node.getAst().readConfiguration(key1);
FlagUsageType fut2 = node.getAst().readConfiguration(key2);
FlagUsageType fut = null;
String featureName = null;
if (fut1 == FlagUsageType.ERROR) {
fut = fut1;
featureName = featureName1;
} else if (fut2 == FlagUsageType.ERROR) {
fut = fut2;
featureName = featureName2;
} else if (fut1 == FlagUsageType.WARNING) {
fut = fut1;
featureName = featureName1;
} else {
fut = fut2;
featureName = featureName2;
}
if (fut != null) {
String msg = "Use of " + featureName + " is flagged according to lombok configuration.";
if (fut == FlagUsageType.WARNING) node.addWarning(msg);
else node.addError(msg);
}
}
public static boolean shouldReturnThis0(AnnotationValues accessors, AST ast) {
boolean chainForced = accessors.isExplicit("chain");
boolean fluentForced = accessors.isExplicit("fluent");
Accessors instance = accessors.getInstance();
boolean chain = instance.chain();
boolean fluent = instance.fluent();
if (chainForced) return chain;
if (!chainForced) {
Boolean chainConfig = ast.readConfiguration(ConfigurationKeys.ACCESSORS_CHAIN);
if (chainConfig != null) return chainConfig;
}
if (!fluentForced) {
Boolean fluentConfig = ast.readConfiguration(ConfigurationKeys.ACCESSORS_FLUENT);
if (fluentConfig != null) fluent = fluentConfig;
}
return chain || fluent;
}
@SuppressWarnings({"all", "unchecked", "deprecation"})
public static final List> INVALID_ON_BUILDERS = Collections.unmodifiableList(
Arrays.>asList(
Getter.class, Setter.class, Wither.class, ToString.class, EqualsAndHashCode.class,
RequiredArgsConstructor.class, AllArgsConstructor.class, NoArgsConstructor.class,
Data.class, Value.class, lombok.experimental.Value.class, FieldDefaults.class));
/**
* Given the name of a field, return the 'base name' of that field. For example, {@code fFoobar} becomes {@code foobar} if {@code f} is in the prefix list.
* For prefixes that end in a letter character, the next character must be a non-lowercase character (i.e. {@code hashCode} is not {@code ashCode} even if
* {@code h} is in the prefix list, but {@code hAshcode} would become {@code ashCode}). The first prefix that matches is used. If the prefix list is empty,
* or the empty string is in the prefix list and no prefix before it matches, the fieldName will be returned verbatim.
*
* If no prefix matches and the empty string is not in the prefix list and the prefix list is not empty, {@code null} is returned.
*
* @param fieldName The full name of a field.
* @param prefixes A list of prefixes, usually provided by the {@code Accessors} settings annotation, listing field prefixes.
* @return The base name of the field.
*/
public static CharSequence removePrefix(CharSequence fieldName, List prefixes) {
if (prefixes == null || prefixes.isEmpty()) return fieldName;
fieldName = fieldName.toString();
outer:
for (String prefix : prefixes) {
if (prefix.length() == 0) return fieldName;
if (fieldName.length() <= prefix.length()) continue outer;
for (int i = 0; i < prefix.length(); i++) {
if (fieldName.charAt(i) != prefix.charAt(i)) continue outer;
}
char followupChar = fieldName.charAt(prefix.length());
// if prefix is a letter then follow up letter needs to not be lowercase, i.e. 'foo' is not a match
// as field named 'oo' with prefix 'f', but 'fOo' would be.
if (Character.isLetter(prefix.charAt(prefix.length() - 1)) &&
Character.isLowerCase(followupChar)) continue outer;
return "" + Character.toLowerCase(followupChar) + fieldName.subSequence(prefix.length() + 1, fieldName.length());
}
return null;
}
/* NB: 'notnull' is not part of the pattern because there are lots of @NotNull annotations out there that are crappily named and actually mean
something else, such as 'this field must not be null _when saved to the db_ but its perfectly okay to start out as such, and a no-args
constructor and the implied starts-out-as-null state that goes with it is in fact mandatory' which happens with javax.validation.constraints.NotNull.
Various problems with spring have also been reported. See issue #287, issue #271, and issue #43. */
/** Matches the simple part of any annotation that lombok considers as indicative of NonNull status. */
public static final Pattern NON_NULL_PATTERN = Pattern.compile("^(?:nonnull)$", Pattern.CASE_INSENSITIVE);
/** Matches the simple part of any annotation that lombok considers as indicative of Nullable status. */
public static final Pattern NULLABLE_PATTERN = Pattern.compile("^(?:nullable|checkfornull)$", Pattern.CASE_INSENSITIVE);
public static final String DEFAULT_EXCEPTION_FOR_NON_NULL = "java.lang.NullPointerException";
/**
* Generates a getter name from a given field name.
*
* Strategy:
*
* - Reduce the field's name to its base name by stripping off any prefix (from {@code Accessors}). If the field name does not fit
* the prefix list, this method immediately returns {@code null}.
* - If {@code Accessors} has {@code fluent=true}, then return the basename.
* - Pick a prefix. 'get' normally, but 'is' if {@code isBoolean} is true.
* - Only if {@code isBoolean} is true: Check if the field starts with {@code is} followed by a non-lowercase character. If so, return the field name verbatim.
* - Check if the first character of the field is lowercase. If so, check if the second character
* exists and is title or upper case. If so, uppercase the first character. If not, titlecase the first character.
* - Return the prefix plus the possibly title/uppercased first character, and the rest of the field name.
*
*
* @param accessors Accessors configuration.
* @param fieldName the name of the field.
* @param isBoolean if the field is of type 'boolean'. For fields of type {@code java.lang.Boolean}, you should provide {@code false}.
* @return The getter name for this field, or {@code null} if this field does not fit expected patterns and therefore cannot be turned into a getter name.
*/
public static String toGetterName(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean) {
return toAccessorName(ast, accessors, fieldName, isBoolean, "is", "get", true);
}
/**
* Generates a setter name from a given field name.
*
* Strategy:
*
* - Reduce the field's name to its base name by stripping off any prefix (from {@code Accessors}). If the field name does not fit
* the prefix list, this method immediately returns {@code null}.
* - If {@code Accessors} has {@code fluent=true}, then return the basename.
* - Only if {@code isBoolean} is true: Check if the field starts with {@code is} followed by a non-lowercase character.
* If so, replace {@code is} with {@code set} and return that.
* - Check if the first character of the field is lowercase. If so, check if the second character
* exists and is title or upper case. If so, uppercase the first character. If not, titlecase the first character.
* - Return {@code "set"} plus the possibly title/uppercased first character, and the rest of the field name.
*
*
* @param accessors Accessors configuration.
* @param fieldName the name of the field.
* @param isBoolean if the field is of type 'boolean'. For fields of type {@code java.lang.Boolean}, you should provide {@code false}.
* @return The setter name for this field, or {@code null} if this field does not fit expected patterns and therefore cannot be turned into a getter name.
*/
public static String toSetterName(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean) {
return toAccessorName(ast, accessors, fieldName, isBoolean, "set", "set", true);
}
/**
* Generates a wither name from a given field name.
*
* Strategy:
*
* - Reduce the field's name to its base name by stripping off any prefix (from {@code Accessors}). If the field name does not fit
* the prefix list, this method immediately returns {@code null}.
* - Only if {@code isBoolean} is true: Check if the field starts with {@code is} followed by a non-lowercase character.
* If so, replace {@code is} with {@code with} and return that.
* - Check if the first character of the field is lowercase. If so, check if the second character
* exists and is title or upper case. If so, uppercase the first character. If not, titlecase the first character.
* - Return {@code "with"} plus the possibly title/uppercased first character, and the rest of the field name.
*
*
* @param accessors Accessors configuration.
* @param fieldName the name of the field.
* @param isBoolean if the field is of type 'boolean'. For fields of type {@code java.lang.Boolean}, you should provide {@code false}.
* @return The wither name for this field, or {@code null} if this field does not fit expected patterns and therefore cannot be turned into a getter name.
*/
public static String toWitherName(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean) {
return toAccessorName(ast, accessors, fieldName, isBoolean, "with", "with", false);
}
private static String toAccessorName(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean,
String booleanPrefix, String normalPrefix, boolean adhereToFluent) {
fieldName = fieldName.toString();
if (fieldName.length() == 0) return null;
if (Boolean.TRUE.equals(ast.readConfiguration(ConfigurationKeys.GETTER_CONSEQUENT_BOOLEAN))) isBoolean = false;
boolean explicitPrefix = accessors != null && accessors.isExplicit("prefix");
boolean explicitFluent = accessors != null && accessors.isExplicit("fluent");
Accessors ac = (explicitPrefix || explicitFluent) ? accessors.getInstance() : null;
List prefix = explicitPrefix ? Arrays.asList(ac.prefix()) : ast.readConfiguration(ConfigurationKeys.ACCESSORS_PREFIX);
boolean fluent = explicitFluent ? ac.fluent() : Boolean.TRUE.equals(ast.readConfiguration(ConfigurationKeys.ACCESSORS_FLUENT));
fieldName = removePrefix(fieldName, prefix);
if (fieldName == null) return null;
String fName = fieldName.toString();
if (adhereToFluent && fluent) return fName;
if (isBoolean && fName.startsWith("is") && fieldName.length() > 2 && !Character.isLowerCase(fieldName.charAt(2))) {
// The field is for example named 'isRunning'.
return booleanPrefix + fName.substring(2);
}
return buildAccessorName(isBoolean ? booleanPrefix : normalPrefix, fName);
}
/**
* Returns all names of methods that would represent the getter for a field with the provided name.
*
* For example if {@code isBoolean} is true, then a field named {@code isRunning} would produce:
* {@code [isRunning, getRunning, isIsRunning, getIsRunning]}
*
* @param accessors Accessors configuration.
* @param fieldName the name of the field.
* @param isBoolean if the field is of type 'boolean'. For fields of type 'java.lang.Boolean', you should provide {@code false}.
*/
public static List toAllGetterNames(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean) {
return toAllAccessorNames(ast, accessors, fieldName, isBoolean, "is", "get", true);
}
/**
* Returns all names of methods that would represent the setter for a field with the provided name.
*
* For example if {@code isBoolean} is true, then a field named {@code isRunning} would produce:
* {@code [setRunning, setIsRunning]}
*
* @param accessors Accessors configuration.
* @param fieldName the name of the field.
* @param isBoolean if the field is of type 'boolean'. For fields of type 'java.lang.Boolean', you should provide {@code false}.
*/
public static List toAllSetterNames(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean) {
return toAllAccessorNames(ast, accessors, fieldName, isBoolean, "set", "set", true);
}
/**
* Returns all names of methods that would represent the wither for a field with the provided name.
*
* For example if {@code isBoolean} is true, then a field named {@code isRunning} would produce:
* {@code [withRunning, withIsRunning]}
*
* @param accessors Accessors configuration.
* @param fieldName the name of the field.
* @param isBoolean if the field is of type 'boolean'. For fields of type 'java.lang.Boolean', you should provide {@code false}.
*/
public static List toAllWitherNames(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean) {
return toAllAccessorNames(ast, accessors, fieldName, isBoolean, "with", "with", false);
}
private static List toAllAccessorNames(AST ast, AnnotationValues accessors, CharSequence fieldName, boolean isBoolean,
String booleanPrefix, String normalPrefix, boolean adhereToFluent) {
if (Boolean.TRUE.equals(ast.readConfiguration(ConfigurationKeys.GETTER_CONSEQUENT_BOOLEAN))) isBoolean = false;
if (!isBoolean) {
String accessorName = toAccessorName(ast, accessors, fieldName, false, booleanPrefix, normalPrefix, adhereToFluent);
return (accessorName == null) ? Collections.emptyList() : Collections.singletonList(accessorName);
}
boolean explicitPrefix = accessors != null && accessors.isExplicit("prefix");
boolean explicitFluent = accessors != null && accessors.isExplicit("fluent");
Accessors ac = (explicitPrefix || explicitFluent) ? accessors.getInstance() : null;
List prefix = explicitPrefix ? Arrays.asList(ac.prefix()) : ast.readConfiguration(ConfigurationKeys.ACCESSORS_PREFIX);
boolean fluent = explicitFluent ? ac.fluent() : Boolean.TRUE.equals(ast.readConfiguration(ConfigurationKeys.ACCESSORS_FLUENT));
fieldName = removePrefix(fieldName, prefix);
if (fieldName == null) return Collections.emptyList();
List baseNames = toBaseNames(fieldName, isBoolean, fluent);
Set names = new HashSet();
for (String baseName : baseNames) {
if (adhereToFluent && fluent) {
names.add(baseName);
} else {
names.add(buildAccessorName(normalPrefix, baseName));
if (!normalPrefix.equals(booleanPrefix)) names.add(buildAccessorName(booleanPrefix, baseName));
}
}
return new ArrayList(names);
}
private static List toBaseNames(CharSequence fieldName, boolean isBoolean, boolean fluent) {
List baseNames = new ArrayList();
baseNames.add(fieldName.toString());
// isPrefix = field is called something like 'isRunning', so 'running' could also be the fieldname.
String fName = fieldName.toString();
if (fName.startsWith("is") && fName.length() > 2 && !Character.isLowerCase(fName.charAt(2))) {
String baseName = fName.substring(2);
if (fluent) {
baseNames.add("" + Character.toLowerCase(baseName.charAt(0)) + baseName.substring(1));
} else {
baseNames.add(baseName);
}
}
return baseNames;
}
/**
* @param prefix Something like {@code get} or {@code set} or {@code is}.
* @param suffix Something like {@code running}.
* @return prefix + smartly title-cased suffix. For example, {@code setRunning}.
*/
public static String buildAccessorName(String prefix, String suffix) {
if (suffix.length() == 0) return prefix;
if (prefix.length() == 0) return suffix;
char first = suffix.charAt(0);
if (Character.isLowerCase(first)) {
boolean useUpperCase = suffix.length() > 2 &&
(Character.isTitleCase(suffix.charAt(1)) || Character.isUpperCase(suffix.charAt(1)));
suffix = String.format("%s%s",
useUpperCase ? Character.toUpperCase(first) : Character.toTitleCase(first),
suffix.subSequence(1, suffix.length()));
}
return String.format("%s%s", prefix, suffix);
}
}
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