com.jgoodies.validation.ValidationResult Maven / Gradle / Ivy
/*
* Copyright (c) 2003-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Karsten Lentzsch nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.validation;
import static com.jgoodies.common.base.Preconditions.checkArgument;
import static com.jgoodies.common.base.Preconditions.checkNotNull;
import java.io.Serializable;
import java.util.*;
import com.jgoodies.validation.message.SimpleValidationMessage;
/**
* Describes a validation result as a list of ValidationMessages.
* You can add single validation messages, single text messages,
* lists of messages, and all messages from another ValidationResult.
*
* @author Karsten Lentzsch
* @version $Revision: 1.24 $
*
* @see ValidationMessage
* @see Validator
*/
public final class ValidationResult implements Iterable,
Serializable {
/**
* A constant for an empty and unmodifiable validation result.
*/
public static final ValidationResult EMPTY =
new ValidationResult(Collections.emptyList(), false);
/**
* Holds a List of ValidationMessages.
*/
private final List messageList;
/**
* Describes if this result can be modified or not.
*/
private final boolean modifiable;
// Instance Creation ******************************************************
/**
* Constructs an empty modifiable ValidationResult.
*/
public ValidationResult() {
this(new ArrayList(), true);
}
/**
* Constructs a ValidationResult on the given message list.
* Used for constructing the {@code EMPTY} validation result.
*
* @param messageList an initial message list
* @param modifiable true to allow modifications, false to prevent them
*/
private ValidationResult(List messageList, boolean modifiable) {
this.messageList = messageList;
this.modifiable = modifiable;
}
/**
* Returns an unmodifiable view of the given ValidationResult.
* Useful to provide users with "read-only" access to internal results,
* or to indicate to other validation result processors that a result
* is not intended to be modified. Attempts to modify the returned
* validation result throw an {@code UnsupportedOperationException}.
*
* @param validationResult the result for which an unmodifiable view is to be returned
* @return an unmodifiable view of the specified validation result
*/
public static ValidationResult unmodifiableResult(ValidationResult validationResult) {
return validationResult.modifiable
? new ValidationResult(new ArrayList(validationResult.messageList),
false)
: validationResult;
}
// Adding Messages ********************************************************
/**
* Adds a new ValidationMessage to the list of messages.
*
* @param validationMessage the message to add
*
* @throws NullPointerException if the message is {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
* @throws IllegalArgumentException if the severity is {@code OK}
*
* @see #addError(String)
* @see #addWarning(String)
*/
public void add(ValidationMessage validationMessage) {
checkModifiable();
checkNotNull(validationMessage, "The validation message must not be null.");
checkArgument(validationMessage.severity() != Severity.OK,
"You must not add a validation message with severity OK.");
messageList.add(validationMessage);
}
/**
* Creates and adds an error message to the list of validation messages
* using the given text.
*
* @param text the error text to add
*
* @throws NullPointerException if the message text {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
*
* @see #add(ValidationMessage)
* @see #addWarning(String)
*/
public void addError(String text) {
addError(text, null);
}
/**
* Creates and adds an error message to the list of validation messages
* using the given text and validation message key.
*
* @param text the error text to add
* @param key the optional messages key
*
* @throws NullPointerException if the message text {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
*
* @see #add(ValidationMessage)
* @see #addWarning(String)
*
* @since 2.3
*/
public void addError(String text, String key) {
checkModifiable();
add(new SimpleValidationMessage(text, Severity.ERROR, key));
}
/**
* Creates and adds a warning message to the list of validation messages
* using the given text.
*
* @param text the warning text to add
*
* @throws NullPointerException if the message text {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
*
* @see #add(ValidationMessage)
* @see #addError(String)
*/
public void addWarning(String text) {
addWarning(text, null);
}
/**
* Creates and adds a warning message to the list of validation messages
* using the given text.
*
* @param text the warning text to add
* @param key the optional message key
*
* @throws NullPointerException if the message text {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
*
* @see #add(ValidationMessage)
* @see #addError(String)
*
* @since 2.3
*/
public void addWarning(String text, String key) {
checkModifiable();
add(new SimpleValidationMessage(text, Severity.WARNING, key));
}
/**
* Creates and adds an info message to the list of validation messages
* using the given text.
*
* @param text the info text to add
*
* @throws NullPointerException if the message text {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
*
* @see #add(ValidationMessage)
*/
public void addInfo(String text) {
addInfo(text, null);
}
/**
* Creates and adds a info message to the list of validation messages
* using the given text and key.
*
* @param text the info text to add
* @param key the optional message key
*
* @throws NullPointerException if the message text {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
*
* @see #add(ValidationMessage)
*/
public void addInfo(String text, String key) {
checkModifiable();
add(new SimpleValidationMessage(text, Severity.INFO, key));
}
/**
* Adds all messages from the given list to this validation result.
*
* @param messages the messages to be added
*
* @throws NullPointerException if the messages list is {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
* @throws IllegalArgumentException if the messages list contains
* a message with severity {@code OK}
*
* @see #addAllFrom(ValidationResult)
*/
public void addAll(List messages) {
checkModifiable();
checkNotNull(messages, "The messages list must not be null.");
for (ValidationMessage message : messages) {
checkArgument(message.severity() != Severity.OK,
"You must not add a validation message with severity OK.");
}
messageList.addAll(messages);
}
/**
* Adds all messages from the given ValidationResult
* to the list of messages that this validation result holds.
*
* @param validationResult the validation result to add messages from
*
* @throws NullPointerException if the validation result is {@code null}
* @throws UnsupportedOperationException if the result is unmodifiable
*
* @see #addAll(List)
*/
public void addAllFrom(ValidationResult validationResult) {
checkModifiable();
checkNotNull(validationResult, "The validation result to add must not be null.");
addAll(validationResult.messageList);
}
// List Operations ********************************************************
/**
* Checks and answers whether this validation result contains no messages.
*
* @return true if this validation result contains no messages
*
* @see #hasErrors()
* @see #hasWarnings()
*/
public boolean isEmpty() {
return messageList.isEmpty();
}
/**
* Returns the number of messages in this result.
*
* @return the number of elements in this list
*/
public int size() {
return messageList.size();
}
/**
* Checks and answers whether this result contains the specified message.
* More formally, returns {@code true} if and only if this result
* contains at least one message {@code m} such that
* {@code (message.equals(m))}.
*
* @param message message whose presence in this result is to be tested
* @return {@code true} if this result contains the specified message
* @throws NullPointerException if the specified message is
* {@code null}
*/
public boolean contains(ValidationMessage message) {
return messageList.contains(message);
}
/**
* Returns the message at the specified position in this result.
*
* @param index index of the message to return.
* @return the ValidationMessage at the specified position in this result's
* underlying message list.
*
* @throws IndexOutOfBoundsException if the index is out of range (index
* < 0 || index >= size()).
*
* @since 2.1.0
*/
public ValidationMessage get(int index) {
return messageList.get(index);
}
/**
* Returns an iterator over the validation messages in this result
* in proper sequence.
*
* @return an iterator over the ValidationMessages in this result
* in proper sequence.
*
* @since 2.1.0
*/
@Override
public Iterator iterator() {
return messageList.iterator();
}
/**
* Returns an unmodifiable view of the portion of this result between
* the specified {@code fromIndex}, inclusive, and {@code toIndex},
* exclusive.
* (If {@code fromIndex} and {@code toIndex} are equal,
* the returned result is empty.) The returned result is a copy,
* so changes in the returned result won't affect this result,
* and vice-versa.
*
* @param fromIndex low end point (inclusive) of the subResult
* @param toIndex high end point (exclusive) of the subResult
* @return a view of the specified range within this result.
*
* @throws IndexOutOfBoundsException for an illegal end point index value
* (fromIndex < 0 || toIndex > size || fromIndex > toIndex).
*
* @see #subResult(Object)
*/
public ValidationResult subResult(int fromIndex, int toIndex) {
List messages = messageList.subList(fromIndex, toIndex);
return new ValidationResult(messages, false);
}
/**
* Returns an unmodifiable sub result of this result that consists of
* all messages that share the specified message key. If the specified key
* is {@code null}, this method returns an empty result.
* The returned result is a copy, so changes in this result won't affect it.
*
* @param messageKey the key to look for, can be {@code null}
* @return a sub result containing all messages that share the
* specified key, or the empty result if the key is {@code null}
*
* @see #subResult(int, int)
*/
public ValidationResult subResult(Object messageKey) {
if (messageKey == null) {
return EMPTY;
}
List messages = new ArrayList();
for (ValidationMessage message : messageList) {
if (messageKey.equals(message.key())) {
messages.add(message);
}
}
return new ValidationResult(messages, false);
}
/**
* Returns an unmodifiable sub result of this result that consists of
* all messages that share the specified message keys. If the array of keys
* is {@code null}, this method returns an empty result.
* The returned result is a copy, so changes in this result won't affect it.
*
* @param messageKeys the keys to look for, can be {@code null}
* @return a sub result containing all messages that share the specified
* keys, or the empty result if the key array is {@code null}
*
* @see #subResult(int, int)
*
* @since 1.4
*/
public ValidationResult subResult(Object[] messageKeys) {
if (messageKeys == null) {
return EMPTY;
}
List messages = new ArrayList();
for (ValidationMessage message : messageList) {
Object messageKey = message.key();
for (Object key : messageKeys) {
if (messageKey.equals(key)) {
messages.add(message);
}
}
}
return new ValidationResult(messages, false);
}
/**
* Creates and returns an unmodifiable Map that maps the message keys
* of this validation result to unmodifiable sub results that share the key.
*
* More formally:
* for each key {@code key} in the created map {@code map},
* {@code map.get(key)} returns a {@code ValidationResult}
* {@code result}, such that for each {@code ValidationMessage}
* {@code message} in {@code result} we have:
* {@code message.key().equals(key)}.
*
* @return a mapping from message key to an associated validation result
* that consist only of messages with this key
*
* @see ValidationMessage#key()
*/
public Map keyMap() {
Map> messageMap =
new HashMap>();
for (ValidationMessage message : messageList) {
Object key = message.key();
List associatedMessages = messageMap.get(key);
if (associatedMessages == null) {
associatedMessages = new LinkedList();
messageMap.put(key, associatedMessages);
}
associatedMessages.add(message);
}
Map resultMap =
new HashMap(messageMap.size());
for (Map.Entry> entry : messageMap.entrySet()) {
Object key = entry.getKey();
List messages = entry.getValue();
resultMap.put(key, new ValidationResult(messages, false));
}
return Collections.unmodifiableMap(resultMap);
}
// Requesting Information *************************************************
/**
* Returns the highest severity of this result's messages,
* {@code Severity.OK} if there are no messages.
*
* @return the highest severity of this result's messages,
* {@code Severity.OK} if there are no messages
*
* @see #hasMessages()
* @see #hasErrors()
* @see #hasWarnings()
*/
public Severity getSeverity() {
return getSeverity(messageList);
}
/**
* Checks and answers whether this validation result has messages or not.
*
* @return true if there are messages, false if not
*
* @see #getSeverity()
* @see #hasErrors()
* @see #hasWarnings()
*/
public boolean hasMessages() {
return !isEmpty();
}
/**
* Checks and answers whether this validation result
* contains a message of type {@code ERROR}.
*
* @return true if there are error messages, false if not
*
* @see #getSeverity()
* @see #hasMessages()
* @see #hasWarnings()
*/
public boolean hasErrors() {
return hasSeverity(messageList, Severity.ERROR);
}
/**
* Checks and answers whether this validation result
* contains a message of type {@code WARNING}.
*
* Note that this method checks for warning messages only.
* It'll return false, if there are errors but no warnings.
* If you want to test whether this result contains
* warning and/or errors, use {@code #hasMessages} instead.
*
* @return true if there are warnings, false if not
*
* @see #getSeverity()
* @see #hasMessages()
* @see #hasErrors()
*/
public boolean hasWarnings() {
return hasSeverity(messageList, Severity.WARNING);
}
/**
* Checks and answers whether this validation result
* contains a message of type {@code INFO}.
*
* @return true if there are info messages, false if not
*
* @see #getSeverity()
* @see #hasMessages()
* @see #hasErrors()
* @see #hasWarnings()
*/
public boolean hasInfos() {
return hasSeverity(messageList, Severity.INFO);
}
/**
* Returns an unmodifiable List of all validation messages.
*
* @return the {@code List} of all validation messages
*
* @see #getErrors()
* @see #getWarnings()
*/
public List getMessages() {
return Collections.unmodifiableList(messageList);
}
/**
* Returns an unmodifiable List of the validation messages
* that indicate errors.
*
* @return the List of error validation messages
*
* @see #getMessages()
* @see #getWarnings()
*/
public List getErrors() {
return getMessagesWithSeverity(messageList, Severity.ERROR);
}
/**
* Returns an unmodifiable List of the validation messages
* that indicate warnings.
*
* @return the List of validation warnings
*
* @see #getMessages()
* @see #getErrors()
*/
public List getWarnings() {
return getMessagesWithSeverity(messageList, Severity.WARNING);
}
/**
* Returns an unmodifiable List of the validation messages
* that indicate informations.
*
* @return the List of info validation messages
*
* @see #getMessages()
* @see #getErrors()
* @see #getWarnings()
*/
public List getInfos() {
return getMessagesWithSeverity(messageList, Severity.INFO);
}
// Requesting State *******************************************************
/**
* Returns if this validation result is modifiable or not.
* Can be used to cache data from unmodifiable result.
*
* @return true if modifiable, false if unmodifiable
*/
public boolean isModifiable() {
return modifiable;
}
// String Conversion ******************************************************
/**
* Returns a string representation of the message list.
*
* @return a string representation of the message list
*/
public String getMessagesText() {
return getMessagesText(messageList);
}
/**
* Returns a string representation intended for debugging purposes.
*
* @return a string representation intended for debugging
* @see Object#toString()
*/
@Override
public String toString() {
if (isEmpty()) {
return "Empty ValidationResult";
}
StringBuilder builder = new StringBuilder();
builder.append(modifiable ? "Modifiable" : "Unmodifiable");
builder.append(" ValidationResult:");
for (ValidationMessage message : messageList) {
builder.append("\n\t").append(message);
}
return builder.toString();
}
// Comparison and Hashing *************************************************
/**
* Compares the specified object with this validation result for equality.
* Returns {@code true} if and only if the specified object is also
* a validation result, both results have the same size, and all
* corresponding pairs of validation messages in the two validation results
* are equal. (Two validation messages {@code m1} and
* {@code m2} are equal if {@code (m1==null ? m2==null :
* m1.equals(m2))}.) In other words, two validation results
* are defined to be equal if and only if they contain the same
* validation messages in the same order.
*
* This implementation first checks if the specified object is this
* validation result. If so, it returns {@code true};
* if not, it checks if the specified object is a validation result.
* If not, it returns {@code false}; if so, it checks and returns
* if the lists of messages in both results are equal.
*
* @param o the object to be compared for equality with this validation result.
*
* @return {@code true} if the specified object is equal
* to this validation result.
*
* @see List#equals(java.lang.Object)
* @see Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof ValidationResult)) {
return false;
}
return messageList.equals(((ValidationResult) o).messageList);
}
/**
* Returns the hash code value for this validation result. This
* implementation returns the hash from the List of messages.
*
* @return the hash code value for this validation result.
*
* @see List#hashCode()
* @see Object#hashCode()
*/
@Override
public int hashCode() {
return messageList.hashCode();
}
// Helper Code ************************************************************
/**
* Throws an {@link UnsupportedOperationException} if this
* completion manager is unmodifiable.
*/
private void checkModifiable() {
if (!modifiable) {
throw new UnsupportedOperationException(
"This validation result is unmodifiable.");
}
}
/**
* Returns the highest severity of this result's messages,
* {@code Severity.OK} if there are no messages.
* A single validation message can have only the severity
* error or warning. Hence, this method returns the error severity
* if there's at least one error message; and it returns
* the warning severity, otherwise - assuming that there are
* no other severities.
*
* @param messages the List of ValidationMessages to check
* @return the highest severity of this result's messages,
* {@code Severity.OK} if there are no messages
*/
private static Severity getSeverity(List messages) {
Severity severity = Severity.OK;
for (ValidationMessage message : messages) {
severity = Severity.max(severity, message.severity());
if (severity.ordinal() == 0) {
// we found the maximum severity.
break;
}
}
return severity;
}
/**
* Checks and answers whether the given list of validation messages
* includes message with the specified Severity.
*
* @param messages the List of ValidationMessages to check
* @param severity the Severity to check
* @return true if the given messages list includes error messages,
* false if not
*/
private static boolean hasSeverity(
List messages, Severity severity) {
for (ValidationMessage message : messages) {
if (message.severity() == severity) {
return true;
}
}
return false;
}
/**
* Returns an unmodifiable List of ValidationMessage that
* that is the sublist of message with the given Severity.
*
* @param messages the List of ValidationMessages to iterate
* @param severity the Severity to look for
* @return the sublist of error messages
*/
private static List getMessagesWithSeverity(
List messages, Severity severity) {
List errorMessages = new ArrayList();
for (ValidationMessage message : messages) {
if (message.severity() == severity) {
errorMessages.add(message);
}
}
return Collections.unmodifiableList(errorMessages);
}
/**
* Returns a string representation of the given list of messages.
*
* @param messages the List of ValidationMessages to iterate
* @return a string representation of the given list of messages
*/
private static String getMessagesText(List messages) {
if (messages.isEmpty()) {
return "OK";
}
StringBuilder builder = new StringBuilder();
for (ValidationMessage message : messages) {
if (builder.length() > 0) {
builder.append('\n');
}
builder.append(message.formattedText());
}
return builder.toString();
}
}