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/* *******************************************************************
* Copyright (c) 1999-2001 Xerox Corporation,
* 2002 Palo Alto Research Center, Incorporated (PARC).
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v 2.0
* which accompanies this distribution and is available at
* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
*
* Contributors:
* Xerox/PARC initial implementation
* ******************************************************************/
package org.aspectj.bridge;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* This handler accumulates messages. To control messages accumulated, clients can ignore messages of a given kind, or install a
* listener/interceptor. The interceptor handles all messages (even null) first, and can halt further processing/accumlation by
* returning true. Clients can obtain messages accumulated using the get... methods. XXX this does not permit messages to be
* removed.
*
* @author PARC
* @author Andy Clement
*/
public class MessageHandler implements IMessageHolder {
/** messages accumulated */
protected final ArrayList messages;
/** kinds of messages to be ignored */
protected final List ignoring;
/** result of handleMessage(..) for messages not accumulated (ignored) */
protected boolean handleMessageResult;
/** listener which can halt processing by returning true */
protected IMessageHandler interceptor;
/**
* same as MessageHandler(false)
*/
public MessageHandler() {
this(false);
}
/**
* @param accumulateOnly the result of handleMessage (i.e., if true, then only accumulate messages - stop processing
*/
public MessageHandler(boolean accumulateOnly) {
messages = new ArrayList<>();
ignoring = new ArrayList<>();
init(accumulateOnly);
ignore(IMessage.WEAVEINFO); // Off by default, need to explicitly be enabled (see -showWeaveInfo)
}
/**
* Initialize this, removing any messages accumulated, kinds being ignored, or interceptor. Assume that this should return false
* from handleMessage(..).
*/
public void init() {
init(false);
}
/**
* Initialize this, removing any messages accumulated, kinds being ignored, or interceptor.
*
* @param accumulateOnly boolean value returned from handleMessage after accumulating in list
*/
public void init(boolean accumulateOnly) {
handleMessageResult = accumulateOnly;
if (0 < messages.size()) {
messages.clear();
}
if (0 < ignoring.size()) {
boolean ignoringWeaveMessages = isIgnoring(IMessage.WEAVEINFO);
ignoring.clear();
if (ignoringWeaveMessages) {
ignore(IMessage.WEAVEINFO);
}
}
if (null != interceptor) {
interceptor = null;
}
}
/**
* Clear the messages without changing other behavior.
*/
public void clearMessages() {
if (0 < messages.size()) {
messages.clear();
}
}
// ---------------------- IMessageHandler implementation
/**
* This implementation accumulates message. If an interceptor is installed and returns true (message handled), then processing
* halts and the message is not accumulated.
*
* @see org.aspectj.bridge.IMessageHandler#handleMessage(IMessage)
* @return true on interception or the constructor value otherwise
*/
public boolean handleMessage(IMessage message) {
if ((null != interceptor) && (interceptor.handleMessage(message))) {
return true;
}
if (null == message) {
throw new IllegalArgumentException("null message");
}
if (!ignoring.contains(message.getKind())) {
messages.add(message);
}
return handleMessageResult;
}
/**
* @return true if this kind has been flagged to be ignored.
* @see #ignore(IMessage.Kind)
* @see org.aspectj.bridge.IMessageHandler#isIgnoring(Kind)
*/
public boolean isIgnoring(IMessage.Kind kind) {
return ((null != kind) && (ignoring.contains(kind)));
}
// ---------------------- end of IMessageHandler implementation
/**
* Set a message kind to be ignored from now on
*/
public void ignore(IMessage.Kind kind) { // XXX sync
if ((null != kind) && (!ignoring.contains(kind))) {
ignoring.add(kind);
}
}
/**
* Remove a message kind from the list of those ignored from now on.
*/
public void dontIgnore(IMessage.Kind kind) {
if (null != kind) {
ignoring.remove(kind);
}
}
/**
* @see org.aspectj.bridge.IMessageHolder#hasAnyMessage(Kind, boolean)
*/
public boolean hasAnyMessage(final IMessage.Kind kind, final boolean orGreater) {
if (null == kind) {
return (0 < messages.size());
}
if (!orGreater) {
for (IMessage m : messages) {
if (kind == m.getKind()) {
return true;
}
}
} else {
for (IMessage m : messages) {
if (kind.isSameOrLessThan(m.getKind())) {
return true;
}
}
}
return false;
}
/**
* @return number of messages accumulated of a given kind
*/
public int numMessages(IMessage.Kind kind, final boolean orGreater) {
if (null == kind) {
return messages.size();
}
int result = 0;
if (!orGreater) {
for (IMessage m : messages) {
if (kind == m.getKind()) {
result++;
}
}
} else {
for (IMessage m : messages) {
if (kind.isSameOrLessThan(m.getKind())) {
result++;
}
}
}
return result;
}
/**
* @see org.aspectj.bridge.IMessageHolder#getUnmodifiableListView()
*/
public List getUnmodifiableListView() {
return Collections.unmodifiableList(messages);
}
/**
* Get all messages or those of a specific kind. Pass null to get all kinds.
*
* @param kind the IMessage.Kind expected, or null for all messages
* @return IMessage[] of messages of the right kind
*/
public IMessage[] getMessages(IMessage.Kind kind, final boolean orGreater) {
if (null == kind) {
return messages.toArray(IMessage.RA_IMessage);
}
ArrayList result = new ArrayList<>();
if (!orGreater) {
for (IMessage m : messages) {
if (kind == m.getKind()) {
result.add(m);
}
}
} else {
for (IMessage m : messages) {
if (kind.isSameOrLessThan(m.getKind())) {
result.add(m);
}
}
}
if (0 == result.size()) {
return IMessage.RA_IMessage;
}
return result.toArray(IMessage.RA_IMessage);
}
/**
* @return array of error messages, or IMessage.NONE
*/
public IMessage[] getErrors() {
return getMessages(IMessage.ERROR, false);
}
/**
* @return array of warning messages, or IMessage.NONE
*/
public IMessage[] getWarnings() {
return getMessages(IMessage.WARNING, false);
}
/**
* Set the interceptor which gets any message before we process it.
*
* @param interceptor the IMessageHandler passed the message. Pass null to remove the old interceptor.
*/
public void setInterceptor(IMessageHandler interceptor) {
this.interceptor = interceptor;
}
/**
* @return String containing list of messages
*/
public String toString() {
if (0 == messages.size()) {
return "MessageHandler: no messages";
} else {
return "MessageHandler: " + messages;
}
}
}