Create dedicated Messages API

README.md

@@ -32,6 +32,47 @@ The project was relocated from <https://github.com/sonatype/sisu-build-api>. Als
 
 ## Provided APIs
 
+### Messages API
+
+The Messages API provides a modern, flexible way to create and manage build messages/markers that inform users in an IDE about issues in their files. It uses a builder pattern for constructing messages in a more convenient and extensible way compared to the legacy BuildContext message methods.
+
+**Key Features:**
+- Builder pattern for flexible message construction
+- Clear separation of concerns from resource operations
+- Support for error, warning, and info messages
+- File path-based message management
+- Optional line and column information
+- Optional exception cause association
+
+**Example Usage:**
+
+```java
+@Inject
+private Messages messages;
+
+public void execute() {
+    // Create an error message
+    messages.buildError(Paths.get("/path/to/file.java"))
+        .line(42)
+        .column(10)
+        .message("Syntax error")
+        .cause(exception)
+        .create();
+
+    // Create a warning message
+    messages.buildWarning(Paths.get("/path/to/file.java"))
+        .line(15)
+        .message("Deprecated method used")
+        .create();
+
+    // Clear messages for a specific file
+    messages.clear(Paths.get("/path/to/file.java"));
+
+    // Clear all messages
+    messages.clearAll();
+}
+```
+
 ### Progress
 
 The API allows a mojo to report progress in a way that is suitable to be shown as a progressbar as well as check if the user wants the mojo to gracefully abort its current operation.

src/main/java/org/codehaus/plexus/build/messages/DefaultMessages.java

@@ -0,0 +1,176 @@
+/*
+Copyright (c) 2008 Sonatype, Inc. All rights reserved.
+
+This program is licensed to you under the Apache License Version 2.0,
+and you may not use this file except in compliance with the Apache License Version 2.0.
+You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the Apache License Version 2.0 is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
+*/
+package org.codehaus.plexus.build.messages;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import java.nio.file.Path;
+
+import org.codehaus.plexus.build.BuildContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Default implementation of the Messages interface.
+ * <p>
+ * This implementation delegates to the BuildContext for compatibility with existing
+ * message handling infrastructure. It logs messages and calls the legacy BuildContext
+ * message API.
+ * </p>
+ */
+@Named("default")
+@Singleton
+public class DefaultMessages implements Messages {
+
+    private static final Logger logger = LoggerFactory.getLogger(DefaultMessages.class);
+
+    private final BuildContext buildContext;
+
+    /**
+     * Creates a new DefaultMessages instance.
+     *
+     * @param buildContext the BuildContext to which messages will be delegated
+     */
+    @Inject
+    public DefaultMessages(BuildContext buildContext) {
+        this.buildContext = buildContext;
+    }
+
+    @Override
+    public void clearAll() {
+        // This is a no-op in the default implementation
+        // Custom implementations may provide actual clearing functionality
+    }
+
+    @Override
+    public void clear(Path path) {
+        if (path != null) {
+            buildContext.removeMessages(path.toFile());
+        }
+    }
+
+    @Override
+    public MessageBuilder buildError(Path path) {
+        return build(MessageType.ERROR, path);
+    }
+
+    @Override
+    public MessageBuilder buildWarning(Path path) {
+        return build(MessageType.WARNING, path);
+    }
+
+    @Override
+    public MessageBuilder buildInfo(Path path) {
+        return build(MessageType.INFO, path);
+    }
+
+    @Override
+    public MessageBuilder build(MessageType type, Path path) {
+        return new MessageBuilder(type, path, this::handleMessage);
+    }
+
+    /**
+     * Handles a message by logging it and delegating to the BuildContext.
+     *
+     * @param message the message to handle
+     */
+    private void handleMessage(Message message) {
+        // Log the message
+        String logMessage = formatLogMessage(message);
+
+        switch (message.getType()) {
+            case ERROR:
+                logger.error(logMessage, message.getCause());
+                break;
+            case WARNING:
+                logger.warn(logMessage, message.getCause());
+                break;
+            case INFO:
+                logger.info(logMessage, message.getCause());
+                break;
+        }
+
+        // Delegate to BuildContext for compatibility
+        if (message.getPath() != null) {
+            int severity = mapTypeToSeverity(message.getType());
+            buildContext.addMessage(
+                    message.getPath().toFile(),
+                    message.getLine(),
+                    message.getColumn(),
+                    message.getMessage(),
+                    severity,
+                    message.getCause());
+        }
+    }
+
+    /**
+     * Formats a message for logging.
+     *
+     * @param message the message to format
+     * @return the formatted log message
+     */
+    private String formatLogMessage(Message message) {
+        StringBuilder sb = new StringBuilder();
+
+        if (message.getPath() != null) {
+            sb.append(message.getPath().toAbsolutePath());
+        }
+
+        if (message.getLine() > 0 && message.getColumn() > 0) {
+            sb.append(" [");
+            sb.append(message.getLine());
+            sb.append(':').append(message.getColumn());
+            sb.append("]");
+        } else if (message.getLine() > 0) {
+            sb.append(" [");
+            sb.append(message.getLine());
+            sb.append("]");
+        } else if (message.getColumn() > 0) {
+            sb.append(" [:");
+            sb.append(message.getColumn());
+            sb.append("]");
+        }
+
+        if (message.getMessage() != null) {
+            if (sb.length() > 0) {
+                sb.append(": ");
+            }
+            sb.append(message.getMessage());
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * Maps a MessageType to a BuildContext severity level.
+     *
+     * @param type the message type
+     * @return the corresponding BuildContext severity
+     */
+    private int mapTypeToSeverity(MessageType type) {
+        switch (type) {
+            case ERROR:
+                return BuildContext.SEVERITY_ERROR;
+            case WARNING:
+                return BuildContext.SEVERITY_WARNING;
+            case INFO:
+            default:
+                // There's no INFO severity in BuildContext (only WARNING and ERROR),
+                // so we map INFO messages to WARNING to ensure they are still visible in the IDE.
+                // Custom implementations may provide different mappings.
+                return BuildContext.SEVERITY_WARNING;
+        }
+    }
+}

src/main/java/org/codehaus/plexus/build/messages/Message.java

@@ -0,0 +1,89 @@
+/*
+Copyright (c) 2008 Sonatype, Inc. All rights reserved.
+
+This program is licensed to you under the Apache License Version 2.0,
+and you may not use this file except in compliance with the Apache License Version 2.0.
+You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the Apache License Version 2.0 is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
+*/
+package org.codehaus.plexus.build.messages;
+
+import java.nio.file.Path;
+
+/**
+ * Represents a message with all its parameters.
+ * This class holds the collected parameters for a message that can be created through the MessageBuilder.
+ */
+public class Message {
+    private final MessageType type;
+    private final Path path;
+    private final int line;
+    private final int column;
+    private final String message;
+    private final Throwable cause;
+
+    /**
+     * Creates a new message with the specified parameters.
+     *
+     * @param type the message type
+     * @param path the file path associated with this message
+     * @param line the line number (1-based, 0 for unknown)
+     * @param column the column number (1-based, 0 for unknown)
+     * @param message the message text
+     * @param cause the exception cause, can be null
+     */
+    public Message(MessageType type, Path path, int line, int column, String message, Throwable cause) {
+        this.type = type;
+        this.path = path;
+        this.line = line;
+        this.column = column;
+        this.message = message;
+        this.cause = cause;
+    }
+
+    /**
+     * @return the message type
+     */
+    public MessageType getType() {
+        return type;
+    }
+
+    /**
+     * @return the file path
+     */
+    public Path getPath() {
+        return path;
+    }
+
+    /**
+     * @return the line number (1-based, 0 for unknown)
+     */
+    public int getLine() {
+        return line;
+    }
+
+    /**
+     * @return the column number (1-based, 0 for unknown)
+     */
+    public int getColumn() {
+        return column;
+    }
+
+    /**
+     * @return the message text
+     */
+    public String getMessage() {
+        return message;
+    }
+
+    /**
+     * @return the exception cause, or null if none
+     */
+    public Throwable getCause() {
+        return cause;
+    }
+}