Copyright (c) 2000, 2016 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.util;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;

@SuppressWarnings({"rawtypes", "unchecked"})
public final class Messages {
	private static class MessagesProperties extends Properties {

		private static final int MOD_EXPECTED = Modifier.PUBLIC | Modifier.STATIC;
		private static final int MOD_MASK = MOD_EXPECTED | Modifier.FINAL;
		private static final long serialVersionUID = 1L;

		private final Map fields;

		public MessagesProperties(Field[] fieldArray, String bundleName) {
			super();
			final int len = fieldArray.length;
			this.fields = new HashMap(len * 2);
			for (int i = 0; i < len; i++) {
				this.fields.put(fieldArray[i].getName(), fieldArray[i]);
			}
		}

		@Override
		public synchronized Object put(Object key, Object value) {
			try {
				Field field = (Field) this.fields.get(key);
				if (field == null) {
					return null;
				}
				//can only set value of public static non-final fields
				if ((field.getModifiers() & MOD_MASK) != MOD_EXPECTED)
					return null;
				// Set the value into the field. We should never get an exception here because
				// we know we have a public static non-final field. If we do get an exception, silently
				// log it and continue. This means that the field will (most likely) be un-initialized and
				// will fail later in the code and if so then we will see both the NPE and this error.
				try {
					field.set(null, value);
				} catch (Exception e) {
					// ignore
				}
			} catch (SecurityException e) {
				// ignore
			}
			return null;
		}
	}


	private static String[] nlSuffixes;
	private static final String EXTENSION = ".properties"; //$NON-NLS-1$

	private static final String BUNDLE_NAME = "org.eclipse.jdt.internal.compiler.messages";//$NON-NLS-1$

	private Messages() {
		// Do not instantiate
	}

	public static String compilation_unresolvedProblem;
	public static String compilation_unresolvedProblems;
	public static String compilation_request;
	public static String compilation_loadBinary;
	public static String compilation_process;
	public static String compilation_write;
	public static String compilation_done;
	public static String compilation_units;
	public static String compilation_unit;
	public static String compilation_internalError;
	public static String compilation_beginningToCompile;
	public static String compilation_processing;
	public static String output_isFile;
	public static String output_notValidAll;
	public static String output_notValid;
	public static String problem_noSourceInformation;
	public static String problem_atLine;
	public static String abort_invalidAttribute;
	public static String abort_invalidExceptionAttribute;
	public static String abort_invalidOpcode;
	public static String abort_missingCode;
	public static String abort_againstSourceModel;
	public static String abort_externaAnnotationFile;
	public static String accept_cannot;
	public static String parser_incorrectPath;
	public static String parser_moveFiles;
	public static String parser_syntaxRecovery;
	public static String parser_regularParse;
	public static String parser_missingFile;
	public static String parser_corruptedFile;
	public static String parser_endOfFile;
	public static String parser_endOfConstructor;
	public static String parser_endOfMethod;
	public static String parser_endOfInitializer;
	public static String ast_missingCode;
	public static String constant_cannotCastedInto;
	public static String constant_cannotConvertedTo;
	public static String abort_againstPreviewNotAllowed;

	static {
		initializeMessages(BUNDLE_NAME, Messages.class);
	}

	
Bind the given message's substitution locations with the given string values.
Params:
message – the message to be manipulated
Returns:
the manipulated String/**
	 * Bind the given message's substitution locations with the given string values.
	 *
	 * @param message the message to be manipulated
	 * @return the manipulated String
	 */
	public static String bind(String message) {
		return bind(message, null);
	}

	
Bind the given message's substitution locations with the given string values.
Params:
message – the message to be manipulated
binding – the object to be inserted into the message
Returns:
the manipulated String/**
	 * Bind the given message's substitution locations with the given string values.
	 *
	 * @param message the message to be manipulated
	 * @param binding the object to be inserted into the message
	 * @return the manipulated String
	 */
	public static String bind(String message, Object binding) {
		return bind(message, new Object[] {binding});
	}

	
Bind the given message's substitution locations with the given string values.
Params:
message – the message to be manipulated
binding1 – An object to be inserted into the message
binding2 – A second object to be inserted into the message
Returns:
the manipulated String/**
	 * Bind the given message's substitution locations with the given string values.
	 *
	 * @param message the message to be manipulated
	 * @param binding1 An object to be inserted into the message
	 * @param binding2 A second object to be inserted into the message
	 * @return the manipulated String
	 */
	public static String bind(String message, Object binding1, Object binding2) {
		return bind(message, new Object[] {binding1, binding2});
	}

	
Bind the given message's substitution locations with the given string values.
Params:
message – the message to be manipulated
bindings – An array of objects to be inserted into the message
Returns:
the manipulated String/**
	 * Bind the given message's substitution locations with the given string values.
	 *
	 * @param message the message to be manipulated
	 * @param bindings An array of objects to be inserted into the message
	 * @return the manipulated String
	 */
	public static String bind(String message, Object[] bindings) {
		return MessageFormat.format(message, bindings);
	}

	/*
	 * Build an array of directories to search
	 */
	private static String[] buildVariants(String root) {
		if (nlSuffixes == null) {
			//build list of suffixes for loading resource bundles
			String nl = Locale.getDefault().toString();
			ArrayList result = new ArrayList(4);
			int lastSeparator;
			while (true) {
				result.add('_' + nl + EXTENSION);
				lastSeparator = nl.lastIndexOf('_');
				if (lastSeparator == -1)
					break;
				nl = nl.substring(0, lastSeparator);
			}
			//add the empty suffix last (most general)
			result.add(EXTENSION);
			nlSuffixes = (String[]) result.toArray(new String[result.size()]);
		}
		root = root.replace('.', '/');
		String[] variants = new String[nlSuffixes.length];
		for (int i = 0; i < variants.length; i++)
			variants[i] = root + nlSuffixes[i];
		return variants;
	}
	public static void initializeMessages(String bundleName, Class clazz) {
		// load the resource bundle and set the fields
		final Field[] fields = clazz.getDeclaredFields();
		load(bundleName, clazz.getClassLoader(), fields);

		// iterate over the fields in the class to make sure that there aren't any empty ones
		final int MOD_EXPECTED = Modifier.PUBLIC | Modifier.STATIC;
		final int MOD_MASK = MOD_EXPECTED | Modifier.FINAL;
		final int numFields = fields.length;
		for (int i = 0; i < numFields; i++) {
			Field field = fields[i];
			if ((field.getModifiers() & MOD_MASK) != MOD_EXPECTED)
				continue;
			try {
				// Set the value into the field if its empty. We should never get an exception here because
				// we know we have a public static non-final field. If we do get an exception, silently
				// log it and continue. This means that the field will (most likely) be un-initialized and
				// will fail later in the code and if so then we will see both the NPE and this error.
				if (field.get(clazz) == null) {
					String value = "Missing message: " + field.getName() + " in: " + bundleName; //$NON-NLS-1$ //$NON-NLS-2$
					field.set(null, value);
				}
			} catch (IllegalArgumentException | IllegalAccessException e) {
				// ignore
			}
		}
	}
	
Load the given resource bundle using the specified class loader.
/**
	 * Load the given resource bundle using the specified class loader.
	 */
	public static void load(final String bundleName, final ClassLoader loader, final Field[] fields) {
		final String[] variants = buildVariants(bundleName);
		// search the dirs in reverse order so the cascading defaults is set correctly
		for (int i = variants.length; --i >= 0;) {
			InputStream input = (loader == null)
				? ClassLoader.getSystemResourceAsStream(variants[i])
				: loader.getResourceAsStream(variants[i]);
			if (input == null) continue;
			try {
				final MessagesProperties properties = new MessagesProperties(fields, bundleName);
				properties.load(input);
			} catch (IOException e) {
				// ignore
			} finally {
				try {
					input.close();
				} catch (IOException e) {
					// ignore
				}
			}
		}
	}
}