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Annotation Processor to generate JPA 3 static metamodel classes

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.jpamodelgen.util;

import java.util.Locale;

/**
 * @author Hardy Ferentschik
 */
public final class StringUtil {
	private static final String NAME_SEPARATOR = ".";
	private static final String PROPERTY_PREFIX_GET = "get";
	private static final String PROPERTY_PREFIX_IS = "is";
	private static final String PROPERTY_PREFIX_HAS = "has";

	private StringUtil() {
	}

	public static String determineFullyQualifiedClassName(String defaultPackage, String name) {
		if ( isFullyQualified( name ) ) {
			return name;
		}
		else {
			return defaultPackage + NAME_SEPARATOR + name;
		}
	}

	public static boolean isFullyQualified(String name) {
		return name.contains( NAME_SEPARATOR );
	}

	public static String packageNameFromFqcn(String fqcn) {
		return fqcn.substring( 0, fqcn.lastIndexOf( NAME_SEPARATOR ) );
	}

	public static String classNameFromFqcn(String fqcn) {
		return fqcn.substring( fqcn.lastIndexOf( NAME_SEPARATOR ) + 1 );
	}

	public static boolean isProperty(String methodName, String returnTypeAsString) {
		if ( methodName == null || "void".equals( returnTypeAsString ) ) {
			return false;
		}

		if ( isValidPropertyName( methodName, PROPERTY_PREFIX_GET ) ) {
			return true;
		}

		if ( isValidPropertyName( methodName, PROPERTY_PREFIX_IS ) || isValidPropertyName( methodName, PROPERTY_PREFIX_HAS ) ) {
			return isBooleanGetter( returnTypeAsString );
		}

		return false;
	}

	private static boolean isBooleanGetter(String type) {
		return "Boolean".equals( type ) || "java.lang.Boolean".equals( type );
	}

	private static boolean isValidPropertyName(String name, String prefix) {
		if ( !name.startsWith( prefix ) ) {
			return false;
		}

		// the name has to start with the prefix and have at least one more character
		return name.length() >= prefix.length() + 1;
	}

	public static String getPropertyName(String name) {
		String tmp = name;
		if ( name.startsWith( PROPERTY_PREFIX_GET ) ) {
			tmp = name.replaceFirst( PROPERTY_PREFIX_GET, "" );
		}
		else if ( name.startsWith( PROPERTY_PREFIX_IS ) ) {
			tmp = name.replaceFirst( PROPERTY_PREFIX_IS, "" );
		}
		else if ( name.startsWith( PROPERTY_PREFIX_HAS ) ) {
			tmp = name.replaceFirst( PROPERTY_PREFIX_HAS, "" );
		}
		return decapitalize( tmp );
	}

	public static String decapitalize(String string) {
		if ( string == null || string.isEmpty() || startsWithSeveralUpperCaseLetters( string ) ) {
			return string;
		}
		else {
			return string.substring( 0, 1 ).toLowerCase(Locale.ROOT) + string.substring( 1 );
		}
	}

	public static String getUpperUnderscoreCaseFromLowerCamelCase(String lowerCamelCaseString){
		return lowerCamelCaseString.replaceAll("(.)(\\p{Upper})", "$1_$2").toUpperCase();
	}

	private static boolean startsWithSeveralUpperCaseLetters(String string) {
		return string.length() > 1 &&
				Character.isUpperCase( string.charAt( 0 ) ) &&
				Character.isUpperCase( string.charAt( 1 ) );
	}
}