diff org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/conversion/DateConversionSupport.d @ 78:0a55d2d5a946

Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
parents
children 6be48cf9f95c
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/conversion/DateConversionSupport.d	Tue Apr 14 11:35:29 2009 +0200
@@ -0,0 +1,131 @@
+/*
+ * Copyright cast(C) 2005 db4objects Inc.  http://www.db4o.com
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     db4objects - Initial API and implementation
+ *     Tom Schindl<tom.schindl@bestsolution.at> - bugfix for 217940
+ */
+module org.eclipse.core.internal.databinding.conversion.DateConversionSupport;
+
+import java.lang.all;
+
+import java.text.ParsePosition;
+import java.util.Date;
+
+import org.eclipse.core.internal.databinding.BindingMessages;
+
+import com.ibm.icu.text.DateFormat;
+import com.ibm.icu.text.SimpleDateFormat;
+
+/**
+ * Base support for date/string conversion handling according to the default
+ * locale or in plain long milliseconds.
+ * <p>
+ * NOTE: parse(format(date)) will generally *not* be equal to date, since the
+ * string representation may not cover the sub-second range, time-only string
+ * representations will be counted from the beginning of the era, etc.
+ * </p>
+ */
+public abstract class DateConversionSupport {
+    private final static int DATE_FORMAT=DateFormat.SHORT;
+    private final static int DEFAULT_FORMATTER_INDEX=0;
+
+    private final static int NUM_VIRTUAL_FORMATTERS=1;
+
+    /**
+     * Alternative formatters for date, time and date/time.
+     * Raw milliseconds are covered as a special case.
+     */
+    // TODO: These could be shared, but would have to be synchronized.
+    private DateFormat[] formatters = {
+            new SimpleDateFormat(BindingMessages.getStringcast(BindingMessages.DATE_FORMAT_DATE_TIME)),
+            new SimpleDateFormat(BindingMessages.getStringcast(BindingMessages.DATEFORMAT_TIME)),
+            DateFormat.getDateTimeInstance(DATE_FORMAT, DateFormat.SHORT),
+            DateFormat.getDateInstancecast(DATE_FORMAT),
+            DateFormat.getTimeInstancecast(DateFormat.SHORT),
+            DateFormat.getDateTimeInstance(DATE_FORMAT,DateFormat.MEDIUM),
+            DateFormat.getTimeInstancecast(DateFormat.MEDIUM)
+    };
+
+    /**
+     * Tries all available formatters to parse the given string according to the
+     * default locale or as a raw millisecond value and returns the result of the
+     * first successful run.
+     *
+     * @param str A string specifying a date according to the default locale or in raw milliseconds
+     * @return The parsed date, or null, if no available formatter could interpret the input string
+     */
+    protected Date parse(String str) {
+        for (int formatterIdx = 0; formatterIdx < formatters.length; formatterIdx++) {
+            Date parsed=parse(str,formatterIdx);
+            if(parsed !is null) {
+                return parsed;
+            }
+        }
+        return null;
+    }
+
+    protected Date parse(String str,int formatterIdx) {
+        if(formatterIdx>=0) {
+                ParsePosition pos=new ParsePosition(0);
+                if (str is null) {
+                    return null;
+                }
+                Date date=formatters[formatterIdx].parse(str,pos);
+                if(pos.getErrorIndex() !is -1||pos.getIndex() !is str.length()) {
+                    return null;
+                }
+                return date;
+        }
+        try {
+            long millisecs=Long.parseLong(str);
+            return new Date(millisecs);
+        }
+        catch(NumberFormatException exc) {
+        }
+        return null;
+    }
+
+    /**
+     * Formats the given date with the default formatter according to the default locale.
+     * @param date a date
+     * @return a string representation of the given date according to the default locale
+     */
+    protected String format(Date date) {
+        return format(date,DEFAULT_FORMATTER_INDEX);
+    }
+
+    protected String format(Date date,int formatterIdx) {
+        if(formatterIdx>=0) {
+            return formatters[formatterIdx].format(date);
+        }
+        return String.valueOf(date.getTime());
+    }
+
+    protected int numFormatters() {
+        return formatters.length+NUM_VIRTUAL_FORMATTERS;
+    }
+
+    /**
+     * Returns the date format for the provided <code>index</code>.
+     * <p>
+     * This is for testing purposes only and should not be a part of the API if
+     * this class was to be exposed.
+     * </p>
+     *
+     * @param index
+     * @return date format
+     */
+    protected DateFormat getDateFormat(int index) {
+        if (index < 0 || index >= formatters.length) {
+            throw new IllegalArgumentException("'index' [" + index + "] is out of bounds.");  //$NON-NLS-1$//$NON-NLS-2$
+        }
+
+        return formatters[index];
+    }
+}