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/*
 *  Copyright 2001-2009 Stephen Colebourne
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.facebook.presto.jdbc.internal.joda.time.convert;

import com.facebook.presto.jdbc.internal.joda.time.Chronology;
import com.facebook.presto.jdbc.internal.joda.time.DateTimeUtils;
import com.facebook.presto.jdbc.internal.joda.time.DateTimeZone;
import com.facebook.presto.jdbc.internal.joda.time.ReadablePartial;

/**
 * ReadablePartialConverter extracts partial fields and chronology from a ReadablePartial.
 *
 * @author Stephen Colebourne
 * @since 1.0
 */
class ReadablePartialConverter extends AbstractConverter
        implements PartialConverter {

    /**
     * Singleton instance.
     */
    static final ReadablePartialConverter INSTANCE = new ReadablePartialConverter();

    /**
     * Restricted constructor.
     */
    protected ReadablePartialConverter() {
        super();
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the chronology, which is taken from the ReadablePartial.
     * 
     * @param object  the ReadablePartial to convert, must not be null
     * @param zone  the specified zone to use, null means default zone
     * @return the chronology, never null
     */
    public Chronology getChronology(Object object, DateTimeZone zone) {
        return getChronology(object, (Chronology) null).withZone(zone);
    }

    /**
     * Gets the chronology, which is taken from the ReadableInstant.
     * 

* If the passed in chronology is non-null, it is used. * Otherwise the chronology from the instant is used. * * @param object the ReadablePartial to convert, must not be null * @param chrono the chronology to use, null means use that from object * @return the chronology, never null */ public Chronology getChronology(Object object, Chronology chrono) { if (chrono == null) { chrono = ((ReadablePartial) object).getChronology(); chrono = DateTimeUtils.getChronology(chrono); } return chrono; } /** * Extracts the values of the partial from an object of this converter's type. * The chrono parameter is a hint to the converter, should it require a * chronology to aid in conversion. * * @param fieldSource a partial that provides access to the fields. * This partial may be incomplete and only getFieldType(int) should be used * @param object the object to convert * @param chrono the chronology to use, which is the non-null result of getChronology() * @return the array of field values that match the fieldSource, must be non-null valid * @throws ClassCastException if the object is invalid */ public int[] getPartialValues(ReadablePartial fieldSource, Object object, Chronology chrono) { ReadablePartial input = (ReadablePartial) object; int size = fieldSource.size(); int[] values = new int[size]; for (int i = 0; i < size; i++) { values[i] = input.get(fieldSource.getFieldType(i)); } chrono.validate(fieldSource, values); return values; } //----------------------------------------------------------------------- /** * Returns ReadableInstant.class. * * @return ReadableInstant.class */ public Class getSupportedType() { return ReadablePartial.class; } }





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