001: /*
002: * $Id: ShortType.java,v 1.10 2005/05/02 22:29:40 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2002-2005 Axion Development Team. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above
011: * copyright notice, this list of conditions and the following
012: * disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The names "Tigris", "Axion", nor the names of its contributors may
020: * not be used to endorse or promote products derived from this
021: * software without specific prior written permission.
022: *
023: * 4. Products derived from this software may not be called "Axion", nor
024: * may "Tigris" or "Axion" appear in their names without specific prior
025: * written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038: * =======================================================================
039: */
040:
041: package org.axiondb.types;
042:
043: import java.io.DataInput;
044: import java.io.DataOutput;
045: import java.io.IOException;
046: import java.math.BigDecimal;
047: import java.util.Comparator;
048:
049: import org.axiondb.AxionException;
050: import org.axiondb.DataType;
051:
052: /**
053: * A {@link DataType}representing a short value.
054: *
055: * @version $Revision: 1.10 $ $Date: 2005/05/02 22:29:40 $
056: * @author Rodney Waldhoff
057: * @author Jonathan Giron
058: */
059: public class ShortType extends BaseNumberDataType {
060:
061: public ShortType() {
062: }
063:
064: public int getJdbcType() {
065: return java.sql.Types.SMALLINT;
066: }
067:
068: public String getPreferredValueClassName() {
069: return "java.lang.Short";
070: }
071:
072: public int getPrecision() {
073: return String.valueOf(Short.MAX_VALUE).length();
074: }
075:
076: public int getColumnDisplaySize() {
077: return String.valueOf(Short.MIN_VALUE).length();
078: }
079:
080: public String toString() {
081: return "short";
082: }
083:
084: /**
085: * Returns an <tt>Short</tt> converted from the given <i>value </i>, or throws
086: * {@link IllegalArgumentException}if the given <i>value </i> isn't
087: * {@link #accepts acceptable}.
088: */
089: public Object convert(Object value) throws AxionException {
090: int rawValue = 0;
091:
092: if (value instanceof Short) {
093: return value;
094: } else if (value instanceof BigDecimal) {
095: rawValue = ((BigDecimal) value).intValue();
096: } else if (value instanceof Number) {
097: rawValue = ((Number) value).intValue();
098: } else if (value instanceof String) {
099: try {
100: rawValue = new BigDecimal(value.toString().trim())
101: .intValue();
102: } catch (NumberFormatException e) {
103: throw new AxionException(22018);
104: }
105: } else {
106: return super .convert(value);
107: }
108:
109: assertValueInRange(rawValue);
110: return new Short((short) rawValue);
111: }
112:
113: public Object successor(Object value)
114: throws IllegalArgumentException {
115: short v = ((Short) value).shortValue();
116: if (v == Short.MAX_VALUE) {
117: return value;
118: }
119: return new Short(++v);
120: }
121:
122: /**
123: * @see #write
124: */
125: public Object read(DataInput in) throws IOException {
126: short value = in.readShort();
127: if (Short.MIN_VALUE == value) {
128: if (!in.readBoolean()) {
129: return null;
130: }
131: }
132: return new Short(value);
133: }
134:
135: /**
136: * Writes the given <i>value </i> to the given <code>DataOutput</code>.
137: * <code>Null</code> values are written as <code>Short.MIN_VALUE</code>,
138: * <code>false</code>.<code>Short.MIN_VALUE</code> values are written as
139: * <code>Short.MIN_VALUE</code>,<code>true</code>. All other values are written
140: * directly.
141: *
142: * @param value the value to write, which must be {@link #accepts acceptable}
143: */
144: public void write(Object value, DataOutput out) throws IOException {
145: if (null == value) {
146: out.writeShort(Short.MIN_VALUE);
147: out.writeBoolean(false);
148: } else {
149: short val;
150: try {
151: val = ((Short) (convert(value))).shortValue();
152: out.writeShort(val);
153: if (Short.MIN_VALUE == val) {
154: out.writeBoolean(true);
155: }
156: } catch (AxionException e) {
157: throw new IOException(e.getMessage());
158: }
159: }
160: }
161:
162: public DataType makeNewInstance() {
163: return new ShortType();
164: }
165:
166: public int compare(Object a, Object b) {
167: short pa = ((Number) a).shortValue();
168: short pb = ((Number) b).shortValue();
169: return (pa < pb) ? -1 : ((pa == pb) ? 0 : 1);
170: }
171:
172: protected Comparator getComparator() {
173: return this ;
174: }
175:
176: private void assertValueInRange(int value) throws AxionException {
177: if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
178: throw new AxionException(22003);
179: }
180: }
181:
182: private static final long serialVersionUID = -8598189286242089718L;
183: }
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