001: /*
002: * $Id: Base64EncodeFunction.java,v 1.3 2005/03/04 09:09:18 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2003 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.functions;
042:
043: import java.io.ByteArrayOutputStream;
044: import java.io.IOException;
045: import java.io.InputStream;
046: import java.sql.Blob;
047: import java.sql.SQLException;
048:
049: import org.apache.commons.codec.binary.Base64;
050: import org.axiondb.AxionException;
051: import org.axiondb.DataType;
052: import org.axiondb.FunctionFactory;
053: import org.axiondb.RowDecorator;
054: import org.axiondb.Selectable;
055: import org.axiondb.types.StringType;
056:
057: /**
058: * <tt>BASE64ENCODE(byte[])</tt>: returns a string representing the Base64 encoded
059: * value of the given <i>byte[] </i> or Blob.
060: *
061: * @version $Revision: 1.3 $ $Date: 2005/03/04 09:09:18 $
062: * @author Rodney Waldhoff
063: */
064: public class Base64EncodeFunction extends BaseFunction implements
065: ScalarFunction, FunctionFactory {
066: public Base64EncodeFunction() {
067: super ("BASE64ENCODE");
068: }
069:
070: public ConcreteFunction makeNewInstance() {
071: return new Base64EncodeFunction();
072: }
073:
074: public DataType getDataType() {
075: return RETURN_TYPE;
076: }
077:
078: public Object evaluate(RowDecorator row) throws AxionException {
079: Selectable sel = getArgument(0);
080: Object val = sel.evaluate(row);
081: if (val instanceof byte[]) {
082: return new String(Base64.encodeBase64((byte[]) val));
083: } else if (null == val) {
084: return null;
085: } else {
086: try {
087: val = sel.getDataType().toBlob(val);
088: return new String(Base64
089: .encodeBase64(readBlob((Blob) val)));
090: } catch (SQLException e) {
091: throw new AxionException(e);
092: } catch (IOException e) {
093: throw new AxionException(e);
094: }
095: }
096: }
097:
098: public boolean isValid() {
099: return getArgumentCount() == 1;
100: }
101:
102: private byte[] readBlob(Blob blob) throws IOException, SQLException {
103: ByteArrayOutputStream buf = new ByteArrayOutputStream();
104: InputStream in = null;
105: try {
106: in = blob.getBinaryStream();
107: for (int b = in.read(); b != -1; b = in.read()) {
108: buf.write((byte) b);
109: }
110: } finally {
111: try {
112: in.close();
113: } catch (Exception e) {
114: }
115: }
116: return buf.toByteArray();
117: }
118:
119: private static final DataType RETURN_TYPE = new StringType();
120: }
|