001: /*
002: * $Id: BaseFunction.java,v 1.11 2005/12/20 18:32:28 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.functions;
042:
043: import java.util.ArrayList;
044: import java.util.Iterator;
045: import java.util.List;
046:
047: import org.axiondb.BaseSelectable;
048: import org.axiondb.DataType;
049: import org.axiondb.Selectable;
050: import org.axiondb.VariableContext;
051:
052: /**
053: * An abstract base {@link ConcreteFunction}implementation.
054: *
055: * @version $Revision: 1.11 $ $Date: 2005/12/20 18:32:28 $
056: * @author Rodney Waldhoff
057: * @author Chuck Burdick
058: * @author Ahimanikya Satapathy
059: */
060: public abstract class BaseFunction extends BaseSelectable implements
061: ConcreteFunction {
062:
063: public BaseFunction(String name) {
064: setName(name);
065: }
066:
067: public BaseFunction(String name, List args) {
068: setName(name);
069: _args = args;
070: }
071:
072: public void addArgument(Selectable arg) {
073: _args.add(arg);
074: }
075:
076: public Selectable getArgument(int i) {
077: return (Selectable) (_args.get(i));
078: }
079:
080: public int getArgumentCount() {
081: return _args.size();
082: }
083:
084: public abstract DataType getDataType();
085:
086: public abstract boolean isValid();
087:
088: public void setArgument(int i, Selectable arg) {
089: _args.set(i, arg);
090: }
091:
092: public void setVariableContext(VariableContext context) {
093: for (Iterator iter = _args.iterator(); iter.hasNext();) {
094: Selectable sel = (Selectable) (iter.next());
095: if (null != sel) {
096: sel.setVariableContext(context);
097: }
098: }
099: }
100:
101: public String toString() {
102: StringBuffer buf = new StringBuffer();
103: buf.append(getName());
104: if (!_args.isEmpty()) {
105: buf.append("(");
106: for (Iterator iter = _args.iterator(); iter.hasNext();) {
107: buf.append(iter.next());
108: if (iter.hasNext()) {
109: buf.append(",");
110: }
111: }
112: buf.append(")");
113: }
114:
115: if (null != getAlias()) {
116: buf.append(" AS ");
117: buf.append(getAlias());
118: }
119: return buf.toString();
120: }
121:
122: private List _args = new ArrayList(2);
123: }
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