001: /*
002: * $Id: BaseSelectableBasedConstraint.java,v 1.15 2007/11/13 19:04:02 rwald Exp $
003: * =======================================================================
004: * Copyright (c) 2002-2004 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.constraints;
042:
043: import java.util.ArrayList;
044: import java.util.Iterator;
045: import java.util.List;
046:
047: import org.axiondb.AxionException;
048: import org.axiondb.Database;
049: import org.axiondb.RowDecorator;
050: import org.axiondb.RowIterator;
051: import org.axiondb.Selectable;
052: import org.axiondb.SelectableBasedConstraint;
053: import org.axiondb.Table;
054: import org.axiondb.TableIdentifier;
055: import org.axiondb.engine.visitors.ResolveSelectableVisitor;
056: import org.axiondb.event.RowEvent;
057:
058: /**
059: * Abstract base {@link SelectableBasedConstraint}implementation.
060: *
061: * @version $Revision: 1.15 $ $Date: 2007/11/13 19:04:02 $
062: * @author Rodney Waldhoff
063: * @author James Strachan
064: * @author Ahimanikya Satapathy
065: */
066: public abstract class BaseSelectableBasedConstraint extends
067: BaseConstraint implements SelectableBasedConstraint {
068: /**
069: * Creates a {@link org.axiondb.Constraint}with the given <i>name </i> and <i>type
070: * </i>.
071: *
072: * @param name the name of this constraint (see {@link #setName}) which may be
073: * <code>null</code>
074: * @param type the type of this constraint (see {@link #getType}), which should not
075: * be <code>null</code>
076: */
077: public BaseSelectableBasedConstraint(String name, String type) {
078: super (name, type);
079: _selectables = new ArrayList<Selectable>(2);
080: }
081:
082: public abstract boolean evaluate(RowEvent event)
083: throws AxionException;
084:
085: public abstract boolean evaluate(RowEvent event, RowDecorator dec)
086: throws AxionException;
087:
088: public abstract boolean evaluate(RowIterator oldRows,
089: RowIterator newRows, Table table) throws AxionException;
090:
091: public void addSelectable(Selectable sel) {
092: if (_resolved) {
093: throw new IllegalStateException(
094: "Can't add selectables after resolve");
095: }
096: _selectables.add(sel);
097: }
098:
099: public final int getSelectableCount() {
100: return _selectables.size();
101: }
102:
103: public final Selectable getSelectable(int i) {
104: return (Selectable) (_selectables.get(i));
105: }
106:
107: public final List getSelectableList() {
108: return _selectables;
109: }
110:
111: public final Iterator getSelectables() {
112: return getSelectableList().iterator();
113: }
114:
115: /**
116: * This base implementation {@link Database#resolveSelectable resolves}all of the
117: * {@link Selectable}s in my list.
118: */
119: public void resolve(Database db, TableIdentifier table)
120: throws AxionException {
121: if (!_resolved) {
122: TableIdentifier[] tables = toArray(table);
123: ResolveSelectableVisitor resolveSel = new ResolveSelectableVisitor(
124: db);
125: for (int i = 0, I = _selectables.size(); i < I; i++) {
126: _selectables
127: .set(i, resolveSel.visit(
128: (Selectable) _selectables.get(i), null,
129: tables));
130: }
131: _resolved = true;
132: }
133: }
134:
135: private List _selectables;
136: private boolean _resolved = false;
137: private static final long serialVersionUID = 3237990466073483444L;
138: }
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