/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.sql.lang;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.TreeMap;
import org.teiid.core.util.EquivalenceUtil;
import org.teiid.core.util.StringUtil;
public class SourceHint {
public static class SpecificHint {
LinkedHashSet<String> hints = new LinkedHashSet<String>();
boolean useAliases;
public SpecificHint(String hint, boolean useAliases) {
this.hints.add(hint);
this.useAliases = useAliases;
}
public String getHint() {
return StringUtil.join(hints, " ");
}
public boolean isUseAliases() {
return useAliases;
}
public Collection<String> getHints() {
return hints;
}
}
private boolean useAliases;
private LinkedHashSet<String> generalHint;
private Map<String, SpecificHint> sourceHints;
public String getGeneralHint() {
if (generalHint == null) {
return null;
}
return StringUtil.join(generalHint, " ");
}
public void setGeneralHint(String generalHint) {
if (this.generalHint == null) {
this.generalHint = new LinkedHashSet<String>();
}
this.generalHint.add(generalHint);
}
public void setSourceHint(String sourceName, String hint, boolean useAliases) {
if (this.sourceHints == null) {
this.sourceHints = new TreeMap<String, SpecificHint>(String.CASE_INSENSITIVE_ORDER);
}
SpecificHint sh = this.sourceHints.get(sourceName);
if (sh == null) {
this.sourceHints.put(sourceName, new SpecificHint(hint, useAliases));
} else {
sh.useAliases |= useAliases;
sh.hints.add(hint);
}
}
public SpecificHint getSpecificHint(String sourceName) {
if (this.sourceHints == null) {
return null;
}
return this.sourceHints.get(sourceName);
}
public String getSourceHint(String sourceName) {
SpecificHint sp = getSpecificHint(sourceName);
if (sp != null) {
return sp.getHint();
}
return null;
}
public Map<String, SpecificHint> getSpecificHints() {
return sourceHints;
}
public boolean isUseAliases() {
return useAliases;
}
public void setUseAliases(boolean useAliases) {
this.useAliases |= useAliases;
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof SourceHint)) {
return false;
}
SourceHint other = (SourceHint)obj;
return EquivalenceUtil.areEqual(generalHint, other.generalHint)
&& EquivalenceUtil.areEqual(this.sourceHints, other.sourceHints);
}
public static SourceHint combine(SourceHint sourceHint,
SourceHint sourceHint2) {
if (sourceHint == null) {
if (sourceHint2 == null) {
return null;
}
return sourceHint2;
} else if (sourceHint2 == null) {
return sourceHint;
}
SourceHint newHint = new SourceHint();
addHints(sourceHint, newHint);
addHints(sourceHint2, newHint);
return newHint;
}
private static void addHints(SourceHint sourceHint,
SourceHint newHint) {
if (sourceHint.sourceHints != null) {
for (Map.Entry<String, SpecificHint> entry : sourceHint.sourceHints.entrySet()) {
for (String hint : entry.getValue().hints) {
newHint.setSourceHint(entry.getKey(), hint, entry.getValue().useAliases);
}
}
}
newHint.setUseAliases(sourceHint.isUseAliases());
if (sourceHint.generalHint != null) {
if (newHint.generalHint == null) {
newHint.generalHint = new LinkedHashSet<String>();
}
newHint.generalHint.addAll(sourceHint.generalHint);
}
}
public Collection<String> getGeneralHints() {
return generalHint;
}
}