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Internal ehcache-core module. This artifact is not meant to be used directly for jdk 1.5
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/**
* Copyright Terracotta, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.ehcache;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import net.sf.ehcache.search.Attribute;
import net.sf.ehcache.search.Direction;
import net.sf.ehcache.search.ExecutionHints;
import net.sf.ehcache.search.Query;
import net.sf.ehcache.search.Results;
import net.sf.ehcache.search.SearchException;
import net.sf.ehcache.search.aggregator.Aggregator;
import net.sf.ehcache.search.aggregator.AggregatorException;
import net.sf.ehcache.search.aggregator.AggregatorInstance;
import net.sf.ehcache.search.expression.AlwaysMatch;
import net.sf.ehcache.search.expression.Criteria;
import net.sf.ehcache.store.StoreQuery;
/**
* Query builder implementation. Instances are bound to a specific cache
*
* @author teck
*/
class CacheQuery implements Query, StoreQuery {
private volatile boolean frozen;
private volatile boolean includeKeys;
private volatile boolean includeValues;
private volatile int maxResults = -1;
private String[] targets;
private final List orderings = Collections.synchronizedList(new ArrayList());
private final Set> includedAttributes = Collections.synchronizedSet(new HashSet>());
private final List criteria = Collections.synchronizedList(new ArrayList());
private final List aggregators = Collections.synchronizedList(new ArrayList());
private final Set> groupByAttributes = Collections.synchronizedSet(new HashSet>());
private final Cache cache;
private volatile ExecutionHints hints;
/**
* Create a new builder instance
*
* @param cache
*/
public CacheQuery(Cache cache) {
this.cache = cache;
}
/**
* {@inheritDoc}
*/
public Query includeKeys() {
checkFrozen();
this.includeKeys = true;
return this;
}
/**
* {@inheritDoc}
*/
public Query includeValues() {
checkFrozen();
this.includeValues = true;
return this;
}
/**
* {@inheritDoc}
*/
public Query includeAttribute(Attribute... attributes) {
checkFrozen();
if (attributes == null) {
throw new NullPointerException();
}
for (Attribute attribute : attributes) {
if (attribute == null) {
throw new NullPointerException("null attribute");
}
this.includedAttributes.add(attribute);
}
return this;
}
/**
* {@inheritDoc}
*/
public Query includeAggregator(Aggregator... aggregators) throws SearchException, AggregatorException {
checkFrozen();
if (aggregators == null) {
throw new NullPointerException();
}
for (Aggregator aggregator : aggregators) {
if (aggregator == null) {
throw new NullPointerException("null aggregator");
}
this.aggregators.add(aggregator);
}
return this;
}
/**
* {@inheritDoc}
*/
public Query addOrderBy(Attribute attribute, Direction direction) {
checkFrozen();
this.orderings.add(new OrderingImpl(attribute, direction));
return this;
}
/**
* {@inheritDoc}
*/
public Query addGroupBy(Attribute... attributes) {
checkFrozen();
if (attributes == null) {
throw new NullPointerException();
}
for (Attribute attribute : attributes) {
if (attribute == null) {
throw new NullPointerException("null attribute");
}
groupByAttributes.add(attribute);
}
return this;
}
/**
* {@inheritDoc}
*/
public Query maxResults(int maxResults) {
checkFrozen();
this.maxResults = maxResults;
return this;
}
/**
* {@inheritDoc}
*/
public Query addCriteria(Criteria criteria) {
checkFrozen();
if (criteria == null) {
throw new NullPointerException("null criteria");
}
this.criteria.add(criteria);
return this;
}
/**
* {@inheritDoc}
*/
public Results execute() throws SearchException {
return cache.executeQuery(snapshot());
}
/**
* {@inheritDoc}
*/
public Results execute(ExecutionHints params) throws SearchException {
this.hints = params;
return cache.executeQuery(snapshot());
}
/**
* {@inheritDoc}
*/
public Query end() {
frozen = true;
return this;
}
/**
* {@inheritDoc}
*/
public List getOrdering() {
assertFrozen();
return Collections.unmodifiableList(orderings);
}
/**
* {@inheritDoc}
*/
public Criteria getCriteria() {
assertFrozen();
return getEffectiveCriteriaCopy();
}
/**
* {@inheritDoc}
*/
public boolean requestsKeys() {
assertFrozen();
return includeKeys;
}
/**
* {@inheritDoc}
*/
public boolean requestsValues() {
assertFrozen();
return includeValues;
}
/**
* {@inheritDoc}
*/
public Cache getCache() {
assertFrozen();
return cache;
}
/**
* {@inheritDoc}
*/
public Set> requestedAttributes() {
assertFrozen();
return Collections.unmodifiableSet(this.includedAttributes);
}
/**
* {@inheritDoc}
*/
public Set> groupByAttributes() {
assertFrozen();
return Collections.unmodifiableSet(this.groupByAttributes);
}
/**
* {@inheritDoc}
*/
public int maxResults() {
assertFrozen();
return maxResults;
}
/**
* {@inheritDoc}
*/
@Override
public ExecutionHints getExecutionHints() {
assertFrozen();
return hints;
}
/**
* {@inheritDoc}
*/
public List getAggregators() {
return Collections.unmodifiableList(this.aggregators);
}
/**
* {@inheritDoc}
*/
public List> getAggregatorInstances() {
assertFrozen();
return Collections.unmodifiableList(createAggregatorInstances(aggregators));
}
private static List> createAggregatorInstances(List aggregators) {
List> rv = new ArrayList>(aggregators.size());
for (Aggregator aggregator : aggregators) {
rv.add(aggregator.createInstance());
}
return rv;
}
private Criteria getEffectiveCriteriaCopy() {
Criteria result = new AlwaysMatch();
for (Criteria c : criteria) {
result = result.and(c);
}
return result;
}
private void assertFrozen() {
if (!frozen) {
throw new AssertionError("not frozen");
}
}
private StoreQuery snapshot() {
if (frozen) {
return this;
}
return new StoreQueryImpl();
}
private void checkFrozen() {
if (frozen) {
throw new SearchException("Query is frozen and cannot be mutated");
}
}
/**
* {@inheritDoc}
*/
public String[] getTargets() {
return this.targets;
}
/**
* {@inheritDoc}
*/
@Override
public void targets(final String[] targets) {
this.targets = targets;
}
/**
* StoreQuery implementation (essentially a snapshot of this (non-frozen) query builder
*/
private class StoreQueryImpl implements StoreQuery {
private final Criteria copiedCriteria = CacheQuery.this.getEffectiveCriteriaCopy();
private final boolean copiedIncludeKeys = includeKeys;
private final boolean copiedIncludeValues = includeValues;
private final Set> copiedAttributes = Collections.unmodifiableSet(new HashSet>(includedAttributes));
private final int copiedMaxResults = maxResults;
private final List copiedOrdering = Collections.unmodifiableList(new ArrayList(orderings));
private final List copiedAggregators = Collections.unmodifiableList(aggregators);
private final List> copiedAggregatorInstances = Collections.unmodifiableList(createAggregatorInstances(aggregators));
private final Set> copiedGroupByAttributes = Collections.unmodifiableSet(new HashSet>(groupByAttributes));
private final ExecutionHints execHints = hints;
public Criteria getCriteria() {
return copiedCriteria;
}
public boolean requestsKeys() {
return copiedIncludeKeys;
}
public boolean requestsValues() {
return copiedIncludeValues;
}
public Cache getCache() {
return cache;
}
public Set> requestedAttributes() {
return copiedAttributes;
}
public Set> groupByAttributes() {
return copiedGroupByAttributes;
}
public int maxResults() {
return copiedMaxResults;
}
public List getOrdering() {
return copiedOrdering;
}
public List getAggregators() {
return copiedAggregators;
}
public List> getAggregatorInstances() {
return copiedAggregatorInstances;
}
public String[] getTargets() {
return targets;
}
/**
* {@inheritDoc}
*/
public void targets(String[] targets) {
CacheQuery.this.targets = targets;
}
public ExecutionHints getExecutionHints() {
return execHints;
}
}
/**
* An attribute/direction pair
*/
private static class OrderingImpl implements Ordering {
private final Attribute attribute;
private final Direction direction;
public OrderingImpl(Attribute attribute, Direction direction) {
if ((attribute == null) || (direction == null)) {
throw new NullPointerException();
}
this.attribute = attribute;
this.direction = direction;
}
public Attribute getAttribute() {
return attribute;
}
public Direction getDirection() {
return direction;
}
}
}