| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license |
| * agreements. See the NOTICE file distributed with this work for additional information regarding |
| * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.cache.query.internal; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Set; |
| |
| import it.unimi.dsi.fastutil.objects.AbstractObjectIterator; |
| import it.unimi.dsi.fastutil.objects.ObjectIterator; |
| import it.unimi.dsi.fastutil.objects.ObjectOpenCustomHashSet; |
| |
| import org.apache.geode.DataSerializer; |
| import org.apache.geode.cache.query.SelectResults; |
| import org.apache.geode.cache.query.Struct; |
| import org.apache.geode.cache.query.internal.types.CollectionTypeImpl; |
| import org.apache.geode.cache.query.internal.types.StructTypeImpl; |
| import org.apache.geode.cache.query.types.CollectionType; |
| import org.apache.geode.cache.query.types.ObjectType; |
| import org.apache.geode.cache.query.types.StructType; |
| import org.apache.geode.internal.DataSerializableFixedID; |
| import org.apache.geode.internal.Version; |
| |
| /** |
| * A Set constrained to contain Structs of all the same type. To conserve on objects, we store the |
| * StructType once and reuse it to generate Struct instances on demand. |
| * |
| * The values in this set are stored as Object[] and get wrapped in Structs as necessary. |
| * |
| * @since GemFire 4.0 |
| */ |
| public class StructSet /* extends ObjectOpenCustomHashSet */ implements Set, SelectResults, |
| DataSerializableFixedID, StructFields { |
| private static final long serialVersionUID = -1228835506930611510L; |
| |
| protected StructType structType; |
| /** |
| * Holds value of property modifiable. |
| */ |
| private boolean modifiable = true; |
| /** |
| * Holds the actual contents of the StructSet |
| */ |
| private ObjectOpenCustomHashSet contents; |
| |
| /** |
| * Empty constructor to satisfy <code>DataSerializer</code> requirements |
| */ |
| public StructSet() {} |
| |
| /** |
| * This implementation uses Arrays.equals(Object[]) as it hashing strategy. |
| */ |
| protected static class ObjectArrayHashingStrategy implements ObjectOpenCustomHashSet.Strategy { |
| private static final long serialVersionUID = -6407549977968716071L; |
| |
| @Override |
| public int hashCode(Object o) { |
| // throws ClassCastException if not Object[] |
| // compute hash code based on all elements |
| Object[] oa = (Object[]) o; |
| int h = 0; |
| for (int i = 0; i < oa.length; i++) { |
| Object obj = oa[i]; |
| if (obj != null) |
| h += obj.hashCode(); |
| } |
| return h; |
| } |
| |
| @Override |
| public boolean equals(Object o1, Object o2) { |
| // throws ClassCastException if not Object[] |
| if (o1 == null) |
| return o2 == null; |
| if (!(o1 instanceof Object[]) || !(o2 instanceof Object[])) { |
| return o1.equals(o2); |
| } |
| return Arrays.equals((Object[]) o1, (Object[]) o2); |
| } |
| } |
| |
| /** Creates a new instance of StructSet */ |
| public StructSet(StructType structType) { |
| this.contents = new ObjectOpenCustomHashSet(new ObjectArrayHashingStrategy()); |
| if (structType == null) { |
| throw new IllegalArgumentException( |
| "structType must not be null"); |
| } |
| this.structType = structType; |
| } |
| |
| /** takes collection of Object[] fieldValues *or* another StructSet */ |
| public StructSet(Collection c, StructType structType) { |
| this.contents = new ObjectOpenCustomHashSet(c, new ObjectArrayHashingStrategy()); |
| if (structType == null) { |
| throw new IllegalArgumentException( |
| "structType must not be null"); |
| } |
| this.structType = structType; |
| } |
| |
| /** |
| * Creates a StructSet directly from a StructBag; (internal use) |
| * |
| * @since GemFire 5.1 |
| */ |
| StructSet(StructBag bag) { |
| this.contents = new ObjectOpenCustomHashSet(new ObjectArrayHashingStrategy()); |
| this.structType = (StructType) bag.elementType; |
| if (bag.hasLimitIterator) { |
| // Asif: Since the number of unique keys which |
| // will be returned by Bag with limit in place |
| // cannot be more than the size of the bag ( i.e |
| // the limit) , we can safely assume HashMap size |
| // to equal to bag's size |
| Iterator itr = bag.fieldValuesIterator(); |
| while (itr.hasNext()) { |
| addFieldValues((Object[]) itr.next()); |
| } |
| } else { |
| Set keys = bag.map.keySet(); |
| for (Object key : keys) { |
| addFieldValues((Object[]) key); |
| } |
| } |
| } |
| |
| |
| public StructSet(int initialCapacity, StructType structType) { |
| this.contents = new ObjectOpenCustomHashSet(initialCapacity, new ObjectArrayHashingStrategy()); |
| if (structType == null) { |
| throw new IllegalArgumentException( |
| "structType must not be null"); |
| } |
| this.structType = structType; |
| } |
| |
| public StructSet(int initialCapacity, float loadFactor, StructType structType) { |
| this.contents = |
| new ObjectOpenCustomHashSet(initialCapacity, loadFactor, new ObjectArrayHashingStrategy()); |
| if (structType == null) { |
| throw new IllegalArgumentException( |
| "structType must not be null"); |
| } |
| this.structType = structType; |
| } |
| |
| |
| @Override |
| public boolean equals(Object other) { |
| if (!(other instanceof StructSet)) { |
| return false; |
| } |
| if (!this.structType.equals(((StructSet) other).structType)) { |
| return false; |
| } |
| if (other.getClass() == StructSet.class) { |
| return this.contents.equals(((StructSet) other).contents); |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| return this.structType.hashCode(); |
| } |
| |
| |
| /** Add a Struct */ |
| @Override |
| public boolean add(Object obj) { |
| if (!(obj instanceof StructImpl)) { |
| throw new IllegalArgumentException( |
| "This set only accepts StructImpl"); |
| } |
| StructImpl s = (StructImpl) obj; |
| if (!s.getStructType().equals(this.structType)) { |
| throw new IllegalArgumentException( |
| String.format("obj does not have the same StructType: required: %s , actual: %s", |
| new Object[] {this.structType, s.getStructType()})); |
| } |
| return addFieldValues(s.getFieldValues()); |
| } |
| |
| /** |
| * For internal use. Just add the Object[] values for a struct with same type |
| */ |
| @Override |
| public boolean addFieldValues(Object[] fieldValues) { |
| return this.contents.add(fieldValues); |
| } |
| |
| /** Does this set contain specified struct? */ |
| @Override |
| public boolean contains(Object obj) { |
| if (!(obj instanceof Struct)) { |
| return false; |
| } |
| Struct s = (Struct) obj; |
| if (!this.structType.equals(StructTypeImpl.typeFromStruct(s))) { |
| return false; |
| } |
| return containsFieldValues(s.getFieldValues()); |
| } |
| |
| /** |
| * Does this set contain a Struct of the correct type with the specified values? |
| */ |
| @Override |
| public boolean containsFieldValues(Object[] fieldValues) { |
| return this.contents.contains(fieldValues); |
| } |
| |
| /** Remove the specified Struct */ |
| public boolean removeEntry(Object o) { |
| if (!(o instanceof Struct)) { |
| return false; |
| } |
| Struct s = (Struct) o; |
| if (!this.structType.equals(StructTypeImpl.typeFromStruct(s))) { |
| return false; |
| } |
| return removeFieldValues(s.getFieldValues()); |
| } |
| |
| /** Remove the field values from a struct of the correct type */ |
| @Override |
| public boolean removeFieldValues(Object[] fieldValues) { |
| return this.contents.remove(fieldValues); |
| } |
| |
| // downcast StructSets to call more efficient methods |
| @Override |
| public boolean addAll(Collection c) { |
| if (c instanceof StructSet) { |
| return addAll((StructSet) c); |
| } else { |
| boolean modified = false; |
| for (Object o : c) { |
| modified |= add(o); |
| } |
| return modified; |
| } |
| } |
| |
| @Override |
| public boolean removeAll(Collection c) { |
| if (c instanceof StructSet) { |
| return removeAll((StructSet) c); |
| } else { |
| boolean modified = false; |
| for (Object o : c) { |
| modified |= remove(o); |
| } |
| return modified; |
| } |
| } |
| |
| @Override |
| public boolean retainAll(Collection c) { |
| if (c instanceof StructSet) { |
| return retainAll((StructSet) c); |
| } |
| return this.contents.retainAll(c); |
| } |
| |
| public boolean addAll(StructSet ss) { |
| boolean modified = false; |
| if (!this.structType.equals(ss.structType)) { |
| throw new IllegalArgumentException( |
| "types do not match"); |
| } |
| for (Iterator itr = ss.fieldValuesIterator(); itr.hasNext();) { |
| Object[] vals = (Object[]) itr.next(); |
| if (this.contents.add(vals)) { |
| modified = true; |
| } |
| } |
| return modified; |
| } |
| |
| public boolean removeAll(StructSet ss) { |
| boolean modified = false; |
| if (!this.structType.equals(ss.structType)) { |
| return false; // nothing |
| // modified |
| } |
| for (Iterator itr = ss.fieldValuesIterator(); itr.hasNext();) { |
| Object[] vals = (Object[]) itr.next(); |
| if (this.contents.remove(vals)) { |
| modified = true; |
| } |
| } |
| return modified; |
| } |
| |
| public boolean retainAll(StructSet ss) { |
| if (!this.structType.equals(ss.structType)) { |
| if (isEmpty()) { |
| return false; // nothing modified |
| } else { |
| clear(); |
| return true; // nothing retained in receiver collection |
| } |
| } |
| boolean changed = false; |
| int size = size(); |
| Iterator it; |
| it = fieldValuesIterator(); |
| while (size-- > 0) { |
| Object[] vals = (Object[]) it.next(); |
| if (!ss.containsFieldValues(vals)) { |
| it.remove(); |
| changed = true; |
| } |
| } |
| return changed; |
| } |
| |
| /** Returns an Iterator over the Structs in this set */ |
| @Override |
| public ObjectIterator iterator() { |
| return new StructIterator(fieldValuesIterator()); |
| } |
| |
| /** Returns an iterator over the fieldValues Object[] instances */ |
| @Override |
| public Iterator fieldValuesIterator() { |
| return this.contents.iterator(); |
| } |
| |
| @Override |
| public CollectionType getCollectionType() { |
| return new CollectionTypeImpl(StructSet.class, this.structType); |
| } |
| |
| // note: this method is dangerous in that it could result in undefined |
| // behavior if the new struct type is not compatible with the data. |
| // For now just trust that the application knows what it is doing if it |
| // is overriding the element type in a set of structs |
| @Override |
| public void setElementType(ObjectType elementType) { |
| if (!(elementType instanceof StructTypeImpl)) { |
| throw new IllegalArgumentException( |
| "element type must be struct"); |
| } |
| this.structType = (StructType) elementType; |
| } |
| |
| @Override |
| public List asList() { |
| return new ArrayList(this); |
| } |
| |
| @Override |
| public Set asSet() { |
| return this; |
| } |
| |
| /** |
| * Getter for property modifiable. |
| * |
| * @return Value of property modifiable. |
| */ |
| @Override |
| public boolean isModifiable() { |
| return this.modifiable; |
| } |
| |
| @Override |
| public int occurrences(Object element) { |
| return contains(element) ? 1 : 0; |
| } |
| |
| /** |
| * Setter for property modifiable. |
| * |
| * @param modifiable New value of property modifiable. |
| */ |
| public void setModifiable(boolean modifiable) { |
| this.modifiable = modifiable; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuffer buf = new StringBuffer(); |
| buf.append("["); |
| Iterator i = iterator(); |
| boolean hasNext = i.hasNext(); |
| while (hasNext) { |
| Object o = i.next(); |
| buf.append(o == this ? "(this Collection)" : String.valueOf(o)); |
| hasNext = i.hasNext(); |
| if (hasNext) |
| buf.append(", "); |
| } |
| buf.append("]"); |
| return buf.toString(); |
| } |
| |
| /** |
| * Iterator wrapper to construct Structs on demand. |
| */ |
| private class StructIterator extends AbstractObjectIterator { |
| |
| private final Iterator itr; |
| |
| /** |
| * @param itr iterator over the Object[] instances of fieldValues |
| */ |
| StructIterator(Iterator itr) { |
| this.itr = itr; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return this.itr.hasNext(); |
| } |
| |
| @Override |
| public Object next() { |
| return new StructImpl((StructTypeImpl) StructSet.this.structType, (Object[]) this.itr.next()); |
| } |
| |
| @Override |
| public void remove() { |
| this.itr.remove(); |
| } |
| |
| } |
| |
| @Override |
| public int getDSFID() { |
| return STRUCT_SET; |
| } |
| |
| @Override |
| public void fromData(DataInput in) throws IOException, ClassNotFoundException { |
| this.contents = new ObjectOpenCustomHashSet(new ObjectArrayHashingStrategy()); |
| int size = in.readInt(); |
| this.structType = (StructTypeImpl) DataSerializer.readObject(in); |
| for (int j = size; j > 0; j--) { |
| this.add(DataSerializer.readObject(in)); |
| } |
| } |
| |
| @Override |
| public void toData(DataOutput out) throws IOException { |
| out.writeInt(this.size()); |
| DataSerializer.writeObject(this.structType, out); |
| for (Iterator i = this.iterator(); i.hasNext();) { |
| DataSerializer.writeObject(i.next(), out); |
| } |
| } |
| |
| @Override |
| public Version[] getSerializationVersions() { |
| return null; |
| } |
| |
| @Override |
| public int size() { |
| return this.contents.size(); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return this.contents.isEmpty(); |
| } |
| |
| @Override |
| public Object[] toArray() { |
| Struct[] structs = new Struct[this.contents.size()]; |
| int i = 0; |
| for (Iterator iter = this.iterator(); iter.hasNext();) { |
| structs[i++] = (Struct) iter.next(); |
| } |
| return structs; |
| } |
| |
| @Override |
| public Object[] toArray(Object[] a) { |
| Object[] array = this.contents.toArray(a); |
| int i = 0; |
| for (Object o : array) { |
| array[i++] = new StructImpl((StructTypeImpl) this.structType, (Object[]) o); |
| } |
| return array; |
| } |
| |
| @Override |
| public boolean remove(Object o) { |
| if (o instanceof Struct) { |
| o = ((Struct) o).getFieldValues(); |
| } |
| return this.contents.remove(o); |
| } |
| |
| @Override |
| public boolean containsAll(Collection c) { |
| // TODO: Asif : This is wrong ,we need to fix this. |
| return this.contents.containsAll(c); |
| } |
| |
| @Override |
| public void clear() { |
| this.contents.clear(); |
| } |
| |
| } |