org.openmdx.base.accessor.rest.KeySet Maven / Gradle / Ivy
/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: KeySet
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2018, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.base.accessor.rest;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;
import org.openmdx.base.accessor.cci.Container_1_0;
import org.openmdx.base.accessor.cci.DataObject_1_0;
/**
* Key Set
*/
class KeySet extends AbstractSet {
/**
* Constructor
*
* @param delegate
*/
KeySet(
Container_1_0 delegate
) {
this.delegate = delegate;
}
/**
* The delegate
*/
private final Container_1_0 delegate;
/* (non-Javadoc)
* @see java.util.AbstractCollection#iterator()
*/
@Override
public Iterator iterator() {
return new KeyIterator(
this.delegate.entrySet().iterator()
);
}
/* (non-Javadoc)
* @see java.util.AbstractCollection#size()
*/
@Override
public int size() {
return this.delegate.size();
}
/* (non-Javadoc)
* @see java.util.AbstractCollection#contains(java.lang.Object)
*/
@Override
public boolean contains(Object o) {
return this.delegate.containsKey(o);
}
/* (non-Javadoc)
* @see java.util.AbstractCollection#isEmpty()
*/
@Override
public boolean isEmpty() {
return this.delegate.isEmpty();
}
/**
* Break the List contract to avoid round-trips
*/
@Override
public boolean equals(
Object that
) {
return this == that;
}
/**
* Break the List contract to avoid round-trips
*/
@Override
public int hashCode() {
return System.identityHashCode(this);
}
/**
* Break the List contract to avoid round-trips
*/
@Override
public String toString(
){
return this.getClass().getSimpleName() + " of " + this.delegate;
}
//--------------------------------------------------------------------
// Class KeyIterator
//--------------------------------------------------------------------
/**
* Key Iterator
*/
private static class KeyIterator implements Iterator {
/**
* Constructor
*
* @param delegate
*/
KeyIterator(
Iterator> delegate
){
this.delegate = delegate;
}
/**
* An entry set iterator
*/
private final Iterator> delegate;
/* (non-Javadoc)
* @see java.util.Iterator#hasNext()
*/
@Override
public boolean hasNext() {
return this.delegate.hasNext();
}
/* (non-Javadoc)
* @see java.util.Iterator#next()
*/
@Override
public String next() {
return this.delegate.next().getKey();
}
/* (non-Javadoc)
* @see java.util.Iterator#remove()
*/
@Override
public void remove() {
this.delegate.remove();
}
}
}