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Java 1.8+ Library with XML handling routines
/*
* Copyright (C) 2014-2023 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* 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 com.helger.xml.xpath;
import java.util.Map;
import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.NotThreadSafe;
import javax.xml.namespace.QName;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionResolver;
import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.impl.CommonsLinkedHashMap;
import com.helger.commons.collection.impl.ICommonsOrderedMap;
import com.helger.commons.equals.EqualsHelper;
import com.helger.commons.hashcode.HashCodeGenerator;
import com.helger.commons.lang.ICloneable;
import com.helger.commons.state.EChange;
import com.helger.commons.string.ToStringGenerator;
/**
* Class is used in conjunction with {@link javax.xml.xpath.XPathExpression} to
* resolve variable values used in XPath queries at runtime. The whole QName is
* used as the key in the map. The namespace is not-ignored in this class.
*
* @author Philip Helger
*/
@NotThreadSafe
public class MapBasedXPathFunctionResolver implements XPathFunctionResolver, ICloneable
{
private final ICommonsOrderedMap m_aMap;
/**
* Default ctor.
*/
public MapBasedXPathFunctionResolver ()
{
m_aMap = new CommonsLinkedHashMap <> ();
}
/**
* Copy constructor
*
* @param aOther
* Object to copy data from
*/
public MapBasedXPathFunctionResolver (@Nonnull final MapBasedXPathFunctionResolver aOther)
{
ValueEnforcer.notNull (aOther, "Other");
m_aMap = aOther.m_aMap.getClone ();
}
/**
* Add a new function.
*
* @param sNamespaceURI
* The namespace URI of the function
* @param sLocalPart
* The local part of the function
* @param nArity
* The number of parameters of the function
* @param aFunction
* The function to be used. May not be null.
* @return {@link EChange}
*/
@Nonnull
public EChange addUniqueFunction (@Nonnull final String sNamespaceURI,
@Nonnull final String sLocalPart,
@Nonnegative final int nArity,
@Nonnull final XPathFunction aFunction)
{
return addUniqueFunction (new QName (sNamespaceURI, sLocalPart), nArity, aFunction);
}
/**
* Add a new function.
*
* @param aName
* The qualified name of the function
* @param nArity
* The number of parameters of the function
* @param aFunction
* The function to be used. May not be null.
* @return {@link EChange}
*/
@Nonnull
public EChange addUniqueFunction (@Nonnull final QName aName, @Nonnegative final int nArity, @Nonnull final XPathFunction aFunction)
{
ValueEnforcer.notNull (aFunction, "Function");
final XPathFunctionKey aFunctionKey = new XPathFunctionKey (aName, nArity);
if (m_aMap.containsKey (aFunctionKey))
return EChange.UNCHANGED;
m_aMap.put (aFunctionKey, aFunction);
return EChange.CHANGED;
}
/**
* Add all functions from the other function resolver into this resolver.
*
* @param aOther
* The function resolver to import the functions from. May not be
* null.
* @param bOverwrite
* if true existing functions will be overwritten with the
* new functions, otherwise the old functions are kept.
* @return {@link EChange}
*/
@Nonnull
public EChange addAllFrom (@Nonnull final MapBasedXPathFunctionResolver aOther, final boolean bOverwrite)
{
ValueEnforcer.notNull (aOther, "Other");
EChange eChange = EChange.UNCHANGED;
for (final Map.Entry aEntry : aOther.m_aMap.entrySet ())
if (bOverwrite || !m_aMap.containsKey (aEntry.getKey ()))
{
m_aMap.put (aEntry.getKey (), aEntry.getValue ());
eChange = EChange.CHANGED;
}
return eChange;
}
/**
* Remove the function with the specified name.
*
* @param aName
* The name to be removed. May not be null.
* @param nArity
* The number of parameters of the function. Must be ≥ 0.
* @return {@link EChange}
*/
@Nonnull
public EChange removeFunction (@Nonnull final QName aName, @Nonnegative final int nArity)
{
final XPathFunctionKey aKey = new XPathFunctionKey (aName, nArity);
return removeFunction (aKey);
}
/**
* Remove the function with the specified name.
*
* @param aKey
* The function key to be removed. May be null.
* @return {@link EChange}
*/
@Nonnull
public EChange removeFunction (@Nullable final XPathFunctionKey aKey)
{
if (aKey == null)
return EChange.UNCHANGED;
return m_aMap.removeObject (aKey);
}
/**
* Remove all functions with the same name. This can be helpful when the same
* function is registered for multiple parameters.
*
* @param aName
* The name to be removed. May be null.
* @return {@link EChange#CHANGED} if at least one function was removed.
*/
@Nonnull
public EChange removeFunctionsWithName (@Nullable final QName aName)
{
EChange eChange = EChange.UNCHANGED;
if (aName != null)
{
// Make a copy of the key set to allow for inline modification
for (final XPathFunctionKey aKey : m_aMap.copyOfKeySet ())
if (aKey.getFunctionName ().equals (aName))
eChange = eChange.or (removeFunction (aKey));
}
return eChange;
}
/**
* @return A mutable copy of all contained functions. Never null
* but maybe empty.
*/
@Nonnull
@ReturnsMutableCopy
public ICommonsOrderedMap getAllFunctions ()
{
return m_aMap.getClone ();
}
/**
* @return The number of contained functions. Always ≥ 0.
*/
@Nonnegative
public int getFunctionCount ()
{
return m_aMap.size ();
}
/**
* Remove all functions at once.
*
* @return {@link EChange#CHANGED} if at least one function was removed.
*/
@Nonnull
public EChange clear ()
{
return m_aMap.removeAll ();
}
@Nullable
public XPathFunction resolveFunction (@Nonnull final QName aFunctionName, @Nonnegative final int nArity)
{
return resolveFunction (new XPathFunctionKey (aFunctionName, nArity));
}
@Nullable
public XPathFunction resolveFunction (@Nullable final XPathFunctionKey aFunctionKey)
{
return m_aMap.get (aFunctionKey);
}
@Nonnull
@ReturnsMutableCopy
public MapBasedXPathFunctionResolver getClone ()
{
return new MapBasedXPathFunctionResolver (this);
}
@Override
public boolean equals (final Object o)
{
if (o == this)
return true;
if (o == null || !getClass ().equals (o.getClass ()))
return false;
final MapBasedXPathFunctionResolver rhs = (MapBasedXPathFunctionResolver) o;
return EqualsHelper.equals (m_aMap, rhs.m_aMap);
}
@Override
public int hashCode ()
{
return new HashCodeGenerator (this).append (m_aMap).getHashCode ();
}
@Override
public String toString ()
{
return new ToStringGenerator (this).append ("map", m_aMap).getToString ();
}
}