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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.XPathVariableResolver;
import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.collection.impl.CommonsHashMap;
import com.helger.commons.collection.impl.ICommonsMap;
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
* @see MapBasedXPathVariableResolver
*/
@NotThreadSafe
public class MapBasedXPathVariableResolverQName implements XPathVariableResolver, ICloneable
{
private final ICommonsMap m_aMap;
/**
* Default ctor.
*/
public MapBasedXPathVariableResolverQName ()
{
this ((Map ) null);
}
/**
* Ctor taking another map.
*
* @param aVars
* Variables to re-use. May be null.
*/
public MapBasedXPathVariableResolverQName (@Nullable final Map aVars)
{
m_aMap = new CommonsHashMap <> (aVars);
}
/**
* Copy constructor
*
* @param aOther
* Object to copy data from
*/
public MapBasedXPathVariableResolverQName (@Nonnull final MapBasedXPathVariableResolverQName aOther)
{
ValueEnforcer.notNull (aOther, "Other");
m_aMap = aOther.m_aMap.getClone ();
}
/**
* Add a new variable.
*
* @param aName
* The qualified name of the variable
* @param aValue
* The value to be used.
* @return {@link EChange}
*/
@Nonnull
public EChange addUniqueVariable (@Nonnull final QName aName, @Nonnull final Object aValue)
{
ValueEnforcer.notNull (aName, "Name");
ValueEnforcer.notNull (aValue, "Value");
if (m_aMap.containsKey (aName))
return EChange.UNCHANGED;
m_aMap.put (aName, aValue);
return EChange.CHANGED;
}
/**
* Add all variables from the other variable resolver into this resolver.
*
* @param aOther
* The variable resolver to import the variable from. May not be
* null.
* @param bOverwrite
* if true existing variables will be overwritten with the
* new variables, otherwise the old variables are kept.
* @return {@link EChange}
*/
@Nonnull
public EChange addAllFrom (@Nonnull final MapBasedXPathVariableResolverQName 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;
}
/**
* Add all variables from the other variable resolver into this resolver. This
* methods creates a QName with an empty namespace URI.
*
* @param aOther
* The variable resolver to import the variable from. May not be
* null.
* @param bOverwrite
* if true existing variables will be overwritten with the
* new variables, otherwise the old variables are kept.
* @return {@link EChange}
*/
@Nonnull
public EChange addAllFrom (@Nonnull final MapBasedXPathVariableResolver aOther, final boolean bOverwrite)
{
ValueEnforcer.notNull (aOther, "Other");
EChange eChange = EChange.UNCHANGED;
for (final Map.Entry aEntry : aOther.getAllVariables ().entrySet ())
{
// Local part only to QName
final QName aKey = new QName (aEntry.getKey ());
if (bOverwrite || !m_aMap.containsKey (aKey))
{
m_aMap.put (aKey, aEntry.getValue ());
eChange = EChange.CHANGED;
}
}
return eChange;
}
/**
* Remove the variable with the specified name.
*
* @param aName
* The name to be removed. May be null.
* @return {@link EChange}
*/
@Nonnull
public EChange removeVariable (@Nullable final QName aName)
{
if (aName == null)
return EChange.UNCHANGED;
return m_aMap.removeObject (aName);
}
/**
* Remove multiple variables at once.
*
* @param aNames
* The names to be removed. May be null.
* @return {@link EChange#CHANGED} if at least one variable was removed.
*/
@Nonnull
public EChange removeVariables (@Nullable final Iterable aNames)
{
EChange eChange = EChange.UNCHANGED;
if (aNames != null)
for (final QName aName : aNames)
eChange = eChange.or (removeVariable (aName));
return eChange;
}
/**
* @return A mutable copy of all contained variables. Never null
* but maybe empty.
*/
@Nonnull
@ReturnsMutableCopy
public ICommonsMap getAllVariables ()
{
return m_aMap.getClone ();
}
/**
* @return The number of contained variables. Always ≥ 0.
*/
@Nonnegative
public int getVariableCount ()
{
return m_aMap.size ();
}
/**
* Remove all variables at once.
*
* @return {@link EChange#CHANGED} if at least one variable was removed.
*/
@Nonnull
public EChange clear ()
{
return m_aMap.removeAll ();
}
/**
* Set multiple variables at once.
*
* @param aVars
* The variables to be set. May be null.
*/
public void setAllVariables (@Nullable final Map aVars)
{
m_aMap.setAll (aVars);
}
@Nullable
public Object resolveVariable (@Nonnull final QName aVariableName)
{
ValueEnforcer.notNull (aVariableName, "VariableName");
return m_aMap.get (aVariableName);
}
@Nonnull
@ReturnsMutableCopy
public MapBasedXPathVariableResolverQName getClone ()
{
return new MapBasedXPathVariableResolverQName (this);
}
@Override
public boolean equals (final Object o)
{
if (o == this)
return true;
if (o == null || !getClass ().equals (o.getClass ()))
return false;
final MapBasedXPathVariableResolverQName rhs = (MapBasedXPathVariableResolverQName) 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 ();
}
}