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/*
 * 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.commons.lang3.exception;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;

/**
 * Default implementation of the context storing the label-value pairs for contexted exceptions.
 * 

* This implementation is serializable, however this is dependent on the values that * are added also being serializable. *

* * @see ContextedException * @see ContextedRuntimeException * @since 3.0 */ public class DefaultExceptionContext implements ExceptionContext, Serializable { /** The serialization version. */ private static final long serialVersionUID = 20110706L; /** The list storing the label-data pairs. */ private final List> contextValues = new ArrayList<>(); /** * {@inheritDoc} */ @Override public DefaultExceptionContext addContextValue(final String label, final Object value) { contextValues.add(new ImmutablePair<>(label, value)); return this; } /** * {@inheritDoc} */ @Override public DefaultExceptionContext setContextValue(final String label, final Object value) { for (final Iterator> iter = contextValues.iterator(); iter.hasNext();) { final Pair p = iter.next(); if (StringUtils.equals(label, p.getKey())) { iter.remove(); } } addContextValue(label, value); return this; } /** * {@inheritDoc} */ @Override public List getContextValues(final String label) { final List values = new ArrayList<>(); for (final Pair pair : contextValues) { if (StringUtils.equals(label, pair.getKey())) { values.add(pair.getValue()); } } return values; } /** * {@inheritDoc} */ @Override public Object getFirstContextValue(final String label) { for (final Pair pair : contextValues) { if (StringUtils.equals(label, pair.getKey())) { return pair.getValue(); } } return null; } /** * {@inheritDoc} */ @Override public Set getContextLabels() { final Set labels = new HashSet<>(); for (final Pair pair : contextValues) { labels.add(pair.getKey()); } return labels; } /** * {@inheritDoc} */ @Override public List> getContextEntries() { return contextValues; } /** * Builds the message containing the contextual information. * * @param baseMessage the base exception message without context information appended * @return the exception message with context information appended, never null */ @Override public String getFormattedExceptionMessage(final String baseMessage){ final StringBuilder buffer = new StringBuilder(256); if (baseMessage != null) { buffer.append(baseMessage); } if (!contextValues.isEmpty()) { if (buffer.length() > 0) { buffer.append('\n'); } buffer.append("Exception Context:\n"); int i = 0; for (final Pair pair : contextValues) { buffer.append("\t["); buffer.append(++i); buffer.append(':'); buffer.append(pair.getKey()); buffer.append("="); final Object value = pair.getValue(); if (value == null) { buffer.append("null"); } else { String valueStr; try { valueStr = value.toString(); } catch (final Exception e) { valueStr = "Exception thrown on toString(): " + ExceptionUtils.getStackTrace(e); } buffer.append(valueStr); } buffer.append("]\n"); } buffer.append("---------------------------------"); } return buffer.toString(); } }