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    • org.apache.commons.lang3.exception.DefaultExceptionContext Maven / Gradle / Ivy

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    Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported LTS releases: 8, 11, 17 and 21 currently. See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml Please ensure your build environment is up-to-date and kindly report any build issues.

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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.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

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 List> getContextEntries() {
        return contextValues;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Set getContextLabels() {
        return stream().map(Pair::getKey).collect(Collectors.toSet());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public List getContextValues(final String label) {
        return stream().filter(pair -> StringUtils.equals(label, pair.getKey())).map(Pair::getValue).collect(Collectors.toList());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Object getFirstContextValue(final String label) {
        return stream().filter(pair -> StringUtils.equals(label, pair.getKey())).findFirst().map(Pair::getValue).orElse(null);
    }

    /**
     * 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();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public DefaultExceptionContext setContextValue(final String label, final Object value) {
        contextValues.removeIf(p -> StringUtils.equals(label, p.getKey()));
        addContextValue(label, value);
        return this;
    }

    private Stream> stream() {
        return contextValues.stream();
    }

}
    
    
    
    

    




    
    
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